• hace 2 horas
We picked up this Series 8 Mazda RX7 in Japan and road tripped it back to Hiroshima, met some of the engineers from the project and generally had an excellent time - BUT it never worked properly. In the first video of this series we dive into fixing and modifying one of the coolest looking JDM sports cars ever made.

Check out Turbos and Temples 3 here: https://www.youtube.com/watch?v=tyOxU-oUsEw

Thanks to Artec for the manifold: https://artecperformance.com.au

Tyres by Michelin: https://www.michelin.com.au


Song: ‘Amnesia’ by Moog

https://music.apple.com/au/album/amnesia-feat-mark-agustin-erin-renee/829016181?i=829016222&l=en-GB

Thanks to Scott @haltech for the dyno session!

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#RX7 #rotary #13b

Something to note around Mighty Car Mods: we are normal guys and are not trained mechanics. We like to make interesting car mods and show you how we've gone about it, but we can't promise that anything we show you will work for your particular car, or that you won't harm yourself, someone else, your car or your warranty doing it. Please be safe, be responsible and unless you know what you're doing, do not fool around with very serious machinery just because you've seen us make it look so easy. Talk to a qualified mechanic if you are in any doubt. Some of the products featured in this video may be supplied by sponsors. For a list of our current sponsors please go to mightycarmods.com.

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00:00You know, it's unlucky frying your ECU right at the end of an absolutely massive build
00:04But do you know it's lucky?
00:06Every single one of you winning a prize. That's right. At the Mighty Car Mods prize table. It's a lucky dip
00:14This episode is brought to you by Mighty Car Mods and we're doing a special giveaway
00:18If you're seeing this bit of the video, it means you can participate in our lucky dip
00:23We have all sorts of awesome prizes here that you could end up with. How do you end up with them?
00:27Well, if you spend $40 Australian on the Mighty Car Mods shop, every single one of you will get a mystery prize
00:32Now it might be some Mighty Mods merch or it could be something from our friends at Ryobi. We got DakDaks
00:38We got drills. We got lights. We've got this new little mini Bluetooth thing
00:40You might get yourself an Osmo Action 4 plus a whole bunch of stuff from QuadLock and QuadLock now make
00:47attachments for action cameras including suctions, little selfie cams, sticks and stuff like that
00:52Which is awesome, or you might get super cheap auto gift cards, which includes some tool pro stuff as well
00:57So we've got all sorts of different tools small big ones
00:5960 piece socket set and all those awesome little extras you put in your toolbox just to round it out
01:05What do you have to do to be in the running to get something from this table?
01:09Just spend 40 Australian bucks or more on the Mighty Car Mods shop. The link is here. It's popping up
01:13it's down below in the description and
01:16We'll add some of this stuff to your order. You will get something definitely 100%
01:21But for now everybody settle in because today's a heartwarming and epic video a beautiful surprise
01:29By a beautiful man. Martin was also there and and look it's actually a really nice one. So check it out
01:36We hope you are enjoying this series grab something. It supports the show directly sometimes sometimes people are like
01:42How do we actually support the show we do our own merch ourselves?
01:45We pack it we send it we make it we design it where we can we get it made in Australia
01:49So it directly goes to helping us. Yes. Thank you very much. It will self-destruct
01:53So if you're seeing this, it's the offer is on if this is gone or you come back to it. It's over
02:06Welcome to a special episode of Mighty Car Mods where we're cooking chooks people. We're cooking chooks. We've got the brat-brat-mobile
02:12We're cooking chooks. A chook cooker. Is that the thing? Yeah, because you put the chook on the rotating thing
02:18And it sounds like a chicken
02:20They're not making any noise though. They're dead
02:22So's this car
02:24Interestingly, but let's rewind a little
02:28Good job, that's good as a segue
02:30Anyway, we are going to go back in time just a little bit now when we were in Japan
02:34You may have noticed that we're driving around on the highway felt great driving through the twisties
02:38It felt great rotary power is quite linear
02:40But I did notice when I was on the track right towards the end of the film that I saw the boost gauge go up
02:45When I had a chance to look at it and then when the revs came up it went down again
02:48I'm like, that's interesting still felt fast still was great
02:50So when the car arrived into Australia a couple months later, it went through Queensland
02:54It came down to us. The first thing we did was head to the dyno. This is what we found
02:59I've brought the rx-7 down to Haltech to come and see Scott otherwise known as tuning fork
03:04He's one of my favorite people in the world and he knows a little bit about rotary powered cars
03:10It's snug
03:11You've been in these things before haven't you? I have
03:15Nicest-looking car ever made but they're squashy, but they're squashy proper squashy only squashier part is in the back
03:23Oh, yeah, no one's sitting in there are they?
03:26They're so deep a the bucket. Yep
03:28See, yeah, it's nice because you can like put your keys and your fruit and stuff in there keys in your fruit
03:32It's like a little fruit bowl. Look at it
03:35Yeah, you're all the way back
03:37Yeah, I mean even even I'm looking for I'm about six one and I'm looking for
03:41Better seat options because I can't get far enough back and my knees hit the steering wheel
03:45So on the road, this would be really tough for you, right? Impossible impossible
03:49But dude for the dyno who cares the dyno who cares and to look as cool as you look driving this car
03:55Sacrifices have to be made
04:01Stock
04:03Only a couple real mild mods. I think we've got a trust intercooler in the front. Mm-hmm some kind of muffler on the back
04:08I don't think it's a full exhaust, but I haven't had a proper look
04:11And aside from that, I don't actually know it's got oh, it's got an earthing kit
04:16Super important very very 90s cool
04:21First pull up full throttle hit the spacebar rotary power
04:35Really late
04:39I
04:41Started to make some more at power, but it really leaned out in there
04:44Yeah, that's a weird. That's a bit weird
04:46And it did it went in like big jagged was that what I was saying big jagged line there what I might do
04:52I'm gonna move the o2 sensor in the exhaust and just make sure that we're getting the proper sample because
04:57That is it might not be hitting the sensor. Yeah, that is fairly nerve-wracking. It feels alright. It sounds good
05:04Yeah, it's fine on the street
05:05But worth a look
05:07This is a good reason to help check your car when you buy it
05:12Doesn't have a stupid on the silencer
05:17So all I've done is just move it to a different orientation just in case the muffler was happy in whatever area job
05:23All right, same run round two. Oh, we're gonna we're just gonna do exactly the same thing. Yeah, no changes
05:30And hopefully our mixture comes to good and it's more of a measurement problem rather than a car problem
05:35I am gonna pull out of it. If it's like that again, I don't want to be given a pill
05:43Maybe it's good you press the spacebar. Oh you press it
06:05Oh
06:09All right, all right looks like pretty stock power too, but I'd be interested to see straight into it
06:14Oh, yeah, but oh, this is it the things work. That's harder. That's gonna work right full load. All right your turn
06:36You
06:42Beautiful super consistent there man
06:46I'd be very interested to see our boost curve hundred percent. So
06:51To feel all right on the road. Uh, the top end feels a bit flat
06:56There we go. So pull on pull I'm gonna argue. They're exactly the same with a bit of heat soak
07:00Yeah, so we made up the top here. We either had
07:06Let's just find a nice point to talk about
07:09Yeah, what 127 or 124 whatever? Yeah, so they were close enough that they're about the same. Yep
07:17If your ratio on the rotary engine so as the run starting
07:22We're at 11 to 1 11 and a half to 1 and then as soon as we come across
07:284,000 rpm 11 to 1 rich. Yeah, the revs are up there by then. We keep on cruising and revs for ever
07:35Rims forever. So you think it's only boost pressure holding us back. Really? Yeah. Yeah, it looks like it's dropping to me
07:41A lot of factory stuff. Yeah, significantly it does roll over so down here
07:46That's got our engine rpm down the bottom. Sure, and then it's got the boost pressure up the top here
07:50So three or thirty three hundred rpm 11 pounds
07:54You can see the staging point there
07:56That shouldn't be dropping that hard should it? I mean, that's my fear. I don't know enough about them
07:59But 11 ish pounds and then it rolls over to a
08:04See I can't imagine they'd have
08:07Factory to have six or five or six pounds in it. So it's hot in these things. I agree with you
08:12So it's probably is down on power a little bit. I reckon it is
08:14I'm imagining you guys have a solution for this car to correct. We do. Yeah, so we make a plug-in kit for
08:20We do yeah, so we make a plug-in kit for series six seven eight
08:26Plug the ECU in turn the key. It just works. Sweet. I'm excited for that bit
08:30That's a little while away, but I'm pretty excited for that. Who's control all that stuff. It'll make that easy. Yeah
08:35I'm super keen to just make it work
08:37Do you imagine like with a single turbo and a reasonably mild set up 200 of the wheels is reasonable 100% probably?
08:42Because I reckon this would be fun with about 200 200 plus would be great using the same rules as later
08:48Subarus later evos all that meant if this thing had to 20 to 250 kilowatts of the wheels and it was reliable
08:55Yeah, and it comes on and it makes 300 350 newt-meters just holds it till the limiter
09:02That'd be a good thing beautiful. I think that's the aim. I think that's that's about the right
09:07Spot for it. Yeah
09:09All right, find a manifold kit. We'll do mate. So the car doesn't make enough power and there's clearly
09:15Something wrong with it
09:16So now what we've got to try and work out is what are we going to do to fix it Martin?
09:20And where are we going with this story? Where's the what's the end goal?
09:24So the end goal is probably around double what it made on the dyno would be great
09:28I'd like to keep it on petrol just because the availability of a 85 and it's like it's something you do want to jump on
09:33A highway and just go so if you don't want to be having to worry about Jerry's and stuff. It's not a race car
09:38The things already been modified. So I'm leaning more towards like
09:42Putting modern stuff on it. Should we talk about purity quickly?
09:45So here's the consideration and I think it's a really fair one. Do you just purify the car?
09:50keep it exactly as it left the factory as it left Hiroshima as it was intended or
09:56Do we get with the times and change it up? And I think there's actually an argument for both of those
10:00So ultimately we got to find out what the owner thinks
10:03So I think if I bought one that was bog stock
10:06Really nice and all that was wrong with it was it was down on power
10:09You just purify it right he's gone and then you go. Oh, yeah, then you go cool
10:13I've got a 2002 20 year old rx-7 that is exactly as it rolled off the factory line
10:18Which is the way it was intended with maximum purity and I'm all for that for certain cars
10:22particularly
10:23I think if you're either one of those people that wants to keep a museum piece or you're looking just to sell it and make
10:27Money because if you have a working one, that's full purity untouched
10:31It's gonna be worth more money than a modified one, but the experience of driving it on the road
10:36In its current form broken is not so great. So I had a quick look
10:41I just basically pulled one or two hoses off to have a look and see if there's anything obvious and
10:45Stuff started just breaking in my hands. Like there's just bits of rubber that all the rubber is really hard
10:51In all the vacuum. So all this twin turbo stuff
10:53We've backed look straight away vacuum actuated and one of these has just snapped off the little vacuum tank that's up here
10:59Then there's another like boost tank that's down there. That's also broken
11:02You can't get to any of it without pulling everything apart
11:04So you either go full purity and you replace all this stuff and stay twin turbo, but being that's already modified
11:10And being that there is some really cool interesting stuff available for these these days
11:15I'm leaning more towards my isn't this also super expensive to get parts for this some of these actually like crazy. Yes
11:22There's a big
11:23mess of solenoids in there that control the twin turbo system that the controllers them are pretty expensive to buy now because
11:31Again, 20 years old. So I think you can get some of it new still
11:35But what I find interesting is so that the elephant in the room is going
11:39Okay, you get rid of two turbos and you put one more than one there
11:41Yeah, like that's a very very popular modification on lots of cars people don't do it as much with Subarus though
11:48Do they well, I guess that we only got what we only get there. There's only a couple of times
11:52I go once yeah, but they weren't very good and honestly
11:55Yeah, most people just get stuff off an STI and put it on a single them as well
11:57So yeah, okay twin turbo like I've owned a couple of twin turbo cars and I think they're great
12:01I know it works well on this particular car, but turbo technology in the 20 years since this came out has improved
12:06Yeah, vastly billet wheels lightweight in like good housings see affordable. Yeah, and so it might actually be a lot
12:15simpler to
12:16delete this and
12:18Stick a single in there and one of the reasons is we go from about I don't know 40 vacuum lines to two
12:24Yeah, there's one going to the ECU. There's one going to the boost control and that's it
12:28I think that's the thing as well with cars like this
12:30They needed to be complex to kind of run all the different systems that were required to kind of make that power somewhat efficiently
12:37It's not required anymore
12:39So it's probably something that you see a bit of a theme of on mighty car mods when we're kind of doing older cars
12:44Just trying to make them something that you can drive around reliably and they work like a normal car. I love the purity
12:50I love people keeping things original, but a lot of people that are kind of playing with purity cars
12:54They are they often don't get to enjoy them because they're not working or there's a very very specific
12:58We'd be community required to get parts for them. So I think I really we just need to do an investigation
13:03I don't know much about these cars. I've never in the rotary
13:06Marty has owned to none. Oh, I and a series one. Yeah, that was my first rotary
13:11I learned a lot on that but this was always the one I wanted to own but it had to sort of step up to
13:16It so I think what we should do is we just get all this stuff and chuck it in a purity box
13:22Yeah, so we don't get been anything purity box all that stuff and then start having a bit of a hunt around for what we can
13:28Use to modernize this that is a long-winded way of saying we're going single turbo
13:35Going to the diner proved what we suspected that the second turbo was doing basically nothing
13:39Well more likely the complex system of solenoids and valves have seized up and broken down over the past two decades
13:46Turning this beautiful looking sports car into a nugget that would lose a drag race with a Hyundai i30
13:51This is all new for us
13:53I've never owned a 13b powered car and I've heard and read that working on this bends your mind in ways
13:58You could never imagine because while it still sucks squashes and bangs fuel
14:02The way it does it in the round and round manner instead of up and down changes everything
14:08We're also dealing with technology that was designed in the early 90s and used right up to the early 2000s
14:13Which means a lot of this stuff was great for the day, but technology has definitely moved on
14:17Have you got yourself a mighty no-rod shirt yet? This is limited edition
14:21It only exists while we're doing videos on this rx-7 and then it's gone
14:24If you want to grab one now, it's your chance. Click the thing below Mazda packed this engine bay full of stuff
14:30But there is method to it
14:31The engine sits close to the firewall and low down which helps with excellent weight distribution
14:36The twin turbo system is also compact and a very necessary power adder to wake up that 13b
14:41When you drain the coolant, it sounds like a rotary
14:47It's like it knows
15:04So pulling all that stuff out the front of the engine has revealed the 13b
15:08It's kind of actually tucked away and hidden and
15:10It's like a weight balance thing to have the engine so far back because the shock towers are here and most the weight of the engine
15:15Is there but 13b is already very light for how much power they put out?
15:19It's one of the reasons these are such great cars. Also. Interestingly is the radiator is mounted like flat nearly flat
15:25I guess you'd call that like a beam out thing
15:27So there's lots of options for intercoolers now the one you saw that came out of there the trust one full 90 spec
15:32Yeah, get it go. Oh, dude, good shot
15:35Was mounted in this space and then it's ducted some air comes through here and ducts into the intercooler
15:40That means it all sorts of bolts together reasonably factory
15:42You can change this set up with the radiator air con and intercooler to be the V mounted or or front mounted
15:49I don't know what I'm going to do, but an intercooler upgrades most likely on the cards
15:54Just because we can and the stuff exists and it's local and it's a really good quality. It's not that expensive
15:59So we're just going to keep pulling some stuff off
16:01We'll pull the stop of the manifold off so we can get to the coils because that's something we could probably look at upgrading
16:07Replacing we also need to get rid of all this stuff all this
16:10Rubber is like brittle and very very hard. So all that will will go in the bin, but we'll keep at it and
16:23No offense Mazda, but like yuck look
16:26Look at this full respect to rotary people who deal with this all the time and fix them
16:30But like that is there's a lot going on
16:33I guess the packaging is cool
16:34Like all the coils are hidden under there and it's all real tight and neat
16:37Man, there's a lot of stuff that can go wrong here with age all tucked away. That's a big job to get that off
16:42Actually, that's like a good probably hour of pulling stuff apart. Oil filter is never a tricky spot
16:47so many
16:49Vacuum solenoids and and one-way valves and and rubber stuff and everything is brittle
16:55So I guess if you were just gonna stay twin and go completely stocky sealant sort of stuff
17:00I guess you just have to replace it all which is whatever I did
17:03Not me, I'm gonna keep yanking some stuff off and then work out
17:08What to do next we're gonna take the car over to super garage so we can stick it on the hoist
17:13Next on my list is to remove the twin turbo system and all its related components
17:17To do that the exhaust is going to come off along with a bunch of bracing brackets hoses and wiring
17:23I'll throw it all into a purity box
17:24Which is where parts go when they don't go in the bin as they may need to be reused or can go into someone else's
17:30project
17:31You don't see too many of these cars on the road in stock form anymore
17:35Especially not being daily driven and there's probably a few reasons for that
17:38When you factor in the cost of original parts and the labor to fix it
17:42You're well on your way to an upgrade that will improve the car unlocking more power
17:46Reliability or both the aftermarket is once again here to make this easier than ever with a heap of quality parts
17:52That will keep this thing on the road for years to come and installing those parts is easy
17:56As long as you can manage to remove all the stock stuff, which is turning out to be easier said than done
18:05One thing I am noticing is that all the factory parts feel quality
18:09It's clear that this was a more expensive car than a basic entry-level WRX or performance car
18:14These were competing on the world stage for buyers of sports cars heavily image driven with the performance to match
18:20Performance that will increase a whole lot assuming I can actually pull it apart successfully
18:26I
18:33Know you've waited so long time and time again
18:37All you say is that I did you wrong so you turn your back on the world pretending to be strong
18:43But you're crying deep inside. You're still hurting from the lies and I'm the man that you despise
18:51Now you act like you don't know me how does your FD rx7 that's got a sequential turbo system work
18:57this thing makes it work this mystery box of
19:01stuff
19:23That dump nearly beat me but it's off
19:26my goodness
19:33All right, so the final stud
19:37Snapped
19:39So that's a problem for Ron because it's still stuck in there in the engine, but the turbos themselves
19:44hopefully now should just pop off a little water line and
19:50Correctly
19:57I
19:58Come check this out
20:00So one of the things I both love about this rotary and hate about it is that is a really difficult job
20:06to do but it's also kind of impressive the
20:10Thought that they put into making this system because I mean you can see there
20:13That's two turbos right shares the water feed the oil feed comes in through here
20:17The exhaust gas goes in through those ports
20:21there and
20:23Then he shared goes through the turbos and then he shared like it's such a
20:27I've never really seen anything like it. The Subaru one works totally differently. They're separate
20:31These are together and in this one sort of reasonably compact, you know
20:34Which is why it's so hard to get off the car because they're trying to fit a lot of boost into a very small space
20:38I'm very very interested to see how we go with a single turbo conversion using modern turbo technology in that space
20:45It should be neat. It should be easy to work on and it should make as much if not more power
20:50But yeah, I've never actually driven a working
20:52No, I have driven one working FD RX-7 with working twins and it's good
20:57But is it as good as a single guess we'll find out
21:00I don't think these turbos have ever come off the engine
21:03It all seems pretty factory fresh and the low kilometers on the car would reflect that
21:07But also 20 years of heat cycles have practically welded some of these fastness together making removal pretty difficult
21:14Final piece of the puzzle coming off
21:16the actual
21:18manifold bit
21:20front rotor rear rotor
21:22flappy stuff in there
21:24To do it's a it's flappy work
21:26And I think what was not working was one of these flappy valves wasn't flapping and that's why we weren't getting a nice clean
21:32Transition to our secondary turbo and all that power and now down in here. It looks a little bit more typical rotary
21:39Well, it's pretty clean too. I think I've got a leaky remain seal and that lower rear stud also came out. So
21:45I'll need to investigate new gaskets. I don't know if you can reuse these
21:48I'll ask some rotary expert and tell me and
21:50Then the next step now is to tidy up all this stuff that we no longer need like every single vacuum line there is no
21:56longer required
21:57The oil feed will use and the coolant feed that will use and the oil returns obviously
22:03And that's that so a nice fat single turbo will go in that space. So watch this space
22:08I've learned a lot by pulling this thing apart
22:11Learned that a good proportion of it needs to go in the bin because some awesome new parts will soon take their place
22:18Another big piece off
22:20That's the lower intake manifold
22:24bit
22:25We probably will reuse this I think but we will delete a lot of extra stuff. That's not needed
22:30It's also where we can change injectors and do other cool stuff like that
22:33So to go single turbo, we need a single turbo, but also a manifold to support it
22:38So I've got two options here. Both are from Artec, which is a Sydney based company
22:42This is like stainless steel investment cast really nice stuff. So you can see there's no welds in there
22:48That's all a cast piece. That is a t4 flange, which is also split pulse
22:52Which means the pulses that go in there also go into the turbo which you'll get a split pulse turbo to suit it
22:58And there's also a v-band one similar idea and they basically sent to and use whichever one
23:03works best and send us back the one that doesn't so
23:07Next up is to try and work out what kind of turbo to put on it
23:10but before I did that I wanted to actually just test fit and see where it sits and get some sort of measurements and
23:15And work out what's going to happen. So we'll throw this on and have a look
23:18It's a nice piece of kit
23:19See what looks like and just like that an important piece of the puzzle is in place
23:23This will successfully low mount a g35 900 for a great balance of response and power
23:29One of the most fun parts of modifying a car like this
23:32Particularly a JDM hero like this is all the options you have for wheels now the wheels that came on it
23:37I like because it was aftermarket and the thing was already modified but the wheels themselves. I don't love there's other wheel combos
23:44I've seen on rx-7s that I always think look really really good
23:46But it's tricky because it's so subjective everyone has a different opinion on what wheels look good, but I have found some
23:52Accidentally come across some that I think might look amazing and it's these
23:58which are
24:00BBS LMS and they're a staggered set and you can see they're slightly different. This one's got a little bit more lip
24:04This one's got a little bit less so front and rear
24:07We've put them we've put some tires on them. I've got a set of Michelin Pilot Cup Pilot Sport Cup 2s
24:13For the front. These are actually off the Yaris and then a set of 265
24:18Michelin Pilot Sport 5s which are test ones we got for the Levorg
24:21So we just happen to have those tires sort of waiting around
24:24So I've put them onto this set of BBS and you're coming with us for the test fit
24:27Thought about test fitting it and then shooting it later. I'm like, you know what? Let's just let's just do it
24:32So you come with this. I hope it looks as good as I think in my head
24:36It might look good now
24:37rx-7s actually came with some BBS wheels back in the day and they were a very similar color
24:41But they're a bit smaller
24:42I believe as well because in this era everything was 16 inch right and 17 was considered big this already has 18s these 18s
24:48So let's see how it looks
24:50I
24:56Was today is old when I learned that these BBS LMS have like a built-in
25:01Centering ring thing which is specifically made for hub sizes. This looks like it's just the tiniest bit too small
25:07I would say like a millimeter
25:09So I'm assuming you can get different ones of these but they're held in by a circlip which is a bit tricky to get out
25:13But it's a circlip in there and if you can see it, but if we dig that circlip out
25:17We should have wheel freedom to at least fit them and say they look cool
25:20And then we can look into actually getting the right hub centering rings
25:41I
25:42Like it and there's a few different options for a car like this
25:44You can go full period correctness with all your mods and put wheels that are from like the exact same era and all the mods
25:50Are from the same era
25:51Or you can go completely original and I have a lot of respect for people that are able to do that
25:55And this is somewhere in between I like the dish and I like the gold and I like everything that's going on here
26:01I really do. There's so many good wheel options for FDs
26:04You've only got to Google it and you'll see there's like a hundred different ones you could do
26:07But I'm very happy with these particularly these wheels are pretty inexpensive
26:10They were secondhand and we also able to recycle some other tires that we had sitting around
26:13So that's a pretty good upgrade and the Graham lights are gone something else

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