RX8 231 gets braps! Bridge ported engine and 5.8 rear diff
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- Опубліковано 21 жов 2024
- the rx8 race car gets a new bridge ported engine and 5.8 to 1 rear end. I have a few problems to overcome in this one but we get there in the end! Thankfully!
FYI bridge ported motor will never idle or run to its full potential on the stock ECU tune. Bending or drilling a small hole in the butterfly does provide additional airflow to resolve the idle issue as you’ve done. But ideally, you’ll need to adjust the tune in the ECU to gain the full advantage of the Bridgeport engine.
Really enjoying your build series. I race an RX-8 in the CSCC Trophy series (essentially standard cars). Looking to make my RX-8 competitive for the trackday trophy regs this next year so will be following some of your footsteps. I've got a 5.3 final drive gear ready to build for mine, did you find you had to shim it to get the end float correct? Are you looking to race your RX-8 too, if so what series are you thinking?
Thanks man, much appreciated. To be fair the 5.3 is probably the better option, I just like to go a little extreme where possible. Yea the diff had to be shimmed a bit. No I don't intend to race it I don't think, I just like mine to be the crazy track car that it is (I'm not a very good driver) I just get out a few times a year to have some fun.
Vids are worth waiting for man.
Broke the bridge!
did you tune the engine for the bridgeport? This is the reason I didn't go for it while I was rebuilding since there was no one in my country that would do it lol.
Nope, no tuning necessary. The ecu will compensate when you get enough miles into it
@@TGBuild270 interesting 🤔 I know you can teach the engine maps and reset them yes, but I thought you get far better results by just tuning it and also tuning the cool braps while your at the tuner 🤷♂️ would love to see the power differences with and without tune.
@MassiveDrop this one braps with not tuning. Ecu is completely stock, never been plugged it. I imagine you can squeeze a few hp out of the top end with a map but I'm very much a "mazda knows best" when it comes to these engines. Well see how it is on track and if I think I'm leaving something on the table I'll get ut tuned and see how that goes
@@TGBuild270 the ECU needs to be configured.
Hey bud, been watching you for a while continue the work cant wait to see it on track. L
If you wouldnt mind me asking how did you bend the butterfly on the tb? Im having a issue very similar on my 8 and can only imagine it being the porting, no vac leaks, no inj issues and no fault codes. I will have a spare tb so might try bending it with your trchnique and hopefully that will help it if not ill replace it with the spare.
Thanks in advance
I just opened the butterfly, popped a bit or cloth on there and bent it with a pliers. It does require a little bit of time as it'll need several adjustments to get it where you want it. Hope this helps 👌
@@TGBuild270 hey, thank you for gettng back. Makes sense ill give it a go. When the adjustment was too much how did you know? Obviously it being to little it will do the same but being tok much would it stay started? Thanks
@joflexx.. it'll idle to high, the problem is the ecu does take time to adjust so adjust it to roughly where it idles nice then go drive it for a few miles, let it idle for 10 minutes, switch it in and off a few time and it'll probably change, then adjust it up or down as need and repeat
@@TGBuild270 hey, youre a legend thank you! I will give it a go!! Keep up the good work cant wait to see it on track
loved the video! I'm 21, from UK and wanting to get into mechanics any tips you have would be appreciated
I'll give you the same advice my farther and brothers gave me when I said I wanted to be a mechanic. Don't do it!
If cars are something you genuinely enjoy and want to get into, do it as a hobby, if you make it you're job you'll learn to hate it.
What's the purpose of the wrapped intake manifold? Heat management?
Yeah, it's heat reflective wrap, it also just looks cool 😎
@TGBuild270 it's pretty sick. I just started building up mine for Time Trials in my local racing area. My first track day was last week. It performed well, but there's some tweaking that needs to happen. I'm buying what I can afford in order of importance, so I think coilovers and bushings will be my first "after race adjustment"
Where did you get the 5.3 and 5.8 ring and pinions?
The 5.8 crown and pinion came from Australia. I had to get it imported.
@@TGBuild270 How can I get one ,from who?
@dmarshall34 I got mine off an Australian company that I found on ebay. I've checked and it seems they're no longer trading there. Hit Google and I'm sure you'll find someone selling the part online.
you need to increase the idle speed to stable (judging by the first minutes of the video). The cross section of the exhaust system seems unnecessarily large.
Are the ignition coils standard? It is better to use something more powerful such as coils from Chevrolet LS series engines.
5.8 - In my opinion very short gears... On stock gearbox and stock tires: 1 gear /9000 rpm ~ 50 km/h, 2 gear ~ 84 km/h, 3 gear ~ 124 km/h, 4 gear ~ 162 km/h, 5 gear ~ 190 km/h, 6 gear ~ 242 km/h this is according to calculations
Unfortunately I use thruxton circuit, it had a 90 dB noise limit so all that exhaust is very necessary. Coils are OEM, yes. 5.8 is very low, it will put my top speed around 130 but that's enough for most of the UK tracks I use
@@TGBuild270 it explains everything! Good luck!