Ok so ive been in the 10's for a little while now with my BW s362 on my 93 rx7 and supporting mods. Now im searching for some 9 sec passes and wanna go e85 with supporting mods but need to figure out the turbo to go with. For NSCRA true street i need to stay under 72mm and figure i need about 650rwhp or more to get there(im at 475rwhp with a best of 10.63). So im looking at the BW s372 but dunno what a/r i should go with thinking at least a 1.10 or the 1.25 t4. My engine is a PFS built large street port with atkins apex seals and pretty healthy. Also not looking to take forever to spool but i expect lag. Just need some shop and tuner advice because im having trouble getting ahold of anybody to ask.

Thanks

 

You are right around the limit for IRS and a regular manual transmission. If you just go with a bigger turbo don't expect better time slips. Those are impressive times for your setup. Be happy with what you have or build a drag car on the side.

 

Yea kinda doin it for the class, all these "true street" cars never see streets let alone even have tags. I still have a/c and p/s and one of the few rx7s hangin in the class but the only reason I hang is being consistent off the light and down the track but just not cutting it now. I know ill be blowing trannys and axles but its kinda part of the sport ya know. The rear is a t2 diff and held up great down to 1.45 60's and think that can hold but usong stock axles seems to keep the weak point there and not the trans so I keep plenty extra and only take like 10mins or less to change. But still drive to the track and home like all the rest of the events I go to lol.

 

I would ask Ray as he'll be your tuner. If he doesn't have an answer for you I would be pretty disappointed. You'll be looking for a 70mm compressor wheel for sure. I would choose the A/R solely on where you want to rev the motor to...

 

yea I've tried contacting him for awhile now email calling leaving a message with no response, he tuned it last time and its been flawless for over a year. But want him to install aem and tune but need to get an idea for the a/r since he know the engine and what it can do since he built it. But need to get things rolling cause the first event is in april.

 

I would try to find a 1.15 a/r if you could (I don't think they make them anymore new). As long as you have a free flowing exhaust you should crack 625whp no problem with a 1.10 a/r...

 

Well lookin at the rules i can have a 72mm so now im lookin at the s472s heard the t6's flow alot better, but wondering 1.10 or 1.32? Ill be running 4in exhaust all the way back and 2in runners on my manifold. And bulleyes has the billet wheel option so may go with that.

 

I thought we were still speaking t4. I have no experience yet with a t6 frame so I'll see my self to the door

 

Yea im really not sure if goin t6 is worth it, but like i said need an idea Ray reccomended everything last time lol. I apreciate the help though

 

enzotuning will get you in the 9's his turbo setup works to get the car really moving.

 

S472's sounds like the ticket to me. I think I have proven the gt4094r can go 9's but thats only a 68mm so why not go bigger if rules allow. You could always look into the Garrett gtx units like Ernie picked up.

 

A friend of mine has the same goal but in a 12A powered 1st gen. He ended up with a 1.15 T4 Q-trim turbo. Compressor wheel is around 67-70mm not 100% sure.

Also FYI

Garrett also have a new turbo in the GTX lineup that uses a 71.8mm compressor inducer to fall just inside that class rule. With that 71.8mm GTX-4202 you have a few options for turbine housings

Divided T6 in 1.01 or 1.15 (5" vband for exhaust)
Dvided T4 in 1.01,1.15,1.28,1.44 (4" vband for exhaust)

I would use the T4 with the 1.44. Size the injectors for 7:1 air fuel ratio (assuming you use E85) and full compressor airflow.

There is a lot of speed/power to be had with this setup. A good friend of mine has a DOHC RB30DET drag car that has ran 10.5 1/4 mile with only a 3/4 pass.

 

Yea i was talking to enzo as well. As much as i would like to buy his kit i cant afford it because i still gotta upgrade my fuel and ecu. So plan on buying the turbo myself and have the sch10 2in already and 2 precison 46mm wastegates so my friend who is a fabricator can fab me up a manifold and save on that. The fuel system already have one 044 going to add another and run -8 feed line and -6 return and buy a cj fuel rail kit because i dont like mine. Injector size is going to be up to the tuner. Just making sure i get the right a/r so it all comes together. So im on the s472 but there are 3 different exhaust wheels 2 are made for the 1.10 and there is one that has the 1.32 housing so trying to figure out 1.10 or 1.32?

 

83mm if you're t4 and 87mm if your t6. I don't want to get kicked in the nuts for saying this but I think you can do it on the t4 frame and t6 is overkill.

This is coming from someone with a t4, 83mm wheel and 1.25 a/r with a 75mm compressor inducer

 

Ready to get kicked in the nuts?

you will need 1.32

 

^ At least I saw it coming...

 

Lol alright. Yea tax refund is coming in so should be ordering it soon

 

That should be enough turbo to take you deep into the 9's. Have you thought about tranny work? Are you already on the 2 step/ antilag?

 

Can't afford a race trans and heard stock trans upgrades are worthless, so ill keep a spare trans mines held up a year. Im foot reving on my power fc and goin to switch to autronic or aem so I have 2 step.

 

Dont believe everything you hear! Just like stock axles wont hold...

Liberty conversion (faceplated, etc..) stock tranny will shave a tenth on each shift. (ask Enzo)... (shhh... more than a few of us running that on here)...

Could easly do the MSD 2step with your PFC and pick up a tad more there also.

Have you maxed that s362 out yet? Race gas tune? I am not real familar with that unit.


Your times and set up remind me allot of myself and past times and what my future plans were. I was also looking into a larger turbo for more power. I ended up trying to utilize what power I had and make changes to other area's. First time out proved to be the correct move for me. Anyway, good luck to you and on your decision's

 

oh.. if you want to trade. I have a AEM I will swap for a PFC.

 

Yea lol ive broke think 3 axles in a little over a year so it aint that bad. But heard the money you spend on the stock box you might as well get a aftermarket and when you fix the problem with not snapping the input shaft then the case is a weak point. I havent stripped a gear yet but think my dad bent a fork because i lost 3rd and had trouble finding 4th when he was "racing" a honda lol.

I didnt like msd because i see alot of failures with the msd boxes and the hkstwin power offers better spark so didnt want to take out the hks just for 2 step.

And as for the turbo Ray at the time said id max out around 550rwhp or less and that wont take me where i need to go. The true street bump is like a low 10 and fastest car went 9.15 but like i said they never see street, i make it a point to drive there race and drive home. Was runner up at IFO last year at my local track and beat out faster cars to killing the light and staying consistant but my manifold cracked and lost alot of power. Then at NSCRA i made it to the semi finals one event but got beat out by a 9sec supra.

I might take you up on that pm me

 

I heard the same bad things also on liberty conversion. So much wrong info floating around on this **** forum.... Input shaft isn't such an issue. It's the output shaft and there is a chromoly upgrade out there.

Tranny I run, Enzo's brother and re motorsports to name few. There are many more.

Also on the ignitions, I ran the hks before and have been more than please on the msd

Same setup with tranny upgrade and msd swap picked up 1/2 second in the 1/8 th alone.

 

Gtx4294r