djdiablo

Okay guys and girls,

I need some advice. After thorough research I was very set on eventually getting the GT35/40 turbo kit from A-Spec. I just started reading up on the latest BNR twins (Stage 3 non seq) and now I am confused. Here's the deal....my car will be street driven, use ONLY pump gas (92 octane here in Hawaii) so I want to keep the boost at 15psi max. I am looking for minimal to no lag, strong low end and midrange, don't really care about top end or high speed, hoping to get around 420rwhp. What I am thinking is if I am only boosting at 15psi max, is it worth it to run the GT35/40 or should I just go with the BNR's? Being that it is a pretty significant difference in price for both setups I don't want to choose wrong. My plans for the car are autoX and maybe time attack trials, no drag racing. Here are some of the mods I have if this would help.

-Apexi N1 catback exhaust
-Apexi Power FC w/Commander
-M2 carbon fiber intake
-M2 large SMIC
-s/s downpipe
-Pettit AST

Motor was rebuilt not too long ago~20,000 miles?
Fuel system is stock (needs upgrading either way, I know)

Any advice is greatly appreciated!

Sonny

G's 3rd Gen

iTrader: (11)

I think in your case it would just be a money issue. Either way you have to bump the secondaries up. Performance wise I would think pretty close. Gong single would mean exhaust manifold, intake, refabrication of the hotside intercooler piping,etc.

DrPJM1

I have been very pleased with mine. I would recommend it.

ZoomZoom

iTrader: (2)

Sorry but no single turbo will give you both 420 rwhp at 15 psi and Little to No lag. Now 340 HP with little to no lag is possible. You can get the 35R with a .82 hot side and will spool great.
Even with my Old 35R with the 1.06 hot side it still lagged considerably more then the twins.
What you will find when you make the HP you want to make is the lag issue is way over rated.
420 HP will be too much hp for the street anyway. And even if you could make 420 to the wheels with little to no lag you wouldnt ever have the traction to put it down.
You should try driving some single turbo rx7s so you can gauge what you really need and want out of the car.

GoodfellaFD3S

iTrader: (213)

I recommend running the new stage 3s sequentially. The GT35/40 is a great turbo also, but when you take money into account the BNRs are definitely the most cost effective setup. Also, for auto-xing you will want the nice down low (from 3k rpm) power of the sequential setup. From what I have seen over the years, the *only* single that gives the same low end as stock seq twins is the apexi rx-6, and that turbo has poor high rpm performance (and costs a ton) so is not an ideal choice.

You won't make 420 rwhp at 15 psi with any streetable setup on an FD in my opinion. I don't think you realize that even ~375ish rwhp is enough to crush most cars on the street.

Go to www.BNRSupercars.com and call the # on the site, tell Bryan that I sent ya. If you have any other questions, feel free to PM me

mp5

iTrader: (3)

Running the twins at 15psi makes the FD come alive(easily 350 to the wheels with a streetport)
if you dont have issues with your car I would keep the twins.
Running parrallel will give you more,so will porting your turbo housings and enlarging the downpipe manifold.
I think Mike aka Rotarded on the forum, got 385 on a Mustang dyno doing that.
My only concern with the twins is the way the manifold heat sinks the motor,now thats on the track and only after 20 minutes of all out,I dont think even in Hawaii you will reproduce those temps on the street so I think you will be ok.
Now if you HAVE to replace your setup BNR,s or 35 R I would consider going single for simplicity.
C.

djdiablo

Thanks for all the responses guys. I forgot to mention that my stock turbos are now running non seq, they were that way when I got the car and there really is no noticeable lag. I guess I just kinda want a better overall powerband versus the light switch type for my style of driving. Another factor is the under hood heat, it seems that the single would run cooler than the twins? As for the horsepower, I figured 420 was doable at 15psi after seeing Silver Ninety Three's post about his GT35/40 at 19~20psi making 470 rwhp, but I guess that could be due to the porting and race gas too though. Anyway, thanks for the help, I am still pretty undecided though so any other info you guys have is welcome.

Sonny

G's 3rd Gen

iTrader: (11)

oops. didn't realize you wanted 420 to the wheels. not efficeintly on the bnrs. my bad....

Fritz Flynn

iTrader: (263)

1st decide what your goal is. 420 rwhp or having a quick responsive car. I think you want a quick responsive car so go with the BNRs with some 1200cc secondaries and make a safe reliable 300 to 320 at the wheels.

Once you go past about 350 rwhp your reliability starts to decline considerably. IMO 300 rwhp is about the limit if you want your car to run for 50k miles on the same engine. Remember its not that hard to pop a stock motor making 220 rwhp. Slightly clogged fuel filter or injector etc...and your engine could be toast. Rotaries love boost but can't handle knock which is a dangerous combo.

Power is a drug so you will continue to want more and more which leads to the BOTTOMLINE. If you have money to burn go single if not stay with twins. Good luck

the_glass_man

iTrader: (2)

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