homie

I'm new to this although this is my second 3rd gen RX7. I'm looking to upgrade my turbo but want to maintain the twin set up. How much power do you think I can get to the wheels and with which turbo set up? I'm trying to get around 450whp, but want to keep twins to minimize lag. Any advice would be great. Thanks all !

Homie

93BlackFD

bnr stage3 turbos will get you there, or near there

Cihuuy

going to upgrade your turbo but want to maintain the twin set up??

Easy... get the '99 spec jspec turbo with all the necessary ecu,etc... how long hav you had your car?

apneablue

Personally I think it's financially wiser to go with the BnRs than with the 99Spec turbos...the stage 3 BNRs are $2300 without core charge and I think the 99spec turbos are around 3k...The stock twins I have seen forum members get as much as 368rwhp...The BNR stage 3 is capable of 450rwhp...Haven't seen a dyno sheet for one that has actually hit that though...it's been between 400 and 425rwhp.

homie

Thanks all for your feedback. I have a 94 R2 with: Apex N1 exhaust, intake, intercooler & Power FC, HKS BOV & downpipe, Koyo, M2 pulleys, ACT clutch, 850cc injectors, and suspension mods. I'm dyno'ed in at 336whp with stock motor and turbo's. Out of ideas to squeeze more power but not too bad so far.

I'm not familar with the 99spec jspec turbo or the BnR. Can you guys tell me more. Thanks!

Homie

apneablue

You can read a little more here

apneablue

A cool little dyno graph of the stage 3s

homie

That's great Apneablue! Thanks !!!!

Homie

911GT2

boost-in-rx7s93

I do not have any sugestions for your upgrade but do you think that I am headed in the right direction? I am about to start forking the cash trying to reach 315 to 350 at the wheels with this setup? will it work?
(rebuilt 13b 2 peice 2 mm for 1500)
(street port for 200)
( hks 72mm donpipe for 225)
va. hose simplification need chart or something though have no clue how to go about the vac. job for I was going to get rid of over half of them by going single plans fell through due to budget!
( NEW! Trust Airinx dual intake filter system for 275)
and I already have a 80mm nurspec exhaust with 3 inch pipe running to stock downpipe, and plan to keep the streight pipe there for the extra expense of a midpipe is not needed right now.

does anyone know of a better set up for stock twins or a better price for these products? I plan to watch the boost guage with both eyes while breaking in the motor so I can save up for either a computer or the apexi avc-r! ( I think taht is what it is called?

once again thinks for the support and sorry to take away form your post!
joe

Mr rx-7 tt

iTrader: (5)

The highest hp KDR has seen out of the BNR stage 3's on a streetported engine is ~370 rwhp.

450 rwhp? No way...

Marshall

I agree, 450 rw probably won't happen with sequential twins. I think you could have 400-420 with a nice fat powerband though going non-sequential BNR stage 3s.

AnthonyNYC

iTrader: (3)

I know John Duarte made 400HP to the rear wheels and backed it up with a trap speed of 122MPH about a month ago.

Anthony

kwikrx7

Depends on what you want the car for. If you want to do a lot of racing with the twins you could run the BNRs non-seq at 18-19 psi and you'd pull above 430 rwhp. I'm running the Stage 2s sequentially and it has incredible pull for the street. I'm only running 15 psi and the turbos feel like they have a lot more in them but I'm selling my car soon and don't feel like getting it tuned for 17+ psi. SPOautos has BNRs and has trapped at 125 mph on these twins. The 99s won't get you that much power

homie

So far, the info here is great. Apneablue has brought some concrete info with the dyno. 412whp isn't too bad. Maybe 450 whp is asking too much from this great car??

I'm talking to a shop now to talk about installing the two largest turbos that will fit under the hood and figure what kind of hp I can get.

Please keep the feedback coming!
Thanks!

homie

By the way, has anyone had success or experience with the Apex, Greddy, or HKS kits out there?

Thanks,

Mr rx-7 tt

iTrader: (5)

That's uncorrected..

apneablue

You know, I keep asking this question and no on ever gives me a straight answer...

How is it possible to yield more power from Non-Sequential setup than a Sequential setup can from the exact same turbos?

I still can't get it...and still believe most people go non-seq because they were having problems with the sequential setup...

Cihuuy

hmm... wat is a BNR stage 3 turbo?? i kept on reading about it but am not familiar with a BNR... is it a modified type of the stock turbo? sori for the dumb question...

apneablue

Yes...

boost-in-rx7s93

I do not have any sugestions for your upgrade but do you think that I am headed in the right direction? I am about to start forking the cash trying to reach 315 to 350 at the wheels with this setup? will it work?
(rebuilt 13b 2 peice 2 mm for 1500)
(street port for 200)
( hks 72mm donpipe for 225)
va. hose simplification need chart or something though have no clue how to go about the vac. job for I was going to get rid of over half of them by going single plans fell through due to budget!
( NEW! Trust Airinx dual intake filter system for 275)
and I already have a 80mm nurspec exhaust with 3 inch pipe running to stock downpipe, and plan to keep the streight pipe there for the extra expense of a midpipe is not needed right now.

does anyone know of a better set up for stock twins or a better price for these products? I plan to watch the boost guage with both eyes while breaking in the motor so I can save up for either a computer or the apexi avc-r! ( I think taht is what it is called?

once again thinks for the support and sorry to take away form your post!
joe

homie

boost-in-rx7s93,

I dyno'ed at 336whp. You may want to check out my set up described above. My boost is 14.7lbs (1 bar) and this is an everyday driver. good luck!

SPOautos

It was still over 400rwhp corrected, I'd have to visit the dyno to find out exactly(they keep all my runs save on the computer) but it seems like it was 405 or so. Anyway, I dont ever use corrected as uncorrected is the true accurate number. I dont care what someone in Colorado would run with my set up so corrected numbers have no meaning for me. I paid $500 for dyno time to see what my car is making in the area I drive it. Anyway, the correction factors arent very accurate for a turbo car, they are based more on a N/A car.

Also, remember my tuning is very conservative, especially my timing. I'm running a lot of split among other things. I could prob squeeze quite a lot more out of the car with the tuning but I dont feel like spending money and messing with a car thats running so damn good. I aint gonna fix what isnt broken lol

If you check out my trap speed and weight it indicates 430-435rwhp. Which is probably correct as my air intake temps are always much lower on the street versus the dyno. They dyno didnt have the best of fans and I run a smic.

People need to learn your rwhp changes everytime the wind blows, anyone that goes to the dyno and track alot can testify to that. Dyno numbers just give you a ballpark and a idea. They are FAR to easy to manipulate

STEPHEN

artguy

Kwik....the bnrs supposedly put down more power at 17psi than 18 or 19 due to the sweet spot in their peak efficiency range....which is around 17psi

this was what brian told me anyhow....so it seems as if stephen is pulling what he can out of them right now...though brian also told me he expects to do better with his car...im sure he will have numbers for that soon as he seemed to be getting close the last time i spoke with him. we shall wait and see.


j

boost-in-rx7s93

how much did you pay for your greddy intake? Is it a twin filter? I can not find a resonably briced downpipe or intake that I want to go with yet? Thank you for your advise! how did the 336 at the wheels feel like?

thanks, joe