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730rwhp Possible With Twins? Rb26

r33_racer

By r33_racer,
in Engines & Forced Induction

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r33_racer Grand Master

r33_racer

Posted
Posted

Im curious to know if what ive read and been told is bullshit or not. A bloke with a r33 gtst with a rb26 in it with alot of work done reckons with two hks gtxxxx or something arather rated at 360hp each can make 544rwkws or 730hp on a simple and conservative 1.2bar. Assume it has all supporting mods, mild camshafts(done @ tighe cams), std valves, port n polish(course finish, not polished), std manifolds in & out, a fairly thick metal hg, assume cr 8:1, running pump bp 98, motec m800.

I admit my understanding on twin setups like those in gtrs im unfamiliar with but turbos are turbos regardless, to me that amount of power is not accurate. Can anyone explain it or explain their setups if similar and what power they make. Perhaps offer some explanation for it. Not only that but the car can do 1:14s around the national track @ QR and incase people dont know v8 supercars do 1:12-1:13's commonly with quickest time recorded a 1:10 by tander. Whether thats accurate or not i cant say, its only what ive heard.

Im annoyed a little bit that the guy bagged our setup and why his is so perfect is what i want to know cause i cant see it being soo good. This is a information seeking mission but also venting my annoyance.

Cheers.

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https://www.sau.com.au/forums/topic/136148-730rwhp-possible-with-twins-rb26/
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Gav Mentor

Gav

Posted
Posted

If you are referring to low mount turbos, then indeed you've been told rubbish and a simple check of the RB26 Turbo Upgrade thread stickied in this section would have answered your question.

I'm running the largest HKS-GTRS terbs (largest low mounts from HKS) on a fairly seriously built motor and can only achieve mid 500s rwhp.

See:

http://www.skylinesaustralia.com/forums/in...t&p=2137700

Cheers

Gav

r33_racer Grand Master

r33_racer

Posted
  • Author
Posted

Ive been through the 26 section before and seen the power figures...thats why i think its all bull. But i figured well just incase he has a heavier worked motor then say most others and thats why hes achieved that power or something out of the oridinary.

Gav what power are the GTRS rated at?

Obviously different dynos will give different power whether shootout mode or not and so on.

Blitz Grand Master

Blitz

Posted
Posted
Gav what power are the GTRS rated at?

HKS rates them at 400PS each

Gav: What sort of boost were you running to produce ~550rwhp? Sounds like something is holding you back if thats the most you can squeeze out of them

Blitz Grand Master

Blitz

Posted
Posted
Im curious to know if what ive read and been told is bullshit or not. A bloke with a r33 gtst with a rb26 in it with alot of work done reckons with two hks gtxxxx or something arather rated at 360hp each can make 544rwkws or 730hp on a simple and conservative 1.2bar. Assume it has all supporting mods, mild camshafts(done @ tighe cams), std valves, port n polish(course finish, not polished), std manifolds in & out, a fairly thick metal hg, assume cr 8:1, running pump bp 98, motec m800.

I admit my understanding on twin setups like those in gtrs im unfamiliar with but turbos are turbos regardless, to me that amount of power is not accurate. Can anyone explain it or explain their setups if similar and what power they make. Perhaps offer some explanation for it. Not only that but the car can do 1:14s around the national track @ QR and incase people dont know v8 supercars do 1:12-1:13's commonly with quickest time recorded a 1:10 by tander. Whether thats accurate or not i cant say, its only what ive heard.

Im annoyed a little bit that the guy bagged our setup and why his is so perfect is what i want to know cause i cant see it being soo good. This is a information seeking mission but also venting my annoyance.

Cheers.

Over 500rwkw on 1.2 bar? I highly doubt that :)

CruiseLiner Mentor

CruiseLiner

Posted
Posted (edited)

try another tuner gav and u might be suprised ;) with that setup and gtr-s and 28psi i'd expect more. :)

sell the gt rs turbos and go for a single HKS Z and u will need half the boost for the same power :)

Edited by CruiseLiner
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

no chance @ 1.2bar

thats all really :)

It could be possibly with the biggest trust offerings, but not pissy 360hp huffers.

dirtgarage made the power on race fuel dont forget, and around 370-380 on pulp which is the norm for 2530's...

IMO Gav, 2.8l + 28psi and every other nice bit of fruit... it doesnt equal 550rwhp unless something is severly holding you back

Gav Mentor

Gav

Posted
Posted (edited)
try another tuner gav and u might be suprised ;) with that setup and gtr-s and 28psi i'd expect more. :)

sell the gt rs turbos and go for a single HKS Z and u will need half the boost for the same power :)

No - the dyno numbers that I'm producing on the GT-RS terbs are about right compared with others.

I believe DirtGarages's numbers (which are much higher than I've seen others publish) weren't produced on pump fuel from memory (correct me if I'm wrong).

Agree that the single T04Z is indeed a nice bit of kit, but now that I'm set up with the low mounts I'll stay with them. Presently fitting longer duration exhaust cam which should extend the top end some without hopefully not losing too much low down. Very little experimenting with cam timing so far, so should be interesting with some more dyno time.

EDIT: posted at the same time as R31Nismoid regarding race fuel.

The terbs and fuel system are set up for mid 500s awhp, so I really don't feel like I'm being "held back". The extra good bits are really just for reliability and longevity.

What the dyno graph doesn't really convey is the very broad spread of torque available which is what I set out to achieve - the main use being track days and motokhanas.

Cheers

Gav

Edited by Gav
CruiseLiner Mentor

CruiseLiner

Posted
Posted (edited)

pnblight is making those numbers almost (530-540hp from memory) with 2560r turbos and 2.6L bottom end and it aint on 28psi i know that much. and thats on pump fuel too

dirt garage's rb26 was on race fuel yes.

are u running 28psi with pump fuel???

Edited by CruiseLiner
Gav Mentor

Gav

Posted
Posted
pnblight is making those numbers almost (530-540hp from memory) with 2560r turbos and 2.6L bottom end and it aint on 28psi i know that much. and thats on pump fuel too

dirt garage's rb26 was on race fuel yes.

are u running 28psi with pump fuel???

I've only tried pump fuel.

Unfortunately haven't had the opportunity to catch up with Pete (pnblight) and go for a spin yet - hope to early next year when I'm back.

Did drive Adrian's JUN 2.7L with 25/30s fitted. Much of a muchness in response although I did feel that I had a greater top end.

Simon's 2.6L with the Garrett TO4Z is just nuts. Suprisingly, Not much difference in response but just crazy top end response.

Blitz Grand Master

Blitz

Posted
Posted
' date='27 Sep 2006, 07:58 AM' post='2531990']

doing dyno runs the last few days on a top secret car, big mods, and a t88-38k, 22 psi, 432rwkw. oh by the way, did anyone say lag ?

next step is to bottle it so the boost comes on quicker ! boo yah

Hardly surprising when the car is running a T88-38GK on a standard capacity RB26.

Beer Baron Grand Master

Beer Baron

Posted
Posted
' date='27 Sep 2006, 07:58 AM' post='2531990']

doing dyno runs the last few days on a top secret car, big mods, and a t88-38k, 22 psi, 432rwkw. oh by the way, did anyone say lag ?

next step is to bottle it so the boost comes on quicker ! boo yah

that is very interesting but doesn't really have anything to do with this thread now does it? hardly ground breaking news. a T88 GK makes 400kw!!!!111

I think some of you other guys need to let go of your stranglehold on dyno numbers. every dyno is different. if Gav is happy with his power and build then why keep poking at it? i would say his engine build would be one of the more serious ones on here so i dont think it's a matter of him having skimped on it. I don't know of many other HKS 2.8 litre strokers running GT-RS turbos kicking around aus.

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