Thoughts On R25 On Eflex Vs The Rb30 Route .

[discopotato03]

A very rough quote to supply a complete RB30 short with better rods pistons and collar was around five grand , in your lap BTY . Not sure about R/R and anything needed to make it happen thats not a straight bolt up/in .

Cost wise throwing in say a Link/ViPec plug in with any wiring/sensor work and turning probably adds another dunno 2-2.5G ? The PFC and Datalogit can be sold to offset some of this .

I like the idea of not having the ethanol variation hassle and being able to find a performance/consumption trade off would be great . Can run the highways on PULP and use the grog when its available .

The only downside I can think of for E85 or Eflex is the 15-40% petrol they add - 91 octane powere Kero I suppose . Shame its possibly not easy to get E100 and throw in your own PULP .

I hear that good tuners can get you emissions compliant with a reasonable cat too .

GTRS , interesting to see what these would be like on a cleaned up 25 with jungle juice . Should make some reasonably fierce low to mid range torque and maybe top out at say 270 Kw if the exhaust and intercooling could manage it .

A .

[AngryRB]

Plenty of people run the stock RB30 bottom end to 7000rpm... I mean really your making the power like 1000rpm sooner so you end up still having a larger power spread, which is basically the whole point of doing rb30 lol

Anyway my vote is for both but if your sticking with the GTRS then its probably not worth the extra hassle for the 3L..

dont know if that would be safe/reliable, i asked my tuner when my car was being tuned and he was of the opinion that the crankshaft on an RB30 doesnt suit 7000rpm and should not reliably be pushed like that... dont want to start a debate on this, i would only consider doing it the safe way and not pushing limits that are not safe...

i would imagine that GTRS would be an absolute response monster with ethanol...

is it not being a bit overkill looking for computers to run varying ethanol content?? my tuner was quite happy with tuning it on flex and allowing me to monitor knock levels for changing mixtures.. he suggested if i was concerned about the summer mix being different i could come back for a quick run on the dyno to check the tune.. which i will do in order to look after the engine..

[wolverine]

A very rough quote to supply a complete RB30 short with better rods pistons and collar was around five grand , in your lap BTY . Not sure about R/R and anything needed to make it happen thats not a straight bolt up/in .

Cost wise throwing in say a Link/ViPec plug in with any wiring/sensor work and turning probably adds another dunno 2-2.5G ? The PFC and Datalogit can be sold to offset some of this .

I like the idea of not having the ethanol variation hassle and being able to find a performance/consumption trade off would be great . Can run the highways on PULP and use the grog when its available .

The only downside I can think of for E85 or Eflex is the 15-40% petrol they add - 91 octane powere Kero I suppose . Shame its possibly not easy to get E100 and throw in your own PULP .

I hear that good tuners can get you emissions compliant with a reasonable cat too .

GTRS , interesting to see what these would be like on a cleaned up 25 with jungle juice . Should make some reasonably fierce low to mid range torque and maybe top out at say 270 Kw if the exhaust and intercooling could manage it .

A .

98RON + GT-RS = grouse

E85 + Gt-RS = super-grouse

[discopotato03]

Yeah I think 260-270 would be plenty and a GTRS looks so innocent compared to a GT3076R .

Everyone reckons the Link/Vipec runs an RB25 a bit smoother than a PFC and that auto tune thing looks intersting

Will talk to SK and Scotty K soon .

A ..

[ARTZ]

Yeah would live to see a gtrs on e85..theres a brand new one for sale here too..full kit with apexi intake save yourself a few bucks ..

[GTScotT]

hes got a gtrs already

scchhnaaap

but if u do go 30, dont stop there.... juice it with a biiiig turbo lol

[R32Abuser]

Disco, I assume its for the street since you mentioned being emissions compliant?

If so, I'd go RB30DET + E85 Flex Fuel...

IMO The redline limit on the motor is close to being irrelevant for this application. As previsouly mentioned, having the extra capcity increases the usable rev-range of the motor. You can turn RB30's to higher RPM limits, you just need to make the proper modifications (Balancer, pump etc.). In any case, if your spending that much time on the street near your limiter, you deserve to have your license taken away from you.

My biggest issue with my setup is not being able to put the power I have down to the ground. R32 GTST RB30DET with ~280RWKW is quite a handfull at times. That said, I need to get a decent set of street semi's and a 1.5 Way C-LSD.

Edited August 14, 2012 by R32Abuser

[wolverine]

I completely understand going for an RB30 on a GTR and Stagea due to the extra weight of the car.

The GTS-t just isn't that heavy, E85/flex fuel setup is so much cheaper and will be grip limited everywhere with a GT-RS.

[zebra]

imo GT-RS + 3L will be rubbish and be falling over at 5k rpm without making anymore power than what the 25 can do

Disco, whack a good intercooler on and up the boost with the 98 tune, if you are concerned about legalities than get a Blitz turn flow thing, factory intercoolers are rubbish unless its off a Rb26...hell my JZA70 intercooler is 3x (if not more) the size of a 34 side mount and its holding me back at near stock power

or for even less money than E85 there is WMI

[R32Abuser]

I agree in terms of weight. Although you can't beat power to weight, there is still a massive limit to what you can practically put to the ground without comprimising other areas of the car (excessive squat etc etc.)

I also agree at the cost aspect. However, apples for apples, there is a significant difference between driving an RB30 vs RB25. I've found the RB30 to be a more "streetable" motor. If you want to take off from the lights quickly, you dont need to stall the car up and look like a hoon or rev the thing to 5000RPM. Just torque away, barely getting on boost.

Zebra, by no means would I be chucking a GT-RS at an RB30. I'd be chucking a GT3076R on it or equivelent. Smaller than that and the thing chokes up. Larger and you start to lose the response you were after in the first place.

Edited August 15, 2012 by R32Abuser

[Dose Pipe Sutututu]

imo GT-RS + 3L will be rubbish and be falling over at 5k rpm without making anymore power than what the 25 can do

Disco, whack a good intercooler on and up the boost with the 98 tune, if you are concerned about legalities than get a Blitz turn flow thing, factory intercoolers are rubbish unless its off a Rb26...hell my JZA70 intercooler is 3x (if not more) the size of a 34 side mount and its holding me back at near stock power

or for even less money than E85 there is WMI

He's not going to listen to you.

[AngryRB]

I agree in terms of weight. Although you can't beat power to weight, there is still a massive limit to what you can practically put to the ground without comprimising other areas of the car (excessive squat etc etc.)

I also agree at the cost aspect. However, apples for apples, there is a significant difference between driving an RB30 vs RB25. I've found the RB30 to be a more "streetable" motor. If you want to take off from the lights quickly, you dont need to stall the car up and look like a hoon or rev the thing to 5000RPM. Just torque away, barely getting on boost.

Zebra, by no means would I be chucking a GT-RS at an RB30. I'd be chucking a GT3076R on it or equivelent. Smaller than that and the thing chokes up. Larger and you start to lose the response you were after in the first place.

definitely this, would make an awesome 300kw with RB30/25 GT3076 0.6 rear and E85 , be loving traffic light take off's on lowish revs

Edited August 15, 2012 by SliverS2

[R32Abuser]

definitely this, would make an awesome 300kw with RB30/25 GT3076 0.6 rear and E85 , be loving traffic light take off's on lowish revs

0.63 is too small IMO.

See:

http://www.skylinesaustralia.com/forums/topic/405332-3076r-on-2630/page__view__findpost__p__6463026

Simons RB26/30 with Std cams, E85, GT3076R 0.63 A/R etc. chokes up top. All over by about 5750RPM. Bare in mind that graph is on a hub-pack dyno not a roller...

My GT3076R 0.82 A/R is still making power upto 6100 RPM but we ran out of fuel pump/injectors/AFM to do anything more. Makes ~230RWKW @ 4000RPM and peaks 281RWKW @ 6100 RPM. It's probably capable of 300RWKW with a bit of fuel/AFM and a psi or two...but who cares!

[TiTAN]

do NOT go 3L with a GTRS turbo.

GT30 with 0.82 rear minimum for a 3L or it chokes the top end massively and you end up making all of 80kw at 7000.

[AngryRB]

0.63 is too small IMO.

See:

http://www.skylinesa...ost__p__6463026

Simons RB26/30 with Std cams, E85, GT3076R 0.63 A/R etc. chokes up top. All over by about 5750RPM. Bare in mind that graph is on a hub-pack dyno not a roller...

My GT3076R 0.82 A/R is still making power upto 6100 RPM but we ran out of fuel pump/injectors/AFM to do anything more. Makes ~230RWKW @ 4000RPM and peaks 281RWKW @ 6100 RPM. It's probably capable of 300RWKW with a bit of fuel/AFM and a psi or two...but who cares!

he said he wants "fierce low to mid range torque and maybe top out at say 270 Kw" , which is more 0.63 territory isnt it??

Edited August 15, 2012 by SliverS2

[Mitcho_7]

In terms of cost to performance e85 on an rb25 would have to be the clear winner. Much easier to do as well and it'll make a wild street setup with a gtrs

[zebra]

he said he wants "fierce low to mid range torque and maybe top out at say 270 Kw" , which is more 0.63 territory isnt it??

problem is that it would have the usable rev range of a turbo diesel

[Mitcho_7]

A well setup .82 gt3076 with an external gate is still pretty responsive on a stock rb25. I guess it's different strokes for different folks and everyone has different definitions and requirements for response.

Edited August 15, 2012 by Mitcho_7

[AngryRB]

ive always thought the vl turbo's were the ultimate in response for the street, on song at 2000rpm and strong... had longer gears too

had a ride in a modded one few years ago ,( 13flat quarter) pulled hard from 1200rpm to the redline.. for the street that in my opinion is the ultimate responsive weapon, city street need low rev pull to have fun.. setups where nothing happens till 3500-4000rpm are bit hard to enjoy on short city streets..but each to there own..

Edited August 15, 2012 by SliverS2

[R32Abuser]

problem is that it would have the usable rev range of a turbo diesel

+1

My set-up already feels like it has the torque curve of a V8.