What Turbo Is Best For Stock 33 Motor For Max Power

[bradsm87]

I think the GT-RS has a way to small exhaust side for an RB25. Massive back-pressure up-top.

The ultimate bolt-on responsive turbo for the RB25 has gotta be the HKS GT2835 Pro S bolt-on kit.

http://www.hks-power.co.jp/products/turbo/...o/ac_gtpro.html

It's pretty much the spot-on size in both the compressor side and the turbine side.

[joeyjoejoejuniorshabadoo]

i have to agree there...

mine hits full boost at 32-3500 and stays on till my 7400 redline...

i have an exhaust cam gear to bring it on earlier (at the exoense of like 10rwkw up top) and the car is an animal

[PM-R33]

Guess depends on if you wanna drive round or sit at home jacking off over dyno sheets...

You could combine the two....

Maybe that's why some people carry a dyno sheet in the glove box, all makes sense now!!

[dangerman4]

Just reading through this and you need to ask yourself do u want responsive power or laggy as hell.

I agree with hks gtr-s or 25/35 (30) for responsive power although may not pull the higher figures.

Guess depends on if you wanna drive round or sit at home jacking off over dyno sheets...

what a crock of shit.

i have a 3582r with a .82 rear and and i can see 24 psi by 4k

most of the other figures quoted from the other turbos in this thread are all full boost somwhere in the 3k - 3.5k range

and you will find 90% of gt30 size turbos are all gonna be around the 4k mark as well.

so what do you call laggy as hell?

imo do it once and do it properly

a gt3582r/iw will fit low mounted no worries, running at 15 psi you will make between 250 - 270 rwkws.

if the motor gets rebuilt then up the boost and make 350rwkws.

the thread title has been answered you make up your mind what your looking for.

remember guys you can build a mental set up and just detune it for reliability.

[wolverine]

i have a GT-RS and a GT3040 and there is no doubt the GT-RS is the more responsive turbo. increases in throttle application generally you get more instant joy out of the GT-RS.

however, the GT3040 (aka GT3082) isn't too shabby to drive around, it needs a few more revs onboard but makes much more power once it is going. ultimately the compressor will be choked by the turbine on this version but it is a pretty good thing. so i am guessing it will feel not too dissimilar to a GT3582 at 75-80% of its max.

personally, i think something that can make 270-300rwkw for a rear wheel drive car is the best bet. this is about the limit of traction on road tyres and inside a power level for keep the stock engine chugging along for a while with good tuning.

so that means GT3076 sized turbo if funds permit with the addition of a merge collector manifold you can bring the boost threshold down.

[Dragonforce]

GT3076 ftmfw

[mattsr31]

so that means GT3076 sized turbo if funds permit with the addition of a merge collector manifold you can bring the boost threshold down.

so many people say that turbo is the go mate what u mean by merge collector manifold

[PM-R33]

Means something like a 6boost manifold.

[toffy]

trust td06 l2 20g their maximum efficiency is right on the limit of a stock rb25 imo

[mattsr31]

what are they worth mate

[teng]

How about the HKS GT2540? I don't see many people talking about this turbo. It's a direct bolt on as well to the RB25 Engine.

[Lithium]

How about the HKS GT2540? I don't see many people talking about this turbo. It's a direct bolt on as well to the RB25 Engine.

Probably because they are the laggiest turbo for the power they make and the cost to obtain them and I'm not sure HKS even make them anymore so the odds are that one you buy will be many years and kms old.

GT3076R as stated, is ftmfw

[Adriano]

Because they arecrap, way too laggy for the power that they produce, due to the mismatch of wheel sizes

[joeyjoejoejuniorshabadoo]

search the 2540 and you'll see why

[teng]

Because they arecrap, way too laggy for the power that they produce, due to the mismatch of wheel sizes

I see. Understood. lol

[toffy]

what are they worth mate

i have nfi to be honest, best to find one in kit form so its all nice and easy to bolt up , iv'e seen them as low as $1200 for the rb kit 2nd hand (the turbo is easily rebuildable). dr drift was looking into getting copies fairly cheap , it might pay to email him (he made 300+rwk with one, its in the rb25 upgrade thread)

Edited December 27, 2008 by toffy

[toffy]

here ya go , his exact words on his

Want to make a few changes, upgrade radiator and maybe some coilovers, and the gearbox is whining after the weekend... Will try and make next day at Basky!

As for the L2, yes it's an EXACT copy... we've completely pulled the turbo apart and put it side by side with a genuine L2 and you CANNOT spot the difference...

Response on the 25 is pretty stupid, and I haven't even hooked up the VCT!! More to be had

Pulled the intake pipe off this aftenoon, and with over 1000km now on it (most of it HARD) there is absolutely no signs of wear at all!

I'm negotiating direct with manafacturer to try and get these in a bit cheaper, but I'm going to have to order min 10 pcs!

Edited December 27, 2008 by toffy

[Dr_Drift]

Assuming he does not take it to drag/drift/track days every weekend and keeps away from the rev limiter and a host of other variables that will kill an engine that is on the limit.

My 25 only sees drag/drift/limiter... But I do concede it seems abnormal for a stock 25 to make 305 rwkw reliably with 25 psi copy L2 and other budget bolt ons!

trust td06 l2 20g their maximum efficiency is right on the limit of a stock rb25 imo

Hell, even push them past their max efficiency... they just sing!

[mattsr31]

what are garrett 3082r like are they more laggy then a 3076r

turbo is rated at 600hp front cover is Ar .70 and .63 rear for quicker spooling

what would u pay for a second hand one

[Bliksem]

Yes they are known to have more lag...