rb25 twin turbo set up

[bigcarl]

twin 350hp garret turbos on rb25. a question , can it be done? can stock gtr manifols be used on the rb25 head? has anyone done it? what sort of response would i get on rb25/ rb30? what rwkws at what boost?

[Trust33]

It has been done b4 on a rb25det by someone on these forums.

[strutto]

Nismo_Boy to be exact...

[HR31_RB20DET]

Stock GTR ex. manifold cannot be used on a RB25 head.

[bigcarl]

has nismo boy written any posts, ive done the search can find anything.

[strutto]

Hmmm I don't remember any technical post's about it to be honest...

There are some pics here though: http://www.qldstreetcar.com/forum/index.ph...topic=2759&st=0

Perhaps send him a PM?

[predator]

guy who I bought my engine off had another RB25 running twin turbos in a VL.. went pretty well he said...

can be done... people are a bit dismissive of it, but if done correctly I think it can be a good combination.

[Nismo_Boy]

Having done the conversion, I would IMHO save your money and build a monster single. But on the other hand I went twin turbo to be different. So each to their own

We used GTR manifolds. They won’t fit at all. You will need to cut the flanges off, and re-weld on to suit the rb25. (Not a big deal).

Turbo’s were rebuilt HKS 25/30’s. Started to pull really hard around 3800rpm, and went all the way to red line – 8500rpmish from memory.

As the motor was in a Silvia, the pipe work was a bitch, and heat was a major issue having the two low mounted. Not knowing what car you wish to do this conversion in, I can’t really comment.

Cost for cost building an rb25/rb30 hybrid with a single would be cheaper. I wont say the price of my motor but think in the field of $25k++ with its support gear.

Power was around the 600rwhp on c16. Ran 10.8 @ 127mph with the brakes on hard half-track to stop braking out, but still did. At a guess it should have been an under 10.5 car. Will never know as the car is now sold.

All the mod’s as follow;

1994 Rb25. Taken out to 2.6lt.

Forged pistons to suit.

Compression changed to suit pistons.

Fully balanced.

O ringed block.

Major head work/polished.

275 HKS cams.

Custom cam gears.

N1 Oil pump.

Q45 throttle body.

Custom aluminum radiator.

Custom FMIC.

Greddy BOV.

Power FC with hand controller.

Apexi boost controller.

HKS 2530 turbo’s.

HKS dump pipes.

GTR front pipes.

GTR twin turbo manifold, and pipe work.

HKS 4inch super dragger exhaust.

1000cc Sard injectors.

300zx AFM.

Apexi pod filter.

3/8 fuel lines.

Big competition fuel filter.

Malpassi fuel regulator.

Berry clutch. 3800pounds

Greddy inlet manifold.

Twin 12inch thermos.

GTR master cylinder. (Brake and clutch)

Im sure there is more, But its been a damn long time since I've had to think what the car had.

Josh.

[bigcarl]

what boost were you running to achieve that? reason im considering doing twin turbo set up is because i have a friend willing to give up his twins that he put aside for his porsche but now wants 900hp, so they are too small for what he know wants.

[Nismo_Boy]

600hp on c16 was on 1.8bar off hand.

10.8 1/4 run was on 1.2bar or 1.3 bar