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Can A Rb20 Push 400Hp(Not Wheel) With A Good Response?

yoshiii335

By yoshiii335,
in Engines & Forced Induction

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yoshiii335 Rising Star

yoshiii335

Posted
Posted

Hello

Ive read about all kinds of turbos for the rb20 and some of the results.

Can a rb20 be built to push 400 hp(not wheel) with good response for street?

I was thinking about having the 25 or 20 turbo highflowed by Raw Brokrage back in the states.

Or maybe buying the HKS GTRS.

It will be cheaper to build the rb 20 here in Japan because if I change to a rb25 or 26, the yearly taxes go up pretty high for the change.

My car is a r32 gts-t.

iruvyouskyrine Grand Master

iruvyouskyrine

Posted
Posted

Yes it can be done.

You need an RB26 crank though to bring it up to 2.4L.

That is the only way you can make a responsive 400hp RB20 unfortunately for you. Your best bet is to high flow you standard or RB25 turbo and be happy with that as it's about the best you will achieve as a happy medium.

yoshiii335 Rising Star

yoshiii335

Posted
  • Author
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Yes it can be done.

You need an RB26 crank though to bring it up to 2.4L.

That is the only way you can make a responsive 400hp RB20 unfortunately for you. Your best bet is to high flow you standard or RB25 turbo and be happy with that as it's about the best you will achieve as a happy medium.

Yes it can be done.

You need an RB26 crank though to bring it up to 2.4L.

That is the only way you can make a responsive 400hp RB20 unfortunately for you. Your best bet is to high flow you standard or RB25 turbo and be happy with that as it's about the best you will achieve as a happy medium.

So that means I would have to bore out the engine?

What about the HKS 2835 or GTRS?

Lithium Grand Master

Lithium

Posted
Posted

I'd have thought a Garrett GTX2860R with an internally gated .63a/r T3 turbine housing (for GT28 wheel - I have in my head those are available now?!) on stock manifolds and a hearty dose of boost would do it on good fuel etc. If you have the money to upgrade manifold(s) and maybe do cams then I'd have thought with modern turbos it would be pretty easily achieveable, depending on what you call responsive.

yoshiii335 Rising Star

yoshiii335

Posted
  • Author
Posted (edited)

I'd have thought a Garrett GTX2860R with an internally gated .63a/r T3 turbine housing (for GT28 wheel - I have in my head those are available now?!) on stock manifolds and a hearty dose of boost would do it on good fuel etc. If you have the money to upgrade manifold(s) and maybe do cams then I'd have thought with modern turbos it would be pretty easily achieveable, depending on what you call responsive.

I was thinking about upgrading cams and going with the front facing plenum.

Edited by yoshiii335
Lithium Grand Master

Lithium

Posted
Posted

Depending on what you want to spend, there are definitely ways of doing it imho. If you wanted to get fancy you could probably do a custom small tube (~28mm ID?) exhaust manifold with a turbo in the 40lb/min range etc then things should be able to get exciting. If you are worried about down low torque/response I'd probably be wary of manifolds which replace or go aggressive on the inlet manifold runner size too, RB20s don't need much of an excuse to get weak down low so try not to give it any.

GTSBoy Grand Master

GTSBoy

Posted
Posted

Is this with the stock turbo normal or rb25 turbo normal or highflowed for both?

Or is this with a boost controller?

Yes, that is 100% stock engine with the boost turned up to 14 psi. OK, you should have a front mount cooler and a good exhaust on it too, but these things are taken for granted as being on all Skylines.

You don't need cams, although they can help you make more up top (with less response down low).

You don't need, or want an FFP. They are a waste of time.

I wound up my R32 to about 14-15 psi on stock management and got about 165 rwkW, which is nearly 300 HP. Tuned the ECU and it went up over 170rwkW which is pretty much spot on 300, but with less boost, about 12.5 psi. This is because that sort of power is where pretty much everything maxes out - injectors, air flow meter, turbo flow.

To get to 400 engine HP all you need is a lot more boost (and supporting mods to fuel supply, turbo obviously, management).

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

FWIW, drop in a RB25DET with a basic high flow.. overall this will cost less at the end of the day/build.

I've had my fair share of RB20s back in the day, however even a SR20 makes more torque, power and response for less.

yoshiii335 Rising Star

yoshiii335

Posted
  • Author
Posted

FWIW, drop in a RB25DET with a basic high flow.. overall this will cost less at the end of the day/build.

I've had my fair share of RB20s back in the day, however even a SR20 makes more torque, power and response for less.

Thanks for the advice. I would but it would cost too much in yearly road taxes to get that engine as well as having to reregister it with the change and have to pay more money.

yoshiii335 Rising Star

yoshiii335

Posted
  • Author
Posted

Depending on what you want to spend, there are definitely ways of doing it imho. If you wanted to get fancy you could probably do a custom small tube (~28mm ID?) exhaust manifold with a turbo in the 40lb/min range etc then things should be able to get exciting. If you are worried about down low torque/response I'd probably be wary of manifolds which replace or go aggressive on the inlet manifold runner size too, RB20s don't need much of an excuse to get weak down low so try not to give it any.

Depending on what you want to spend, there are definitely ways of doing it imho. If you wanted to get fancy you could probably do a custom small tube (~28mm ID?) exhaust manifold with a turbo in the 40lb/min range etc then things should be able to get exciting. If you are worried about down low torque/response I'd probably be wary of manifolds which replace or go aggressive on the inlet manifold runner size too, RB20s don't need much of an excuse to get weak down low so try not to give it any.

Can you explain more about the turbos please. I am new to this so the figures you are giving me I dont really understand.

CEF33Y Experienced

CEF33Y

Posted
Posted

All comes down to what you think good response is.

My RB20 makes 240rwkw (probs 380ish? hp at motor), full boost at 4800rpm. I like it, my mates with SR20's hate it.

My result is with mostly stock motor (unopened), turbo (highflowed neo), fuel system, exhaust, cooler and nistune. Still have stock manifolds and airbox.

Any RB20 making 400hp wont be doing much below 4000rpm.

yoshiii335 Rising Star

yoshiii335

Posted
  • Author
Posted

All comes down to what you think good response is.

My RB20 makes 240rwkw (probs 380ish? hp at motor), full boost at 4800rpm. I like it, my mates with SR20's hate it.

My result is with mostly stock motor (unopened), turbo (highflowed neo), fuel system, exhaust, cooler and nistune. Still have stock manifolds and airbox.

Any RB20 making 400hp wont be doing much below 4000rpm.

ohhhh would aftermarket cams and adjustable cam gears help with that? Getting something before 4000 rpm?

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