Page updated on 05-23-2018


03-04-2004, 08:06 AM
i want to know whats the max psi i can go with rb20dett as standerd and i want to end with 350hp with standerd too..

03-04-2004, 09:42 AM
Ok is it in a skyline or another car?

What ecu are you using?

any other mods such as exhaust and filters?

03-04-2004, 10:43 AM
Ok is it in a skyline or another car?

What ecu are you using?

any other mods such as exhaust and filters?

yes in a skyline, standerd ecu, with filters and im trying to find an exhaust if u can tell me which one is good for me.
thanx for reply.......

03-04-2004, 07:14 PM
As far as the engine you're saying it's an RB20DETT, is it actually a twin turbo? If so, it's not a stock RB20, which is single turbo. Or did you accidently put RB20 and mean RB26, basically, is the Skyline a GTR or GTS-t? Just trying to clarify the engine, if you have the RB20, it only comes factory with a single turbo and is the RB20DET. Now, it could be twin turbo if someone installed the GTR's exhaust manifold on it and twin turbo'd it.

Anyways, the max (recommended) PSI you can run on a standard RB20 is .9 to 1 bar which equates to ~ 13 to 14.5 psi. Now I've seen people that have boosted it up to 1.2 bar on a stock engine which is about 17.5 psi. However, it is highly recommended that you do not want to exceed 14 psi! Odds are your engine will run to lean over that and start melting pistons.

If you want anything over 14, you need to start changing parts on the engine... injectors, fuel pump and remap your ecu at a minimum! But to ensure your engine lasts longer and runs safer, add these to the list... Air Flow Sensor or add on signal convertor, fuel pressure regulator, upgraded/hybrid turbo and larger intercooler. Provided I din't miss anything, this should be able to take you up to ~18 psi safely.
I would also recommend installing a metal head gasket also, which is thicker and lowers your compression. You can get away without it up to 18psi, but definitely required if you go over that along with other internal modifications to the engine.

03-04-2004, 09:03 PM
thanx for reply..
ahaaa my r32 is gts-t 1992 and its singel turbo....
im thinking to add fuel pump, injectors, exhaust, an intercooler and A/f meter.
i want to know what do u mean by remap my ecu?
thanx agine

03-05-2004, 04:52 AM
What an ECU remap is, when you change injectors for example.

Your stock injectors are 270cc. When your engines running, it's getting signals from the ecu when to open, for how long, etc.
Now, when you upgrade injectors, to 550cc for example, the ecu does only what it's programed to do. So it's giving the larger injector the same signal of when to open, how long, etc. This translates into to engine not running correctly, if at all.

So, what you'd have do, is take your stock ecu to a tuning shop that can retune/reprogram them. They 'remap' the new values in it so that the ecu can now send the correct signals to use the new injectors.

There are other options then remapping the ecu. In this case, you could buy an Injector controler that goes between the ecu and the injectors and changes the old signal from the ECU to the new signal the injectors need to be used properly. Also, there are aftermarket ecu add on engine management systems (such as greddy eManage) and ecu replacement options (Apexi Power FC).

I hope this helps you out. It can be confusing.

03-05-2004, 10:16 PM
thank u vary much for the info that u gave me..
its realy help me out thanx agine.....

03-05-2004, 11:12 PM
by the way how much it will cost me to retune the ecu... thanx

03-06-2004, 05:48 AM
I'm sorry to say I don't know how much a retune costs down there. The best thing to do is find some car tuning shops and ask around.

Sorry I couldn't help with that one.

03-06-2004, 08:58 AM
No worries mate.....

Add your comment to this topic!