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Rb25 Turbo On Rb20 Question

R TUNE

By R TUNE,
in Engines & Forced Induction

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R TUNE Mentor

R TUNE

Posted
Posted

Ok just put a 45v2 turbo (rb25 series 2) on to my r32 Rb20 and a 3" front and dump pipe.

Tuner is a idiot and had the boost set at 5psi but still made 2rwkws more than the rb20 turbo at 12psi.

When i got the dyno sheet the AFR starts at 13.5:1 and dumps to 11:1 at around 5500rpm.

the bottom end of the power graph is a bit lazy.

Just wondering apart from getting a new ecu and retuning it, is their any other way of richerning the AFR?

I also have the following.

RS*R 3" cat back

drift pod filter

turbo tech boost controller.

I do wont to run it at 12PSI

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https://www.sau.com.au/forums/topic/326549-rb25-turbo-on-rb20-question/
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GTScotT Grand Master

GTScotT

Posted
Posted

If its the stock ecu, it will richen up as you turn the boost up.

But the question is why do you want it richer? 13:1 when spooling sounds ok and 11:1 on full song is pretty good to be honest.

GTScotT Grand Master

GTScotT

Posted
Posted
sounds like its too rich already. turn the boost up and do a power run to make sure its safe.

13:1 and 11:1 too rich? Are you sure?

You might be surprised when asking real tuners their opinion on 12:1 AFRs.

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