GTR Detonation

[JayDee]

I removed the brass boost restrictor from my R32 GTR and boost raised from about 11psi to about 13psi according to my digital boost guage. At standard boost it was dynoed and had near perfect AF ratios(indicated by the performance shop)

At standard boost the car runs very well and has no signs of detonation but when boosted as above I am getting detonation(hear pinging) under load.

The car is standard as far as I know other than full turbo back 3 inch exhaust and a Mines tuned standard computer.

Everone says that you can remove the restrictor with no issues(other than coming close to ceramic limit) but no-one has mentioned detonation. Could it be that the computer was tuned to a fine limit in Japan at standard boost and increasing it at all is causing detonation(also Japanese fuel has higher octane as I understand).

Any ideas as I would like a bit more boost without adding a PowerFC?

[jayR33]

I'd go and get the AFR's checked out at the higher boost levels, but i'd have to say that the Mines computer isn't doing your engine any favours on Australian fuel, especially at higher boost levels.

If you want more boost, you should really look at changing ECUs (maybe revert to a standard computer) or even testing different fuels.

[rb25]

Change ECU's mate, detonation will kill an RB very quickly.

-rb25

[meggala]

the ecu is probably fine tuned for fro 103 ron fuel. you might have to retatd the timing on the cas I would get this doen on a dyno other thing is the fuel pump could be on the way out

meggala