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R34 Gtt Detonation

B-Boi34

By B-Boi34,
in Engines & Forced Induction

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B-Boi34 Community Regular

B-Boi34

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Posted

Hi Guys

I put my car on a dyno yesterday & was told its pinging right at the top of the rev range.

Its pretty much standard apart from exhaust, filter & boost controller which was set on 8psi for the run.

I suspect its pinging due to the timing being out. The fuel to air ratio was fine at 11.2 pretty much all along the rev range.

My question is can any one confirm if the plastic R34gtt bottom timing cover is different to the metal ones previously used on 32 & 33's.

The reason I ask is my plastic cover was removed because it warped & was hitting the pulley. It was replaced with a metal cover & im thinking if the metal cover's timing marks are different then my timing would be out.

Thanks in advance

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  • 2 weeks later...
B-Boi34 Community Regular

B-Boi34

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Ok so I put the car back on the dyno, the timing is set at 15 degrees btdc however it still pings right at the top of the rev range with any thing over stock boost.

In fact anything over 6psi. It appears by turbo/wastegate is stuffed as it will not hold boost. Starts at 8psi & drops to 6 but thats a different issue.

The tuner recommends I get a FMIC as im still running the factory SMIC.

Has any one had this problem before or have any idea what the problem could be?

Tonks Community Regular

Tonks

Posted
Posted

The SMIC wouldnt be too efficient at 12psi, fit the FMIC and go from there. You need supporting mods before start winding boost up. Have a look at the rb25 turbo/dyno result thread and see everyone elses supporting mods to get an idea

  • 5 months later...
B-Boi34 Community Regular

B-Boi34

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So just encase anyone finds themselves with the same issue it was the SMIC that was causing the detonation, apparently its not good for up to 200RWKW as iv read elsewhere.

FMIC fitted & no more detonation, it also gave me a 30rwhp increase.

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