R34 Gtt Detonation

[B-Boi34]

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

[abr33]

Use something to put in plug hole to see where the top is, like a bit of nylon or carefully with a screwdriver, rock engine back n forth till you establish where tdc is, then compare to your cover marks

[B-Boi34]

I had a good look yesterday & I could not see a mark on the timing cover.

Is it possible to run the car on the dyno & adjust the CAS until the knock is no longer there?

[Odium]

If your tuner doesn't know how to fix this, then get another tuner, immediately...

[B-Boi34]

He isn't my tuner. I just took my car in for a power run & he told me it is pinging.

I'm going to check the timing tonight, hopefully thats where the issue is.

[B-Boi34]

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]

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

[B-Boi34]

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.

[hy_rpm]

Isn't supposed to be 10 degrees

[B-Boi34]

Im pretty sure its 15