knock when revving

[sk8freak8989]

I have a 1990 gsx with a small 16g, 650 injectors, FMIC, a 2g MAF and dsm link. I am in the process of tuning it but i am having a wierd problem. I did a couple third gear pulls and everything is in line. I have a afr around 11.1 at WOT and i am only geting between 3-5 counts of knock. Then when i just put the car in neutral and rev it up to rev limit i get about 15 counts of knock. The car also builds about 10psi of boost just reving. Does anyone know what the problem could be.

thanks

 

[MichaelSuch]

We need a log, there's a lot of variables. You could try lowering your timing some though.

 

[sk8freak8989]

Anti lag is turned off and my wide band is around 12-11.3 when revving. Also it will have the knock and build the boost before i hit the rev limit.

here is a log, it shows me revving it then a third gear pull at the end.

 

[garner]

Something is wrong with the motor. What octane fuel are you running? Have you tried changing the tune to be safer?

 

[sk8freak8989]

I don't think anything is wrong with the motor because the car runs and drives fine. I am running 93 for gas.

 

[garner]

I don't think anything is wrong with the motor because the car runs and drives fine. I am running 93 for gas.

Knocking is a sign of detonation(blowing the motor). Try some higher octane fuel or try a safer tune

 

[sk8freak8989]

I also forgot to mention that when i rev it it always makes 15.1 counts for knock. Could this just be phantom knock?

 

[98DiamondStar]

Knocking is a sign of detonation(blowing the motor). Try some higher octane fuel or try a safer tune

Knock (Detonation) is not blowing the engine, it's just fuel detonating prematurely, Higher octane fuel? 93 is as good as it gets man.

 

[dsmpat95]

Could be, lower your timing a little and see if it helps.

 

[sk8freak8989]

Ive already tried lowering the timing and it does not make any difference, it is still making 15.1 counts of knock.

 

[Below Ambient]

sounds like phantom knock but i would make sure by running a map with injector correction only and see if you still get knock... Ive tuned a few cars on link and always had to kill knock below 3500