High Knock Count

[tacker]

Guys,

last track day i lowered the rev limit to 7400 as i was running 1 bar boost up from .85 on the standard GTR R32 turbos ( being replace now :-) )

But i did notice a jump in the knock count and i was wondering if hitting the rev limiter could also make the ECU consider that misfire as knock.

any theories?

[Strik3r]

well you increased the boost so maybe the tune wasnt injecting enough fuel for the increased air flow and therefore you got knocking ? took a bit of a gamble running your turbo's @ 1 bar ;o i wouldnt want to risk sending ceramic dust through my engine if i had a godzilla

[djr81]

Guys,

last track day i lowered the rev limit to 7400 as i was running 1 bar boost up from .85 on the standard GTR R32 turbos ( being replace now :-) )

But i did notice a jump in the knock count and i was wondering if hitting the rev limiter could also make the ECU consider that misfire as knock.

any theories?

Well given that crunching synchros can sometimes confuse the damn things into thinking it has a knock anything is possible.

Nonetheless don't go looking for excuses. Check your knock values either on a dyno or log them properly. It is not worth an engine...

[700HP-GTR33]

Guys,

last track day i lowered the rev limit to 7400 as i was running 1 bar boost up from .85 on the standard GTR R32 turbos ( being replace now :-) )

But i did notice a jump in the knock count and i was wondering if hitting the rev limiter could also make the ECU consider that misfire as knock.

any theories?

Lowering timing values even by one degree half the knock count.

Sure also can be the gears sending vibes threw.

What sort of computer do you have?

You can take notes as you drive....if you have a map tracer.

Then alter timing lower by a degree...that will solve your problems.

[djr81]

If it is a power FC it is dead easy to remove 1 degree from the timing.

[tacker]

correct i did increase the boost and first few runs were fine less than 20.

Was only when i was late on a gear change during a session and hit the rev limiter ( engine light flashed at that time ) that i had a high knock count.

pleanty of fuel as the wide band never got over 11.5