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Getting rid of knock at high rpms

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Old May 29, 2015, 09:59 AM
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Getting rid of knock at high rpms

I've been seeing knock counts at the top of 3rd gear and 4th gear ever since it warmed up outside. It was fine in the winter. Car is tuned on 93 octane 27/28 psi on FP red with 1000cc injectors. Tuner isn't responding in a timely manner to fix it so I plan to just play around with it myself. Is it best to drop boost and increase timing or trying leaving boost where it is and richening mixture? I'm getting around 11.1-11.2 the way it is now at WOT. I don't want to lose too much power and the car is knock free in 2nd gear. Using Grimspeed for boost control.

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Old Jun 1, 2015, 10:39 AM
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Originally Posted by 1fast97gsx
I've been seeing knock counts at the top of 3rd gear and 4th gear ever since it warmed up outside. It was fine in the winter. Car is tuned on 93 octane 27/28 psi on FP red with 1000cc injectors. Tuner isn't responding in a timely manner to fix it so I plan to just play around with it myself. Is it best to drop boost and increase timing or trying leaving boost where it is and richening mixture? I'm getting around 11.1-11.2 the way it is now at WOT. I don't want to lose too much power and the car is knock free in 2nd gear. Using Grimspeed for boost control.
Can you email me your logs and map?
Old Jun 1, 2015, 10:59 AM
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If increasing fuel doesn't help, I'd lower the timing in the load cells where you see the knock. If that still doesn't work I'd lower the boost.
Old Jul 28, 2015, 08:20 PM
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Originally Posted by ronaldo9
If increasing fuel doesn't help, I'd lower the timing in the load cells where you see the knock. If that still doesn't work I'd lower the boost.
So in your opinion less timing and more boost makes more power than less boost with more timing? At what AFR would you say it's too rich and we need to try something else? I've got it to 11.0 in the areas of knock and it appears to still be there. I was considering dropping the boost like 2 psi and trying for 11.4-5 again but I don't want to waste my time if there's a better way to go about it... sorry I havent been on here or messed with the car lately. Been on vacation / had things going on.
Old Jul 29, 2015, 05:12 AM
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AFR should be 11.5-11.8 in my opinion for 93. Without seeing your map we have no idea what your timing looks like but I would aim for around 3-4 at 4000-4500 and 11-13 at 6300-7500
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