help with KR

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Apr 17, 2005 | 03:22 PM

greentahoe

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From: Tampa, Fl

help with KR

Im seeing some KR... up to 4* but its always around 3,000 to 3200 rpms between 30% TPS and 60% TPS. I lowered my PE TPS to 60% since I have a supercharger. Im only seeing around 15* of timing and I have no KR anywhere else. Im running 18* @ WOT with the meth. Ive already taken timing from these cells and Im still seeing the KR. Ive also added fuel in the VE tables at these points.

Apr 17, 2005 | 03:38 PM

RedHardSupra

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From: Laurel, MD

try 100octane, see if the knock goes away. if it doesn't, then it's not timing. if it does, then just pull timing in this range

Apr 17, 2005 | 04:35 PM

greentahoe

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Quote:

Originally Posted by RedHardSupra

try 100octane, see if the knock goes away. if it doesn't, then it's not timing. if it does, then just pull timing in this range

Im not sure where to find it. The KR only happens as Im letting off the throttle at around 50mph and in cells .20 -.44 at 1.4 and 1.6. Im pretty sure it isnt octane as I have no KR @ WOT or most everywhere else. Just this weird stuff as I let off the throttle. Usually around 11-20 % TPS. Could it be going lean for a minute after I let off the throttle and that cause it? Looking at the 02's sometimes they are very lean around 100mv but at the 4* point at a different time they are both around 700mv.

Apr 17, 2005 | 04:54 PM

Camaro ChriSS

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From: Canadian West Coast

Can you log the MAF air flow rate so we can tell where the issue is on your High Octane chart?

Are you certain there is no engine vibration or banging?

Apr 18, 2005 | 09:18 AM

sevanseriesta

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I logged a car yesterday that did the exact same thing I have not looked at everything yet but it did it everytime the car shifited to 3rd at part throttle

Apr 18, 2005 | 10:42 AM

greentahoe

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Quote:

Originally Posted by sevanseriesta

I logged a car yesterday that did the exact same thing I have not looked at everything yet but it did it everytime the car shifited to 3rd at part throttle

Im thinking its false, but I did have some pretty big jumps in timing in those areas (1.4 and 1.6 columns, mostly around .20gms/sec and .50 gms/sec) I took out a little timing and added fuel via the VE table in those areas to richen up where I was seeing positive Ltrims. It seems to have helped but its still there sometimes so Im begginning to think its false. I may tryadding the degree or 2 I took out and seeing what happens.

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