Removing Knock Problems
Also the car is stock so I do not think that I am getting valvetrain noise. Where would I go to see what the knock sensors sensitivty is set at, and What should it be? The thing Runs like 40 to 42 degrees timing at idle is this normal or to high
Ok here is what I am looking at:
Crusing: at 55mph running a consistant 37 degrees advance. Part Throttle and at 1428 starts to get 1(.7) degree of knock and it immediatly knocks the advance to 13 it starts to falls to .1 KR by 2573, and the advance goes to 25*.
Then She gives it more gas and at 4099rpms It gets 1* KR and knocks the Advance to 21 from 25. As she climbs Rpms by 4850 KR goes to .04 and knock climbs to 22.5. Still in it now gets 2.7* KR and knocks the Advance to 20. The Kr again lowers to 1.6 at 5867 and advance goes to 24. Car shifts and she lets out she is at 98MPH and then cruises at 95 to 93 and there is no KR and timing is at 34* at 2342RPMS.
Then it looks like she lets of the gas all the way and timing goes to 3* and there is no KR. Then she gets to 80 and gives it gas but not to accelerate and timing goes to 41* and no knock, at 2066 rpms as she holds steady at 79 to 82 the Advance lowers to 25* and no knock. and as she goes from 82 to 88MPH and 2266RPMs Advance goes to 28 to 30 then to 28. Then she lets her foot off the gas completely again and the Advance goes to 41*
If anyone wants me to send them the log to look at it send me your e-mail address and I will send it to you so you can look at it.
Crusing: at 55mph running a consistant 37 degrees advance. Part Throttle and at 1428 starts to get 1(.7) degree of knock and it immediatly knocks the advance to 13 it starts to falls to .1 KR by 2573, and the advance goes to 25*.
Then She gives it more gas and at 4099rpms It gets 1* KR and knocks the Advance to 21 from 25. As she climbs Rpms by 4850 KR goes to .04 and knock climbs to 22.5. Still in it now gets 2.7* KR and knocks the Advance to 20. The Kr again lowers to 1.6 at 5867 and advance goes to 24. Car shifts and she lets out she is at 98MPH and then cruises at 95 to 93 and there is no KR and timing is at 34* at 2342RPMS.
Then it looks like she lets of the gas all the way and timing goes to 3* and there is no KR. Then she gets to 80 and gives it gas but not to accelerate and timing goes to 41* and no knock, at 2066 rpms as she holds steady at 79 to 82 the Advance lowers to 25* and no knock. and as she goes from 82 to 88MPH and 2266RPMs Advance goes to 28 to 30 then to 28. Then she lets her foot off the gas completely again and the Advance goes to 41*
If anyone wants me to send them the log to look at it send me your e-mail address and I will send it to you so you can look at it.
All KR comes in between .60 and .76 I am not sure what the other side of the histogram is measureing I know the top is RPM.
Last edited by sevanseriesta; May 18, 2005 at 12:52 AM.
Launching!
Joined: May 2003
Posts: 290
Likes: 0
From: Canadian West Coast
Originally Posted by dvanorder
Not trying to hijack--I just registered and am struggling with something similar on my 98 A4 Vette. It only occurs WOT, confirmed on the dyno. No knock heard, nothing seems loose. I have HPTuners scans of each dyno run. AFR is rich (11.7 at 4400 RPM and up), 3rd gear set to never lock TCC. Never a blip of KR other than WOT, and only around the 4400 RPM and up range. Car has a Blackwing and Borla Stingers, I've done a nice VE and MAF tune. Power's decent, 311/315.
For example:
4400 RPM 5 deg KR at .64, 3 deg at .68, 2 deg at .72
Lower KR for the other RPM ranges , all in the .64 to .72 range
For example:
4400 RPM 5 deg KR at .64, 3 deg at .68, 2 deg at .72
Lower KR for the other RPM ranges , all in the .64 to .72 range
I'm guessing your issue is too much timing at 4400-4800 rpm. The stock tune has a valley at that point dropping the timing to 23 degrees or so before climbing to 28. If you have raised the timing at the peak torque, that may be too much for the car. Some cars get away with it, some don't.
at peak toruqe (aka peak cylinder pressure) you might wanna do a little 'safety bump'. richen up the mix a bit, and pull a little timing. if you look at stock z06 bin, you'll see they do that too. it's a good little trick
Launching!
Joined: May 2003
Posts: 290
Likes: 0
From: Canadian West Coast
Originally Posted by sevanseriesta
So where would I go to do that which tables in general. Also should I copy the high octane table to the low octane table even while trying to remove KR
