False Knock During AutoX & Track Days?

[jprice130]

All, I've been experimenting with N/A tuning in RomRaider and ECUFlash and have been monitoring WOT logs on the street and on a local dyno. In all cases, the logs are showing minimal knock, IAM remains at 1, and the car feels great.

Excited about this, I took my new tune to a local AutoX and was reviewing the logs of my runs after I got home. The logs had knock all over the place and my IAM had dipped down to 0.9. Nothing horrible I guess, but still annoying.

Are all the abrupt, back and forth movements of a typical AutoX causing false knock and this is just something I'll have to live with? It just kind of sucks to spend so much time and energy getting a tune perfected, only to have timing pulled due to the false knock that may come from all the jerky movements on a AutoX course.

Would love to hear if this is something others see with their tunes while competing and if there's anything in particular you do to manage it.

[steve99]

Originally Posted by jprice130

All, I've been experimenting with N/A tuning in RomRaider and ECUFlash and have been monitoring WOT logs on the street and on a local dyno. In all cases, the logs are showing minimal knock, IAM remains at 1, and the car feels great.

Excited about this, I took my new tune to a local AutoX and was reviewing the logs of my runs after I got home. The logs had knock all over the place and my IAM had dipped down to 0.9. Nothing horrible I guess, but still annoying.

Are all the abrupt, back and forth movements of a typical AutoX causing false knock and this is just something I'll have to live with? It just kind of sucks to spend so much time and energy getting a tune perfected, only to have timing pulled due to the false knock that may come from all the jerky movements on a AutoX course.

Would love to hear if this is something others see with their tunes while competing and if there's anything in particular you do to manage it.

Sounds like throttle tip in knock , generally in 2000-3500rpm just as you throttle on. It appears it quite hard to eliminate completely. It could also be FLKC knock around 5000-7000.

Can you log it ??
Try 3rd gear accel from 2500-3500 back off and repeat usually shows it in logs. throttling on arround 3000 is generally a bad point.

Better fuel or pull a bit of timing ??

[jprice130]

Yeah, most of the knock events were in the 5000 - 7000 range. I didn't have much trouble between 2000-3500. Although, the course we competed on this weekend didn't have me down in the low RPMs much anyway.

Unfortunately, I already deleted my logs in disgust after I reviewed them; otherwise I'd share them. I'm tuned for 93 octane, so I'll probably keep the tune the same but run 100 octane gas at the next event to see if that helps.

[s2d4]

Originally Posted by steve99

Sounds like throttle tip in knock , generally in 2000-3500rpm just as you throttle on. It appears it quite hard to eliminate completely. It could also be FLKC knock around 5000-7000.

Good to see we are on top of this, I think a lot of people see tip in knock and think they are talking about the same type of occurrence which just isn't true.