You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
Hi, My EVO 9 is doing a lot of knock...I did 3 data logging, and all of them shows more than 15 Knock sum @ WOT...25psi tappering to 22psi...I'm with Stock Turbine & Injectors...
I was reading some threads, most of them guides to reduce the timming...but reducing timming only? do i need to adjust for fuel as well?
Your fuel map doesn't look too aggressive since it goes pretty rich towards high engine load. I think you can just try lowering timing advance in the areas where you are encountering knock and see if there is a reduction. (try to keep a nice flow to your maps)
Normally if you encounter knock people might recommend increasing fuel mixture (a lower AFR) and reducing timing (1-2 degrees might actually be enough) for the affected areas. (but since your AFR maps seems ok I don't think that's necessary)
You need to post up a log, so we can better pinpoint the issue! Do u have a WB? We need to know your AFR, before we can give any advice... You can knock from being overly rich, as well as running lean....
Just looked at your Fuel and Mivec maps...
MIVEC MAP: 28.8* is the MAX, so having 30's is useless!
FUEL MAP: I dont like your fuel map! it goes from 11.6 @ 180 load (I think it was) and the next cell over is low 9's... So the transition from that load cell to the next will be quite drastic, which could cause knock... Also looks like theres some "block tuning" going on...
FUEL MAP: I dont like your fuel map! it goes from 11.6 @ 180 load (I think it was) and the next cell over is low 9's... So the transition from that load cell to the next will be quite drastic, which could cause knock... Also looks like theres some "block tuning" going on...
I noticed that too, it should have a nice flow and not jump too much.
If you can post one of your logs with AFR, timing advance and knock sum we can move to the next step.
Last edited by NeoGearX; Aug 31, 2009 at 04:05 PM.
Reason: typo
