Quote:
Originally Posted by Kodename47
I would suggest that if you're tuning the car then you want to remove as much consistent IAM drops, FLKC and FBKC as possible. However as the ECU and programming isn't perfect there will always be times when knock might not be picked up or a false detection. For NA I would suggest that you could just let the ECU do it's thing, not so much with FI. The Romraider guys seem to have a wider tolerance than that of here, but they do run lower compression too.
You can stop IAM reducing in certain areas just by tinkering with the Advance Timing table (B in RR IIRC). FLKC or FBKC will still be active so you can let that do it's thing instead. IAM reduction is just another method of timing reduction and not necessarily a sign that things are generally poor, for example you could cause IAM to drop repeatedly at low RPM high load but if you stay WOT and it runs clean by the end of the pull you could be back up to IAM of 1. The reason it stays at a set value tends to be because you're not hitting the load and RPM requirements for it to re-evaluate. It's where the IAM is always moving and never hitting 1 is where you would start to look at the cause IMO. Besides, what does a IAM of 0.9 mean the timing is reduced by? At maximum on the average tune it's less than 1 degree, of which FLKC and FBKC will pull more.
If the tune consistently pulls timing at WOT, I would look into it. So long as it's not doing it all the time in other regions, or at such high values then I would simply not be too bothered.
I'm sure you've answered this before but have you reduced the default FLKC/FBKC values? On a well sorted tune then this could mean that any detected events cost you less and you can evaluate how much of a problem it is better IMO.
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The FLKC retard value is -0.65, would you reduce it even further? The tune is otherwise only has low levels of FLKC and doesn't drop IAM in other cases. It's a buddies car, and he likes to drive in 6th during his commutes.
I made some changes to CL fueling, so that it matches POL 100% (no, could keep from tinkering with it
). So CL target AFR at load 0.85 and above is around 12.8 down to 12.5. He tried this out and couldn't get it to FLKC more that -0.65 today. But I wonder what impact this will have on fuel economy, though I think it's not really in those loads in the majority of cruising and it should in most similar cases/accelerations transition to OL fairly quickly anyway.
Also, I wonder if it's actually the extra fuel that fixes it or if it's more seamless CL/OL transition.