Quote:
Originally Posted by Malt
If my IAM was at .55 with the new 93 octane map there would be no hesitation on my end to do one of the following:
Figure out what's causing the knock (bad fuel?) or swap over to the 91 octane maps and still use 93 octane. The previous maps shiv has given us were all based on 91 octane to begin with and these new 91 maps are even more tweaked, so its not like you'll lose all that much. Then again, you could just let the trims learn a bit more and take more logs. Its highly likely that once the ECU learns all the trim conditions things will fix itself. You could also try to scale your MAF to see if that helps things along (if your trims are excessive).
I also have some slight knock at lowish RPM and high load in a higher gear, which is to be expected. The knock you are seeing is slightly concerning to me, but I'm not a pro tuner or an expert on these matters. I've contemplated swapping back to the 91 maps just for a margin of safety as the maybe 1-2 HP we're getting with these new maps isn't worth the knock that some of us are getting due to poor fuel.
Where I'm noticing my knock is during throttle transitions between no throttle and part throttle. The knock is very slight but it appears that STFT is pulling back excessively as soon as you get back on the throttle which is causing a lean condition, which results in the knock event. It rapidly corrects itself but I'm wondering if there is a way to correct the issue without resorting to dropping down to the 91 maps. @ Shiv@Openflash might be able to shed some light on this matter. |
It depends on where the knock is. The only differences between the 91 and 93 maps are 1.05 degrees of timing over 6k. That's stage 1, but I'd guess similar for maps with EL/UEL manifolds.