Quote:
Originally Posted by PantsDants
My car completely falls on its face if I give it >50% throttle below 2000 rpm; it just bogs out and won't accelerate at all. This is on the 91 octane ESC tune with a modified snorkel. I'll try to find the log I captured it on but from what I remember when it happened, my AFR pegged rich and load shot up to something ridiculous like >4.0 g/rev.
Is there anyone with this problem who doesn't have a modified snorkel? It seems like that, besides an OFT tune, is a common thread for people experiencing this.
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I have seen some combinations of ethanol formulations and cars run quite rich at low RPM full load. I suspect it may be caused by some combination of header design, MAF turbulance and lower Ethanol %. All that you need to do to fix it is adjust the primary fuel table. The OTS AFR values will be in the mid-12:1 range down like this:
I fixed the issue by just tweaking it as such:
You can confirm by just datalogging a few low rpm/high gear pulls. The nice thing is that the engine will happily accept a pretty wide range of AFR at that low engine speed. Anything result from an actual 12.5:1 to 13.5:1 will work fine.