Hey guys - I've got out of control enrichment during acceleration that i can't seem to dial out. (See Evoscan chart attached)

It goes way too rich (11.1 - 10.9) at the end of spool up right at peak boost, then drops back to the range I want (12.1 - 11.9 for E85) through to peak revs.

I need some advice on the best strategy to prevent the pig rich fueling at peak boost because it causes it to knock on E85. If I lean out the map in the 3000 - 3500 range by 1 full AFR point, it is too lean when crossing this zone during slower acceleration (not WOT)

I've been reading Mr. Fred's notes on the disassembly of the fueling subroutines. Should I try to reduce values in the Async Accel vs. RPM Adder table to lean it out during spool up?

(See Evoscan chart attached)

 

Did you make any changes to your maf scaling? if so put them back to stock.

 

Just in case, have you checked for boost leaks?

 

Log your MAF HZ man. Right when you hit peak boost, annotate where the HZ are at and adjust your MAF scaling to compensate in that area and above. you may have to add resolution. If you cannot get usable results with the MAF Scaling, you might have to adjust the MAF Compensation (it's like MAF Scaling, but with a multiplier hence GREATER effects).

Don't touch anything in the HZ ranges that the car drives fine with. Verify your MAF Scaling and MAF Compensation tables are aligned after you are done in so you didn't skew anything that didn't need adjusting (they share the same HZ reference)

Good luck. I had similar issues when tuning my 2G for e85 with an EVO8 ECU but not nearly as easy as your problem seems to be.