I recently started running E85 and everything was going alright with the tuning until I turned the boost up to about 26 psi. Now I'm having a hard time with the AFRs dropping after max boost which seems to indicate a boost leak.

I did a boost leak check and had leaky throttle seals and a few other small leaks that I fixed. I can't hear any leaks now at 25 psi when I do the test, but my logs are still screwed up.

Log 1:


Log 2: (tried to lean out the rich areas a little)


Log 3: (same as log 2 but from 3,000 rpm)



To me it looks like I still have a boost leak but I suppose it could be something else. And for the record, I know these AFR maps are screwed up and shouldn't look like that, but I've been adjusting them based on the logs.

Set up Notes:
Tephra V7
Edit maps with ecuflash 1.4 and upload with 1.31 (1.4 won't connect)
26 psi on E85
Basic mods (PTE 1000s, Walbro 255, MBC, TBE w/ test pipe, Apexi air filter, Samco MAF pipe, Ebay LICP)

 

do the leak test to 30psi~........ the easiest way to get solid a/f is block your map from up to down, cover more load then just the loads being traced so you can be sure the tune is safe in every gear/load/rpm, etc. for spoolup keep the a/f under 12.8 or it will actually hurt the spool. i got my setup to hit peak load @ 3700 personally. It doesn't matter how your fuel map looks as long as its giving you the a/f you want it to. the timing map should stay smooth tho, or it can cause issues or bad drivability etc. for everything after spool aim for 11.8-12.2 inbetween there. whatever hte car likes. dont go beyond 12.2 tho.

if you want me to clean your map up pm me if you dont understand what im telling you.

 

Update: I disconnected my MBC and did the boost leak test to 30 psi, and sure enough, I had a leak! Once I got over 25 psi, my outlet connection on the intercooler had a very bad leak. I replaced the crappy worm gear clamp with a t-bolt clamp that came with my new ETS intercooler (waiting to be installed) and that fixed the leak. I also had a small leak on my boost gage.

I'm going to smooth out the fuel map then take another log tonight. I'll post the results so (hopefully) we can see the before and after results of a boost leak.