[themyst]

I'm a little confused and I hope someone has an idea as to what's going on....

on 93 octane with FBO, my 6MT 135i autotuned to 15.6psi and 31IC in hot temps. My 6AT 335i is autotuning to 14.1psi, 0IC (aggression 1.7) in colder temps, exact same bolt-ons. The gas is from the same station. Both cars no meth. Only thing I can think of is when I picked up the car from the dealer they were possibly being douchebags and put 87 in the tank and it's slowly mixing away.

Can anyone provide insight as to why the autotuning logic is so different on the 6AT vs 6MT? The bolt-ons are installed properly and we tested for leaks on both the FMIC and DP side, perfect and tight.

I would imagine the 6AT should autotune much higher than the 15.6 psi my 6MT autotuned to.

[jjurroz]

run the car dry and put some fresh gas into it for a better comparison. Octane has a huge difference.

[topspin]

Originally Posted by jjurroz

run the car dry and put some fresh gas into it for a better comparison. Octane has a huge difference.

+1

I noticed that my boost dropped substantially after filling up one time. I watched boost go from 15 PSI to 11.8 PSI fairly fast. At the time I really didn't know what the problem was. However after filling up again my car autotuned to 14 + PSI with just a few pulls. I now believe that I put 87 octane in by mistake. Just a few gallons of 87 octane mixed with 93 octane will make a noticeable difference.