Preturbo 335i Strange Results

[rudypoochris]

I am also seeing something else funky. My DME is pulling timing when the meth hits some of the time. Usually this is due to knock, but it doesn't knock/pull timing at these same RPMs with no meth.







Timing loss is only on meth onset and I am not progressive. I wonder if its flooding or something.

[Richard L]

Originally Posted by rudypoochris

I am also seeing something else funky. My DME is pulling timing when the meth hits some of the time. Usually this is due to knock, but it doesn't knock/pull timing at these same RPMs with no meth.

Are you sure it is knock? I would check the STFT and see you are having methanol inbalance distribution to the cylinders. You can do this by comparing the two banks.

Can you log individual cylinder timing? This is a real useful tool for your kind of project.

[rudypoochris]

Originally Posted by Richard L

Are you sure it is knock? I would check the STFT and see you are having methanol inbalance distribution to the cylinders. You can do this by comparing the two banks.

Can you log individual cylinder timing? This is a real useful tool for your kind of project.

I need to flash the DME to log individual cylinders. I could do this if I got a cobb... maybe I should do it. How could there be an imbalance if I am injecting pre-turbo into both turbos? Even if there was imbalance, I have more than enough E85 in the fuel itself to cover the boost targets I am testing at. It could be the DME reducing timing for some kind of torque reduction (according to the tuner), but I don't think that it. Weird.

The STFT are on the graphs as "Trims". They are almost maxed out since I run a lot of E85 with no flash.