WhiteHawk

I am in the process of tuning my TBI engine with an Innovate WBO2 I just aquired. It is amazing how far off the tuning was (excessively rich). 454 TBI speed density 8746



Here is a log from a WOT run. You can see the MAP changing when the car shifts, looks like first gear had some tire spin. I am having issues logging RPM, so that sucks. Anyways does anybody know where these lean spikes are coming from? Also I have a super rich condition at the beginning of the WOT, but that maybe to much AE.

Thanks in advance!

RBob

iTrader: (1)

I didn't look at the image, bmp's are too large.

However, the lean spikes on the shifts are typically due to the rapid change in airflow. At high RPM the airflow strips the fuel from the runner walls. As the RPM drops fuel is deposited back onto the runners, causing a quick lean spike.

I've been able to reduce (sometimes eliminate) the lean spike by increasing the VE at the shift point. Along with some additional VE at the point where the RPM falls after the shift.

RBob.