VersaTune User Forum

Fixed an issue explained in previous thread by purchasing new maf sensor. Car feels strong and healthy, did some logs to verify but it appears i am running exremely lean at wot. Here is two attached logs. Currently running the 93us high load high flow downpipe base map. Mods- cobb catted downpipe, hpfp, everything else is stock. Maf sensor is super clean.

I'm quoting myself from the other thread you had opened. Mind that you didn't have a leak but a MAF sensor with a totally different response curve which was assumed to work as the stock one:

mituc wrote:If the problem was the MAF cal (and will be a big problem when you will fix the current issue) the fuel trims will be positive. In your case they are negative.

So now you fixed that problem and your new problem is the fact that your MAF is not calibrated for the intake you have and the fuel trims are high and have positive values (as predicted).
Right now your car runs "healthy" as long as while in closed loop the ECU can still correct the fueling. Once the deviation exceeds a certain limit the ECU will not correct that any more.
So you need a MAF calibration, but so far the ECU compensates for at least 10% of that deviation so you are not running awfully lean, but not healthy for sure.

It is on a stock intake

In this case you will have to check for any intake leak after the MAF and before the turbo.