Originally Posted by
natethebrown Man, that is really unfortunate. I am NOT in love with the JWT tune for my VE. Horrible MPG.
I have done many VE cars with a JWT ECUs and they get from 33-36 MPG.
If you have bad MPGs it has nothing to do with the JWT tune. It has to do with a mistake you have made.
Generally when a car starts to get bad MPG you should look to see if you have a bad 02 sensor or the most common problem is that guys put in high flow - volume fuel pumps and they forget that when doing so you must put on a FPR to control the fuel pump if not the fuel pressure generally will be between 58-65 PSI. This causes about a 20% increase in fuel flow, which mean poor gas mileage and low HP numbers,
What a lot of people end up doing when they can not find their mistake is blame it on the ECU So now you go and get a programabe ECU that can now tune around your mistake because the tune is exclusive to your car.