Diablosport Forums

I bought a U7158 for a 2001 Ford Lightning, installed the 91 Performance Tune, no pulley. My gas mileage immediately dropped, and the power increase is negligible at best, I'm just wondering if I was too hopeful at what this could do for my truck or did I just get a bad tune, and need a new one?

You should feel solid gains of 35+ HP in a stock lightning, more with a pulley, may want to get it on a dyno to verify fueling is correct.

What can I do to correct that?