Let us know if the crank relearn solves your issue devilish64.
this is really starting to piss me off. I love the styling and heritage of this car but holy shit what a mechanical nightmare!!! And this aint my first rodeo.
Hey did you ever find out the exact cause to this issue? I've read the whole thread and I'm having the same exact issue at the moment.I'm not sure to be honest! I will check that at some point.
So today when I tried to do the crank relearn I filled the tank with 5gallons of CA premium pump gas (91) so I could try and use the stock tune. After unsuccessfully trying to do the crank relearn I decided to load my VMP pump gas tune.... my car is pullied for ~21 psi of boost so I knew the 91 wasn't nearly adequate so I filled the rest of the tank up with with 100 octane race gas and sure as shut the car felt like it gained a ton of power. I don't think I ever loaded this tune as I have been running e85 for close to a year now. I wouldn't say that the pump gas tune is as strong as my e85 tune use to be but it is surely better than my e85 tune feels now.... the car seems to have Better drivability and doesn't have the same lag when quickly letting out the clutch or quickly a stabbing the throttle. It spins my 315 nittos in second easily now. I don't know how my tune wich had been previously running excellent could feel so bad so suddenly but for some reason after I installed my RXT the car never ran right on my e85 tune. I don't know why that would happen.... it probably doesn't make any sense that it could but it certainly feels better and I'm glad.... I'm tired of being the one with the slow, fast gt500 in my group