Hey guys. I recently installed a FPR in my car and bumped up the pressure only by 2 psi. I took my car to the track and ran almost half a second slower. Launches were consitent with runs before I installed the fpr. It seems to be killing my high end. Is this normal. Thanks. O, my setup is just i/h/e. I use to hit low 15's and now i'm hitting high 15's since the fpr was installed.

 

anyone?

 

 

that is wierd.... what kind of fpr is it?

 

b&M

 

anyone have any ideas?

 

and u think the fpr is what caused u to lose a "half" second on your time...so many other things could cause u to lose that half second....

 

I'm a very consistent driver and know my car enough, to know that something isn't right. Nothing has changed besides the fpr in my car...at the same time conditions at the track were identical. I just want to see if anyone has any explanation that they want to throw out. Thanks.

 

im not saying your not a good driver or not consistent or that u dont know your car but something like a half second can be caused by many different things.....even the best of the best will never run the exact same time each and every time down the strip...my 2 cents

 

Your problem is trying to tune your engine by pure guess.

Put it back to stock level, its a common misconception that with i/h/(C)/e you need more fuel pressure. The truth is an fpr isn't very good by itself or without a dyno.

Because AFC's are not very good at adding more fuel, the common way to tune the car is by adding more fuel with the FPR, and leaning out the areas that need it with the AFC.

Put it back to stock and don't play with it until you have some solid proof that you need more fuel.

 

Thanks for your input styleteg, well appreciated. I am aware that butt dynos and tuning "guesstimations" are not the best things to do; but I felt that 2 psi couldn't hurt or help that much, so I set it at 2 psi. Amazingly, the car is hellofalot smoother...and any butt dyno would be able to tell. I mean seriously a lot smoother than before. Smoothness can't be a bad thing but then I hit the track and ran a slower time... hmm...