I want to go over 100!!!!!

[The Funk]

Hey, guys I have started having issues with my 07 lbz. It started having issues about 1 month ago I recently replaced my maf sensor. It is not wanting to past 100mph sometimes it will and some times it won't. I have logged it and even with the throttle position at 100% the desired rail pressure falls off.
Thanks

 

[ripmf666]

Do a bottle test. Sounds like you need to shims your fuel pressure reliefs valve or replace it with a race valve.

 

[The Funk]

it has been shimmed all ready it was running 110 last year in the 1/4 with the same set up besides the intercooler

 

[madmatt]

something in the tune or a sensor is causing it we think. Once you get to moving pretty good the desired frp starts to fall and the actual follows right behind it. He's got plenty of lift pump and nothing has been changed since he ran last year well in excess of 100 mph in the 1/4. it was involved in a front impact collision this winter.