I am having trouble holding target boost in my VIII. whenever I do a pull(doesn't matter which gear it is they all do the same thing) I will sometimes hold 26psi and other times I will only hold 24 or even 20. its been varying from pull to pull. I had my car on a dyno did 5 pulls and each time was completely different. I have done a boost leak test and I have found no leak. I have also had 2 separate tuners look at my tune should hold 26psi just fine. any help or guidance please. my mods are HKS 272 with superteck springs and retainers, JB FP Black, Buscher Exhaust, Grimspeed 3 port, walboro 255, fic 2150 injectors(ony because they were free), tial BOV, Tial MVS with 1 bar spring, and upgraded plumbing. I have also deleted my EGR. also if you would like to view the tune to see for yourself I will be more then happy to send it to you.

 

I don't mind taking a quick look. Post it up.

 

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