Hpfp upgraded car sluggish now

[Blazinski]

I recently installed a used apr hpfp in my 08 A4. I do have a stage 2 tune by apr, fmic, downpipe and other mods. Before I installed the hpfp my car pulled hard at 2500 rpm's if I went WOT. Now with the apr hpfp it feels like it pulls no where close to what it used to, seems to be running sluggish. It does have power but not like before. I do have an appointment to get stage 2+ installed on Monday but I wasn't sure if I did something wrong or what is going on. I have been researching this issue for the last few days and found no answers and just more confusion. Should I hold off on the tune and see if something is wrong or move forward. Like I said, power does not feel anywhere close to what it was before installing upgraded hpfp. Any help would be greatly appreciated!! Thanks.

[wkhanna]

something changed..... so yes, find out why....

do you have access to a ross-tech vagcom cable to upload fuel pressure data?

you said you have stageII but are getting stageII on monday?
do the guys dong the work have the ability to diagnose?

[Avega5799]

Any news yet? I’ve read about people doing the rs4 fuel controller instead of hpfp


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