[Arctic Addict]

I have a 03 f7 with speedwerx pipe and can and I could not get over 7680 in the 1000' with a 1" track and 155 studds.Any ideas?

 

[Bontz]

One word ... clutching. Assuming your APV's are in spec, it's all clutching after you add mods like a pipe.

 

[frofro666]

Did you just change belts? I lost like 300rpm screwing around with diff belts. Did it hit 7800 or higher before?

 

[Arctic Addict]

always hit around 7920 but I also keep blowing belts before I hit 34 to 50 miles on them with a 10 mile break in.

 

[Cazwell]

sounds like you need a clutch alignment , quite badly, and if you need to pull some more rpm's, either go to a slightly lighter weight and/or tighten up your secondary spring setting