I have lots of power from 4-6k rpm, then none after about 6, I used to have a lot all they way through 7400, I dont know whats up, All filters are new and everything, should i get a new fuel rail or injectors or is the stock intake manifold not good enough? its a slightly higher compression a6 bottom end with y8, and I have the cam gear 4 degrees retarded. all it has is headers and an intake, 2.5 inch piping. is this a tuning problem or a parts problem?

 

Tuning problem.
when you retard the cam timing you build power earlyer in the rpm range, severly retarded cam timing such as your set up with 4*, witch is eaqual to being off tdc by a half of a tooth, will lower the power band. if you advance the cam timing you will raise the powerband so you would be making more power from say, 4-7500k rmps.
i am assuming it just started doing this after you installed the adj cam gear? if not maybe it just took the e.c.u. a while to adjust.

Retard of the cam = more low end tq and power.
Advance of the cam = more power at high rpms.
retarded cam timing is better for pulling through corners

 

thanks for the reply, It makes sense about the advancement for top end, but since the y8 head is different my friend said I had to adjust the timing to better suite the a6 bottom end, the cam gear has been the same the whole time and didnt slip, I tried advancing it to 0 and then further to 2 and 4 advanced but it barely runs and is super super slow as you time it more and more advanced, but maybe my spark is wrong then? because I didnt play with the distributor when I changed cam timing. thanks

 

what cam gear are you running? is it for an a6 or a y8? and what brand, if you have very cheap ones they will sometimes slip timing.
just make sure the distributor is evenly in the middle, it is more precise to time with the adj cam gear.
wait is your head or block milled?

 

You got that exactly backwards...

 

i have a skunk 2 cam gear for a y8 head, and its milled a little but not much