Originally posted by turbodude:
1. its more than likely your boost controller. Manual BC tend to do that.

2. Also alot of the XS bov i have come across leak liek no ones business, its those damn washers they use for adjustment. sole reason i now only use HKS SSQV and Blitz Bov.

3. Whats are your a/f levels?

4. How much timing are you running?

5. Have you tried bumping up the octane, therefore you can run some more timing as well as run a leaner curve?


1. That is a possibility for the boost to fall off but not a likely one for the power level to completely plateau.

2. Leaking boost is always a possibility but again a leak that large would be found fairly easily. Minor (i.e. hard to find pin hole) leaks would slightly slow boost generation and hamper holding peak boost but nothing considerable.

3. A/F Is "roughly" around 12 to 1. If could use some work up top as it drops to almost ~11 to 1 above 5500rpm.

4. Timing is maxed for pump gas.

5. That completely DEFEATS the point of using "pump gas"
I am sure a lot more could be rung out with race fuel of 100, 110, 120 octane...

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.