Car is a D16Z6 civic with the greddy kit and drag intercooler. It gets up to the desired boost level of 8psi but it starts to tapper off around 5K-7K and the levels start to drop off until about 5psi. Boost controller is a turbo XS MBC. Is the turbo just to small or is a tuning problem. Iam also running the AFC hack with a -35 trim all the way throughout the band. Any advice?

 

Check all your vacuum lines. A small vacuum leak will own you. Also double check all your hoses. Make sure they are clamped on good. The turbo should be more than fine for your setup.

Good luck.

Keep us updated.

 

I guess I will go ahead and replace all the vaccum lines. I havent changed them since I bought the kit last year.