I can leave the line at just about any boost level. I footbrake my car and it has 4 wheel drums w/o a line lock. It has left the line as high as 23psi and works well at around 10psi. Traction is a bit of an issue with 26x8.5x14 slicks. But still puts down 1.50's 60'. Like any car, you need to get used to it. When I have good air and not chasing down a record time it is pretty consistent. Both of our turbo cars will run within a few hundredths.
Alot of people run to big of a turbo or a chassis that can't handle the power. U-tube is full of them 10 second lag times. Kinda silly but when the power comes on...ufdaa!!! Trick is finding the right turbo combo and fine tuning it. We have all the hot rod engine combos - BB - SB - V10 - Viper - 4cyl turbo - V8 Turbo...but the most fun is hauling off on a BB Chevy with a Slant 6. I found my way to skin this cat. Later