Won't go over 10-12PSI after ZZP stage 3

[armcclure]

Originally Posted by hnbracing

it may not be mechanical the boosbypass solenoid could be bad(it is powered closed and depowered open and that oring dose go bad) you dont want the max spring pressure on the bypass actuator because the boost pressure may not be enough to open the actuator if it gets commanded to open by the pcm for excessive iat2 that is why it has an adjustemnt screw to set the spring pressure and zzp does make tuning mistakes

That's still mechanical if its not in the tune
And the valve is opened by boost only when in boost. Other times its
Vac operated. It wold never open at idle or cruise if it was solely boost powered.
But yes, if the spring is too high and you don't have enough vac (bad hose, leak) it could remain closed. I have had no issues with mine though.

Originally Posted by brian

Hmm.. I suppose I could test the solenoid. How dangerous is it to leave to bypass mod in place during my daily commute?


-Brian

It's fine just don't go banging the limiter. Gas mileage may suffer a little.

[brian]

Awesome, thanks!

-Brian

[hnbracing]

if its the soleniod its electrical

[armcclure]

Oooh you. I hate you.

[Papa C 2000]

I actually experimented with the opposite end of the bypass adjustment issue today. Since I got this car, I've found the throttle at cruise and low throttle openings to be overly touchy or sensitive. Just breathing on the pedal was all it took to start making boost. The cruise control even had a difficult time not feeling like it was surging and overcompensating for small undulations in the road. I figured it was inherent in the supercharged 2.0L engine and the fairly large (for a 2.0L) throttlebody. After reading this thread, it got me thinking about the preload tension on the actuator and how this would effect the amount of vacuum required to keep it open. It seemed like a really quick experiment to try, so this AM I backed it away on the slots, and is it ever different! I feel its much smoother to drive at low TP and transition to boost is much less abrupt... and the cruise is far more seemless. I expect my MPG will improve as well.