I'm not getting boost from the secondary turbo. I start from a stop, run 14PSI (I have a PMS), at transition it drops to 8, then after tranision, 4 or 5 PSI, steady. I unplugged the PMS to see if that was the source, problem still exists. It accelrates like when the vacuum chamber hose pops off. Vacuum chamber hoses are connected. I haven't started pulling **** yet because I don't want to get in there and have no idea what I'm looking for.
Here's the twist: if I release the throttle (sometime after transition), and slam it back down, I instantly get 14 PSI out of the secondary. Thoughts? If you can, please try to list causes in addition to procedures. |
if you release the throttle and slam it back down again.... doesnt that start the sequential sequence all over again?
did you check any leaks? |
I don't have any idea what releasing and slamming the throttle does. I have not checked for leaks - not sure where to start... https://www.nopistons.com/forums/pub...IR#>/dunno.gif
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Originally Posted by Sinful7' date='Sep 21 2003, 07:12 PM
I don't have any idea what releasing and slamming the throttle does. I have not checked for leaks - not sure where to start... https://www.nopistons.com/forums/pub...IR#>/dunno.gif
i have a hole in my crossover pipe and i have the same symptoms as you... but on mine it boosts to 10, dropps to 5 then slowly boosts up to 10 again. i have a hole underneath my crossover pipe that i can fit a finger thgouh |
no hissing, no leaks, no holes, near as I can tell. I just replaced all the OEM couplers, and I double checked them, they're tight. After transition, I won't get more than 4 PSI - the wastegate is being held open, I'm thinking. There's no other way I'd be losing 10PSI and not hearing it. I wonder if i have a little problem with the vacuum signal leading to the wastegate actuator, or the solenoid that controls it. Time to start pulling the UIM maybe?
Edit: I've sliced it down to two causes - the plumbing to control the wastegate and the wastegate itself, or the signal triggering the solenoid that controls the wastegate. |
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