do i need a bigger wastegate or different boost controller?
03-27-2012, 11:20 AM
#1
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do i need a bigger wastegate or different boost controller? Ive got an older silver faced turbosmart eboost controller and the speed shop i have been taking it too that is very reputable (RMCR) has the boost controller set to no more then 12 psi. Soo I drive it for a week and it never gets over 12 psi, then today i hit a 4th gear highway pull and see 16 psi!!! Not good for my forged lt1 but i cant for the life of me find an owners manual for one of these! whats causing this to happen? I cant get over 10 psi in second with my current sucky gears so im stumped..I just dont want to start tinkering with the up and down button before talking to people on here. We all know how easy it is to pop a motor now days
Last edited by My2kz28; 03-28-2012 at 08:02 AM.
03-28-2012, 10:00 AM
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I took it back to them and they adjusted it, lowered the over boost, and it stayed at 12 for a while but now shes creepin up to 14-16 again but only in 4th and 5th..said it could be the wastegate but wanted to troubleshoot what else it could be before getting into changing the wastegate tubing. They are busy as hell over there so thought id get some more opinions on here..was also hoping someone would provide what you just did mightymouse!
03-28-2012, 01:24 PM
#7
is the gate vented to atmosphere? if not can you?
also what is the exhaust system after the turbo? can you close it up (e-cutout) and try again?
if either of those things affect your boost, then your gate is either not operating well (sticking) or undersized.
turbosmart has a couple different plumbing options for the solenoid, i believe one is specific to helping with creep.
i have a 42mm gate and with the exhaust capped up it can hold 11psi boost with the gate external but with the exhaust dumped/opened minimum boost goes to 13. thats with a 10lb spring.
also what is the exhaust system after the turbo? can you close it up (e-cutout) and try again?
if either of those things affect your boost, then your gate is either not operating well (sticking) or undersized.
turbosmart has a couple different plumbing options for the solenoid, i believe one is specific to helping with creep.
i have a 42mm gate and with the exhaust capped up it can hold 11psi boost with the gate external but with the exhaust dumped/opened minimum boost goes to 13. thats with a 10lb spring.
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03-28-2012, 02:13 PM
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is the gate vented to atmosphere? if not can you?
also what is the exhaust system after the turbo? can you close it up (e-cutout) and try again?
if either of those things affect your boost, then your gate is either not operating well (sticking) or undersized.
turbosmart has a couple different plumbing options for the solenoid, i believe one is specific to helping with creep.
i have a 42mm gate and with the exhaust capped up it can hold 11psi boost with the gate external but with the exhaust dumped/opened minimum boost goes to 13. thats with a 10lb spring.
also what is the exhaust system after the turbo? can you close it up (e-cutout) and try again?
if either of those things affect your boost, then your gate is either not operating well (sticking) or undersized.
turbosmart has a couple different plumbing options for the solenoid, i believe one is specific to helping with creep.
i have a 42mm gate and with the exhaust capped up it can hold 11psi boost with the gate external but with the exhaust dumped/opened minimum boost goes to 13. thats with a 10lb spring.
03-28-2012, 04:02 PM
#10
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Apply a little logic.
It was running fine ( albeit only for a week ). Now it isnt. So clearly the w/g hasnt suddenly got too small if it was fine for a week.
Check all hoses to ensure none are loose or leaking.. Check the boost control solenoid is working and not clogged with oil or something
Also, turn the boost controlled off and try it. You should get w/g pressure only whatever spring is in there.
It was running fine ( albeit only for a week ). Now it isnt. So clearly the w/g hasnt suddenly got too small if it was fine for a week.
Check all hoses to ensure none are loose or leaking.. Check the boost control solenoid is working and not clogged with oil or something
Also, turn the boost controlled off and try it. You should get w/g pressure only whatever spring is in there.
05-01-2012, 07:34 PM
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If boost continues to climb in upper RPM's in 4th and 5th gear, the gate is not flowing enough to control the turbo speed = boost.
05-01-2012, 08:01 PM
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I think that was sound advice though from Stevie. All other things being equal; if the setup was working fine before and now it's not. Perhaps you can just throw a small spring in there and run it right off the gate. If it over runs the spring and goes back to 16psi that's your answer.
05-01-2012, 08:03 PM
#16
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Scan the car and check the IAT's in the higher gears. If IAT is climbing very high and the PCM is pulling a bunch of timing, you will get boost creep with very low ignition timing.
