upgrade to a waller stock turbo mod and porting, and im still overboosting! i checked for a vacuum leaks but can find any (used waterbottle and running engine). I check the boost solenoid and it holds at 5psi when disconnected. clean the iac. idle sits at about 900-1000rpm throttle stop screw all the way backed out and throttle bottoms out and not sticking. the car overboost to max on my guage (20psi). what else can i check? im thinking its programming/ecu but the nolan chip came from RPM with the crate. what could it be....? bad iac but it doesnt search for idle..?
Still overboosting?
- Thread starter ilandaze2
- Start date
It's just a six
Super Member
Re: Still overboosting?
Is the actuator arm adjusted correctly?
Does the wastegate open & close smoothly w/the actuator hooked up?
Where in SoCal are you?
Is the actuator arm adjusted correctly?
Does the wastegate open & close smoothly w/the actuator hooked up?
Where in SoCal are you?
Re: Still overboosting?
turbo was just rebuilt and installed so i doubt it would be a junky wastegate. the old stock turbo did it too but i changed it out because it had a lot of play and i strip one of the oil return line bolt holes. i adjusted the wastegate rod but it still overboost. it mainly does it on the freeway. maybe on the street but i usually run out of room but on the freeway once you floor it it goes to 15psi and passes it to the max (20psi)?
im out in san diego but the trucks back in norcal because of wen i stripped the turbo. found out i was also missing a front upper control arm nuts so my bushings are shot and wasnt able to drive it back down to socal. i will prolly get it next month. i thought wastegate was just inadequate on the stock turbo but this one doing too. thinking of going manual boost control valve but i will lose ecu features.
turbo was just rebuilt and installed so i doubt it would be a junky wastegate. the old stock turbo did it too but i changed it out because it had a lot of play and i strip one of the oil return line bolt holes. i adjusted the wastegate rod but it still overboost. it mainly does it on the freeway. maybe on the street but i usually run out of room but on the freeway once you floor it it goes to 15psi and passes it to the max (20psi)?
im out in san diego but the trucks back in norcal because of wen i stripped the turbo. found out i was also missing a front upper control arm nuts so my bushings are shot and wasnt able to drive it back down to socal. i will prolly get it next month. i thought wastegate was just inadequate on the stock turbo but this one doing too. thinking of going manual boost control valve but i will lose ecu features.
It's just a six
Super Member
Re: Still overboosting?
Do it have a cat converter? Straight through muffler? Big exhaust pipe? What RPM does the engine go to?
Sounds like the wastegate hole is too small.
Does the wastegate open & close smoothly w/the actuator hooked up?
Do it have a cat converter? Straight through muffler? Big exhaust pipe? What RPM does the engine go to?
Sounds like the wastegate hole is too small.
Does the wastegate open & close smoothly w/the actuator hooked up?
turbodig
Active member
Re: Still overboosting?
Run a hose directly from the compressor barb to the WG servo canister... what do you get for boost? (ie, bypass the solenoid)
If still too high, take turns out of the WG rod until it's where you want it to be. If it never does go low, you either have a stuck WG arm, or a bad servo canister.
Wastegates are finicky, and if you're going to have the chip run it, you'll need to have it dialed in to the system that you have. This would require a few data runs from the truck.
ilandaze2 said:
Run a hose directly from the compressor barb to the WG servo canister... what do you get for boost? (ie, bypass the solenoid)
If still too high, take turns out of the WG rod until it's where you want it to be. If it never does go low, you either have a stuck WG arm, or a bad servo canister.
Wastegates are finicky, and if you're going to have the chip run it, you'll need to have it dialed in to the system that you have. This would require a few data runs from the truck.
Re: Still overboosting?
its just a six,
i got the whole RPM stock build motor with vortec package. its listed below in my sig. to tell you the truth i never looked if i had a cat. i know i have a the side exhaust and the muffler does look like much at all. heres the pics of my Ty.
http://www.syty.net/forums/showthread.php?t=47202&page=2&pp=15&highlight=visit
turbodig,
in other word wire it straight to the wastegate and be very careful..? how would the datamaster help? does it display boost or are you just looking for timing and overboost codes? the datamaster next on my things to get and maybe a wideband so i dial in this ty and my turbo corrado. My corrado runs a manual boost valve and external wastegate and is much easier to dial in. The Ty one is starting to give me a headache.
its just a six,
i got the whole RPM stock build motor with vortec package. its listed below in my sig. to tell you the truth i never looked if i had a cat. i know i have a the side exhaust and the muffler does look like much at all. heres the pics of my Ty.
http://www.syty.net/forums/showthread.php?t=47202&page=2&pp=15&highlight=visit
turbodig,
in other word wire it straight to the wastegate and be very careful..? how would the datamaster help? does it display boost or are you just looking for timing and overboost codes? the datamaster next on my things to get and maybe a wideband so i dial in this ty and my turbo corrado. My corrado runs a manual boost valve and external wastegate and is much easier to dial in. The Ty one is starting to give me a headache.
Aeroking
e.i.
Re: Still overboosting?
when my truck is warmed up, my stock WG expands and seals shut.
after driving, reach down and see if you can move your WG rod front to back. (careful its HOT). lol
i went to a manual valve on mine, but still, a sticking WG will still overboost no matter if you have a controller or not. finally i put an external gate on the crossover.
when my truck is warmed up, my stock WG expands and seals shut.
after driving, reach down and see if you can move your WG rod front to back. (careful its HOT). lol
i went to a manual valve on mine, but still, a sticking WG will still overboost no matter if you have a controller or not. finally i put an external gate on the crossover.