Turbotech Over Boosting

[CLuTZ]

Hey fellas,

This is probably the 5th or 6th turbotech controller I have installed on a 4G, but it's been giving me grief!

I have tried 3 different combos, all with the same results~> 20+ psi.

First I teed it off the FPR vac line. Then I tried the hot side cooler piping nipple. Now I have it teed onto the b.o.v vac line. No matter if it's wound right in or right out- i'm still getting wayy too much boost.

This is how it's on now:

I pulled the valve and inspected it- which appears to be working fine. Ball in the bottom, spring on top, then the adjustment screw, washer and locking nut.


The unit is second hand- it came off an S15, but was apparently working fine when removed.



Any ideas??




dre

 

[iluszn]

Does it spike and come back down, or it just goes straight up 20+psi and hold? I know silly question as you wouldnt keep going if it was holding..

Have you pulled the BC apart to make sure its not blocked?
Or use a compressor to make sure that the pressure passes through it?
Does it overboost without the BC in place?
Are you using new hoses? If Yes, have you just fitted the hoses and not the BC to make sure hoses not causing issues. Sounds stupid but you never know.
BC is not fitted back to front (I doubt its this, but better ask just incase)

 

[milkandoj]

Mine had a bit of surface rust in it from the spring, so i sprayed some Inox inside. Unscrew it and check the ball and spring isn’t rusted.

This sounds stupid, but it the right way around? If you blow air into one side, the side where air freely escapes the hole is on the actuator? And the side that’s controlled by the tension in the spring is on your boost source?

If you just run a line from you pressure source to the actuator it doesn overboost right?

 

[milkandoj]

To check its letting the air through at low pressures, Unscrew it almost all the way out, so its set real soft with no tension on the spring, you should be able to blow through the inlet side, then tighten it and you wont. (coz you can only blow 1-3psi with your mouth, hookers may get up to 5psi)
If this works its working fine.
The other end will always let the air out, as it doesnt pass through, it escapes out the hole in the side.

 

[CLuTZ]

It's hooked up exactly like in the pic I posted above.

Does it spike and come back down, or it just goes straight up 20+psi and hold? I know silly question as you wouldnt keep going if it was holding..

Have you pulled the BC apart to make sure its not blocked?

Are you using new hoses? If Yes, have you just fitted the hoses and not the BC to make sure hoses not causing issues.

It's just going straight up to 20psi. You're not wrong when you say im not holding it there!

There are new hoses going to the t-fitting to the B.O.V and the t-fitting to the controller. They are a decent size- using a 6mm t-fitting.

Here's a pic of the controller disassembled, followed by the controller put back together and wound back in.

To check its letting the air through at low pressures, Unscrew it almost all the way out, so its set real soft with no tension on the spring, you should be able to blow through the inlet side, then tighten it and you wont. (coz you can only blow 1-3psi with your mouth, hookers may get up to 5psi)
If this works its working fine.
The other end will always let the air out, as it doesnt pass through, it escapes out the hole in the side.

Yeah i've tried this and it works. Both bleed hole and actuator hose port let air through, when the adjustment screw is out.

I haven't tried hooking the wastegate up yet directly to a pressure source- I have run out of hose! :lol:

 

[brisvr4]

Do you want my old Turbo tech Dre?
If you want it i'll post it down as I don't need it anymore mate.
Shoot me a pm.

 

[milkandoj]

Sounds like the controller is working.

I recon run a line from your pressure source to your actuator to take the controller out of the equation. See if it runs gate pressure or not. I use small fuel hose now not vacuum hose, as its reinforced and rated for pressure, so less chance of splitting.

If not then i recon start looking at the operation of the actuator.
if you blow air into the line to the actuator with a compressor, does it open and close freely?

 

[youda]

that boost line is way too small too be responsive enough. try the line that runs in between your manifold and tappet cover for a run and see if it works that way. mine did a similar thing and this solved it. make sure u use as large a hose as you can up to the turbo tech. otherwise i would say your spring inside the turbo tech is too strong.

 

[CLuTZ]

Sounds like the controller is working.

I recon run a line from your pressure source to your actuator to take the controller out of the equation. See if it runs gate pressure or not. I use small fuel hose now not vacuum hose, as its reinforced and rated for pressure, so less chance of splitting.

If not then i recon start looking at the operation of the actuator.
if you blow air into the line to the actuator with a compressor, does it open and close freely?

That's what i'm going to do next- the car was boosting dead on 10psi just this morning tho. Nothing has changed except this (farken) controller. It's always the easy things that turn out to be the biggest pain in the ass!

that boost line is way too small too be responsive enough. try the line that runs in between your manifold and tappet cover for a run and see if it works that way. mine did a similar thing and this solved it. make sure u use as large a hose as you can up to the turbo tech. otherwise i would say your spring inside the turbo tech is too strong.

The lines I installed are a fair bit bigger than the factory ones. They came with the controller, and were used on the S15. The hose going from the controller to the wastegate is still the factory hose, and is pretty small and was real hard to get on.




Tim, i'll shoot you a pm in a sec mate- thanks for the offer

 

[brettu26]

I can shoot you my old one if required too mate

 

[3zercrowd]

Hmm...I would throw some lube spray around the actuator where it hooks up to the flapper arm (and check its operation as well)....there may be a chance that its not opening at all (or intermittant like your 10psi then HEAPS ) ive seen it stick than not stick before h34r: ......try that :thumbsup:
ALSO to totally rule out that actuator, throw another on