Boost issues. Possibly Greddy Profec problem

[TYTILIDIE]

I turned the EBC off yesturday and the turbo wouldnt spool past 5psi. Well, I turned it on and it stayed that way for about a couple miles. Then all of a sudden I had to the floor and it was stuck at 5 psi then I heard a little swoosh and it shot up to 18 where I normally run it and it was fine after that. This happend to me once over hte summer right after I did my A2A but never said anythign cause it only happend once nad never again. Today we went to the Humane Society and when we got back in thre truck it did it again. I had to keep punching it and it would spool a little higher everytime till finally was back at normal. Another odd issue that iM not sure if its related or not is that I can not run over 18 psi no matter how high I turn it up. Any thoughts here?

 

[Sy229]

Re: Boost issues. Possibly Greddy Profec problem

I guess I would start by checking the condition of the vacuum lines on the Profec. Maybe they ended up in a bad way after your A2A install.

 

[spooldup]

Re: Boost issues. Possibly Greddy Profec problem

I would connect the vac lines from the stepper motor together and see if the gate opens at the fixed or specifed level you set it for first. If that works fine then it's your boost controller. I would imagine since you turned the controller off and your boost was still wacky that your gate is stuck or something like that. When you turn the profec off your turbo should run back down to base boost automatically.

 

[It's just a six]

Re: Boost issues. Possibly Greddy Profec problem

Just wondering how much knock retard you are getting?

 

[Daryl H]

Re: Boost issues. Possibly Greddy Profec problem

I had a Greddy Profec B shell out my engine.
I suggest you be careful.
I believe they said the stepping motor was bad. It went into the trash after that.

 

[TYTILIDIE]

Re: Boost issues. Possibly Greddy Profec problem

Knock is minimal to none. I pulled the VAC lines off to see if it would overboost, sounds dumb I know, and it didnt. It still would not go over 16 PSI now. Could my turbo be going south?

 

[It's just a six]

Re: Boost issues. Possibly Greddy Profec problem

Safety wire the wastegate to see if it will over boost.
I have a feeling the wastegate is creeping open????

 

[SY2932]

Re: Boost issues. Possibly Greddy Profec problem

If you are still running a cat, it may be broken up inside. About a week before I installed my PTE turbo, I couldn't get more than 12 psi. Once the stock downpipe was removed during the install, I noticed that it was COMPLETELY broken up inside. Surprised that I could get any boost at all...

 

[TYTILIDIE]

Re: Boost issues. Possibly Greddy Profec problem

No CAT here. I just took the atuator off and am going to go to a turbo shop here and have it tested. We'll see what happens. If I need a new one for a 20g, where can I get one?

 

[It's just a six]

Re: Boost issues. Possibly Greddy Profec problem

No CAT here. I just took the atuator off and am going to go to a turbo shop here and have it tested. We'll see what happens. If I need a new one for a 20g, where can I get one?

Let us know your results on testing your actuator.
I would not install a stock 20 wastegate actuator.
Do you have an air compressor & an air regulator? If you do ,you can test it yourself.

Find something (an Actuator) that requires at least 5 PSI higher that your stock one.
Like between 10 to 15 psi. (IIRC,,, it's been a while since I tested mine)
Meaning,your actuator will start to open/move @ those pressures.

 

[TYTILIDIE]

Re: Boost issues. Possibly Greddy Profec problem

Well, had the actuator tested and its golden. I ended up pulling the trubo to inspect the WG. It seems fine, opens and closes all the way and I didnt see any cracks. I put everything back together and now boost is smooth to 15 psi and thats all I get. I have the Greddy set at 65% and when I crank it to 100 it still only goes to 15 psi but is slow and choppy. So Im guessing its the Profec. Im going to maybe throw the old solenoid back on and see if I can get it tuned the way I want it til I can afford a new Profec. Still though, even after everything, I pulled the VAC lines off and wire the gate shut and 15 psi. Pissing me off. I did a leak test at the turbo too so Im out of ideas except for the EBC.

 

[It's just a six]

Re: Boost issues. Possibly Greddy Profec problem

Maybe you have a leak somewhere in your plumbing & it leaks @ 15 psi?
In other words,it can boost to 5,10 psi fine,but when you get around 15 psi a hose leaks.
I would pressurize your intake plumbing & check for leaks.

You installed an air to air setup? You have more couplers to leak correct?

With the wastegate wired shut,it should overboost like crazy.

 

[TYTILIDIE]

Re: Boost issues. Possibly Greddy Profec problem

Yeah like I said, I did a leak test. But here is what I did find. Went through the whole turbo and it was good, actuator was good except that the bracket I made to relocate the actuator when I re-clocked the turbo has been kind of pulling on the actuator all this time and it looks like MAYBE it was binding up. So I re-drilled some holes to cure that. I tested and still could nt get over 15 psi. I shortened the WGrod all the way. Boost is back where it was and it comes on VERY strong. I had to adjust the EBC a little but have running 20 Psi now and damn it feels good. So Im thinking problem solved for now but only time will tell.

 

[It's just a six]

Re: Boost issues. Possibly Greddy Profec problem

If the actuator was off,that still does not make sense when you said you wired the wastegate shut & still only saw 15 psi?
You must not have wired it shut good??????

 

[TYTILIDIE]

Re: Boost issues. Possibly Greddy Profec problem

If the actuator was off,that still does not make sense when you said you wired the wastegate shut & still only saw 15 psi?
You must not have wired it shut good??????

I have no explanation. I thought about it almost all day today and it was wired pretty good, no play in the wire when I left or when I had gotten back from my test drive. Im not going to complain though you know? I was pretty damn impressed that I had the turbo off in 40 minutes and that was with the DP bolts getting stuck. Had it back on in an hour even after re-tapping/chasing the exhaust housing bolt holes.

 

[bezerk]

Re: Boost issues. Possibly Greddy Profec problem

well instead of making a new topic. i have an issue.

WOT my boost fluctuates on 3psi, wich is alot of powerloss.
i disconnected the solenoid, and now it works great. 20psi without fluctuation.
would the solenoid be bad?

Regards
Rene