ProjectRESuperG

Hi guys,

Got a little problem. I just installed a Profec E01 electronic boost controller on my car, and it is way overboosting right now, despite setting it to a very low .55 bar, about 8psi, and it is easily going over .7 bar (10.29psi), and sometimes even .94 bar (13psi), bad, I know. This even happens when the thing is switched off!

Which leads me to believe that I hooked things up wrong.

Here's what I did: Hooked up the nipple from the solenoid labeled "COM" to the wastegate, and the nipple labeled "NO" to the compressor housing, and the pressure sensor tapped into the factory pressure sensor. Doubled checked all the connections last night, nothing lose, particularly from the wastegate nipple. All new silicon vac lines were used, and zip tied down at every connection, except the ones on the turbo, which are clamped with hose clamps.

While I was checking under the car, I noticed the waste gate actuator has a small hole on it, is that normal? This hole is on the body of the actuator itself, small, probably no more than 3mm in diameter.

I got this car used, and didn't have a boost gauge installed, figured I save up and use the Profec as a boost gauge, save $$$ this way, so I can't be sure if it was doing this before or not.

My car is setup as follows:

HKS Hiper cat back
HKS Super Mega Flow
test pipe (precat still there)
FD Fuel pump

Car runs great, other than the over boosting problem, any help you guys can give me will help, thanks!!!

Cosmo Donk

I have a feeling your mods are just pushing your boost up. If the unit is turned off it should not be messing with the boost. Try hooking up the wastegate line directly to a manifold nipple and then hook up the Profec to an extra manifold line so it can read the boost. Never mind if is complains to you that it is hooked up wrong, just use it for boost. Se how much boost you get with the gate hooked up to the manifold directly.

fc3seeker

Did you port your wastegate after all those mods?

YearsOfDecay

I would say that what you have got there is "Normal" for a TII with a modded exhaust system.

Boost controllers cannot lower the boost level.

A TII with a stock turbo and wastegate with no cats and a catback exhaust system will hit boost levels of 11-12+ PSI under full throttle in 2nd and 3rd gears....

Problem is that thw stock wastegate is WAY to small to handle the exhaust flow created by opening up the exhaust system.

Even if you set your profec to the lowest posible boost setting, the wastegate will open up there, but the boost is going to continue to rise because of the inadequate wastegate.

Port your wastegate, or have a larger wastegate door put on and port it to 35mm.

ProjectRESuperG

Thanks for the info guys.

No, my wastegate is not ported, been meaning to do it, just didn't get around to it. I figured leaving the precat in won't make it as bad, I guess I was wrong?? How much of a difference in boost pressure can the precat make? More or less than the main cat?

My main cat seems like it's in good shape by the way. I still have the factory TID btw, no leaks.

I will try hooking up the wastegate to the manifold, and see what I get.

Thanks again!

carx7

iTrader: (31)

Yep, I agree with everyone else. You're just seeing boost creep and the controller won't help that.

jon88se

even with the FD pump thats still a tad too much boost - port the wastegate and the boost controller should then work since right now it's just a set of lights

ProjectRESuperG

Ok, I guess it's porting the wastegate then.

One last question: with my current setup, is it possible to hit over 12psi? I hit 13.2 this morning.

My setup once again:

HKS cat back, Test pipe, HKS intake, FD fuel pump, keep in mind, I still have my downpipe with precat intact, it has NOT been removed. Everything else is stock, even the TID, oh I do have a HKS BOV, but I don't think it's relevant here.

I just want to make sure it is indeed the wastegate before I decide to tear it all apart.

Thanks again!

jon88se

yes...you need to port the wastegate. you could put a cat back in and the boost should drop but porting the gate is the best solution as the cars run better without cats. 13 psi is dangerous without any more fuel mods and your boost controller is doing nothing now...port the wastegate and you should be safe @ 9-10 psi.

ProjectRESuperG

Ok guys, update:

I decided to take out the test pipe and put the stock cat back in. I figured if this is causing the my usually high boost, then I might as well take it out to avoid a blown engine.

Well, took it out and put back my stock cat, guess what? Still boosted easily to .8bar (over 11psi)! Now, I'm almost certain it is my wastegate actuator, maybe it's somehow defective? As mentioned in my first post, I see a small hole, around 2-3mm big on the "body" of the wastegate actuator, and was wondering if it's normal or not. Anybody can enlighten me? Meanwhile, I am looking for a S4 wastegate actuator, or even better a S5 complete turbo, manifold combo.

jon88se

put the stock airbox back on as well and you won't overboost anymore

ProjectRESuperG

Ok, so what you're saying is, having a cat back, and intake, all else being stock, will make me boost to 11psi???

Anybody else with this same problem?

I thought you will need to remove the downpipe, or main cat, or custom make your TID to get that type of boost?

I'm still new at the FC, but I thought you will need more mods than an intake and cat back to boost past 11psi.

Dan H

Hey Mark, 11 PSI doesn't sound right with that mild setup.

I had a full RB 3' exhaust turboback on my old '87 TII, full intake, standalone and the most I saw was 12PSI which I thought was pretty unsafe already. Thats with the wastegate ported too.

I think you're right with the wastegate actuator. Did you try testing it out with a pressure gauge to see if its opening properly?