In short, how can I check whether it's woeking right? In the past, I've been told it didn't seem to be working correctly. Anyway, it's never really been an issue but something I knew I'd one day look at. That day is today since I'm off work.

 

It's a greddy Profec B-Spec 2 I have.

 

How do I know if it's working right? Do I simply turn all the settings right down and see if it boosts less?

 

 

For info, I bought a new control unit for it on eBay - don't know if it works or not but need to know how to check it first.

Edited March 3, 201510 yr by bird

You could try turning the knob and reducing the set boost level to zero percent. You then need to press the knob in to store the new setting. See if that results in a lower boost level. No need to alter any of the other settings just to test it.

Thanks Ashley, I turned them all right down in the low setting. The lowest I could go on Gain was 5%, everything else I just put as 0 and I still got 16 psi fairly easily. Would the boost controller stop me doing that if it was working correctly?

It's the set boost setting that is the one you need to turn down. If you turn the knob without pressing anything first, that is the setting you will be altering. You need to press the knob in to store the new setting.

If you've turned this down and you're still getting 16psi, the unit is either faulty, or it's not plumbed in correctly. The solenoids are known to fail on them, but my unit failed and I had to have it repaired. The symptoms I had were excessive boost which is caused by the solenoid remaining closed.

I would check the plumbing first.

I've had a look around the plumbing and that all looks fine.

I had saved the lower figures in the low mode.

 

I'll have a go at putting this other unit in and see if it works or not.

Talk to Noz he knows them well

What are your waste gate actuators set too pressure wise?turning the controller off will still mean it boosts but only to the pre set actuator pressure.

What are your waste gate actuators set too pressure wise?turning the controller off will still mean it boosts but only to the pre set actuator pressure.

 

I'm not sure. Is there a way to check that? It has external trust wastegates

 

- - - Updated - - -

 

Just been and changed the boost controller and no difference. In fact I think it peaked at 18.6psi

Had a quick look at the plumbing too.

No - goes to the intercooler piping a before the throttle bodies - so pressure source.

Com - this come off and is 'T' pieced and goes down under the engine so I can only assume these are going to the wastegates.

 

I believe this piping looks right but correct me if I'm wrong.

Talk to Noz he knows them well

 

I'm guessing Noel will be on at some point. I want it sorting before I get it remapped

If you connect the two vacuum pipes together that are connected to the boost controller solenoid, you have effectively bypassed it. If you try this and you're still getting high boost readings, then I think what hellraiser said is most likely the case.

Great. I'll have a go at some point.

If they are set high though, could the boost controller make it have more boost but not less so to speak?

Great. I'll have a go at some point.

If they are set high though, could the boost controller make it have more boost but not less so to speak?

 

Yes, but if you try that, you obviously need to make sure you don't exceed a safe boost level for your particular setup.

Can you not just turn it off.and if u still have mad boost check your actuators.

Or temp plum in a manule 20 quid job of noel to see.them sell the manule one to me fpr a tenner as its secound hand.lol.

Pmsl.

What would happen if I simply unplugged the power from the solenoid. I'm guessing these are 'normally open' solenoids so wouldn't that be just as good as bypassing it?

If you unplug the wastegate solenoids, you'll get unlimited/ungoverened boost.

What would happen if I simply unplugged the power from the solenoid. I'm guessing these are 'normally open' solenoids so wouldn't that be just as good as bypassing it?

 

They are normally open, but mine failed in the closed position giving excess boost.

If you unplug the wastegate solenoids, you'll get unlimited/ungoverened boost.

 

You're right, but I think he's referring to the boost controller solenoid and not the wastegate solenoid.

Yeah just the boost controller solenoid.

 

So is it worth trying to you think?

Yeah just the boost controller solenoid.

 

So is it worth trying to you think?

 

I'd just bypass it, that way you can totally rule it out. If you've got a straight connector, it takes about 2 minutes to do.

I expect the Wastegate actuator will have it's preset boost value written on it. It may even be adjustable. It seems quite common that most turbos have a higher rated Wastegate than stock which is a measly 7psi.

I've ordered a straight connector today from euro car parts. Didn't have any in stock locally but was free delivery.

I expect the Wastegate actuator will have it's preset boost value written on it. It may even be adjustable. It seems quite common that most turbos have a higher rated Wastegate than stock which is a measly 7psi.

 

I know the ones Ive got have an adjustment screw if that helps.

This is the screw I mentioned, I'm not sure why there green snot on it though...