The "A" setting on my AVCR is set to 14psi and when I got WOT in second for example up until 8500, i look at my peak hold and its 1.28 bar which is 18psi.

I have a HKS standard wastegate vented to atmosphere with a small pipe, so there really is no restriction in exhaust flow, but shouldnt the AVCR keep it at 14psi?

comments?/ideas?/opinions?

 

What is your gain setting? If it is too high it will spike. Does it only do this in 2nd gear?

-Andy

 

Not sure... ill try to check soon.



And in all gears.

 

Then it is probably the gain. You set a % for that and the target boost. Leave the target boost where you want it, and reduce the gain% until it stops overshooting.

-Andy

 

WG too small.


-Ted

 

Right it could be that your WG is too small as well, the easy test is to turn the boost controller off and see what boost you get. What is the spring in the WG?

-Andy

 

Its the 40mm HKS Standard with a 12psi spring.

Ill try WOT with it off and see what happens.... i use to drive around with it off so it stays at 12psi but i remeber it boosted higher then that.

 

The avcr is a very wild tool. It's a great controller if you have the time and patience to set it up correctly...

 

Indeed. Im going to have Kan setup mine soon.

 

If you take the pressure source for the boost solenoid directly on the turbo outlet, it will spike more and will require a low gain value.

I had this problem with my Blitz DSBC R model. When I moved the source to the Greddy elbow, the problem went away and boost was manageable.

 

My vaccum source is right on the compressor outlet.... nice call Chuck.

 

So I'm taking you moved it further down stream? I'm in the midst of installing an avcr on an sti with a fp green turbo. I'm just trying to add some others experiences to my memory

 

Where is the optimum location?

 

I would think on the intake manifold. That's what my avcr manual states...

 

AVCR is notorious for being difficult to use

 

But its one hell of a boost controller.



Im thinking of putting it on the underside of the GReddy elbow. Is close to the throttle body OK?

 

Interesting, I have my solenoid source only a few inches after the compressor outlet, and the AVC-R boost sensor off of the UIM. I don't have any spike issues. At one point I moved the solenoid source over to the UIM as well, but had spike issues. However, I didn't play around with the gain value to compensate for that change, though I'd assume I would have had to lower it. This seems opposite to your experience?

-Andy

 

My turbo seems to leaking some oil from the exhaust side ... could this be a symptom of boost spike?

I dont nkow what to do... either sell it and get a new turbo (GT35R), or rebuild it

 

are you sure it's not just a leaky oil feed line?

 

It dosnt seem like it is.... but theres smoke coming from the exhaust side of the turbo and i can deffinatly smell it.

My rotary mechanic says the exhaust oil seal is leaking just like on his T04R.. so i dono... it happened 2 weeks ago... didnt happen at all, all of last week (even when really pushing it)... and now this week its smoking again. I dono what to think, or do.

If someone would buy my kit, I want to go 500R, or else ill have to get a rebuild or GT35R

 

check your intake manifold

 

just being curious...but what else could possibly cause boost spike on a single turbo setup? Just curious?

 

malfunctioning of the wastegate or boost controller.

 

so my car just started boost spiking. I have a RX6b, so no wastegate there. I also have the AVC-R and haven't touched it. And at the same time my EGT are reaching 800c. I thought it was a vac line at first but everything is still the same. Any suggestions on where I should look for this. Oh and the boost spiking occurs even with the AVC-R on the off posistion.

 

I wouldn't put it on the underside of any intake piping. If you get oil residue in any of your pipes from a leaking turbo thrust bearing or something else then it could settle in the vacuum hose and make the MAP sensor read incorrectly. Probably wouldn't happen, but definitely possible.