EdP

Your chip is custom, is it not Mike? Noone else has your program..

EdP

from VACUUM. So taking in account sealevel, you get a sensor range of 1.5 bar in <b>practical</b> terms (accounting for variance and overhead). In simple language, the sender makes 5.0v whether it senses 1.5 bar or 5 bar of pressure. There is NO WAY for the ECU to know what the pressure is above 1.5 bar. Anyone can fool themselves into thinking the sender can sense more, but you can't wish a part into doing something it can't.

dingster

I am aware of that. APR told me the same thing. I don't see how that has anything to do with the DTC. If the upper boost limit is set higher than 1.5 bar than theoretically you'll never get that DTC. Currently my stg3 spikes pass 1.5 bar and I never had that DTC.

What my point was that it seems like someone's trying to say that GIAC runs too much boost but that DTC is actually there to indicate a hardware failure where the actual boost goes above requested boost by a preset value.

EdP

not questioning your post.. as for the dtc, you CAN adjust the headroom of error factor, so that momentary spikes won't cause it to throw a code, or worse, fall into limp mode. I've been told Mikes car does this above 6k, and no doubt thats the issue. 1.5 bar is (if my math isn't off) - 22 psi, not accounting for the coded headroom to account for variance.

dingster

I don't think it's a good idea to adjust that head room since the DTC is designed to detect hardware failure and put the car into limp mode. I had a leaking DV and had a DTC for negative boost dev. and the car ran into limp mode. APR could raise the headroom for that error factor but then it probably won't detect the leak in the DV and defeats the purpose of the DTC.

BIG NIPPER

But my car hasn't gone into limp mode because of the DTC. What gives?

EdP

analogous to the revlimiter - there are two ya know, as I'm sure. the soft one, then the hard one. Perhaps the overhead is similar in that a code is thrown for the "soft" limit, then a "hard" cutoff that throws the car into limp. I'm just guessing.

BIG NIPPER

As they said before, check the hoses to the wastegate frequency valve (Which I don't know where the hell they are at) and also check my BPV.

EdP

also check for kinked vac lines, especially ones to the wastegate.

dingster

The waste gate or boost frequency valve is attached to the hose that goes from teh airbox to hte turbo. It's a little electronic module with three vac lines going into it.