I never had a bucking problem VTA, only an engine cutting out problem.

 

Maybe what you call cutting out and what we call bucking are the same thing?

 

Get rid of the AFM?

 

no. i mean 0rpms are hard to mistake.

 

Ok, your car is busted.

 

no, it's why a huge vacuum leak on a metered engine sucks.

 

...literally :gay:

 

Lol

 

Well, I just went for a nice little jaunt to test out the O2 clamp just installed. My freeway cruising jerkiness seems to be about 50% gone. At 75-80 though, I'm still in that grey area where a breath on the pedal takes me from -10vaccum to 8psi in an eyeblink. I honestly think that the turbo is spooling and making positive pressure while the manifold is still in vaccum and the boost is just going straight out VTA. I can hear the turbo wind up and can modulate the gas to keep the BOV open. I can hear both working at the same time... my record is about 6seconds, during which time, the car will jerk like crazy (but a lot less now due to the 02Clamp).

Olderguy's instructions say don't adjust the little brass screw on the clamp unless I've got a voltmeter. Can I adjust it a little bit pretty please if I mark where it was when I started just to expiriment? If so, what am I looking for in response. Is moving that little brass screw going to do something I can feel.
Also, it comes set to "clamp" at .5psi... any reason I should want it to wait until more boost to clamp.
What should I be trying to feel wrt driveability to "tune" the thing... or is most of it stuff to mess with on the dyno?

 

You can increase the boost pressure setting by turning in the allen screw on top of the switch clockwise. I run mine about 1-1.5psi so that I don't hit clamp at high speed cruise.

Changing the voltage to the ECU during clamping should be done with a digital voltmeter. It is set to send a pretty lean signal. Counterclockwise will make the signal more rich, but it is very sensitive.

 

Yeah, I can guarantee you're turbo's producing boost at freeway speeds and spitting the excess out the bypass valve. I can clearly hear my bypass valve venting on the freeway...it's built into the compressor housing (recirculating) and it makes quite a bit of noise at those speeds.