EMU Guys - Studder At Boost
 

Hey Guys, I know this doesn't exactly belong here but you guys are as close as is available in this forum.

I'm trying to get my F/IC tuned and I'm having trouble with the car shuddering when it enters boost. I have the 02 clamped at .38v starting at 1PSI. The injectors are stock.

The F/IC reads in PSIA so
14.7 PSIA = 0 PSI
15.7 PSIA = 1 PSI
16.7 PSIA = 2 PSI

I don't have the MAF hooked up.

I have attached the LOG file


% Fuel Increase
http://www.kingofl337.com/images/fuel%20map.jpg
Timing in Degrees
http://www.kingofl337.com/images/ignition%20map.jpg
Volts
http://www.kingofl337.com/images/o2map.jpg

Increase your clamp voltage to about .420

I tried as you suggested and didn't notice a difference in the cars behavior.

Any other ideas? I think it's stumbling from being too rich but I don't see what would cause it.

A clamping voltage of .47 would be neutral and the ECU would throw in no fuel. Maybe you are not getting the voltage to the ECU O2 line that you think you are.

I'll use one of the analog inputs and log the voltage at the ECU and see what I come up with.

Thanks for your help.

I know when using the EMB with larger injectors and no AFPR on later model cars (like a Protege), It always needed to clamp at 0 psi, or it would stumble, looks like your clamping at ~2psi?
The ECU's would always stay closed loop til 5K rpms, even WOT.

I wonder what your datalog shows.

Also I noticed your not running any extra timing in the "NA" region. Do you have to reset base timing with the AEM?

Does the AEM have a over-boost protection? (I made that mistake on MS once...LOL...) It was pre-programmed to 1.5psi..LOL... Tough to drive a bucking Coldside S/C even up the street (even partial throttle sees boost @ 1500rpm's--try going UP a hill)

I still have the voodoo box I was running before. I'm going to call FM and see if I can use just the clamp. If I can I'll log that data hopefully get it to work right in the FIC. According to the guys at AEM I shouldn't need to re-time the car.