ECMlink question about maf comp sliders

[95tsiawd0330]

Hey guys I just changed my car over from SD to a GM maf because I was having a hard time trying to get me VE table dialed in good so I went to a GM maf so I can have my VE table dialed in by the maf then go back to SD.

But my problem that I'm concerned about is that I have to go so negative like -20% around 800hz to 1100hz on my maf comp is this normal? And with a dip like this wouldn't it cause my VE table to have a big drop in the VE chart

By the way I'm using the ECMlink gm maf cable so at idle my mafHz are at 600Hz but I know that's normal, but will this cable cause me to have to go so negative. I would post a log but just. Noticed I'm not allowed to post logs in this.forums but that fine I just need to know if it normal to so negative

Come on guys 47 view and no one can answer a simple question if. being -20% on comp sliders if that is normal

 

[Afizzle]

I was helping a friend dial in his gm maf and he was having 25% adjustments because he didn't have the correct settings on the maft or whatever.

 

[Hal]

You need to reset everything back to factory defaults and start over.

You've changed so many things.

How in the hell do you come up with a 50usec swing in individual cylinder dead time???

Stuff like this, battery offset, etc. should only be adjusted after everything else is correct.

Hal

 

[95tsiawd0330]

You need to reset everything back to factory defaults and start over.

You've changed so many things.

How in the hell do you come up with a 50usec swing in individual cylinder dead time???

Stuff like this, battery offset, etc. should only be adjusted after everything else is correct.

Hal

well this is what tom at ecm give me when he tested my 880 injectors (bench test)

also were do you see so many things changed i set my injectors smoothed out da table changed battyadjusted to toms figures slowed down my o2 feed back because wb was reading to fast for ecu to keep up

 

[edged1g]

slowed down my o2 feed back because wb was reading to fast for ecu to keep up

You have the same thing posted in the ECMTuning forums and Dave's response was

That's not what I said. I said that you are seeing a normal indication and that the WB's reaction to to the fuel cut is simply delayed.

This delay is in part due to the amount of time it takes the small amount of exhaust flowing to reach the sensor. Since you are using the front O2 sensor input, I assume that you have the WB's sensor in the front O2 location. If so, the delay in the exhaust reaching the sensor is the same as it would be for a stock NB O2 sensor. I don't see where this is having any significant effect on engine operation.

Dave

So you have changed things based on a theory that the creator of the software has told you is invalid.

As for your 20% MAFComp adjustments, from here

NOTE 1: We absolutely must make mention of the fact that GM MAF outputs WILL vary from car to car. Most variations should be minor and easily corrected. However, it's not at ALL unusual to see a GM MAF installation require up to 30 or 40% adjustment from our base configuration! It's simply the way the GM MAF works. If you vary the size of the piping around the GM MAF, its output is going to vary accordingly.

So it is POSSIBLE, but you may need to rule out things like boost leaks and possibly post a picture of your MAF configuration.