Tuning MAF for SD like throttle response

[formula934]

Hey guys,
I just finished up my H/C/I daily driver (02 WS6) and dialed in the VE tables along with the MAF calibration using HP tuners. While doing so, i noticed night and day differences between SD throttle response and the MAF throttle response despite the MAF tune being close to perfect. It just seems like the MAF isnt as responsive as the car being in SD mode for part throttle conditions and this is on a 11.1 setup with a very torquey 228r 112lsa cam and ported fast 92 with ported ls6 heads, full exhaust, SLP 85mm Maf, which has great throttle response to begin with. I began doing alot of research and the only thing i could come up with is that the MAF filtering tends to be slower due to more sensor input and variables to derive proper fueling than just having MAP,IAT, and VE for SD. It seems that charge temperature coefficents and tampering with this table by increasing the values has some better throttle response for some other people with MAF cars. Has anyone explored the MAF tables more in depth specifically relating to getting better throttle response by making it react quicker to sorting through information (i.e temperature, ve tables,airflow etc). There doesnt seem to be too much info out there on this.

[pajeff02]

Other than maybe checking the HP Tuners forum, I haven't a clue. Benefit of a MAF obviously is that you are actually measuring the incoming airflow rather than estimating it. This being said, a lot of guys run their cars on an SD tune without issue.

[SMWS6TA]

It also differers between model yrs and MAF as well.

98's have different ecm vs the following yrs. It's easier to tune 99 < because they have a different ecm plus software that allows for more inputs from the maf. At least that's what I understand what my tuner explained to me when he did my SD tune.

Being at sea level all the time the car is very snappy in throttle response. More so in colder temps.

[Naaman]

FBJ could write a book on this topic. I don't fully understand "why" SD has better throttle response, but according to everything I've read, it just does.

[SMWS6TA]

I believe it's because the ECM doesn't have to wait for the MAF sensor to populate the data into the tables for it to make it's adjustments to fuel and timing.




You're right on FBJ.