85mm maf question

**1999slpss** · 04-27-2011, 10:47 AM

I bought my car with a Pace "calibrated" 85mm truck maf. I always noticed a pause/hesitation in acceleration around 2500 rpm. One day I decided to put a stock one on that I had laying around. No more hesitation after that and it felt like it pulled better. But the 85mm maf nets about 1-2 mpg better.

I see a lot of people run these. Has anyone else had a similar problem with them?

BTW: the maf tables were not altered from stock when the first owner had it dyno tuned by speed inc.

**Blue28** · 04-27-2011, 11:37 AM

You really need to get it retuned, for that MAFS, otherwise it throws everything off.
I had the same problem years ago (+6) and just went back to a stock MAFS since I couldn't justify getting it tuned just for the MAFS.

**1999slpss** · 04-27-2011, 11:51 AM

Yea I'm not wasting money for that. I'll continue to run the stocker. I was just wondering if it was just mine or if others had this issue.

**KMdef9** · 04-28-2011, 06:21 AM

Honestly, you won't see many people doing a MAF mod. As mentioned before, it really isn't worth the minimal gains. A smooth bellow has 10x the bang for the buck versus a bigger/modded maf.

**Mr. Luos** · 04-28-2011, 07:17 AM

That aftermarket MAF leans you out....thus gaining power.
But not safely.

It is basically how they all operate.

**1999slpss** · 04-28-2011, 08:20 AM

Originally Posted by Mr. Luos

That aftermarket MAF leans you out....thus gaining power.
But not safely.

It is basically how they all operate.

Yea my a/f on the dyno with the stock maf was 11.5 so I guess when the 1st owner had speed inc. dyno tune it the bigger maf put the a/f in the range they were looking for so they didn't bother changing the maf or VE tables.

**TA98** · 04-28-2011, 08:06 PM

Originally Posted by Mr. Luos

That aftermarket MAF leans you out....thus gaining power.
But not safely.

It is basically how they all operate.

you can correct the transfer functions though so that it works correctly allowing more air to pass through but reading the correct amount of air. correct?

**Mr. Luos** · 04-28-2011, 09:56 PM

Originally Posted by T/A98

you can correct the transfer functions though so that it works correctly allowing more air to pass through but reading the correct amount of air. correct?

You are referring to a tune correct?

That added airflow isn't worth MAF + Tune costs.

**TA98** · 04-29-2011, 09:12 AM

^^^^ yes

**Firebirdjones** · 04-29-2011, 09:53 AM

That is correct, you have to go in and recalibrate your MAF tables with the larger MAF so it reads the air correctly. That can't be done however until your VE tables are correct.
In the end it's a small HP gain, but most won't go through the cost of the MAF and the tuning.

Those of us with our own tuning software, it's not a big deal

I recently removed the MAF and went SD. I love it. Much better throttle response, more to my liking. No more MAF's for me.