New MAF results

RobC · 06-07-2002, 06:14 AM

Picked up a new MAF yesterday from the dealer. Price out the door was $219. Very straightforward installation.

I did MAF, torque, and boost measurements, but did it through 3 gears instead of just second.

Max MAF flow went up from 206 up to 248 g/s.
Max torque went from 312 up to 353 lb-ft.
Max boost dropped from 18 to 15.6 psi.

I find the drop in maximum boost pressure to be interesting. I thought it would have stayed constant compared to old MAF.

Time to go to the track again to see what difference this makes. Butt dyno says noticeable improvement and much more power from 5000 to redline now.

My old graphs

veryfastS4 · 06-07-2002, 06:22 AM

Rob, I'm not at expert with the internals of our car and wanted to know how you can tell if the MAF is problematic. Does the check engine light go on? or can this only be diagnosed through a VAG tool?

RobC · 06-07-2002, 06:29 AM

If your MAF is really out of whack, you will get error codes showing a lean or rich condition. In my case there were no CE lights, no errors codes, just a hunch that I was down on power. So when I measured my MAF rates and compared with other chipped S4's on AW, I found that my numbers were closer to stock (I'm chipped).

Install is very straightforward. The MAF sensor is located at the top of the engine between the air filter box and the Y-tube at the top of the motor. There are 2 clips that hold it on one end and a band clamp at the other. The only hard part is getting the flexible black intake tube back onto the MAF because of the tight fitting rubber gasket. Some patience and a very small flathead will help you get the job done.

There are others on here that are much more knowledgeable with MAF failures and symptoms. This is pretty new to me too, though I'm on the way to becoming an expert

.

veryfastS4 · 06-07-2002, 06:43 AM

The reason I was curious about this was because my friend who has an altima needs to get his MAF changed. His dealership was going to charge him $500 for the part and labor.
So being the curious and inquisitive individual that I am, I thought maybe I should look into that part on my car. How long did this take?

Wouldn't your MAF be replaced by the dealership for free? Wait, maybe not since you didn't see any error codes and dealership don't change things unless there are problems, right?

Nick Gustas · 06-07-2002, 06:54 AM

go get those mid 13s

RobC · 06-07-2002, 07:03 AM

Audi typically won't replace a part unless it's obvious that it's bad, such as error codes, etc. Plus they have begun to blame all kinds of failures on chips. I'll just bite the bullet and pay for it out of pocket.

It took about 2 minutes to get the MAF off, and maybe 10 minutes to get it back on. The first time I tried I didn't use any tools. I found that it was impossible to simply "press" the plastic tube onto the MAF due to the rubber gasket. So eventually I dug out a small flathead to help guide the rubber gasket over the MAF. On the S4 it should only take about 15 minutes.

On the Altima you will need to do a visual inspection to see where the MAF is. On my previous Maxima the MAF was at the top of the engine and probably would have taken about 20-30 minutes since much of it was bolted together.

mpwolf · 06-07-2002, 07:20 AM

You're only getting 2.5 samples per second. You can get about 3.3. Just go to the options screen and type in:

Blk Int: 25
Char Int: 0

Just like this:

It will speed things up a bit.

Dangler {/KAWF} BUMP · 06-07-2002, 07:48 AM

DarinS4Turbo · 06-07-2002, 08:21 AM

Prodigy · 06-07-2002, 08:41 AM

06-07-2002, 06:22 AM	#2
veryfastS4 Member Garage is empty, add now Join Date: Jun 2000 Posts: 3,010	So was it an easy install? How long? Rob, I'm not at expert with the internals of our car and wanted to know how you can tell if the MAF is problematic. Does the check engine light go on? or can this only be diagnosed through a VAG tool? __________________ Please use the classifieds

06-07-2002, 06:29 AM	#3
RobC AudiWorld Super User 2013 Audi S6 My Garage Join Date: Mar 2000 Location: Duluth, GA Posts: 2,500	Re: So was it an easy install? How long? If your MAF is really out of whack, you will get error codes showing a lean or rich condition. In my case there were no CE lights, no errors codes, just a hunch that I was down on power. So when I measured my MAF rates and compared with other chipped S4's on AW, I found that my numbers were closer to stock (I'm chipped). Install is very straightforward. The MAF sensor is located at the top of the engine between the air filter box and the Y-tube at the top of the motor. There are 2 clips that hold it on one end and a band clamp at the other. The only hard part is getting the flexible black intake tube back onto the MAF because of the tight fitting rubber gasket. Some patience and a very small flathead will help you get the job done. There are others on here that are much more knowledgeable with MAF failures and symptoms. This is pretty new to me too, though I'm on the way to becoming an expert . __________________ Robert Cheng 2010 S4, 6-spd, Meteor Gray, Prestige, Sport Diff, Strat shifter, H&R Rear Sway 2013 S6, Estoril Blue, B&O, LED, cold weather, comfort seats, 20", rear shade, BBS CH-R 20x9 ET25

06-07-2002, 06:43 AM	#4
veryfastS4 Member Garage is empty, add now Join Date: Jun 2000 Posts: 3,010	Thanks Rob... The reason I was curious about this was because my friend who has an altima needs to get his MAF changed. His dealership was going to charge him $500 for the part and labor. So being the curious and inquisitive individual that I am, I thought maybe I should look into that part on my car. How long did this take? Wouldn't your MAF be replaced by the dealership for free? Wait, maybe not since you didn't see any error codes and dealership don't change things unless there are problems, right? __________________ Please use the classifieds

06-07-2002, 06:54 AM	#5
Nick Gustas Senior Member Garage is empty, add now Join Date: Mar 2000 Posts: 7,469	I bet the boost went down because the ECU was now hitting a target without working so hard. go get those mid 13s

06-07-2002, 07:03 AM	#6
RobC AudiWorld Super User 2013 Audi S6 My Garage Join Date: Mar 2000 Location: Duluth, GA Posts: 2,500	Exactly.... Audi typically won't replace a part unless it's obvious that it's bad, such as error codes, etc. Plus they have begun to blame all kinds of failures on chips. I'll just bite the bullet and pay for it out of pocket. It took about 2 minutes to get the MAF off, and maybe 10 minutes to get it back on. The first time I tried I didn't use any tools. I found that it was impossible to simply "press" the plastic tube onto the MAF due to the rubber gasket. So eventually I dug out a small flathead to help guide the rubber gasket over the MAF. On the S4 it should only take about 15 minutes. On the Altima you will need to do a visual inspection to see where the MAF is. On my previous Maxima the MAF was at the top of the engine and probably would have taken about 20-30 minutes since much of it was bolted together. __________________ Robert Cheng 2010 S4, 6-spd, Meteor Gray, Prestige, Sport Diff, Strat shifter, H&R Rear Sway 2013 S6, Estoril Blue, B&O, LED, cold weather, comfort seats, 20", rear shade, BBS CH-R 20x9 ET25

Welcome to AudiWorld!
		Welcome to AudiWorld.com. You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join AudiWorld.com today!

06-07-2002, 07:20 AM	#7
mpwolf AudiWorld Expert Garage is empty, add now Join Date: Oct 2001 Posts: 30,420	Change the settings on your VAG...see inside You're only getting 2.5 samples per second. You can get about 3.3. Just go to the options screen and type in: Blk Int: 25 Char Int: 0 Just like this: It will speed things up a bit. __________________ \| 1989 BMW M3 \| TMS J-Stock \| Bimmerworld Cage \| iigomotiv \| OMP \| \| Borla \| UUC \| Cobalt Friction \| Kosei \| Toyo \| BBS \| Bridgestone \| V1 \| \| 2005 Kawasaki Ninja ZX-6R \| Pearl Magma Red \| \| 8 Throttle Bodies...B!TCH AIM: mpw8888 MSN Messenger: mpwolf@hotmail.com Yahoo!: mw007e

06-07-2002, 07:48 AM	#8
Dangler {/KAWF} BUMP Member Garage is empty, add now Join Date: Mar 2000 Posts: 2,435	Did someone say there's no MAF on a 2001? __________________

06-07-2002, 08:21 AM	#9
DarinS4Turbo AudiWorld Super User Garage is empty, add now Join Date: Feb 2001 Posts: 2,185	Nope, just a better one that doesn't break all the time. __________________ 2006 A6 3.2 S-line

06-07-2002, 08:41 AM	#10
Prodigy Senior Member Garage is empty, add now Join Date: May 2001 Posts: 7,855	I concur __________________

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode