Maxing the Maf

[JeffsLightning]

Has anyone heard that on 01's and 2's that if you max out the mass air flow meter(i.e. pulley) that the pcm goes to a default table which does NOT see the chip. This is when the maf sees 5.0 volts at least 3 times without a battery reset. Therefore there is a strong possiblity that you will run lean. I have been told that all the tuners know about it. Any input? Hopefully I misunderstood when I was told this. It could explain allot for why mostly 01's are burning up spark plugs with the bigger pulleys... Food for thought...Jeff

 

[J.D. Blackwell]

Have you talked to Jim D'Amore? If you haven't, give him a call. He will have the fix for that pretty soon.

 

[smokingozzy]

I talked to Jim @JDM a couple of weeks ago when I sent my chip to him for a reburn, He said his new 2001 programs took care of that problem!

 

[JeffsLightning]

Ok...I was told that also and just wanted to make sure that it was an issue with 01's and 2's. I have a few buddies who are NOT aware that if they do NOT have a current or up to date program they will run the risk of running lean. I ALMOST lost an engine because of the maf thing. I don't think most people are aware of this... Jeff

 

[Speedin Bob]

btt

what is the skinny on this one?

 

[JeffsLightning]

btt

what is the skinny on this one?

Bob if you are using different pulleys on either the crank or blower and you have an 01 or 02 L you run the risk of maxing out the maf(5.0 volts). When this happens 3 times without a battery reset your pcm goes to a default table for running the engine. In this default table there is not enough fuel for the aftermarket pulleys. This is where you run lean and start to burn things up....hope this helps. Jeff

 

[Speedin Bob]

Jeff,

Thanks for the info.

Not to cause 'issues' but I hope the tuners chime in with their thoughts, peacefully of course.

 

[JeffsLightning]

Jeff,

Thanks for the info.

Not to cause 'issues' but I hope the tuners chime in with their thoughts, peacefully of course.

Me too!

 

[LIGHTNINROD]

One 'tuner' has told me what he knows/thinks about the 'maxing of the MAF" but I'll let him speak his mind--I don't want to misquote him.

Dan

 

[Lightning Tim]

I had this happen on my blown stang many times. I had a Pro-m calibrated for my injectors(they basically up the voltage not actually a specific injector calibrated) But the Pro-m sucked and I switched back to my stock MAF. What would happen is the MAF could not read the amount of air going in because it was too much, therefore it couldn't tell the computer to add fuel when needed. So the computer goes into default mode. So I think there is a certain area of HP when the MAF will peg. You just have to read and watch the voltage on a dyno to make sure everything is cool. But I guess you can compensate with a chip so I dunno. Anyway that is what happened with my stang, I dunno if the Lightning is the same.

 

[Jim@JDM]

Yes there is a five volt concern on the 01 and 02's.
The 01 and 02's PCM's have the same format as the Ford car line.
You Mustang owners will know what I am talking about.
If you hit the five volts one time the PCM will do nothing.
The third time you hit the five volts the PCM will think that the maf is broken and it will go to a default table.
Yes we can tune a default table. The default table is a third of the size of the main mass air transfer table which makes it hard to tune and will not be accuate in all areas.
The other problem is the in riching program than the 01 and the 02's have.
It adds fuel and timming.
Timming is the problem.
As a tunner this is one of the things that I do not like to see.
It adds as much as three degrees of timming over and above than what we are commanding.
That is why most of spark plug issues happen at WOT and over 100 MPH , that is were the timming is added.


I am currently testing our new 100mm mass air meter.
If the meter is bigger it slows down the speed of which the air passes through.
Which will give you a low voltage.
I have it on our 01 right now and in tunning too.
It has been on for the past five weeks. I should be releasing it in two to three weeks.
I am very happy with it and the tunning with it.


Hope this helps
Jim@JDM

 

[smokeshow]

what will a 100 mm cost.. cuz i may just hold out on the 90 and get a 100 then..

 

[Bad as L]

TTT

 

[ally68]

What makes you max out the mass air meter?

 

[Bad as L]

Ally68
All a MAF sensor does is reads the air flow and then converts it into a votage reading so the computer knows how much air is entering the engine. (basically).

The voltage starts out at roughly .5 volts at an idle and will max out at 5.0 volts when the meter reaches its limit. Now the meter will physically flow more air but the electronics stop registering at about 5.0 volts. So when the computer sees the 5.0 volt limit it cant see anymore airflow than that. Even though the truck might be pulling in more air the computer can't see it or read it so to speak. So then the system MAY go lean, because it has exceeded the limits of its sensors.
(This might become a problem on some trucks on cold days with really big overdrive pulleys on the blower and maybe some good exhaust.)
I hope this made sense
Dale