Ported MAF ends
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Teching In
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From: Henderson
Ported MAF ends I'm having some Trans. problems how can you tell or know if it has to do will ported maf ends on an A4 car.Or what are the problems they give to A4 cars? <img src="images/icons/confused.gif" border="0">
Re: Ported MAF ends The problem w/ ported MAF ends on an A4 is that it reduces the line pressure at WOT, causing additional clutch slippage. The stock PCM looks at a few different variables to determine transmission line pressure at WOT, and the MAF flow is one of them. When you port the MAF, it's reading less airflow than it would with a stock MAF. The reduced airflow reading reduces the line pressure, and it'll wear the clutches in the trans much quicker. What specific problems are you having?
I had Ed Wright set my trans line pressure to vary directly with my throttle position sensor (TPS). This way, you're always sure to get max line pressure at WOT.
I had Ed Wright set my trans line pressure to vary directly with my throttle position sensor (TPS). This way, you're always sure to get max line pressure at WOT.
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Re: Ported MAF ends Hey Trevor- That's some interesting info.
I've had ported MAF's on 3 of my 4th Gen's and drive the shat out of them and never had a problem.
I've read some people saying they've heard of this but no one has posted any readings from A -tap and proven the MAF air flow is directly responsible for clutch/line pressure and related trans failure.
It is my understanding a lot of varibles/sensors control line pressure, most notably, throttle position when PCM is in open loop, is the main input. The MAF reading is not directly responsible for line pressure in OBD-II, but is related to over all PCM equation.
I'd always figured one of the aftermarket MAF makers started the rumor to control cheaper ported MAF's outselling thier $300+ units.
If you have some hard data or info supplied by Ed Wright or anyone else on how MAF reading controls line pressure, please post as I don't want to be replacing a trans in the near future. At the same time, I don't want to get rid of my MAF on an internet rumor.
<img src="images/icons/confused.gif" border="0">
I've had ported MAF's on 3 of my 4th Gen's and drive the shat out of them and never had a problem.
I've read some people saying they've heard of this but no one has posted any readings from A -tap and proven the MAF air flow is directly responsible for clutch/line pressure and related trans failure.
It is my understanding a lot of varibles/sensors control line pressure, most notably, throttle position when PCM is in open loop, is the main input. The MAF reading is not directly responsible for line pressure in OBD-II, but is related to over all PCM equation.
I'd always figured one of the aftermarket MAF makers started the rumor to control cheaper ported MAF's outselling thier $300+ units.
If you have some hard data or info supplied by Ed Wright or anyone else on how MAF reading controls line pressure, please post as I don't want to be replacing a trans in the near future. At the same time, I don't want to get rid of my MAF on an internet rumor.
<img src="images/icons/confused.gif" border="0">
Re: Ported MAF ends [quote]Originally posted by Bone:
<strong>I'm having some Trans. problems how can you tell or know if it has to do will ported maf ends on an A4 car.Or what are the problems they give to A4 cars? <img src="images/icons/confused.gif" border="0"> </strong><hr></blockquote>
Really would help to know what problems
you're having? The ported MAF battle is
still that, a battle. A little more info
would help
<img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
<strong>I'm having some Trans. problems how can you tell or know if it has to do will ported maf ends on an A4 car.Or what are the problems they give to A4 cars? <img src="images/icons/confused.gif" border="0"> </strong><hr></blockquote>
Really would help to know what problems
you're having? The ported MAF battle is
still that, a battle. A little more info
would help
<img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
Thread Starter
Teching In
Joined: Dec 2001
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From: Henderson
Re: Ported MAF ends No NOS yet,yes I have an B@M cooler it doesen't get hot or smell burnt on any of them.Have done Atap when all this started and was perfect.I't does it when just driveing on the hiway or around town tis time! If I go WOT it shifts perfect threw all gears,but can't drive WOT all the time.This is my first F-body and so far I don't like it,guess I'm just old school,but no one around here can help me.
Re: Ported MAF ends Question your A-tap almost sounds like
PCM problem. Can you run a-tap and check
voltage at part throttle. Other option is
voltage of TPS sounds like possible low
pressure way beyond ported MAF. Irun a ported
and have no problems <img src="images/icons/confused.gif" border="0">
PCM problem. Can you run a-tap and check
voltage at part throttle. Other option is
voltage of TPS sounds like possible low
pressure way beyond ported MAF. Irun a ported
and have no problems <img src="images/icons/confused.gif" border="0">
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Thread Starter
Teching In
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From: Henderson
Re: Ported MAF ends When I bought the car it had the ported end on it.But the prob. is the 3 tranies. I've gone thru.Had two different shops doing the work but I't starts losing OD and drive(acts like not shifting into them at all).Last time I put a whole new trans in,new converter and case everything and now it's doing it again! The first trans was stock with 30000 on it,2nd had an Yank 3500 and a transgo kit,3rd Vigilante 3400 race clutches andnew everything.The 2nd and 3rd have less than 5000 on each,and they don't mess up at the track cause it hasent been.I haven't even got to race on the street because of the problems.
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Verdad Gallardo Re: Ported MAF ends Two questions:
1) Are you spraying on these?
2) Are you running s cooler?, does the fluid
smell burnt ?(really 4 questions) <img src="images/icons/confused.gif" border="0">
3) Have you A tapped the trans. to check
voltage of solenoids? <img src="gr_stretch.gif" border="0">
[ March 03, 2002: Message edited by: las vegas hawk ]
[ March 03, 2002: Message edited by: las vegas hawk ]</p>
1) Are you spraying on these?
2) Are you running s cooler?, does the fluid
smell burnt ?(really 4 questions) <img src="images/icons/confused.gif" border="0">
3) Have you A tapped the trans. to check
voltage of solenoids? <img src="gr_stretch.gif" border="0">
[ March 03, 2002: Message edited by: las vegas hawk ]
[ March 03, 2002: Message edited by: las vegas hawk ]</p>
