Does Porting MAF-Ends Hurt an A4?

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May 18, 2002 | 08:49 AM

Vettepartz

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From: Albuquerque NM

Does Porting MAF-Ends Hurt an A4?

I have seen references to the A4 wearing out sooner if you are running ported MAF-ends because of vacuum changes. Does this apply to the A4 in a C5 Corvette, or just the F-bodies? I plan on porting mine and re-tuning with LS1-edit.

May 18, 2002 | 09:17 AM

vstella

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From: Coral Springs Florida

Re: Does Porting MAF-Ends Hurt an A4? (Vettepartz)

No problems with pulling the screen....be careful removing ..don't touch the sensors.:D

May 18, 2002 | 09:48 PM

Vettepartz

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Re: Does Porting MAF-Ends Hurt an A4? (Vettepartz)

TTT

May 18, 2002 | 09:59 PM

Caveboy

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From: Brisbane CA

Re: Does Porting MAF-Ends Hurt an A4? (Vettepartz)

I heard it doesn't work well with powerloader because the incoming air is not deflected properly

May 18, 2002 | 10:03 PM

VERTVETTE

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From: Brandon FLorida

Re: Does Porting MAF-Ends Hurt an A4? (Vettepartz)

A tuner told me he has seen where they have lowered dyno #'s in some cases :confused:

May 18, 2002 | 10:26 PM

ToplessTexan

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From: Murphy TX

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Re: Does Porting MAF-Ends Hurt an A4? (Vettepartz)

Not vaccuum so much as load. A few of the line pressure related parameters are functions of delivered torque. An artificially lowered load (e.g. as a result of the MAF ends) causes a corresponding lowering of the computed TQ values, in turn resulting in lower line pressures.

I guess I'm not yet convinced that big cam MAP changes toast the A4. I'd like to see some quantification of that first.

May 19, 2002 | 12:50 AM

Vettepartz

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Re: Does Porting MAF-Ends Hurt an A4? (ToplessTexan)

Topless Texan, I agree that I would also like to see something more qualifying that supposed result. Also, I think that all else being equal, more air air from the MAF would signify a higher load and not an artificially lowered one, such as encountred when going up a hill. What am I missing here?

May 19, 2002 | 01:09 AM

ToplessTexan

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From: Murphy TX

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Re: Does Porting MAF-Ends Hurt an A4? (Vettepartz)

Two different issues... a) larger than spec diameter MAF ends and b) reduced vacuum with big cams. The first is a legitimate concern, it's the second (not really what you were asking about) I'm not sure about. (More specifically I just haven't seen the connection yet.) You don't get "more air" with larger ends, you do get reduced velocity through the sensor. I'm in the "don't dork with the MAF ends" camp. :)

[Modified by ToplessTexan, 11:12 PM 5/18/2002]