Mass Air Flow Meter?

[NEPatsFan]

By adding a cold air system or a Mass Air Flow Meter, it allows the car to breathe in better. What is a Mass Air Flow Meter, where can I purchase one?

[merc406]

Go to --jegs.com-- or SummitRacing.com-----Order their cat's for price variations and product variation's.

[MAD-3R]

A mass airflow meter is one the car, just behind the Air filter.

[RF Overlord]

PatsFan:

Replacing your MAF will require the use of a chip, or an ECM re-flash. Both FordChip and Dennis can provide everything you need...

This link (http://www.autoshop101.com/forms/h34.pdf) explains what a MAF is and how it works, better than I can...

[RCSignals]

Does the MM MAF need to be replaced? I thought the stock MAF on the Marauder was a good one

[TripleTransAm]

Originally posted by RCSignals
Does the MM MAF need to be replaced? I thought the stock MAF on the Marauder was a good one


Precisely. Has anyone seen evidence of the stock MM MAF posing a sizeable restriction to the intake air path on a stock 4.6l DOHC?

Side note: on F-body LS1s (mostly the early ones like the '98), the popular MAF mod was to take apart the MAF ends, port them and remove the grids. One might think this was merely to allow more airflow, but the real benefit was the modification to the A/F ratio. Turns out the '98 LS1 runs pig rich on acceleration (perhaps an intentional 'safety valve', given it was the first year of the LS1 in the F-boies). By porting the MAF ends and removing the protective grids, more air could be ingested by the engine without being picked up by the small hot wire sensor. Hence, a leaner overall mixture. This may not be directly applicable to the 4.6 DOHC, but it's something to keep in mind if anyone ever thinks of porting their stock MAF... it may cause the engine to go lean.

[Warpath]

For Mustang Cobras and GTs, a change of MAF didn't add much benefit to a stock engine. The bottleneck is in the intake. You can install a new MAF without a chip. The MAF just needs to be calibrated to match the injectors you are using. I don't know how its calibrated. If you do need or want a larger MAF, either use a Ford MAF (like the 90 mm Lightning MAF) or a Pro-M MAF (http://pro-flow.com/Ford/front.htm). Those are the only MAFs Fordchip.com recommends.

[darebren]

why not get higher flow injectors too? I think Dennis was looking into all this last year, wonder if he has anything yet??

[TripleTransAm]

Originally posted by darebren
why not get higher flow injectors too? I think Dennis was looking into all this last year, wonder if he has anything yet??


It's Sunday morning and I'm still half asleep, but I can't think of any reason one would need higher-flow injectors unless the current stock injectors were max'ing out on delivering fuel. I suppose that's a situation one would only see on a blown or turbo'ed 4.6l setup, *maybe* some with ported heads or other air-flow-enhancing mod.

Injectors have a maximum pulse-width they can sustain (ie. the maximum amount of time 'on' during their cycle) before they effectively stay 'on' all the time.
ie. if the injectors are being commanded to stay on 80% of the time during their window of operation, but the remaining 20% of the time is spent 'reacting' to the command itself (ie. switching to 'off' or switching to 'on'), then they'll 'float' (much like a valve will float at high RPM) and effectively stay 'locked' on. The result is uncontrolled fuel delivery.

If your engine setup requires much more fuel delivery than stock, and you reach the point where your stock injectors 'lock' on, then your only choice is to go with bigger injectors and decrease the pulse-width to something manageable. I'd be surprised if a stock-ish engine ever got to this point.

[Dennis Reinhart]

First of all I see no benifyt to changing the Maf, and if you do it will need the air meter transfer funstion changed with a chip, now Mark Ray at WWW.ZeusAutomotive.Com is my friend and he contacted ProAmm and they have sent him meters to test and I believe he is seeing a more than a 7 RWHP gain, with out having to change the chip or use one on a stock car, but these meters are not cheap, but I have not see A/F of the car and see if the meter leaned the car out. for the most part our meter is fine, our car has 24 pound injectors this is plenty for what most of us do, on Kieths car with the blower I have gone to 42's, and this req custom tuning also, it also req a Speacial Proam meter made for me, with a built in IAT, so again I am working on the cold air kit as we speak.

[ghost]

Originally posted by TripleTransAm
It's Sunday morning and I'm still half asleep, but I can't think of any reason one would need higher-flow injectors unless the current stock injectors were max'ing out on delivering fuel. I suppose that's a situation one would only see on a blown or turbo'ed 4.6l setup, *maybe* some with ported heads or other air-flow-enhancing mod.

Injectors have a maximum pulse-width they can sustain (ie. the maximum amount of time 'on' during their cycle) before they effectively stay 'on' all the time.
ie. if the injectors are being commanded to stay on 80% of the time during their window of operation, but the remaining 20% of the time is spent 'reacting' to the command itself (ie. switching to 'off' or switching to 'on'), then they'll 'float' (much like a valve will float at high RPM) and effectively stay 'locked' on. The result is uncontrolled fuel delivery.

If your engine setup requires much more fuel delivery than stock, and you reach the point where your stock injectors 'lock' on, then your only choice is to go with bigger injectors and decrease the pulse-width to something manageable. I'd be surprised if a stock-ish engine ever got to this point.

[VOICE OF ELDER NINJA]: You are wise TTA. Your years of F-body modding has taught you well. :up:

24# fuel injectors running at an 80% duty cycle @45 p.s.i. and a 0.45 BSFC can support 347 HP.

A stock engine will not exceed this without N20, forced induction or internal mods.

Eric