Hey people,

I ocassionaly see "gutted MAF" in peoples signatures. What does this mean, and what does gutting a MAF involve. IS it just taking off the screens around it or what?

Also what kind of gain can I expect from it?

Thanks,

-Max

-'86 TA 305TPI 700R4

 

you can expect no streetable gains in horsepower, you will probably jack up the MAF if you aren't careful by hitting the wire in the middle of it..

essentially it entails tearing off the screens on the front and rear of the MAF..

you would be better of with a throttle body airfoil.

just my $0.02

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Webmaster: www.IROC-Z.org

 

airfoils are good, but you can always just buy an aftermarket MAF, so you can put the stock one on for emissions testing.But I'm not sure how much power differnce you'd really see with the new MAF.

 

OK, but whats the point of tearing down teh screens? Just to let the tiny amount of air the screens blocked through, thast it?

I though this involved taking out teh original MAF and putting it closer to the cold air somehow making more power, sounded a little iffy...

Well never mind then if it does nothing I'm not gonna bother.

-Max

 

doesn't do jack, to be honest..

some guys 'swear' the cooling fins increase CFM, what a buncha BS..

the MAF can only compute a certain amount of CFM, beyond that the ECM can't adjust, so why screw with it? you would need an ECM that could take the higher flow readings which would cost you a bundle...

leave it as-is and get another 1 hp somewhere else, like advancing your timing 1 degree or farting when you stomp on the gas

one of those other 'useless' mods is adjusting your TPS to make your car run richer. what a waste of money to burn up all of that gas when you could easily get the power from throwing in some platinum plugs with 8.5mm wires..

sorry, rant off

------------------
Webmaster: www.IROC-Z.org

 

The MAF is a worthless mod on a stock 305. It is not the restriction. It can flow more than your 48mm throttle body.

You will be risking $140.00 and a code 33 by attempting it trying to acquire a supposed HP gain that doesn't exist.

Port the plenum, put on a cap/coil/rotor kit, good plug wires, etc.

If you want more details about this mod click the pic below:

Enter Site
Choose Tips
Choose Removing MAF Screens

By the way, just my opinion, the air foil and TB bypass are just as worthless as HP mods go.

~~~~~~~~~~~~~~~~
<FONT SIZE="2" COLOR="red">Red 86 T/A</FONT><FONT SIZE="2"> 5.0 TPI</FONT><FONT SIZE="1"> </FONT><FONT SIZE="2">(LB9/WS6)
~HyperTech Cap/Coil/Rotor/AFPR
~Derale Adjustable Fan Switch ~ 170° Stat
~Flow Matched Injectors ~ K & N Air Filter
~Ported Plenum ~ Pirelli 245/50/16
~SLP TB Airfoil
~All Else Stock</FONT>

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I assume you are talking about removing the fins doesnt increase CFM... Well if thats what you think, you are totally wrong. Any obstruction in the path will slow the rate of airflow down, no matter what it is.

 

Make sure to cover both ends of the sample tube with duct tape to protect the wire from chips/debris. Also if using a bridgeport, remove one fin at a time and allow it to sit awhile to cool off. Excessively quick machining and/or a dull cutter really build heat and fry the electrinics. A hacksaw works pretty good in a pinch, just assemble the blade through the sensor.

It does change the calibrations a little. It leans the upper RPM's which usually results in some gain as GM leaves this overly rich. Of course tuning the chip is the best bet. And yes, it increases airflow maybe overkill on a 305 but this is going on a 388.



[This message has been edited by JoelOl75 (edited July 16, 2001).]

 

true, but the ECM can only compute a certain amount of CFM, beyond that it's useless..

personally, i feel you could get alot mroe CFM by porting your plenum and port matching your gaskets to the runners and intake..

i dunno, maybe i'm just picky and don't like cutting up my cars, lol

 

True it only reads upto 255gm/sec, but once you're in PE mode the MAF is ignored and it's running open loop anyway so actually it does matter at higher rpm's because it's still a restriction. The MAF measurements are only used in part throttle fuel economy and I don't expect to cruise around at 5,000RPM and get closed loop fuel control.

The 255 limit doesn't mean it can't support engines with air requirements well over that, it just means closed loop control cannot be maintained.

 

Absolutely correct about the sorry excuse for an ECM. Damn GM, why didnt they figure out when they programmed these cars that we would be messing with them?

I dont really agree about the CFM's entirely though... I subscribe heavily to the whole mustang theory of huge MAF's, large TB's and ported intakes. Ive always had good results on those doing that, I cant see why a GM engine would behave any differently... its a V8, has FI, so on so forth. Maybe someday I can test my theories on a GM and get some concrete results, good or bad.