Some might find this interestingl.....Is the MAF a Restriction??

I was tuning a car today and we tried a test to see how much of a restriction the MAF was on a car. I am not talking SD/Non-SD as the car is in SD. I know several are runing SD, but still have the MAF in place, just disabled. On this car, we did a run with it in place, and then another with a 4" tubing and 100mm MAF in its place. Now the MAF's isn't used at all, but the customer didn't have a piece of tubing big enough to use, so he improvised and found this setup. When his new 4" tubing arrives, he will be removing the MAF and just runing the tube. Very good choice on his part. ;)
The car is basically cam only, full bolt on with a 90/90. There is NO change at all in the tune from one run to the other.
Run #5 - Stock 78mm Screened MAF
Run #14 - New 100mm De-Screened MAF and tubing (Bigger) +16hp/15tq
Run #12 - Same as 14 with cutout open +23hp/22tq
http://www.greenlightmotorsports.com...ESTRICTION.jpg

Interesting, nice results. If I had a MAF I would remove it, but the I6 engine (until late 05 when they got MAFs) operates in SD mode from the factory!

Not what I wanted to see, but thanks.

Here is another example, same conclusion. This is Tim Tosto's N/A M6 422 cid HOSS Camaro. Main changes were dumping the MAF and going with a nice large air exchanger tube to connect to the lid. The car picked up from a 9.87@139 to 9.71@141 with just this change and reseting the A/F (it changed slightly when the MAF restriction was removed).

http://www.mccordcg.com/pcm/dynocharts/tosto_422.jpg

I don't feel so bad for selling my 85mm MAF for $20 bucks now (apples to oranges, but I got paid for my RWHP this time).

Thanks Chad - You made my night

Someone tell Mr. Diggler :)

Wow! So, everybody going out to dump their MAF now?

Quote:

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Originally Posted by Garry

Wow! So, everybody going out to dump their MAF now?

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Nah. Chad just proved what we already knew.

I have an LPE 100mm MAF sitting in the garage. I guess I should get a 4" coupler and hook it up. Thanks !!

:cheers:
joel

Did all these tests a few years ago on Project Monaro and found speed density to be a advantage even on a stock motor

http://chipmaster.com.au/page2.html

Nice looking new site Delco!!

So I guess my MAF is going when I do the mods this winter :)

Guys. I think some of you are missing the point of this. The car was done in SD, never with a MAF. The only difference is the physical opening of the intake track into the TB/Manifold. We used a 100mm MAF to compensate for a 4" piece of hose. The MAF was never activated. It just shows that if you have a smaller opening in the front of a bigger intake, then you could be leaving some power on the table.

No, actually I just love what the MAF does and assumed that it was a insignificant obstruction. Now I guess I need a MAF with a bigger hole.
Wanna sell that 100mm?

It is a LPE 100mm MAF. It was the customers unfortunately. I'll say this, man was it huge. :lol:

Quote:

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Originally Posted by Black02SS

It is a LPE 100mm MAF. It was the customers unfortunately. I'll say this, man was it huge. :lol:

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Here's a link to a related discussion. It's intertesting what Louis G has to say about the LPE 100 mm MAF and Big Cam Overlap/Reversion. FWIW

http://www.ls1tech.com/forums/showth...76#post5860076


Rumour has it that Nick Williams is working on a 100 mm TB. With a 100mm MAF the bellows and CAI should be the next bottle neck for the C5/6 guys (as Jason says in the linked thread).


:cheers:
joel

Having read all related links this is a somewhat confusing topic.
No one really seems to gain from changing from 75>85 mm maf.
As Bink and Katech point out what next if you just change to the 100mm MAF?
ie. what intake , filter?
SS, when you dynoed what was on the free end of the 4" MAF tube? filter?
Intrigued-

Quote:

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Originally Posted by Bruce Melton

Having read all related links this is a somewhat confusing topic.
No one really seems to gain from changing from 75>85 mm maf.
As Bink and Katech point out what next if you just change to the 100mm MAF?
ie. what intake , filter?
SS, when you dynoed what was on the free end of the 4" MAF tube? filter?
Intrigued-

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I'm think I'll try a C6 Callaway Honker on my C5. Looking at pics I should be able to use some 4" couplers and modify it to work - we'll see. Hopefully a 100 mm TB will be available soon. Winter project. :D

Chad,

Look at the KPA values over 4700 and see if the readings changed after taking the restriction out. I would be surprises with that kind of gain that the difference is 2-3 KPA!

Howard