Do MAF Ends net any gains?
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From: Alabama - The 'Ham
Do MAF Ends net any gains? I searched through the archives and found that porting the stock MAF is not recommended unless tuning accompanies the process. But what about after market MAF ends? I just bought a rock stock 98 Formula (screen in place, crush bent exhaust, skip shift present, etc.) with 42k miles. I have been offered a set of MAF ends so you can't beat the price. What would be the effect of installing these? I realize with no mods, I would see little gain but I'm thinking ahead. Is there any condition under which these would be a worthwhile mod?
Originally Posted by BigE
I searched through the archives and found that porting the stock MAF is not recommended unless tuning accompanies the process. But what about after market MAF ends? I just bought a rock stock 98 Formula (screen in place, crush bent exhaust, skip shift present, etc.) with 42k miles. I have been offered a set of MAF ends so you can't beat the price. What would be the effect of installing these? I realize with no mods, I would see little gain but I'm thinking ahead. Is there any condition under which these would be a worthwhile mod?
Only if you tune your car to have them will they work. As posted before, tuning your car with them is difficult too. If you do get everything to work out expect around 4-5rwhp on the dyno. Its been done on a Z28 that I know of.
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I don't really understand what the big deal is. Porting the MAF doesn't screw your readings up any worse than a lid does. Of course together, the problem is twice as bad.
Last edited by Another_User; Jan 13, 2005 at 06:51 PM.
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A_U......I don't know anyone who has had issues with their car running poorly after installing a lid....but plenty of people have issues with altered MAF's. Whether it be ported ends, aftermarket ends, aftermarket MAF.....90% of the time it seems to cause problems. sometimes stuff like this just is. ported MAF ends on an M6 isn't as big of a deal as it is on an A4 from what I understand, fwiw.
i have high flow ends on my car. i wouldn't port the mass air so i got ends from thunderracing and they were one of my first mods.i went from 13.10 to 12.95 with no other mods,some people say they are no good but they have been great for me.my car is a m6 the ends were on running 13's and still on in the 10's 
My car also runs 1/4 sec faster with MAF ends. They do flow more air (5% on my car) so they can cause lean & KR issues. But they made a noticeable gain on my car, unlike the lid & K&N filter, or underdrive pulleys, or smooth bellows, or.....
IMO it's the aftermarket MAF electronics that cause the real issues. I re-installed my stocker with the GMAF ends.
IMO it's the aftermarket MAF electronics that cause the real issues. I re-installed my stocker with the GMAF ends.
Ported MAF ends work alright if you scale the entire MAF table between 15-20 percent. That is about the average from what I have seen and some are even more than that. In general though, ported MAF ends cause nothing but problems.
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Okay, so it seems the consensus is that MAF ends are not good for a bolt-on car, but if you can tune, they can net a minor gain. I may try this but only under the supervision of HPTuners or some other tuning/diagnostic tools.
I feel a very noticeable gain with my severely hogged out MAF. Im one of the few proponents of porting the MAF. However I have a stock one for reference, and HPTuners. I used to use a MAFT, which worked out well. Also, for the budget minded, you can always solder in a 1/2 watt resistor between the two bars on the one side of the maf. This was enough to ballpark my MAF back into place. I used a 1K resistor on a pretty severe port job. You might use a 2k resistor on just ends. Now my MAF table is scaled by 145% in HPTuners.
I ran ported MAF ends on my car for ~48K miles, while it was stock internals. My car like many 2001's need more timing, the ends "tricked" the PCM into adding more.
When I went with the H/C my tuner asked me to switch back to stock ends becuase they were easier to tune for.
So, I went 11.54 with Whisper Ported MAF Ends, stock internals and 10.77 with the stock descreened MAF ends with the H/C setup.
When I went with the H/C my tuner asked me to switch back to stock ends becuase they were easier to tune for.
So, I went 11.54 with Whisper Ported MAF Ends, stock internals and 10.77 with the stock descreened MAF ends with the H/C setup.
