In a few months or so I'll probably be switching from the 85MM MAF to a LS3 MAF card in a 4" tube. This is on my 427 LS3.

 

Imagine this comparison- IF your engine needs the flow that a only 4" tube can deliver(and maybe it doesn't), don't you think an 85mm (3.35") MAF is going to restrict that flow? There should be no argument about that. The math proves it. The tuner who said a bigger MAF would do no good is full of crap, TBT.

 

Pic to visualize the choke point.

 

 

No I completely understand that, it's basic math. Does my engine required that much flow of a 4" tube unrestricted? Idk, but I guess it's better to to take it on the safer side and move it up to a true unrestricted set up as for future mods anyways.

 

You DO raise a good question. IF after you put in the larger MAF it does not make more power, that would tell me it was getting enough air beforehand. That said, those who KNOW seem to think it should make more power with a larger MAF, and they have enough experience in this stuff to back it up.
LaBLKv6Z above has a pretty potent package and I think he WILL pick up more power with a larger MAF. I feel you should too, but my crystal ball is fogging up right now, so I don't know for sure. lol

 

 

You mean going to a 3 foot MAF won't gain all the powerz????

Maybe on a max effort setup it's worth it, but on most setup's stepping it's not going to be worth much if anything.....and that also assumes its tuned with each MAF so the results aren't skewed by the fact that when people descreen a MAF or go to a larger MAF and don't retune they typically run leaner which makes more power.

 

LaBLKv6Z should def pick up more power with the larger 427. Mines is truly only 363, but then I do have some nice heads slapped on there. I think there's too many variables to truly just assume I will gain power or vice versa.

But me as being me, lol. I am most likely just going to go with a SD tune. I figure the cost to upgrade to a larger MAF, will cost about $250. Or, I can make my own for $100. That being said, it will cost about that much extra to go SD. Give or take of course, so prob about $250 extra for SD. That to me is worth a bit of peace of mind and not wondering if I'm not squeezing any extra power out of my set up and I just cannot live with that lol

 

Since you are getting a retune with the larger MAF, it would be great for everyone on the board if you can do one dyno pull before swapping MAFs. Then obviously post your results with the larger MAF.

Even though you are running a 427, it will still be nice to some true, same day comparisons.

 

I do plan to dyno a before and after but sadly it won't be the same day. It will be the same dyno though. I'm working with Pat G on tuning this setup and things are kind of slow between revised tunes.

 

I say post them either way, if you can. Won't truly be a back to back comparison but good to see either way

 

Will do, I been posting everything along the way in my build thread.

Highlighted is my MAF data at WOT.

 

I believe it will make some more power. Around 10 just guessing. You do have a 427. In 4 results.

 

Go talk to dave over at Efx_tuning. Great guy over there. didtch that Maf and run a speed density tune..

 

 

I just had to comment on this old thread. I had a 2001 camaro m6 5.7 LS1 with prc heads, ms4 cam, fast 92 intake and tb with 85 mm maf and slp lid. Did 2 pulls on the dyno and made 426 rwhp both pulls. We pulled the maf went speed density and made 443 rwhp.

 

Agreed

 

Update. A little late but nonetheless. Car made 440whp, 412tq on a dynoyet.

I was hoping to get a little more out of it. I did tune on the maf and with just 36” turn downs for the exhaust.

I think I’m going to try and re tune.

what do y’all think. True dual intakes? Get rid of the maf?

will running a full exhaust with mufflers help with back pressure?

 

Could you post the graph? Please ask the tuner for the KPA reading at idle and peak whp. That info maybe helpful.

What sort of rear end, gear & tire?

Sometimes those eat a lot of whp.

I don't think a full exhaust with mufflers and more back pressure will help much. Open cuts off the headers was worth 20whp on my 383 LS1 with a small cam.