I did a search but couldn't find a definitive answer. Is it a good idea to port (remove the metal divider) the MAF sensor on a LS1 or not? I know how to port the MAF, just don't know if I should.

 

Do not port, especially since you've got an A4. Can mess up your tranny as it will cause your shifts to soften up and increase slippage.
At most just descreen.

 

Do not do it I did it on my 94 and now I am lookin for a stock MAF!>Jake

 

It's a huge debate, I ported my A4 and have been happy with it.

 

The reason I wouldnt do it is because the MAF uses the air flow calculations based on the inside diameter of the MAF. When you port it, it doesnt correct for a size change, so it can throw off the ratio.

 

I have a ported and descreened MAF. No probs at all. I'm waiting for a dyno day to try it vs a stock one and see about gains, but it sure feels a little more torquey.

 

I installed "ported" MAF ends on my 2001 Z28 A4, however it was 2 days before I had the car dyno tuned, my vehicle did run ok for the 2 days before I got it tuned. If you have an automatic, I would not do it unless you are going to have it tuned, for the PCM DOES use the MAF + speedometer readings to shift the automatic transmission.

A side note, the Corvette MAF I believe is descreened from the factory.

JMHO

SteveC

 

If you're gonna port your MAF, do what I did. I found a guy who installed aftermarket MAF ends and I bought his stock ends dirt cheap.

Now, I've got one set that I've ported, and a stock set complete with screen.

 

Well, for now I will just keep it descreened.

One more question, is the Corvette's meter tuned for the non-screened sensor?

 

the corvette unit, typically sold as the ZO6 maf, is larger, has no screen and is calibrated specifically for it's dimensions.

had one on my 96 and noticed a decent top end gain

 

Only Free mod I didnt do. Too many problems. Certainly dont want to go too lean, and with the IAT mod with the most agressive Fuel/Air mixture the car can do, I dont need the knocking or the worry...

 

The biggest problem is fixing the MAF values in the PCM. Until there's a good method to flow testing the MAF's to correct the table, I wouldn't use anything aftermarket. If you buy a Z06 MAF, just load the Z06 MAF table into your table. It'll have more cells since it goes to a higher frequency.

The ported MAF ends have been reported to cause damage to A4's as a result of the PCM thinking there's less load on the engine - because it's not accurately reporting airflow through the MAF.

Or, switch to speed density

 

Don't touch it.

If you must, I will trade you a set of stock ported ends AND a set of aftermarket plastic ends for stock ends with a screen. PM me if interested.

 

Don't do it. See article in current Chevy High Performance on same.