evil 5.3

ok i did hit the seach more than once . Is there a plug and play maf for our cars and why does it need to be tune are the tables that far off .

AlabamaGuy

iTrader: (5)

The intake manifold is a bigger restriction than the MAF.

Mels SS

iTrader: (1)

Very true our MAF can handle 500+ hp

evil 5.3

this might be true but you got to work with what you have and i found one in my pile of junk

AlabamaGuy

iTrader: (5)

I don't think you'll see much gain going from 000o000 to 0O0o000. That's just me. However, If I were to go to a bigger MAF and larger intake piping, maybe. But then again my money would probably be better spent on an ls6 intake over the ls1. This is just my opinion, but after you pay for the tune, and building a custom CAI to match the larger MAF housing, you would be well on your way to building your own intake swap or a port job on the stocker.

evil 5.3

well said ab and thank you but why do they need to be tuned when i changed a maf on my 5.3 truck it didn't need to be tune and that one of my hang ups and i want to change the inake but my beater comes first in this case bc i need it to be reliable for the dd position

LS1 Racing

iTrader: (15)

Don't we have an odd-ball 3.25" MAF, or something like that? I know most LS motors have 3.5" and larger. Your truck probably came with one of these larger 3.5" MAFs to begin with, so you most likely would not have needed a tune when swapping one out.

Keep in mind there were plenty of LT1 motors making way over 400 HP on their "little" 3" stock MAFs back in the pre-LS1 days.

So, while you may have a larger MAF available, I doubt there would be much benefit to throwing it on our little motor, like AB said.

JDMC5

iTrader: (3)

this is true.

There is actually quite a big difference between the stock gxp maf and other LS maf's out there. When NMP swapped to a larger maf he noticed a gain in topend power, granted he has an LS6 intake. My opinion is if you have a stock intake then use the stock maf but if you swap to an LS1/2/6 intake then there will be gains realized by the 85mm maf.

You need to retune your maf when swapping to a larger one because it has a different calibration. The computer translates the hertz reading given by the maf into an airflow number and uses that measurement to calculate fueling. Here's an example, at 8000 hz a stock 07 gxp sees 14.416 lbs/min of air. Now at the same hz a stock 07 TBSS sees 15.75 lbs/ min. That means if you swapped to a TBSS maf without retuning your initial tune will be lean because more air will be entering than the computer knows about.

Sadden

Thank you JDMC5.

JDMC5

iTrader: (3)

06MonteSS

yeah... do NOT swap out the MAF for a different or aftermarket one... you will screw things up... there is no need to anyway... the stock GM MAF is good for more hp than the car will ever make anyway, heh...

DavidGXP

iTrader: (14)

Only because of our stock intake manifold. Swap that out and the MAF with the appropriate piping and gains would be huge. The 5.3 trucks have the bigger MAF. We're stuck with the smaller one cause of space limitations.
I wish there was a way to avoid the 90* bend the leads into the TB. It has to be disasterious for airflow.
Just changing the MAF alone isn't worth it.

LS1 Racing

iTrader: (15)

So true. The truck intake is cavernous compared to ours, making the larger MAF a must.

AlabamaGuy

iTrader: (5)

The bend into the maf is only 45* isn't it?

JDMC5

iTrader: (3)

been there done that.

DavidGXP

iTrader: (14)

45* it is ish