Are there results from the halltech mafscreen? I had removed my screen as it seemed a restriction and would crumble and fall apart. I tried back to back testing with a screened maf and descreened maf and didnt notice any fluctuation or change in gas inst miles when taking a couple road trips. The throttle did seem slightly more responsive with the screen under 1/8 throttle pedal but its really hard to tell. I have another ls1 maf with a screen but if you ask me when crunched takes up 1/4 of the maf housing opening. I seen halltech sells these screens for 50$ but not too sure if they work correctly. Halltech Honeycomb™1/8" Cell Laminar Flow Straightener (halltechsystems.com) It says corrects a lean condition only on z06 models im not sure whats different about the z06 intake setups is the maf on the throttle body side of the intake ducting similar to an f-body ls1 or is it the z06 cam with .550 lift that causes the lean condition.

 

I can’t provide any hard data but I did notice a huge improvement in throttle response and the way the car responded and ran. I tried it without the screen first when I installed the killer bee 2 intake and with the screen after. Car felt better with the screen installed. Just my assessment of it.

 

I didnt notice much either but back to back comparison with a descreened maf both stock the 1/8 throttle or felt better throttle response. I can't say much about WOT as the descreened maf may flow better just that the light throttle or simply driving the car felt more responsive and watching the inst miles or current mpg the corvette c5 DIC shows about the same in terms if mileage 26mpg up to speed or 20mpg and part throttle acceleration or 16-12mpg when accelerating at lower speeds i guess city driving.
Thats just what i had felt with the stock screened maf vs the descreened maf. I think maybe a correct wideband dyno tune or speed density would correct the descreend issues.

You use the halltech maf screen? Was it easy to install without damaging and do you think it could easily be removed to install on a different maf sensor if the current one were to fail? What other mods do you have and have you had the car tuned?
Halltech has a killer intake plenum where they use the ls3 ls7 style maf/iat sensor in there round duct without a screen and just told me it needed reclibration and would send me the correct calibration file to upload that would be close to where it needed to be for tuning.
Thats the halltech c5 intake filter, air bridge, screenless maf port on the air bridge but is a bit pricey.
So its safe to say you could run a descreened maf just maybe would need to be recalibrated.

 

My 02 ls1 coupe is basically stock minus the halltech and a canned diablo tune. I was not expecting the screen to make a huge difference since it’s main purpose according to halltech to counter lean codes, but it did. It’s really easy, just pop the old one out and press the new screen in.

 

Whats a canned diablo tune? What all did the diablo tune? I dont get any lean codes im not sure why they recommend it for the z06 only and not regular c5s. Not sure why it would get lean codes they didnt give me that information. Im curious whats difference between the z06 intake filter setup to throttle body vs the regular c5s other then a different or wider intake filter lid opening.

 

The Diablo tune is a performance tune that is installed from a Diablosport hand held tuner. It also allows you to change some tunable parameters in the ECU. It can be used on an LS1 or LS6. It may only work on 2001 and newer ECUs but I'm not sure. I have one that works on my 04 LS1. The 02 and up Z06's had no screen in the MAF. All LS1's had the screen. If you take out the screen the MAF tables have to be updated due to the difference in airflow reported by the MAF at low engine speeds. Z06 airbox is a little different in that the airbox lid had a larger opening vs the LS1 airbox

 

So you can run a descreened maf as the z06 doesnt have one. Im going to have it tuned without a screen i suppose for the cam by probably a mail order and mentioned the descreened maf in the comments. He should have an idea of the correct maf tables. Im waiting to put a wide oval intake filter that i think should flow just as good as the ziptie mod considering the filter surface area.

 

When GM was creating the software for the PCM they had the majority of the software in firmware and several of the inputs tunable. Unfortunately the LS1 firmware included the turbulence from the MAF with a screen into the equations. The LS6 firmware was created without the turbulence of the screen. To get around the de-screening of the MAF requires tweaking of the tunable software to run smoothly. Some LS1 engines parameters are close enough to run without any disturbance to engine management and most requires tweaking with software. Changing cam, air intake, etc usually requires PCM tweaking to get optimal results.

 

Im probably going to go with the stock descreened maf and a tune which should be correct for the descreened maf similar to the z06 design assuming gm went with a descreened maf for a reason on the z06.