Intermittently my 96 is throwing P0100, MAF activity insuffiecient, something like that. So I took it out to look it over and holy crap there was a ton of junk stuck to the screen. I should have taken a pic, sorry.

Someone before me had to of run this for a while with no air cleaner. Plus the bellows that attaches to the throttle body wasn't intalled correctly. The bottom of it was folded in front of the throttle body intake and clamped that way. I wonder how much this was killing performance.

I decided to just descreen the thing, it only involved disassembling it, removing a big circlip and the screen just fell right out. It was real nasty looking and crud started falling out of it.

I know, a new air cleaner is next on the list.

So just a friendly reminder to perform some basic looking over every now and again.

 

I d d did the same with my maf.

 

If you de-screen a 94 - 96 MAF you'll only screw things up further. It's not a screen it's a straightening vane designed to smooth the airflow and create a more laminar flow across the MAF wires/diodes. Previous owner probably just ran one of the after market oiled cotton gauze air filters that didn't seal well to the air cleaner base and had gaps to allow debris in. Not counting the debris that gets past the pin head sized holes in the cotton gauze media of just about every cotton gauze based filter out there. Hold one up to a light source sometime

 

Put screen back immediately.

If it was not for that screen BTW you'd be buying a new MAF.

 

Oh my God what am I gonna do!!! The world is going to end, my screen is gone.

You know what I think about it straightening flow....HORSEPUCKY! By the time the air goes through the filter and through the bellows a little honeycomb POS screen isn't going to make a bit of difference to where or how the air is directed. The screen is nothing more than a final defense for the sensors.

With religious air filter replacement I don't foresee any problems. If I do I'll change it back to a stock piece.

 

I removed the screens about 5 years ago and have had no problems. Have not found any debris on it with my cotton gauze media filters either.

 

where is this screen?

 

GM powertrain engineers believed otherwise. Descreening a '94 - '96 ('92, '93 were Speed Density and had no MAF's) will throw off the calibration between the PCM and the MAF. Ask any knowledgeable tuner.

If all it was was a "final defense" it would not have the depth and thickness, i.e., the unique shape.

There is absolutely no benefit to removing the screen on a '94 - '96. And it is not recommended.

Clearly, you do not understand the dynamics of the incoming air charge. It is still retains some residual turbulence when it reaches the MAF.

But to each his own.

 

I think as an engineer, I understand the dynamics quite well.

 

I'd be interested in before/after HP/Torque gains. Probably right up there with the TB bypass.

 

I wasn't looking for any horsepower gains. My personal preference is to have it gone.

 

All I have noticed is the voltage spikes are thrown higher and it causes a little stumble at times, but you have to know what to feel for to notice a problem.
I use the tts and ibm computer to see what it will do. I think I gained 5000 hp and lost 10,000 hp by removing the screen.
I run nitrous, don't need the screen.
It's just a bug catcher.
Or we can go the gulf ball theroy.Gulf ball goes farther with dents and not as far when all round.
C&C ported heads flow better than polished heads.
I have both ,no seat of the pants diff I can feel.

 

 

I've only heard of guys losing about 1/10th of a second in the 1/4 mile from removing LT1/LT4 screens, never heard of any gains.

L98's are different.

 

I'd be interested if you smart guys have any first hand experience with anything or just spew regurgitated hearsay as gospel.

 

My LT1 is speed density .. But my LS1 is MAF


With a K&N filter, catback, and TB bypass and tune the car went 13.07.. THe next week we went out and the car did a 12.74 first pass with nothing different except for pulling the screen.

Now, do i think the car picked up 3 tenths from pulling the screen? no. I do think it picked up some.

I thought I owuld have to go over the tune again from pulling the screen but it didn't really change anything on that car from what the wide band said.



We now have a differnet LS1 car.. A 00 instead of a 01 (18 wheeler ran over the 01 this pass january) I'm getting a LS6 intake for it this friday and after that I plan on going to the dyno again with this car (I dyno tune it all the time) anyway..

This time I plan on pulling the screen after a few runs to see what happens to both HP and AFR. It should be a nice subjective comparison.

BTW.. this is why none of my cars ever get anywhere.. I have too many projects! A mustang, a LT1 and a LS1. The LT1 has had a clutch waiting on it since march or so.

 

Thats one thing I absoulutely hate about the internet. I wish people would speak from experience instead of what they've read on the internet.

 

Read some of the C5 forums, they're pulling their screens all the time with no ill effects. I don't notice any difference at all. like I said before it's a personal decision I'm making to keep the air path unobstructed. You can either do it or not I don't care. I'm not touting any performance gains to anyone so lecture someone else that says there's huge gains to be made. Got it, get it, good!

 

On this forum, actually. So I guess you'll have to take it at face value of the caliber of members here.

 

You've got quite the attitude. And LS1 and LT1 are apples and oranges.

I've followed the age old screen or de-screen debate that crops up in this forum (C4 Tech) on a regular basis for three years, and the over whelming experience has been that de-screening an LT1 or LT4 screws with the calibration between the unit and the PCM.

And if you're going to slam me as a hearsay quoting, fly by night know-it-all, ALLT4, maybe you should do a post search on member name and check my contributions to this forum over the past three years before making your snide remarks. I've had my '95 for over three years and have learned much, firsthand, from wrenching on it, scanning it with Datamaster via my AKMcable and laptop, and adjusting my own PCM parameters via the same cable and laptop with Tunercat software, only being motivated to begin doing so (Tunercat) after I didn't get what I paid for because a certain tuner sent bin for a 3.07 A4 car w/ fans on @ 185 when I specified car was a 2.59 A4 car and wanted fans on @ 194 to 200 range, and who was also very slow to answer correspondence after a prompt paypal payment had been sent. Do you even have a scanner for your car yet? How about a tuning program?

Anyhow, I'm not going to sit here and defend my rep. Members can vouch for my attempts to help and advise members over the years here and the quality of help and advise.

I'm done with this train wreck.