F-Body Europe

Rich. Everything I have read says that it will make you run leaner. By porting the stock MAF you are allowing more air into your engine, but the MAF is calibrated for the original size so it doesn't know more air is being allowed into the engine. More air and the same amount of fuel means you will run leaner. With N/A you want to run a little lean because that equals more power. With boost you want to run a little rich because that equals safe and if done right more power. Am I looking at this wrong?

i can't believe you haven't put the shifter in yet!!!

Just a couple things wrong with that. 1. The MAF still knows how much air is going thru, your just allowing more air thru a opening than what the MAF was programed for. 2. The real debatable part is what happens in 200 or so miles when your car catches on. Thru monitoring of O2's and your L/R BL does it(PCM) just "adjust" to the phantom increase of air or not???

As far as air/fuel, yes your right. Ideally you want to achieve a stoich ratio (14.7:1) and leaner makes more power in both NA or boosted situations, its just that a lean condition can be traced back to just about any mechanical fatality. But to rich will cause just as serious problems over time.

My point is, no two LT1's accept the ported MAF the same way. That may be the best thing since sliced bread to yours, but it really F$cked my car up.

Peace
Rob

That's the same in the LS1's. No 2 LS1's react the same. There are LS1's out there that get major pinging from ported/MAF ends and some don't. I have the Aftermarket ported MAF ends and have cut the electronics bracket and have had absultly no problems that I know of. Hopefully when I get my A/F guage in, I will know more what is going on.

Does anyone have that throttle body air foil for LT1 throttle bodies? Does it really work? They seem to sell a lot of simple little things for these cars and claim 5-10 HP for everything. It just seems to good to be true. Is this the domestics version of rice sticker?

I have a knock module and air intake temp sensor module and an air foil and I ported the MAF, My car had 305 HP stock at 10HP per mod I must have 345HP now. Man this kicks *ss. Just a little humor, not meant to offend anyone, but I'm sure it will. Hell, I plan on doing the Knock module and MAF myself. :p

I think it is ok, but do not know about the claimed gains. The tornado is the shi t though......

Tornado, the intake supercharger thing. That is sweet. I want one too:)

I just cant help myself.

Airfoil, Yup, I have one, and its worthless in the power production business.

The hp adding only works in Type R dyno sheets.

as far as the Type R style of adding hp, nope, I'm hoping to have 350-375rwhp, and there is a big differance between the 2 cars.

Peace
Rob

Okay, let me explain my opinion better.
Let's say the stock MAF is a 50mm. It is calibrated from the factory to know that when "x" amount of air flow is going through it then it should add "x" amount of fuel.
Now you take the stock MAF and gut the inside out. It is still 50mm in diameter, but it can now flow more air through the same opening because the actual inside area is larger (doesn't have all of the bracing taking up space).
So now the MAF is still reading the same flow rate as stock, but it is actually flowing more air than it did stock.
I still don't think I have made this clear enough. The MAF senses how much air goes through it, but is calibrated for a certain size. When you change the inner diameter of the MAF you allow more air to go through the MAF, but you do not change the calibration that it was set at. Since the MAF does not actually measure the total amount of air traveling through itself(it only takes a sample of the air flowing through it and this is what the calibration is for), it does not know that it is flowing more air than it was calibrated for. This is why the car will run lean after you port the MAF. It is true that the o2 sensors will see this and try to correct it. This may be were the engine trouble codes come from. The MAF and o2 sensors are having conflicting signals.
I know what I am trying to say, but I'm not doing very well at putting it into words. Peace

Our MAF doesnt have a sample tube, the hot and cold wire run the width of the maf, so since more air is coming thru now, it is dropping the hot wires temp more than normal, and is requiring more volts to keep it at the 200deg ambiant temp. Which in theory will cause the PCM to fatten up the fuel ratio.
Even if it doesnt, the PCM will eventually catch on and unlearn what you have done.

Now back to reality, Like I said before, your car may like it, I know mine didnt. The thing you should be concerned with is your PCM is not close to as forgiving as mine. With OBDII you could get all kinds of out of tolerance things going on.

Back when this was the mod of the month, everyone, including my dumb ass did it. Not very many people do anymore (wonder why). If your goal is to lean the car out to make more power, I would do it the right way and have a Ed Wright or MGF program installed which will give you better spark advance, cooler fan temps, better air/fuel tables.

In the end, your gonna do what you want (and should), but you did ask what mods people did and what did or didnt work.
For me: Hypertech programmer, airfoil, ported MAF all were either a waste or harmful.

Sorry everyone for my long winded self, I'm done with this now.

Cya
Rob

Krazy as rob said it really depends on your car they are all the same but different. My car may take to a mod better than yours or vice versa. In my opinion porting the Maf is the biggest waist of time. Here is my logic behind this.

1. If you port out you maf and it works then great!
2. If you port out your maf to gain 1 maybe 2 Hp you may have just waisted $300.00 which you could have used for a better mod like headers, 4:10's These will give you noticable power. Key word Noticable, When you do the maf you'll spend more time worrying if you gained or you lost.

There are many free mods that you can do to get those xtra ponnies. I know this because i'm pretty sure I've got them all. You could do the throttle body coolant bypass 1-2hp. You can improve the bad design SLP did on the SS induction kit (no offence to anyone they should have did them the way they did the TA's). You can take the air pump off and throw it in the garbage and plug you exaust manifolds. This is just my .2cents but like every other f-body owner do what you want to do because it's your car and your probably going to do it anyways. Good luck if you have any questions feel free to ask.

I'm not dibating if the MAF porting works or not, I am disagreeing that porting the MAF will make your car run rich. The fact remains that the MAF is calibrated from the factory for the amount of air that it can flow. When you port the MAF it flows more air and the MAF is still calibrated for the original size, so it has no idea that more air is making it through. It is just reading the temp drop like normal and sending the signal to the computer so it can adjust how much fuel to dump in. It has not been recalibrated for the larger size so it does not change the reference voltage that it sends the computer for any temp drop that it reads. It just sits there acting like the stock MAF and doing it's thing. This is why porting the MAF will lean out your car. Peace

Sorry Rob but I will have to disagree with you. I have recently done the MAF porting.... and my car now runs much leaner. I use to have the puff of black smoke when getting on it.. but since I have ported the MAF I no longer have this little problem. And I don't know about the rest of you but I saw a pretty decent gain in HP when I did it I can now chirp my tires in third gear with an A4 tranny! That I believe is a decent gain! Later!

No prob Jr, your just proving my point.

Nobody nows how your car will act after you do this. Since your car liked it, you got a bonus, better running for no $$$. Mine hated it, so I had to spend $$$ to fix something I screwed up.

People can tell me all day long what is supposed to happen, but until you do it, you dont know.

I did like the choppy idle, kinda like a poor boy cam .

Krazy this is really what it comes down to. If you want to do it than go ahead. If it doesn't work then you just waisted 300.00 when you could have spent it on somthing to gain a bigger difference than just 1-2 hp. It's you car so I would honestly tell you to do what you feel is right.

A set of stock unported MAF ends can be had for about $75. LS1 and LT1 MAFS are the same, so either ends can be used. Everyone here is talking about what it does or should do, but how are you checking this? Smoke out of your exhaust is not a real check. Get a gauge or a wide-band O2 reader and then try some ported, unported ends and see how it really works.

Damn the Maf dropped in price that much? This is on a serious note.

Sure they have.. I do not know how much they are from GM, but they are always for sale used when people upgrade...

Thats the ends. The actual sensor is still triple digits.

I should have known george was pulling some E-bay prices lol I didn't think they dropped in price that much. It's pretty bad when a MAF cost more than the OPTI. Gm sure does have a way of jacking up the prices on the small stuff.