racecar

Check the pictures of my new MAF from a 08 Corvette. This is LS3 right?
I am going to put this in a 90mm tube right after my air cleaner.
So which side is up, which edge faces the airflow. One side is all plastic with some slots, the other is all metal with one slot. What direction is this facing on a LS3 Corvette? I hope that it is the small edge into the airflow.
If anyone could post a picture of this on an 08 Corvette, that would show what I need to know. Thanks..

tektrans

iTrader: (23)

It's not gonna sit flush with just a round tube. you shoulda just bought a 100mm maf from tsp or lingenfelter. Check out a site that sells them and see what I mean about the tube, you need a flat area to bolt that to.

Mkelcy

iTrader: (3)

The MAF should be marked for the direction of airflow. Look for a small arrow on top of the mounting flange. For mounting it, try this:
http://www.summitracing.com/parts/SPE-9705/?rtype=10

NastyC6

iTrader: (77)

Do you have the MAF pigtail yet?

Installed Pic:

I have this one for sale if you need it.

dsrour

You can obtain 19166574 - Mass Airflow Sensor (MAF) Mounting Bracket - For Use With 15865791 Sensor which is a weld on bung ~$12. Is asymetric so MAF only fits one way, therefore make sure arrow on MAF pointing in direction of airflow prior to welding.
The MAF should be mounted in a straight section of tube 10 inches or so from TB according to GM. See attached instructions from GMPP.
In any case the MAF will need to be calibrated after install with tuning software and wide band 02 sensor.
I used the adaptor shown in picture.
Available from:
http://www.powrmax.com/PowrMAF%20100.html

Schwanke Engines

iTrader: (1)

I have Plug and Play MAF pigtails in stock for $33.00.

Elderado

iTrader: (1)

Would this be an upgrade from my 85mm maf? What are the benefits?

Schwanke Engines

iTrader: (1)

There maybe a 5~10hp gain, but like it was said before, you will need to have the proper calibration in for the new sensor.

69LT1Bird

iTrader: (1)

With a 90mm tube, 90mm TB I doubt there will be any measurable gain over a 85mm style.

Put all 100+mm stuff on it, intake, TB, tube, filter, then you may realize a gain.

The resolution of the 99 PCM is not the best for that MAF either.

hymey

Throw it away and go SD and OTR

racecar

Thanks everyone. I have a SD tune now and it works great, but I need to pass DMV to get license plates, and with SD tuning there is a code for MAF failure and no way to turn that off. Will the car run better in all weather conditions with a MAF?? I hope it will.
I have a 4" tube from the air cleaner to the TB and I don't want to restrict it with a 85 maf. I am going to dyno as soon as I get the MAF connected and tuned, I don't want to loose any power. I want it all, good tune in any weather condition, pass DMV, don't loose and HP. Is that possible.

Schwanke Engines

iTrader: (1)

You should be able to turn the code off? But if you can't, I have a kit put together that has the 4" tube, maf sensor, harness and two silicone connectors for $219.00. I will take $50 off since you have the sensor.

You won't loose any power with the 100mm, and it will be good in any weather.

Let me know if you are interested.

racecar

Thanks for the MAF offer Mark. I have a 89mm ID tube that I am going to try. My theory is that 85 is too small, and 100 is too big. I want to keep the diameter small enough to keep the velocity up, without restriction, that's why I chose 89mm. This is where I am going to start tuning from. The challenge is; how hard is it to tune the MAF, and then what are the dyno numbers.

VortechC5

iTrader: (6)

I run the new style MAF on my 02 C5. I have the correct MAF table and can post it if it would be useful.

dsrour

With the card style MAFs that are only sampling a portion of the air mass, anytime changes are made to the intake tubing,larger, bends, etc, the calibration will be off. Most MAFs employ a wire in the airflow. As air moves over wire it cools and the MAF applies current to maintain the baselinetemperature.The amount of current utilized is proportional to the airflow.
This is converted into a signal for the pcm and determines the fueling of the engine. At the factory they use a flow bench and know actual airflow and can plot air flow vs MAF output.
Since most of us don't have flow benches another means of determining airflow is necessary. This can be done with a wide band 02 sensor. You first diable the other adaptive fuel measures such as LTFTs, closed loop,
You then look at the difference between the commanded AFR and the measured AFR. If you' re lean you know the MAF is telling the there is less air than actually is present and vice versa. You have to do this a multiple rpm points as the the MAF signal is non linear.

racecar

That is pretty much how I tuned the VE. Yes there are scientific methods with pids and recording then add subtract multiply. I just drive, scan, the play it back and look for trends of AFR at rpm vs map. Then go to the VE table and make changes. It has worked for me, I get a little better each day. My VE is really good now, the car runs great, so MAF tuning should be a similar learning curve.

rskrause

Sorry to resurrect an old thread but can you post the table? Or email it to me at rstevenkrause@gmail.com?

Thanks.

69LT1Bird

iTrader: (1)

Try here.

http://www.powrmax.com/PowrMAF100%20Tables.html

VortechC5

iTrader: (6)

This is what mine looks like after doing auto MAF tuning using EFILive.

LABELS MAF Sensor Calibration (Grams/Second)
Hz {link: GM.MAFFREQ} Value
1500 3.929688
1625 4.429688
1750 4.992188
1875 5.648438
2000 6.398438
2125 7.109375
2250 8.062500
2375 9.062500
2500 10.250000
2625 11.757813
2750 13.640625
2875 15.382813
3000 17.218750
3125 19.093750
3250 21.164063
3375 23.320313
3500 25.726563
3625 28.179688
3750 31.046875
3875 33.945313
4000 36.750000
4125 40.132813
4250 44.882813
4375 48.109375
4500 51.671875
4625 54.078125
4750 59.046875
4875 64.781250
5000 69.125000
5125 75.585938
5250 80.187500
5375 85.296875
5500 93.273438
5625 98.335938
5750 105.031250
5875 112.046875
6000 121.578125
6125 125.773438
6250 133.125000
6375 142.093750
6500 148.859375
6625 155.023438
6750 163.804688
6875 175.328125
7000 182.687500
7125 186.000000
7250 186.968750
7375 196.406250
7500 207.304688
7625 222.273438
7750 233.937500
7875 247.000000
8000 253.750000
8125 262.828125
8250 278.703125
8375 292.039063
8500 303.367188
8625 313.539063
8750 325.781250
8875 340.328125
9000 354.882813
9125 369.828125
9250 385.210938
9375 401.007813
9500 417.242188
9625 433.898438
9750 451.000000
9875 468.539063
10000 486.539063
10125 490.000000
10250 494.273438
10375 497.750000
10500 501.226563
10625 511.992188
10750 511.992188
10875 511.992188
11000 511.992188
11125 511.992188
11250 511.992188
11375 511.992188
11500 511.992188
11625 511.992188
11750 511.992188
11875 511.992188
12000 511.992188

futureuser

iTrader: (1)

Thanks for the post. I ordered these and here are pictures: