Got an LS1 MAF, need tables...

[turbokinetic]

Just a quick question. I just got an LS1 MAF (25179711) and I want to expiriment with it.

I know this MAF is popular here and hopefully someone can post a MAF Frequency Vs. Airflow table for this unit.

I beleive it maxes out at 10,000 HZ at about 800 Gm/Sec airflow.

I am going to use a frequency divider to bring it down to the range where the ECM can count it. It would be great if I had a starting point for tuning.

If someone has a factory LS1 tune they could copy and paste the MAF tables I would be greatful.

This is my first time attempthing a MAF tune (have done several speed-density setups).

Many thanks in advance!

David

 

[TurboDave]

You trying to re-invent the wheel???? The Translator series already does this. And quite well I might add.
Trying to cut into someone elses invention (intillectual property) isn't going to get you very far.

 

[turbokinetic]

You trying to re-invent the wheel???? The Translator series already does this. And quite well I might add.
Trying to cut into someone elses invention (intillectual property) isn't going to get you very far.

I'm looking for the stock MAF tables, that came in all LS1 ECM's. This is not even going on a turbo Regal.

I will overlook your blatantly arrogant reply and assume you didn't reallt understand what I was looking for.

 

[turbokinetic]

OK got a stock MAF table from a 2000 Camaro. This should be close enough for me to get the car running and wideband tune it.

If anyone needs it in the future, this is the table. Bear in mind the shape of the intake tract and turbulence before the MAF make a large effect on the MAF tables.

Hz gm/sec
1500 2.320
1625 2.695
1750 3.148
1875 3.648
2000 4.164
2125 4.727
2250 5.359
2375 6.055
2500 6.805
2625 7.641
2750 8.531
2875 9.469
3000 10.430
3125 11.445
3250 12.563
3375 13.781
3500 15.086
3625 16.492
3750 17.984
3875 19.578
4000 21.258
4125 23.031
4250 24.906
4375 26.883
4500 28.953
4625 31.133
4750 33.398
4875 35.781
5000 38.281
5125 40.930
5250 43.727
5375 46.688
5500 49.797
5625 53.070
5750 56.508
5875 60.109
6000 63.875
6125 67.805
6250 71.898
6375 76.156
6500 80.578
6625 85.156
6750 89.906
6875 94.828
7000 99.930
7125 105.195
7250 110.648
7375 116.281
7500 122.117
7625 128.148
7750 134.383
7875 140.867
8000 147.586
8125 154.531
8250 161.719
8375 169.148
8500 176.820
8625 184.734
8750 192.820
8875 201.148
9000 209.742
9125 218.609
9250 227.773
9375 237.258
9500 247.078
9625 257.273
9750 267.859
9875 278.875
10000 290.344
10125 302.313
10250 314.813
10375 327.883
10500 341.563
10625 355.906
10750 370.953
10875 386.758
11000 403.359
11125 420.828
11250 439.203
11375 439.203
11500 439.203
11625 439.203
11750 439.203
11875 439.203
12000 439.203

 

[TurboBob]

if you hunt around you will find the stock MAF tables.

What I found when I was developing the translators is that a straight frequency division will not fit the LS1 flow range into the stock frequency range.

But good luck with your experiments. A desire to experiment and learn is a good thing.

Bob

 

[turbokinetic]

Just looked at your translator page. That's a very nice piece of hardware. What I'm doing is nothing like that. I'm using a "dumb" piece of industrial electronics hardware (which I have already) to adapt a used MAF to my project car. Really it doesn't translate anything. Therefore I needed the factory table for this MAF and will have to put the numbers in the ECM its self, just like you would do to change to any other larger MAF.

My engine will never need the whole range of this MAF, so if I can't fit the whole range of the sensor in the capability of the stock ECM, it should be OK. This whole project has been use of junk parts to build something.

Thanks,

David

 

[turbokinetic]

....But good luck with your experiments. A desire to experiment and learn is a good thing.

Bob

Thanks, I love to learn and expiriment. It does indeed make me a very well respected technician at work, too.

Later,
David

 

[TurboBob]

the only thing thats close is divide-by-58.

your ECM will run out of range at 8300 hz on the LS1 MAF. Which limits you to less flow than the stocker.

The stock tables are published. The ECM has multiple tables with table multipliers. The ECM can't handle anything over 144hz. Even though the tables go higher. The lowest the ECM can read is 34 hz.

Bob

 

[TurboDave]

I'm looking for the stock MAF tables, that came in all LS1 ECM's. This is not even going on a turbo Regal.

I will overlook your blatantly arrogant reply and assume you didn't reallt understand what I was looking for.

A bit more info in your original post could have saved a lot of confusion.

 

[turbokinetic]

A bit more info in your original post could have saved a lot of confusion.

Yes, I realize that now. Before your reply I didn't actually know what a translator was. I had heard the name, but I thought there was only one translator, and it was a speed-density conversion.

I had asked on another board about the stock MAF tables, and was told that "the TR guys use that MAF often" so I asked here.

As I said - no offense taken; I realize it was a misunderstanding.

David

 

[turbokinetic]

the only thing thats close is divide-by-58.

your ECM will run out of range at 8300 hz on the LS1 MAF. Which limits you to less flow than the stocker.

The stock tables are published. The ECM has multiple tables with table multipliers. The ECM can't handle anything over 144hz. Even though the tables go higher. The lowest the ECM can read is 34 hz.

Bob

Bob - thanks for the insight. This is going on a FWD 3.8 with a 7783 ECM. The stock MAF produces only about a 12 Hz signal at idle, with indicated 5 Gm/Sec airflow. Apparently some of the parameters are different in the 7783 compared to the 7148, as to the minimum Hz it can interpret.

Thanks again! Later,
David