Understanding MAF Table Calculator?

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Understanding MAF Table Calculator?

Postby L67PSI » Sun Sep 10, 2017 11:11 pm

Hi all,

I've almost reached the limit of the stock MAF hz on my VT L67 using the Enhanced Code. With 3.4" pulley & 1.9:1 rockers I'm seeing 9937hz @ 5500 rpm and Cylair of 843.

I'm wanting to swap to a LS2 Delphi MAF (I already have adapter harness) so I can continue with W2A intercooler and smaller pulley.

What I need help with is the MAF Table Calc - https://www.pcmhacking.net/forums/download/file.php?id=6851

Where do I start? Can someone point me in the right direction?

Thank you

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Re: Understanding MAF Table Calculator?

Postby antus » Mon Sep 11, 2017 9:17 am

Stock maf with enhanced and a genuine maf should go above 10khz - closer to 15khz. I can have a look at the spreadsheet when im on a pc later but someone else might be able to help in the meantime or might have a table that suits an ls2 maf to use as a starting point.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: Understanding MAF Table Calculator?

Postby Dylan » Mon Sep 11, 2017 11:52 am

I posted the data for a MAF from a VZ LS1 in immortality's thread a while ago. I'm pretty sure they're the same 5 wire 90mm.

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Re: Understanding MAF Table Calculator?

Postby immortality » Mon Sep 11, 2017 11:55 am

Stock MAF is good for 10082hz I believe although mine is reading 10200hz but I've reduced my red line until I fit my new valve spring and the MAF mentioned above.

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Re: Understanding MAF Table Calculator?

Postby L67PSI » Mon Sep 11, 2017 1:42 pm

Dylan wrote:I posted the data for a MAF from a VZ LS1 in immortality's thread a while ago. I'm pretty sure they're the same 5 wire 90mm.


Yes it's a 5 wire 90mm MAF. Delphi #25168491. I thought this came from the VZ HSV range with the LS2 6.0L.

I had a look through immortality's post, was this the data you posted? https://pcmhacking.net/forums/viewtopic.php?f=13&t=5096&hilit=VZ+LS1+maf&start=240#p77013+

by Dylan » Wed Mar 22, 2017 6:46 pm
1500hz 1.570313 g/s
1625hz 1.851563 g/s
1750 2.171875
1875 2.554688
2000 2.976563
2125 3.445313
2250 3.945313
2375 4.484375
2500 5.070313
2625 5.726563
2750 6.429688
2875 7.195313
3000 8.023438
3125 8.906250
3250 9.835938
3375 10.835938
3500 11.898438
3625 13.046875
3750 14.273438
3875 15.585938
4000 16.992188
4125 18.523438
4250 20.140625
4375 21.859375
4500 23.664063
4625 25.570313
4750 27.578125
4875 29.710938
5000 31.929688
5125 34.257813
5250 36.687500
5375 39.250000
5500 41.960938
5625 44.867188
5750 47.914063
5825 51.117188
6000 54.414063
6125 57.953125
6250 61.593750
6375 65.382813
6500 69.375000
6625 73.476563
6750 77.781250
6875 82.242188
7000 86.812500
7125 91.664063
7250 96.625000
7375 101.765625
7500 107.156250
7625 112.671875
7750 118.429688
7875 124.382813
8000 130.460938
8125 136.843750
8250 143.343750
8375 150.015625
8500 156.953125
8625 164.023438
8750 171.375000
8875 178.945313
9000 186.664063
9125 194.804688
9250 203.101563
9375 211.656250
9500 220.539063
9625 229.601563
9750 239.015625
9825 248.679688
10000 258.515625
10125 268.773438
10250 279.234375
10375 289.984375
10500 301.156250
10625 312.546875
10750 324.398438
10825 336.617188
11000 349.078125
11125 362.218750
11250 375.656250
11375 389.523438
11500 404.039063
11625 418.890625
11750 434.437500
11825 450.554688
12000 467.046875

Thanks

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Re: Understanding MAF Table Calculator?

Postby L67PSI » Mon Sep 11, 2017 1:59 pm

This is the MAF being installed.
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LS2_MAF.JPG
LS2_MAF.JPG (153.32 KiB) Viewed 2441 times

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Re: Understanding MAF Table Calculator?

Postby The1 » Mon Sep 11, 2017 3:04 pm

Swap the MAF over, retune base injector rate to bring fueling back into range and retweak fueling via Injector Multiplier table, that's it really.

No need to fiddle with MAF tables, your just creating extra work for yourself for no gain in the end, the MAF tables after stock in enhanced i have continued as linear. Even GM Figures for the MAF's between vehicle models change, they do this as they are measuring the real G/S that the particular intake flows with that MAF installed. Your changing all this anyway so the figures will still be wrong. At the end of the day the figures dont mean alot, higher MAF G/S = higher injector pulse and Lower MAF G/S = Lower Injector Pulse. More fuel or less fuel so changing the MAF tables will only mean you have to compensate in your injector multiplier tables anyway.

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Re: Understanding MAF Table Calculator?

Postby L67PSI » Mon Sep 11, 2017 5:14 pm

The1 wrote:Swap the MAF over, retune base injector rate to bring fueling back into range and retweak fueling via Injector Multiplier table, that's it really.

No need to fiddle with MAF tables, your just creating extra work for yourself for no gain in the end, the MAF tables after stock in enhanced i have continued as linear. Even GM Figures for the MAF's between vehicle models change, they do this as they are measuring the real G/S that the particular intake flows with that MAF installed. Your changing all this anyway so the figures will still be wrong. At the end of the day the figures dont mean alot, higher MAF G/S = higher injector pulse and Lower MAF G/S = Lower Injector Pulse. More fuel or less fuel so changing the MAF tables will only mean you have to compensate in your injector multiplier tables anyway.


Thanks for explaining things, the spreadsheet had me confused.

Would some data logs help get the fueling back in line? Or too risky to drive and make some changes / estimates first?

Thanks

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Re: Understanding MAF Table Calculator?

Postby delcowizzid » Mon Sep 11, 2017 5:49 pm

If you don't adjust the maf tables won't all the spark tables be wrong
If Its Got Gas Or Ass Count Me In.if it cant be fixed with a hammer you have an electrical problem

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Re: Understanding MAF Table Calculator?

Postby 0081 » Mon Sep 11, 2017 7:19 pm

Tuned mine on the v6 maf tables then changed them over and the car did run better.
Did need a few changes to the fueling

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