TAQuickness

iTrader: (28)

I just recieved a GM 85mm MAF. The MAF came off an '02 Tahoe. I have the MAF table from the 02 Tahoe, and '00 Vette and an '01 Vette. All three tables are different, so which one do I start with.

FWIW, This MAF will be used in a '00 WS6 M6.

2000Firehawk

iTrader: (248)

I would start with the Holden table.
With just having 'bolt-on' mods, this table was a prefect fit.

Another_User

You beat me to it. Holden.

TAQuickness

iTrader: (28)

Does it make a difference that this is a 383 with all the bolt ons?

MNR-0

Nope. No difference. A MAF still sees all air. Scale away.

Another_User

It is directly related to the "shape" of the air flowing over the sensor due to intake changes and modification to the sensor (porting). The sensor doesn't care how muny cubes you have under the hood.

SmaknaSS

iTrader: (1)

Does anyone have a holden MAF table? and where can I get one to copy into LS1 edit? I would like to see how it would match up with my timming table.

jimmyblue

iTrader: (11)

The Holden table is for 75mm MAFs, which they still use
down under.

For an 85mm I have been using the 6-liter ZL1 truck table.
I don't think you'll go worng there, it's slightly richer than
the rest which is less troublesome to tune out (worst is,
it'll cost you a tiny bit of spark and you might have to skinny
PE down a hair). Better than chasing down ping.

I just posted a big blob of tables in the other thread.

SmaknaSS

iTrader: (1)

Damn. I ment that I wanted to see how my timing table would respond to the holden MAF table.

MNR-0

Here is the stock 75mm Delphi/Holden MAF table:
2.14 2.59 3.07 3.59 4.15 4.74 5.4 6.1 6.85 7.67 8.55 9.48 10.5 11.59 12.76 14.02 15.34 16.95 18.66 20.52 22.29 24.16 26.16 28.26 30.48 32.83 35.3 37.91 40.66 43.54 46.57 49.74 53.06 56.55 60.19 63.98 67.95 72.09 76.41 80.91 85.58 90.45 95.5 100.74 106.2 111.84 117.7 123.76 130.04 136.54 143.26 150.2 157.38 164.79 172.44 180.32 188.46 196.84 205.48 214.38 223.53 232.95 242.64 252.6 262.84 273.37 284.17 295.27 306.66 318.34 330.33 342.62 355.21 368.13 381.35 394.9 408.77 422.97 437.5 452.37 467.58 483.13 499.02 511.99 511.99

Here is the stock 85mm Delphi/Holden MAF table:
1.57 1.85 2.17 2.55 2.98 3.45 3.95 4.48 5.07 5.73 6.43 7.2 8.02 8.91 9.84 10.84 11.9 13.05 14.27 15.59 16.99 18.52 20.14 21.86 23.66 25.57 27.58 29.71 31.93 34.26 36.69 39.25 41.96 44.87 47.91 51.12 54.41 57.95 61.59 65.38 69.38 73.48 77.78 82.24 86.81 91.66 96.63 101.77 107.16 112.67 118.43 124.38 130.46 136.84 143.34 150.02 156.95 164.02 171.38 178.95 186.66 194.8 203.1 211.66 220.54 229.6 239.02 248.68 258.52 268.77 279.23 289.98 301.16 312.55 324.4 336.62 349.08 362.22 375.66 389.52 404.04 418.89 434.44 450.55 467.05

As for timing, irrelevant. The MAF will only affect AFR. Consequently if your AFR is out enough it may cause lean conditions and detonation. The only way to dial it in with your custom setup is with the narrowband O2 sensors and monitoring average LTFT.

jimmyblue

iTrader: (11)

Timing indexes off dynamic cylinder air, which comes from the MAF
reading. This is a big part of how the aftermarket MAFs "add power".
Lower indicated airflow makes less CylAir makes more advance.

Trans line pressure also indexes off load (somehow) which uses
MAF input (and is why people complain of soft slow shifts when
they hang a GMAF on there).

Not that there's a huge difference between the various 85mm
tables, but there's some and I feel that the "richer" side is more
benign, side-effects-wise.

SmaknaSS

iTrader: (1)

Big thanx for your help, but I would have to beg to differ (Not trying to flame anyone) I would have to agree more to what Jimmyblue said: (Timing indexes off dynamic cylinder air, which comes from the MAF
reading. This is a big part of how the aftermarket MAFs "add power".
Lower indicated airflow makes less CylAir makes more advance.) I dont Know how the PCM indexes in SD mode though yet, I'm just getting back into the tuning again after a year.

MNR-0

Well I didn't know that, but it makes sense. No flame intention taken. It's good to share knowledge. Explains why I am reading slightly more dyn CA too.

(Ken)-Blown-383 4x4

Anyone here try this on an old body style truck yet?

My stock maf sensor is maxing out the flow at 4700rpms at 326 with a supercharged 383 with just 5psi of boost...I got the 85mm ZO6 maf and adapter cable...I also have the tunercat full edit pcm programmer on my labtop...I've also been told to dial in the PE table at part throttle first then go for the VE table....it's going to be fund doing that and the maf table!

Going to order a LM1/LM3 wideband in about a week or so.

Any suggestions?

Also here is what Tunercat is saying my MAF Sensor Air Flow vs. Output Frequency table is 1488 TO 11216Hz.
2.51
2.92
3.38
3.88
4.46
5.09
5.79
6.57
7.41
8.30
9.28
10.30
11.40
12.56
13.82
15.17
16.61
18.20
19.90
21.68
23.58
25.60
27.72
29.94
32.28
34.70
37.24
39.92
42.75
45.74
48.88
52.19
55.69
59.39
63.26
67.31
71.53
75.93
80.48
85.21
90.08
95.14
100.38
105.81
111.44
117.25
123.24
129.44
135.83
142.42
149.17
156.21
163.48
170.97
178.65
186.71
195.04
203.66
212.57
221.79
231.32
241.16
251.32
261.79
272.61
283.74
295.21
307.01
319.14
331.62
344.41
357.54
371.00
384.79
398.89
400.00
400.00

Ken

(Ken)-Blown-383 4x4

This url shows some pics I took today comparing the MAF of my L31 to the Z06 along with the venturi measurements...

http://www.pacificp.com/forum/viewtopic.php?t=489

Ken

dr.mike

I am working on a procedure for characterizing a MAF sensor using a wideband.

http://67.43.173.134/StupidWidebandTricks.htm

Still a work in progress.

(Ken)-Blown-383 4x4

Mike....send me a pm when you finish...I am also a dealer for IM...we did a GP for it on the PPE/FSC forum a bit back....I did have one but sold it before I could use it...doh! My truck was still apart at the time and I wanted to get the latest unit anyway...as soon as I sell my trans and rear end on ebay I am buying the LM1 and LMA-3 Logger....I already have a Matco Scanner...which bites big time...I really want one for my laptop.

Ken