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post #1 of 6 Old 03-18-2009, 11:55 PM Thread Starter
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looking for flow sheet

hey guys, i need a flow sheet for a 3" protube setup for 39#'s.
the one that came with it doesnt seem right, it's only 9 points and at the highest point the reading is like 1200kg/hr at 3.84 volts.
is it just me or is something wrong here?


96 Cobra: 5.0 swap, T5, On3 67mm BB turbo, Megasquirt, EDIS,
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post #2 of 6 Old 03-19-2009, 09:42 AM
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you have to do a 10 to 30 point conversion like they have on tweecer. if you have 9 points just make the first point 0, 0. 1200kg/hr @ 3.84 would be like 1600kg/hr at 4.5 volts, remember the curve is exponential not linear. Its probably close to 2000kg/hr by 5 volts. How did you get it setup for 39# injectors? is it custom, what injectors do you run. If you run tweecer make sure to set your MAF max to 4.99 volts from 4.7. If you have no way of tuning then this all doesnt matter, but yeah those data points seem valid for a 39# MAF.


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post #3 of 6 Old 03-19-2009, 02:45 PM Thread Starter
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thanks for the help man, here's my setup.
i have 42's, but i bought the MAF used and the seller had it setup for 39's. i have a EEC tuner so i figure it shouldnt matter anyway just plug in the right numbers for the injectors and then the transfer function for the MAF, but i was thrown off by the highest reading being 3.8 volts.
i thought to do a 10 point to 30 point you still needed the highest and lowest numbers.

96 Cobra: 5.0 swap, T5, On3 67mm BB turbo, Megasquirt, EDIS,
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post #4 of 6 Old 03-20-2009, 01:49 PM
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On EECtuning I was advised to use 0,0 as the first point since it is correct and a known value. Based upon the known values provided on the calibration sheet the program generates a formula that will make any input voltage the proper flow numbers within a small error. On the newest MAF I purchased from pro-m they only gave me a 2 point flow sheet, I called them and they said it should be a standardized curve and I would only need to multiple everything in the stock transfer function by 2.21 (42/19) to get the proper transfer function. I did this and everything is working fine. In your case with a 9 point im sure they didnt have it standardized to the stock MAF yet, but I would bet if you take any point in the stock transfer function and multiply it by 2.05 (39/19) you should get the x,y coords similar to what was provided in your calibration table.

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post #5 of 6 Old 03-20-2009, 04:37 PM
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Quote:
Originally Posted by 94saleengtvert View Post
thanks for the help man, here's my setup.
i have 42's, but i bought the MAF used and the seller had it setup for 39's. i have a EEC tuner so i figure it shouldnt matter anyway just plug in the right numbers for the injectors and then the transfer function for the MAF, but i was thrown off by the highest reading being 3.8 volts.
i thought to do a 10 point to 30 point you still needed the highest and lowest numbers.
You guys LOST me LMAO but IF you need a 9pt flow sheet for 42's let me know I have it sitting right here..


my high is 4.0550 V @ 1248.66 kg and my low is .5547 v @ 31.05 kg

Not sure what it means or if you even need it but there ya go lol

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post #6 of 6 Old 03-20-2009, 10:02 PM
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my 3" pro tube is the same way. it stops at 3.xv & 12xx kg/hr. I was getting a weird map on the tweecer with it too.

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