Scaling a 39 point MAF transfer to BE 30 point?

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04Lightning
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Scaling a 39 point MAF transfer to BE 30 point?

Post by 04Lightning » Fri May 15, 2020 10:45 am

New to BE and Quarterhorse, and was pegging my MAF 5V before redline.
Bought a new MAF from PMAS, and haven't figured out how to get their 39 point transfer into BE's 30 point "curve" ?

Is there a thread I missed that covers this?
If so, please let me know.

I put the lower 30 points into my curve in BE and cut slopes and breakpoint in half, along with cubic inches and got the truck running, but it is far from tuned.

Strategy URB1

Thank you,
James

Attached is the transfer function for the PMAS MAF I bought

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Re: Scaling a 39 point MAF transfer to BE 30 point?

Post by cgrey8 » Fri May 15, 2020 11:07 am

You have to selectively exclude points in the 39 curve to get it down to 30. My recommendation would be to remove every other point at the top-end of the curve. However now that you have it running, find out what the engine maxes the MAF out at. If your highest-possible MAFv voltages with your engine are, lets say, 4.1v, then you can eliminate most of the points above, say 4.3v (except the very top row). The very top row needs to remain representing the MAX possible value you can enter for a voltage (even if it doesn't make sense) and the max value from your MAF curve. This does also assume you will not be making any additional power-adder mods in the future that would push the flowrates into that no-longer represented flow range.

If your engine is producing values in the upper range, say 4.7v or 4.8v or you plan to add mods in the future to get into this range, then you are back to just eliminating every other point starting at the top of the curve. But I think it's safe to say, if you are going to drop points, you are best to drop points at the top of the curve, rather than the bottom or middle where you will spend far more time AND where drive-ability would be compromised.
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04Lightning
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Re: Scaling a 39 point MAF transfer to BE 30 point?

Post by 04Lightning » Fri May 15, 2020 4:04 pm

Thank you, that does make sense, and I will give that a try.
I appreciate your help thank you!
James

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Paulie
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Re: Scaling a 39 point MAF transfer to BE 30 point?

Post by Paulie » Sat May 16, 2020 1:23 pm

Here is my PMAS 3000 maf transfer function
Attachments
my maf pmas 3000kg.CSV
(694 Bytes) Downloaded 8 times
1990 Mustang 5.0, HCI, Vortech S-trim, FRPP 42# inj., PMAS MH95, A9L, Moates Quarterhorse, BE/EA, Innovate LC-1.

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04Lightning
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Re: Scaling a 39 point MAF transfer to BE 30 point?

Post by 04Lightning » Mon May 18, 2020 9:28 pm

Paulie wrote:
Sat May 16, 2020 1:23 pm
Here is my PMAS 3000 maf transfer function
Thank you for that.
I will see how that works out for me.

James

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