Can Alpha-N advance curve be converted to MAP curve?

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twincam
MS/Extra Newbie
Posts: 13
Joined: Sun Mar 27, 2016 5:29 pm

Can Alpha-N advance curve be converted to MAP curve?

Post by twincam »

I have an installation which ran using an ECU other than Megasquirt and had a well developed advance mapping sheme. It was Apha-N based and therefor the mapping was TPS percent vs RPM. We’re now converting to a MAP based Microsquirt installation which controls advance as kPa vs RPM.

Is there such a thing as a method I can use to convert a TPS/RPM map to a kPa/RPM map?

(PS I do not yet have a .msq file because the current installation uses a Specialist Components ECU with a completely different file format.)
Matt Cramer
Super MS/Extra'er
Posts: 17499
Joined: Thu Apr 16, 2009 8:08 pm

Re: Can Alpha-N advance curve be converted to MAP curve?

Post by Matt Cramer »

Data log the engine running and use that to create a table of what throttle position you are seeing at each MAP and RPM reading.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
twincam
MS/Extra Newbie
Posts: 13
Joined: Sun Mar 27, 2016 5:29 pm

Re: Can Alpha-N advance curve be converted to MAP curve?

Post by twincam »

Thanks! That make perfect sense and seems like a universal way that compensates for variations in throttle body size, intake track length, et. al. that would make a mathmatical conversion very complex.
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