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Converting Power FC timing maps to Megasquirt


Old 09-16-11, 01:58 PM
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Converting Power FC timing maps to Megasquirt

Some of you may know that I run a tuning discussion group that was originally started by cewrx7r1 (Chuck Westbrook). Our members run a variety of engine management systems, but the majority are using Power FC. A lot of turbo Rx-7's are running Power FC so there are a number of maps floating around for that platform. One thing that's unusual about the PFC is its load units. The load units are in kg/cm^2 absolute pressure, where every 1000 units is .1 kg/cm^2. So here are some timing maps translated into more usable absolute pressure units.


That's a leading from PFC version 5.08 which is what most FD PFC's come with. There may be hundreds, perhaps thousands of FD's running a variation of this map.

That's from an early version of the PFC, 2.01

That's from 3.11, the version for the FC series 5 Turbo.

Trailing Split

Most of the trailing/split maps that came with the PFC are kinda ugly but here are two of them.

That's from 5.08, the most common Power FC basemap. I think for most applications it could use more split in the high boost areas.

That's from 2.01. Overall it's a safer split map than the other base maps but it does have a weird spot on the 7600rpm column. The 3.11 (S5 T2) split map is not even worth posting.

Hope that's helpful for you guys who are wondering how your maps compare to what people are running on other systems.
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