openecu.org

1.28 rocks Just reflashed my JDM Evo 9 GSR ECU (JM885708) quickly and easily. Changed the fuel, timing, VVT, boost limit and reduced the lean spool RPM from 3500 to 2500 RPM. I flattened the fuel map so that it is richer in the midrange and leaner at the top (it was >>12:1 mid, 10:1 at the top - I want 12:1 mid, 11.0-11.5:1 at the top, or whatever it seems to like). I took a degree of timing out at 6000 and 6500 RPM from load 200 upwards on all four high octane ignition maps. I advanced the VVT to 24 degrees in the spool areas. Verified the checksums all OK and the car starts.

I will test it this afternoon with the wideband and knock monitoring and see if it has got rid of my lean spool up, lift off det and det at 6500 RPM problems running the AVC-R with the stock ECU at high boost.

Thanks Colby!

First map seemed to do the trick with much nicer AFR, quieter knocklink and perkier at the top from the correct fuelling. Additionally it allows me to run the boost I want to.

As usual I'll test the map over mixed driving in a variety of temperatures but I'm very happy that the first guess is so near and everything runs so smoothly.

Spool up is 200 RPM earlier presumably from advancing the cam timing

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