BikiRom questions...

Your premier source for information on the Turbo KA: KA24E-T and KA24DE-T (KA with aftermarket turbo kit)!
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Drift Machine
Posts: 1074
Joined: Wed Jul 24, 2002 8:30 am
Car: 1991 KA-T 240sx
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First, my setup:370cc puprle top SR injectorsStock MAFAeromotive Adjustable FPRT3/T4OE 60 Trim .53 A/R (5.8 PSI)Innovative Wideband O2BikiRom USB Multi-board

I know I should post this on the BikiForum, but I tried registering and it appears to be not sending me my conformation e-mail, so I figured I might as well try here.

I was able to get the car running just by going into the ECU/Config and changing the injectors from stock to SR injectors (says they are 386cc?). Then I realised that the purple tops probably weren't suppose to have the same invalid dead time as the stock injectors, so I went looking to see what it was. The stock .bin.bbd file (Base Data) for the SR20DET says that the IDT is suppose to be .725ms for the purpletops. Changed my tune so the IDT is .725ms, made the car run smoother.

After that I decided to lookup to see if the injector scaling factor that was corrected by BikiRom automatically by changing the injector settings in the ECU/Config was correct. I came across a "K value" (same thing as ISF) calculator that I believe deviousKA created. Using the calculator I got a "K value" of 17,957 but the ISF number that BikiRom gave me was 20,160. Anyone out there know which one would be the right one?

Also it appears that there are two different base files for the S13 KA24DE, different primary fuel table values, so which one is the actual correct base data? 53F00_ka24de_s13_usdm.bin.bbd or 53F00_s13_ka24de.bin.bbd?

It doesn't look like the Throttle Enrichment settings change automatically when you change the ECU/Config settings. Should I just go through and change them based upon the change in injector size? (270/370) * (original TE settings) = (new TE settings)? Or leave it alone?

Also, what do guys do about fuel pressure? Should I just try to keep it stock, or run it a little lower? Right now it's set to ~37psi at idle.

Any help is much appreciated! This is my first time trying to tune with anything more than an Apex-i SAFC II, so be gentle


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