99 Montero ECU, 92 Stealth TT

[aaronatstate]

After some investigation, it was discovered that 98 and 99 Montero ECUs shared the same circuit board with 98 and 99 VR4s. There are a few differences in the boards. The Montero board is missing 39 pieces, and has 4 that the VR4 board does not.

However, most of these missing pieces, are not needed for the majority of people who want a tuneable ECU. They are for things like the stock boost gauge, boost control, active exhaust, and a few other small things. One thing its missing is 2 of the 4 02 sensor paths, not a big deal for 1g cars, but the stuff would need to be soldered on for 2g's, or people who need OBDII. The most major thing missing, is the 3 pieces in the knock sensor circuit. Once the correct surface mount parts are soldered in, it works just fine.

Anyway, I had an adapter harness made for me, that included an OBDII port, and flashing enabler cable. I got it from a Brett, and it is awesome. The only problem was the AC controls weren't hooked up 100%, but Gatecrasher and I managed to figure it out, and got the AC working.

So Gate and I got it installed, and we flashed 99 VR4 code onto the ECU. Flashed it for 450cc injectors, and started it up. Started up like stock. After doing a few test drives, was getting knock, just like my original ECU with SAFC. Got into editing the timing tables. First thing that needed to be done was to account for the latency differences between the 1g cam sensor, and the 2g cam/crank setup. After calculating that at different RPMs, and taking out an additional 2 degrees for my higher compression pistons, and all the knock went away. Also all the knock I was getting at low RPMs and high load, i.e. flooring it in 5th at highway speeds is now gone as well.

So I know have a 92 Stealth TT, running a 99 Montero ECU, with 99 VR4 code. I have 13t's set to 14psi, 450cc injectors, all the other supporting modes, running 91 octane, and not a lick of knock. Also have a fully flashable ECU, and the best part is, my total investment will be about $450 bucks, for the ECU, harness, and a Tactix Openport 2.0. Another amazing thing is, it has 100% stock driveability, I got 24.4mpg with it, and its only using 1 02 sensor for right now, and no tuning has been done on the closed loop stuff yet.

TL : DR - 99 Montero flashable ECU with 99 VR4 code running a 92 Stealth TT with bigger injectors, and bigger turbos. Stock driveability, and full control.

Anyway here are some videos.