Re: Powerjection installation
I don't know if you talked to Cody at Retrotek yet but I spoke with him for a few minutes yesterday. Here is some of the insight he gave me. I just copied it from a post in Fred's thread. He has the Powerjection I and it wants to fall apart under 2K.
Fred, you may have the same issue I do although more pronounced.
I talked to Cody at Retrotek today about mine running so rich at idle and low speed. He said that for the base map to autotune, it had to be within a certain range already because it would only add or subtract so much. They did that because guys would run their cars out of gas with autotune running and the program would jack the fuel addition in the map way up then the car wouldn't want to start because it would flood once they put gas in it. So essentially if the map is already way rich it will only bring the value down 25% and no more so it bottoms out.
Cody said to get the idle cleaned up, to start it cold and then gradually bring the torque value you input to create the base map down lower and lower and recalculate (it loads the map immediately when you recalculate) until it cleans up. Then when you're close, autotune will kick in at 150 degrees coolant temp and be able fine tune it the rest of the way. The base fuel curves are directly related to the torque value you input but he said it's not a perfect world situation.
Now, I went out this morning and the first thing I did was turn the key on, open the software, and check the fuel tables. Sure enough there was -25 in several cells which meant it had subtracted the maximum amount of fuel it could. So I changed my torque value in the fuel calibration map to 490 (was 525) and recalculated. I hit START and the car immediately fired up and held idle. It has never done that cold before.
I then lowered the torque to 470 and recalculated. The AFR came up some and so did vacuum. So I took it out for a 25 mile drive or so to heat it up and let it start autotuning from there. It was still running rich at light loads (high vacuum) and lower RPMs. I have a 0.64 overdrive and 3.42 rear but was still able to tool around at 1500 RPM in fifth gear and take some rolling hills.
I got home and let it sit running while I played with the software some. The idle had come up to about 1100 or so and low AFR (rich). I am running with the idle cell enabled and noticed that it was supposed to go to the idle setting (can see it in the fuel tables or real time data) at a vac reading of 50, below 1200 RPM, TPS less than 3. I had everything but the vacuum and it was reading high so it was jumping back and forth between the idle cell and base fuel map for low RPM. I changed the vac to 70 and it went into idle mode which has a 13.5 AFR target right now.
It wouldn't get there so I kept dropping the torque down and recalculating. At 400 lb ft it jumped lean finally and then was able to tune to 13.5 and vacuum came up. You could hear the exhaust note change. I turned the throttle blades down a little to get my idle closer to 800, shut it off, and did a TPS recalibration.
I think I'm getting somewhere now. I think a combination of the cam profiles you have to select and torque values can throw the fuel map out of whack. What I hope doesn't happen is that at high RPM's it can't get enough fuel because the fueling goes to +25. I'll drive it some more tomorrow and see what happens.
The FAST system probably doesn't have this issue because there is probably not a limit on the fuel it can add or subtract when it is autotuning. Since the Retrotek unit does have the limit (because of people running out of gas and complaining) your base map has to be within 25% of where it needs to be right off the bat so it winds up limiting what autotune can do.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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