Playing around with the 2.7 software (ECU and TCU)

[703JRB]

Originally Posted by Adrian D

If you can read it, I can do it remotely. You need a KTAG interface to read the TCU.

Flat cost of 105USD. If you can't read it, there are 2 options: ship your TCU or I ship you a used TCU at the cost I can get them (around 30-40USD).

I should be able to read it. Would this include tuning or just the ratio change?

Cheers Joe

[RTB]

Well, unless someone can give me a better app for measuring 0-100 times, looks like I am done.

3 runs below 9 seconds, 1 above. Each start I chirp the tyres. The run above 9 seconds actually resulted in wheel spin on dry roads with 265 AT's, full fuel tank. This can be clearly seen in the data. Diff took up and grabbed it pretty quickly.

8.3 sec, 8.8 sec, 9.9 sec, 8.9 sec

Wheel spin can be seen with the 1.8 seconds to 27 km/hr. Longest time for this speed by far showing delay getting off the line.



There is something a little weird I don't understand though. I get a small amount of smoke when I tramp the throttle. Small enough that it is not visible during the day, only at night in the headlights behind me. I'm not a fan of smoke, so I lowered all the IQ values in the smoke map to reduce the max amount of fuel injected until the boost builds. Just did it as a direct ratio to boost pressure. Most values only decreased by no more than 5 mg/stroke (~10%). Plan is to reduce by 20% to match the amount of fuel that I measure going in versus what the ECU thinks is going in.

1st gear noticeably revs out quicker and I think is the primary reason for the change in times. Boost response is improved. My boost used to build ramping up to set point. Now it rises much more quickly. I even get little boost overshoots occasionally.

How???? I can only think it might have something to do with more efficient use of the turbine and allowing slightly higher exhaust flows, but that might be clutching at straws. Smoke map uses current boost to set a max fuel. This max fuel then limits how much more boost can be called for while it waits for the turbo to produce the actual boost being asked for. As the turbo produces more boost, the smoke map allows more fuel. So basically the target set point for boost is always closer to the real boost with a lowered smoke map. I would expect it would mean slightly more open VNT. Also, maybe just due to being a better AFR? With too high a smoke map, the AFR would go too low maybe? Reducing the smoke map would result in a better AFR during boost building times.

Loving the new excel ECU reader. 246 value changes to the maps with a couple of formulas and a click of a button. That would have taken ages the old way.