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Manufacturing economics is something you would do well to understand. There is a big difference between a part that is generic and applies to millions of vehicles versus a part that is unique to a particular vehicle, especially mk3 supra which had pretty small production run numbers, and is...

Because the ECU will not switch instantly to/from open-loop when conditions are met, there is a count down timer for the switch, and its on the order of a few seconds if I remember correctly. Also, it requires more load to switch over at low rpms. You would have to datalog to capture what is...

In order to dial in the engine management with the sophistication of the factory ECU, you would need to spend hundreds of dyno hours in a climate controlled room to cover the operating conditions a car sees in daily operation. The stock ECU (25+ years old now) has over a hundred maps and tables...

Stalube 4344 fluid oil pump

I'm here to correct bad information, and what you wrote is wrong. I'm sorry if I hurt your feelings in the process. I've spent many hours figuring out the ecu code, so I know how it works. As for the questions about when does the ECU go open loop, I will repost here what I have posted...

Sees max air at 3500 rpm, huh? The ECU tables are based on load, more accurately volumetric efficiency, which is (measured mass flow per crankshaft rotation / theoretical mass flow). The tables go up to redline and ~100% load, there is nothing special about 3500 rpm.

I don't know of any HDMI-to-CV cables, but there are some adapter boxes like this one. http://www.amazon.com/ViewHD-Universal-Composite-Converter-Standard/dp/B0080KN18K

Then you need to find another hobby.

Have you heard of ebay? Search for TOYOTA SUPRA MK.3 CLEAR SIGNAL LIGHTS

Use the brackets on the windows calculator to get the right answer.

Can you tell me which double-din stereo has HDMI inputs? I can only find composite video inputs on the ones I looked at.

Fans are triggered by A/C coolant temp switch and/or A/C high pressure switch. http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=144

Low brake fluid might explain the first issue. Pull the codes from the ABS to diagnose further.

Check the hoses from turbo outlet to IC. They get the most abuse from the hot air coming out of the compressor. The hose you refer to in the side question is the PCV system. No fluids in there, jut engine blowby.

No, if you want to stay closed loop all the time, you need to rewrite the software to do so. A piggyback would never be able to make this work. You don't want 14.7 AFR at WOT anyway, and that's all this ECU will give you closed loop. It could be done with our daughterboard and a lot of...

Actually its pretty straightforward. There is a map versus rpm that is compared against the current engine load. If the load is > than the map value it goes open loop: 2800 rpm 48% 7600 rpm 0 % So for rpm <= 2800, if load exceed 48% it goes open loop. As the rpm increases, the threshold...

Probably doesn't matter in this case, but the acc feed goes dead during cranking. Wouldn't recommend it for a piggyback.

Maybe you can start by rereading this thread. Plenty of advice has been ignored.

You're kidding, right?

It takes about 1-2 minutes for the stock ECU to go closed loop after a cold start, so your observations seem correct.