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Here's an interesting discovery for all the fans of EGRless operation, and the counterparts arguing strongly against it. To convert the ECU to use the JDM maps and delete EGR you simply need to add a 100 ohm resistor to R606 and you will be in business (only verified on 7MGE 86-88 ECUs, but I'll...

A status update really. We have fully reversed the ECU hardware now, thanks mainly to Henri (Brutus), and have mapped all the ECU inputs to the respective MCU pins. The only remaining input issue is to map the ADC channels to the ECU inputs (we now know ch0 is AFM and ch6 is TPS, and think ch4...

I recommend these if you really want something the same size as the stockers. These are not plug and play. You need to remove the shield and grind the ferrite assembly down to fit. http://www.supramania.com/forums/showpost.php?p=1290874&postcount=10

It does sound like something that is not working when it gets hot. Have you checked for codes? A bad ignitor would normally set one.

There is stuff out there, but not public domain except for the USB middleware. What I have so far is written by me in VC++. That is why I say 4-6 months. Coding is slow going especially when you have a real job to take care of so the family can eat!

You need a serial to USB chip and a few additional parts. I would imagine that a small daughter board (0.75 x 1.5 inch) would be sufficient. Most likely would cut a hole in the side of the ECU to stick the USB connector through. Details are TBD for now.

Yes. The actual knock signal processing is done on a separate MCU chip and the output of that computation sent to the primary MCU where it is used as an input to the ignition calculation. I'm still working on understanding the details. Its only 12kB of code, but they packed alot of complexity...

The only reason this diagnostic capability is there is for the Toyota engineering and QC teams that worked on software/hardware. You can read out any variable in RAM in real time, that includes all the diagnostic and operating mode flags in addition to any computed variables. There is other...

87-88 7MGEs have it. At least it in the TEWD and the software in the ECU supports it.

You really want look at variable 0A6h!! That is the location in RAM of the computed 16 bit injector duration for the 87-88 7MGE ECU. The TCCS has hidden diagnostic capability that blows the doors off of OBD2. I'm about 4 to 6 months out from demonstrating it. It does require some minimal...

Can anyone explain why the pusher fan control circuit includes the headlight switch? It looks like the fan does not run if the headlights are on. Very strange. http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=144

Aren't there a couple of oil plugs in the block around that area that could leak?

R-134a has a critical temp of 214F vs 234F of R-12. With less efficient condensers, portions of the condenser may hit 214F in low flow stop-n-go conditions, at which point the R-134a will not liquefy at all or very little ... leading to poor performance in stopped traffic/low air flow periods...

However, the head has one big coolant port that does match the HG cutout. The real question then, is why the head port doesn't match the block. Maybe the smaller block port and obstructed gasket port is used to balance the coolant flow in the engine (less coolant on the cooler intake side), a...

Getting back to the OP questions, the Titan and others are just copying the OEM headgasket coolant holes that do not line up with the block port. Its a mystery, especially since it weakens the gasket in that area. There's plenty of pictures around of BHGs with that thin bridge separating the two...

Any comments about how these systems work? I read reviews and see complaints about freeze up and slow booting and so on. Is it real, or are these just from grumpy people whining?

no english needed, I'll write it out in C++ solenoid != switch

I remember I had to trim down the stud they supplied for fastening the pipe to the chassis, otherwise I couldn't get the tab on the pipe to hook up.

After 87 model year the lower IC piping does not vary, even for California!

My 90 has the cast elbow, and its ID is definitely smaller than the Speed-Source pipe. That said, I do think the speed source pipe diameter is a little small. I vaguely recall it was 1.75" diameter (been a while since I put it on), a little smaller than the stock lower rubber tube. The cast...