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ARP bolts are 1/2" 12pt, at least mine were. ARP stud with nuts are 9/16" 12pt, which is so close to 14mm (14.3mm) that they both fit.

I am building two prototypes for beta test, then will look into a small contract build if that goes well.

Well duh! I mean Moore's law has been working for 23 years now. The point would be that the tweaking you refer to is beyond 99% of the tuner shops in the world. You need a test bench where coolant temperature can be held at any value, environmental control of temperature, pressure and...

I have not seen any plots of the stock AFM versus flow rate. Would love to see that data. Given it is smaller than the Lexus AFM, it seems reasonable that it would have a smaller peak flow rate. I would guess that for flow above some critical value other modes can exist that would cause the...

There's a reason you don't see speed density on production automobiles any more, and they were only ever on the low end models even back then.

Toyota offered a keyless entry retrofit kit for the supra stock alarm for a very short period of time. They quickly sold out when the community found out.

Suction is a very common term used in the A/C world when referring to the input side of the compressor..

Depends how far off from the ECU's fuel model you are. On my car, I really don't feel any difference between a fresh reset and after some driving time because I am very close to what it is expecting. This ECU doesn't have much retained memory (only 16 bytes) so there isn't much to learn, and...

Post your test numbers, or better yet start your own new thread

To just read the data stream you need a serial bus running at 1 Mbaud and a few wires to the SIN and SOUT pins of the internal MCU. In practice, it is best to have a daughterboard that can manage the synchronization since the bus is shared with the A/D converter...

The stock 7M ECU will do 200 samples per second of any 16 bit value in RAM. Not bad for 1986!

He needs to reduce his combustion temps, his 02 is normal. I wish my HCs were that low. Last week I tested at 75ppm, which also happens to be the 'new' limit for 1990 auto. Previously it was 109ppm. I would even take OP's 85ppm, which is for manual trans cars. I'd love to know the logic for...

Yeah, that's a surprise, not! :nono:

While the solenoids used in injectors don't care about polarity, other types sometimes do, such as the voice coil motor in a speaker. As an EE you should spend some time and learn more.

Fascinating. The NSW caused a grinding noise?

I don't suppose you checked for any ECU codes?

Well, now there's three unhelpful comments, but realistically, the OP provides no useful information that anyone could use to provide anything but a WAG response to his problem.

How are you testing the cap to know if it is is bad? You can buy caps online at mouser.com. digikey.com, newark.com, and so on.

Actually, I think it might even be 1.75" diameter come to think of it.

The stock cast elbow is after the rubber hose clamped to the turbo compressor outlet, and before the hose to the IC inlet. It is about 2" in diameter as I recall and you can only see it from under the car. There used to be a metal pipe from Speedsource (speed-source.net) that eliminated it. I...