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Old 03-03-2012, 05:00 PM   #106 (permalink)
Olympiadis
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Join Date: May 2010
Location: Illinois
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White2003Focus - '03 Ford Focus SE 4-door sedan
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Quote:
Originally Posted by drmiller100 View Post
My small, sacrificial engines are 2 stroke snowmobile engines making 200 horsepower per liter off squeeze, and 250 on the squeeze, honda car engines (stock) and chevy small blocks.

What do you use?

My preference is the Chevy small-block SBC1, because that's what I have the most of, - most parts and tools for. There's about ten complete ones in my shop right now, and lots of spare components. Why would you ask that?

Of course I work with other configurations, but there are so many out there that to be as competent with each is unrealistic, and given the special tools involved for everything from engine and cylinder head work to ECM tuning, it is not financially reasonable for an individual.

If your question was to determine range of experience with engine tuning, then I first started tuning work with electronic engine management in 1994 using the GM 165 ECM and Accel DFI. I am familiar enough with a few other stand-alone systems, but my preference is with the older factory GM ECMs (OBD1) because of the level of control I can achieve with them.

Stand alone systems give a great range of calibration control and some very nice extra features, all within the range of the user interface limits.

Some of the tuning suites like EFI-live and HP-tuners give a remarkable amount of access to most of the tuning calibrations involved with OBD2 systems, but not all, and no access to the code or algorithms themselves.

With the older GM OBD1 ECMs I have complete access to the running code.
This is an advantage to me because I learned machine language programming for the 6502 processor when I was in school, and the knowledge translates directly over to the M68HC11E processor family. This facilitates my ability to both read and write in the language of the code that runs in the ECM. Being able to write code, or "patch" as some call it gives far more power and control over tuning ability. Being able to read it allows you to see what is really happening behind the scenes with electronic engine management, and gives much insight as to what the automotive engineers, particularly the programmers were trying to do, and what they were physically able to do. That is why my preference in each case to engines and ECMs.

Does this answer your question fully?
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