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Minotaur Automotive Tuning Software
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  #1  
Old Wed, October 14th, 2009, 11:35 AM
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Originally Posted by JackandJanet View Post
Guys, I'm going to ask a question here. That figure "65535 rev/mile" seems awfully high to me. There are 5280 ft in a mile. If a tire rotates 65535 times in that distance, it only covers about 0.081 feet per revolution! You're running on really tiny tires (diameter would be about 0.31 inches)! Are you sure that rev per mile figure is correct?

- Jack
It's not correct, Jack. With the 95-97 trucks, the data given in the tuning software shows a 64:1 final drive ratio and a 65535 rev/mile. Why? I don't know but it has little to no effect on the operation of the vehicle even when correct numbers are given like 4.10:1 or 635 rev/mile. I don't think that the PCM in those trucks use that particular value when figuring shift points. The automatic-equipped Super Duty trucks are sensitive to those values though.
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Old Wed, October 14th, 2009, 07:57 PM
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Originally Posted by cleatus12r View Post
It's not correct, Jack. With the 95-97 trucks, the data given in the tuning software shows a 64:1 final drive ratio and a 65535 rev/mile. Why? I don't know but it has little to no effect on the operation of the vehicle even when correct numbers are given like 4.10:1 or 635 rev/mile. I don't think that the PCM in those trucks use that particular value when figuring shift points. The automatic-equipped Super Duty trucks are sensitive to those values though.
OK, I've got it now! It's really just the largest signed integer the processor can store: 2 ^ 16 -1. (I knew the number was familiar to me from somewhere). The processor is a 16-bit machine and for some reason, it's holding a hex value of 7FFF - "maxint", in that position). Doesn't look like it serves any useful purpose at all though. Wonder if the good Doctor knows anything about it?

- Jack
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Old Thu, October 15th, 2009, 02:16 AM
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The tire size and gear ratio values on the 7.3L (particularly the OBS trucks) don't do anything. The reason you are getting 65536 and 64 is because those values are pointing to "dead space" in the calibration.

As Jack indicated, the values are related to hexadecimal numbers, although those particular values are unsigned so the hex would actually be 0xFFFF (65535). However, Jack is correct that for a signed value, 0x7FFF (32767) is the max and 0x8000 (-32768) is the min.

Hole that clears it up.
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Old Thu, October 15th, 2009, 06:53 AM
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Great, thanks for all the input.
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