I modified the EE speedometer calibration spreadsheet for the 90's model B/F/Y body GM cars and have attached it. You can input your metric tire size (eg 275/40-17) and it will calc the revs/mile. The instructions are on the face of it.
Not sure if this is the right section to post, if not please move the thread.
UPDATE: Spreadsheet has more tabs for other calcs and has been renamed, original file deleted for clarity. Speedometer correction fields added for too slow or too fast to change tire diameter. Added functions include calculators for displacement increase, ethanol gas, and fan temps. I also included the website to enter your VIN & get the original calibration ID. Sheet is color coded, Green= Data you enter, Blue= Calculated data, Yellow= Info only.
UPDATE 2: Clarified the displacement percent field, and limited it to 4 decimal places. I made it read like this in the event the user wants to multiply (or reduce) a table by a certain amount. A 9% increase here will be shown as 1.0900, not 9.0000. If displacement is reduced, the same applies, for example a 350 destroked to 340 CID would show as .97xx.
I will keep the latest version of the spreadsheet in this post.
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