Inliners International Forums General Discussion Hi Performance GMC Camshaft Advice

To get shift points, well as I was saying, here is my method with the Gonkulator and your car (as best I can Gonkulate it tho I cant match your 60ft, 1/8, et and MPH, the 15.90 doesnt fit with the other numbers).
But here is what I get:

6000 15.19 at 90.51 Best/Lowest ET
5500 15.29 at 89.70
5400 15.32 at 89.64
5400 15.46 at 89.06 (shift 5400-5000-5000)
5000 15.50 at 89.09
So I would give up my "tenth" and save the engine 500rpm by shifting at 5500. OF course if going for a class record you cant do that but its a lot easier on the budget.
If you shift another 500 early, at 5000, you give up TWO more tenths, now its kind of wasting the engine.

Beyond the Gonkulator, CNC's idea will help but even then you need a Gonkulator of some sort to know what to do with that info.

The most direct way I know is use an accelerometer in the car. You want to shift so you're pulling the same G's at the bottom of 2nd as you were at the top end of 1st, and do that in each gear. Not a new idea, its in old magazine road tests back as far as the 1940s!