Rocket speed / RPM

I think your out a bit it should be 80.2 mph with new tire and 79.8 is with a 90% worn tire also tire pressure would affect it as well
I only use .0266 as a constant not .0266733333333 its just general math like the speedo is only good until I shift from third to fourth then there is no more numbers anyway. I use a GPS to monitor my speed its easier when your paying attention to more important gauges and the road in front of you Just like its easier to use the hud display so you have less things in your way and can monitor the A/F ratios and boost pressure and temps. these are the things I wory about you can always go back and check the GPS max speed indicator to see how fast you went. I also use recommended tire pressures and figure some centrifugal expansion of the tire does happen. Also it depend on what rim I am using as the 240/40/18 stands taller then the 24/50/16 the 55 is a little closer to the 18 inch diameter.

In the Warp zone safety is more important then the speedo reading :D
 
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