Thanks for the wishes for good luck, 'm sure I'll need it!
I attached a screen shot from my GoPro when I went past the speed trap on the morning run down, it was about 30 miles in just before you enter the canyons. My speedometer was just over 150, you can see the trap has me at just over 154mph. On the return run in the afternoon the added heat cost me a couple HP, so 151 was my top speed on the return.
Kurt
Quote:
Originally Posted by Idaho2018GTPremium
No, you have no idea if you think you'll go from 150 to 160 mph with only 20 more hp. It's physics, man. Power is related to speed by the cube of the speed difference. To go from 160 to 150 looks like this: (160/150)^3 = 1.214. So, you need 1.214x the power you currently have, in other words, you need 21.4% more hp. Assuming your 230 hp estimate (my 255 was just a ballpark), 21.4% = 49 more hp to hit 160 mph. So, ~280 crank hp assuming all else equal. Downhill and with a tail wind doesn't count.
Here's another example:
ZL1 top speed (official 2 way averaged runs) = 198 mph. Assume your car has a top speed of 150 mph based on your posts:
(198/150)^3 = 2.3
Your car makes 275 hp stock (comparing stock for stock) and a ZL1 is 650 hp. 275*2.3 = 633 hp. That's pretty close to 650 hp. The difference can be explained by several potential things: Accuracy of your 150 mph reading, assumed hp at that speed, the fact that the ZL1 has more rolling resistance with the wider tires, and probably slightly more drag due to the additional cooling and downforce.
You think you can get 21% closer to a ZL1's top speed with only 5% of the power deficit improvement (20 hp)? Good luck.
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