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      11-11-2023, 09:49 AM   #33
ebirotedu
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Drives: 2022 BMW Z4 M40i
Join Date: Mar 2022
Location: NH

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Yeah, peak HP can be used as a proxy for such things, but it's only a proxy.

Personally, I'm convinced that the B58 makes more than 400 HP, but not that it makes 450. But maybe it does.

Dinan has plenty of incentive to use a dyno that reads high considering that there's a marketing advantage to quoting the highest post-Dinan mod HP number they can.

Ultimately, whether we agree that the US spec M40i really makes 420 hp or 450, it won't make our cars any faster or slower.



Quote:
Originally Posted by MisanoblueZ4 View Post
Trap speeds of 116mph in the 1/4 is certainly showing well over 400hp crank. Nearly 450ish is believable, this is a 3500lb car with less tire then a C7 Corvette and the Trap speeds are not far off.


Here is a 2017 Grand Sport test by C&D, 3.9 0-60 12.3@116 quarter mile

https://www.caranddriver.com/reviews...t-reliability/
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