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XK / XKR ( X150 ) 2006 - 2014

Quest for 425 HP

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Old Dec 15, 2022 | 02:22 PM
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Originally Posted by ralphwg
I owned a 2012 XK vert which I had tuned and installed a Mina Galleries exhaust. See attached PDF. About 440 BHP at the rear wheels.
hmm. bhp is brake horsepwer or crank power.

You seem to make roughly 335rwhp. at a 20% loss, you're looking at 420crank hp, which isn't bad
 
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Old Dec 15, 2022 | 05:26 PM
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I found the transmission loss to be around 10% on my '10 XKR when I was getting it tuned.
 
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Old Dec 15, 2022 | 08:12 PM
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Originally Posted by u102768
I found the transmission loss to be around 10% on my '10 XKR when I was getting it tuned.
How did you make that conclusion?
 
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Old Dec 16, 2022 | 06:27 PM
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By working out what the percentage difference was between the RWHP from the dyno and factory crank HP.
 
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Old Dec 19, 2022 | 04:23 AM
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With the 4.2 R on a DynoJet, I found about a 16% difference between BHP and WHP.
 
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