XKR vs XJR: 420 vs 400 hp??
#1
09-26-2020, 10:27 AM
Join Date: Jul 2012
Location: Beautiful Pilot Mountain NC
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XKR vs XJR: 420 vs 400 hp??
I'm doing the infamous Valley Hose on my '07 XJR. Also, servicing the (M112) SC and other stuff along the way. And, got to wondering: where did that extra ('07 - '09 4.2L XKR) 20 HP come from?
(My thought is dual air filter intake system; maybe freer exhaust as well?)
...still looking for a pristine XKR coupe...
(My thought is dual air filter intake system; maybe freer exhaust as well?)
...still looking for a pristine XKR coupe...
#3
09-26-2020, 03:50 PM
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#4
09-26-2020, 08:46 PM
Join Date: Jul 2012
Location: Beautiful Pilot Mountain NC
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Thanks JA
The SC XJ models X356 (late '06 - '07 in USA) and X358 ('08 - '09 USA) do use the 400HP VVT SC engine (AJ34S, I believe). Earlier X350's use the 390HP AJ33S
Didn't realize the early XKR's use more SC overdrive (larger crank pulley). Imagine they need LSD even more than the XJR does. I see you added this to your '08...
Appreciate the info!
The SC XJ models X356 (late '06 - '07 in USA) and X358 ('08 - '09 USA) do use the 400HP VVT SC engine (AJ34S, I believe). Earlier X350's use the 390HP AJ33S
Didn't realize the early XKR's use more SC overdrive (larger crank pulley). Imagine they need LSD even more than the XJR does. I see you added this to your '08...
Appreciate the info!
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