XJ XJ8 / XJR ( X308 ) 1997 - 2003

Anyone do performance upgrades to the engine?

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Old Oct 3, 2016 | 05:13 PM
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Question Anyone do performance upgrades to the engine?

Just curious, has anyone tried to upgrade performance of their engine in any way?

(And swapping to a K&N air filter does not count, it upgrades performance as much as a stick-on hood scoop, lol.)
 
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Old Oct 3, 2016 | 05:30 PM
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Originally Posted by vdpnyc
Just curious, has anyone tried to upgrade performance of their engine in any way?

(And swapping to a K&N air filter does not count, it upgrades performance as much as a stick-on hood scoop, lol.)
Yep those K&N's are a waste of money, is your VDP supercharged or N/A?
If its a supercharged than try those s/c pulleys.
 
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Old Oct 3, 2016 | 06:26 PM
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I run a K&N filter insert. I'm running a large lower pulley and small upper pulley with remapped ECU, I'm not going to try and suck air through the stock paper filter if I can help it. Also up rated to a higher GPM flow pump (Merc vice hella) on the intercooler recirc to help increase flow and help with heat soak on the aircharge coolers.
 
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Old Oct 4, 2016 | 05:04 PM
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Originally Posted by omgimali
Yep those K&N's are a waste of money, is your VDP supercharged or N/A?
If its a supercharged than try those s/c pulleys.
N/A
 
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Old Oct 4, 2016 | 05:17 PM
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Weight reduction...
 
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Old Oct 5, 2016 | 09:37 AM
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Originally Posted by omgimali
Weight reduction...
You, or the car? Or a divorce?
 
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Old Oct 5, 2016 | 03:28 PM
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Originally Posted by vdpnyc
You, or the car? Or a divorce?
Haha no, remove stuff like the full size spare tire. But performance upgrades idk
 
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Old Oct 5, 2016 | 04:30 PM
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There's not a whole lot you can do, especially on the NA. You're limited to smoothing out the intake, free-er flowing filter (all the little gains add up to something eventually), and trying to free up exhaust too, however that's going to be trial and error to find a balance that gains and not just changes the sound. These aren't engines that you can just swap heads and a cam, or bore .030 over and away you go like a small block Chevy. You might be able to experiment with an underdrive crank pulley like the SC uses, and find a belt, that might help a little? Other than that though, your only other advice to make the car faster, is what was said. Losing weight where you can. But then you also lose comfort (as in , changing for lighter seats, losing sound deadening, etc). So it all comes down to what you're aiming for. But for an NA car, there's not much in the way of engine upgrades that will gain you much at all. I haven't looked, but I'd say you're going to be really fighting to gain I dunno, 20-30 hp or so with everything combined?
 
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Old Oct 6, 2016 | 01:48 AM
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Biggest and cheapest is sell NA and buy SC car. Anything else will cost $$$ and achieve roughly nil.
 
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Old Oct 6, 2016 | 04:04 AM
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How about Cosworth cams?
 
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Old Oct 6, 2016 | 02:53 PM
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Originally Posted by JagV8
Biggest and cheapest is sell NA and buy SC car. Anything else will cost $$$ and achieve roughly nil.
I'm a vdp guy, to find a superV8 is no easy task.
 
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Old Oct 6, 2016 | 05:40 PM
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Originally Posted by Mark Murphy
How about Cosworth cams?
from where?
 
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