Please don't tell me to buy an XKR 1st off! N/A 5.0... Can it be done? What will it take?

 

The NA 5.0L makes 370HP. I suspect that another 55HP is possible without forced induction, but street driveability will suffer since you'll have to increase RPMs and sacrifice low-end torque to get there. A tune by itself isn't enough.

Just because it's possible doesn't mean that it makes sense.

P.S. I stand corrected, viper1996 is right. See below. The 5.0L NA makes 385HP, not 370. My 2013 XJ 5.0LSC makes 470HP. I still doubt that the NA 5.0L can make another 40HP with only a pulley and tune.

 

They make 385 from everywhere I have read

 

bhp vs hp? or …

 

Youve got cam phasing and variable length runners within your inlet manifold so you'll get the best off both worlds in regards to long runners / lower duration camshaft profile on low rpm to benefit torque and short runners / high duration camshaft on high rpm to benefit horsepower.

You'll definitely need a tune and the only way I can see you getting up near the 440/450hp mark is with some decent headers .

Nevertheless in the mean time id be going x-pipe , higher flowing cats and proper tune but as stated before to get the most benefit definitely headers ...contact Stuart at velocity I'm pretty sure he was working or might even have headers for 5l f types (same exhaust ports s/c & n/a

 

VAP gave up on headers for the 5l F-Type some time ago, not enough space and zero power/torque increase.
Maybe more space in the X150 but doubtful VAP are looking into it, again minimal if any increase in power/torque and likely too little demand to be cost effective.

 

That was on the forced induction variety (s/C) however on n/a it'd be a different story with the increased scavenger effect, longer duration /higher lift camshaft profile & shorter intake runners
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In other words, it's just plain dumb to try to make more power from an N/A because it'll be more expensive, less durable and make a mess of things compared to getting an /R. Have you tried to locate even STOCK parts for these things? Aftermarket is a big black hole of nothingness.

 

That's for sure...I was thinking a tune and 200 cell cats may yield 40 hp???

 

200 cell cats, besides being very obnoxious to everyone's ears, will only do so much for exhaust flow as the rest is a bit restrictive. Add the fact that More Exhaust Flow needs More Intake Flow. Where will that come from? A GOOD tune can work some of that, but would have to be custom. Where would you get it? Nobody (oh, wait, I was right... Nobody) does absolute custom tunes on a dyno for XKs.
$3000 for cats, $3000 for a good exhaust, what, maybe $3000 for a tune and you MAY get that extra 40 hp? That's not money well spent.

 

Buy an XKR

 

(See what I did there?)

 

exhaust and a tune will get you to 420hp+

Stock Jaguar XK Remap dyno at Quantum HQ Stock - 388 HP | 516 NM Tuned - 412 HP | 541 NM

 

Yep, for about ten grand.
An XKR upgrade costs about that much, and is 510 hp.
It's always the same story....... get an XKR.

 

the other option is run 2 maps, 1 for high octane, 1 for pump gas.

 

I catch your drift Ceejay! XKR 2012 and up are hard to find in my area CT...Then selling mine is a PITA...Seems like most examples are being held by overpriced dealerships...

 

I don't understand how they are doing RWHP Dyno and coming up with BHP horsepower numbers...What are RWHP numbers?

 

Valid point, I got remote tuned by Quantum but
have not dynod yet so can't prove anything
other than improved drivability w my exhaust

 

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.

 

Another thing........ going /R you can easily in about ten minutes load your own tune for 550 hp and zero dollars, if you can find an SDD computer. You'll also need an X-pipe where the resonators are though.
What's that song line....... 'don't go chasing waterfalls' or something like that.