Just curious about -the fastest xk5.0 non supercharge
#1
Just curious about -the fastest xk5.0 non supercharge
I was very curious the xk 5.0 non-supercharge
1/ how fast and how many hp?
2/ what mods done to achieve that
3/ any special advise or pointers in regards to the mods
i know most of the people in the form saids the same thing " dont waste time and get an xkr" but i am sure there are a fair number of us that would be curious what the limit is with the xk.
Thanks
1/ how fast and how many hp?
2/ what mods done to achieve that
3/ any special advise or pointers in regards to the mods
i know most of the people in the form saids the same thing " dont waste time and get an xkr" but i am sure there are a fair number of us that would be curious what the limit is with the xk.
Thanks
#2
Only thing I've ever seen is xf 5.0 on YouTube running 13.9/14
I've got the 4.2 the quickest time iv posted is 13.72 (cats, tune, x-pipe)
Haven't had a proper chance to go back down after the diff ratio change and enlarged throttle . Thinking the best would be a 13.5
Surely with similar mods excluding the diff ratio swap the 5.0 would have to be in the low 13s
I've got the 4.2 the quickest time iv posted is 13.72 (cats, tune, x-pipe)
Haven't had a proper chance to go back down after the diff ratio change and enlarged throttle . Thinking the best would be a 13.5
Surely with similar mods excluding the diff ratio swap the 5.0 would have to be in the low 13s
Last edited by steve_k_xk; 12-25-2018 at 09:59 PM.
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DENNIS LEE (12-26-2018)
#3
Only thing I've ever seen is xf 5.0 on YouTube running 13.9/14
I've got the 4.2 the quickest time iv posted is 13.72 (cats, tune, x-pipe)
Haven't had a proper chance to go back down after the diff ratio change and enlarged throttle . Thinking the best would be a 13.5
Surely with similar mods excluding the diff ratio swap the 5.0 would have to be in the low 13s
I've got the 4.2 the quickest time iv posted is 13.72 (cats, tune, x-pipe)
Haven't had a proper chance to go back down after the diff ratio change and enlarged throttle . Thinking the best would be a 13.5
Surely with similar mods excluding the diff ratio swap the 5.0 would have to be in the low 13s
#4
Dennis, I think that most don't buy a standard XK for the outright performance, it is just a well balanced and powerful GT cruiser.
Those interested in outright performance, and the ensuing figures will be steered toward the XKR.
By way of example I had a 4l X100 and only twice (in 14yrs) had it dyno'd before/after some performance mods, I was more concerned about economy (?) which I got up to 60mpg in ££ monetary terms (50mpg in $$'s)
I've had my XKR dyno'd 3 times in less than 3 months and couldn't care less about economy (thankfully)!
Those interested in outright performance, and the ensuing figures will be steered toward the XKR.
By way of example I had a 4l X100 and only twice (in 14yrs) had it dyno'd before/after some performance mods, I was more concerned about economy (?) which I got up to 60mpg in ££ monetary terms (50mpg in $$'s)
I've had my XKR dyno'd 3 times in less than 3 months and couldn't care less about economy (thankfully)!
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DENNIS LEE (12-26-2018)
#5
I do understand and agree with your logic. Yet I was again just curious thinking there must be somebody out there that would mod an XK to its capacity and I was wondering what that would be in addition to the way they accomplished it. I think that would be a fair enough question to ask even knowing that those that probably into higher performance would likely get into an Xkr.
#6
I do understand and agree with your logic. Yet I was again just curious thinking there must be somebody out there that would mod an XK to its capacity and I was wondering what that would be in addition to the way they accomplished it. I think that would be a fair enough question to ask even knowing that those that probably into higher performance would likely get into an Xkr.
#7
You're going to have the same problem with a 5.0L XK as everyone else had with the 5.0L XKR, until recently nobody was really able to tune them properly.
Plenty of examples here on the forum of people who through lots of dollars at tuning companies and got no real results (i'm talking about the X150 with Denso ECU, it's a different story with the newer models that run Bosch). But there are a few Denso cars putting down good numbers at the track, where it counts. They all have one thing in common...
In any case, to get the most out of a naturally aspirated motor, you need to make it breath better, that means a highly efficient exhaust, and efficient intake.
The N/A motor already has a similar dual-intake as the S/C, so I wouldn't be too worried about it being restrictive. You might want to look at a custom intake to get rid of all the resonators and what-not, but to be honest I don't think there's too much to be had there.
On the exhaust side, and XKR-S style centre section with x-pipe, and some high-flow cats, will be a must.
Nobody is making headers for these cars/motors, and even if they did they would probably make them wrong anyhow.
Exhaust, cats, and a proper tune, you will get more grunt out of the 5.0L XK, but anyone who promises you big numbers is going to be full of it... I really don't know how much power JLR left on the table with the naturally aspirated 5.0L, there will be some, but don't have your expectations set too high...
Plenty of examples here on the forum of people who through lots of dollars at tuning companies and got no real results (i'm talking about the X150 with Denso ECU, it's a different story with the newer models that run Bosch). But there are a few Denso cars putting down good numbers at the track, where it counts. They all have one thing in common...
In any case, to get the most out of a naturally aspirated motor, you need to make it breath better, that means a highly efficient exhaust, and efficient intake.
The N/A motor already has a similar dual-intake as the S/C, so I wouldn't be too worried about it being restrictive. You might want to look at a custom intake to get rid of all the resonators and what-not, but to be honest I don't think there's too much to be had there.
On the exhaust side, and XKR-S style centre section with x-pipe, and some high-flow cats, will be a must.
Nobody is making headers for these cars/motors, and even if they did they would probably make them wrong anyhow.
Exhaust, cats, and a proper tune, you will get more grunt out of the 5.0L XK, but anyone who promises you big numbers is going to be full of it... I really don't know how much power JLR left on the table with the naturally aspirated 5.0L, there will be some, but don't have your expectations set too high...
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NBCat (12-27-2018)
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MarkyUK (12-27-2018)
#10
Find it strange in the respect of people buy certain performance vehicles like wrx, s5, V8 vantage, S3 knowing all to well there is a higher performance model in that brand ..this doesn't seem to be the case with the xk for those who want performance they go straight to the xkr.
In 2010 when I'd ditched SWMBO I set about with performance mods
So then set about:
Performance straight through zausts
Cat bypasses
Carbon dynamics air intake
Terraclean
Royal purple fully synth
larger cleaned and calibrated injectors
Reprofiled cam's
Performance manifolds made by hayward and scott
Took a humble 290 bhp up to 340 (Dyno'd at Noble's in Leics) as was led to believe that the tranny wouldn't take much more
Standard tune, and YES the 15% hike in power could have been gotten much cheaper by buying an XKR to start....it was just the joy of modding and loving the car you own
Hope this clarifies things?
#11
#12
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I was very curious the xk 5.0 non-supercharge
1/ how fast and how many hp?
2/ what mods done to achieve that
3/ any special advise or pointers in regards to the mods
i know most of the people in the form saids the same thing " dont waste time and get an xkr" but i am sure there are a fair number of us that would be curious what the limit is with the xk.
Thanks
1/ how fast and how many hp?
2/ what mods done to achieve that
3/ any special advise or pointers in regards to the mods
i know most of the people in the form saids the same thing " dont waste time and get an xkr" but i am sure there are a fair number of us that would be curious what the limit is with the xk.
Thanks
If you're wanting to improve the performance of the vehicle through corners, suspension and tyre changes are the first step before touching the engine.
If you plan on operating the vehicle on public roads in California, any engine modifications that aren't CARB certified will cause the vehicle to fail a smog test.
#13
I have to give the original poster some originality points.
The idea of tuning a 5.0L XK had never even occurred to me.
Perhaps the first thing I would want if doing so would be a LSD
But then, the price between a 5.0L XK, and the cost of upgrading a 5.0L XK added together surely must be more than beginning with a stock 5.0L XKR that already has an electronic diff.
The idea of tuning a 5.0L XK had never even occurred to me.
Perhaps the first thing I would want if doing so would be a LSD
But then, the price between a 5.0L XK, and the cost of upgrading a 5.0L XK added together surely must be more than beginning with a stock 5.0L XKR that already has an electronic diff.
#14
#15
Sorry I hadn't responded to my original post questions till now because of the holiday seasons. I want to firstly thanks to all the valuable comments and advice to my curiosity. To answer what some of the questions on the post, I feel that even without the SC like the XKR, the XK is by no means a low-performance car with 385 hp. Therefore I feel that If the hp can somehow bump up to anyway around 450 plus, its performance potential wouldn't be so far compared with a stock xkr per say. I think that from this thread; we can already see that with a few simple reasonable mod that we can well achieve this goal.
I.E.
- Better air Filter ( About 2 to 3 hp gain)
- Ecu Tune ( about 30hp gain)
- Exhaust mod with xpipe and resonator, muffler and possibly cat delete/ 200 cell cats installed ( about 20 HP gain or more )
We are already at about 51 to 54 hp gain without even touching intakes or ,,,,,,,, That put us to around 440, not including the subtracting the weight off the car in the removal of the muffler which must be at least weights 50 to 60 pounds which can only be a gain to the acceleration and even overall speed band on the performance. The last thing is that after talking to Paramount, they told me that they have a water methanol injection kit for the XK that can increase about 30hp For around $500us.If that is the case then we are looking at another 30hp gain which will total the hp gain to around 80 to 85 and now we looking at the hp gain close to 470 which is closing in on the gap between a stock xkr with not a huge amount of money spent.
Please let me know the above speculation are realistic and my speculations have any merits.
Cheers.
I.E.
- Better air Filter ( About 2 to 3 hp gain)
- Ecu Tune ( about 30hp gain)
- Exhaust mod with xpipe and resonator, muffler and possibly cat delete/ 200 cell cats installed ( about 20 HP gain or more )
We are already at about 51 to 54 hp gain without even touching intakes or ,,,,,,,, That put us to around 440, not including the subtracting the weight off the car in the removal of the muffler which must be at least weights 50 to 60 pounds which can only be a gain to the acceleration and even overall speed band on the performance. The last thing is that after talking to Paramount, they told me that they have a water methanol injection kit for the XK that can increase about 30hp For around $500us.If that is the case then we are looking at another 30hp gain which will total the hp gain to around 80 to 85 and now we looking at the hp gain close to 470 which is closing in on the gap between a stock xkr with not a huge amount of money spent.
Please let me know the above speculation are realistic and my speculations have any merits.
Cheers.
Last edited by DENNIS LEE; 12-31-2018 at 03:14 AM.
#16
Never heard of methanol injection on a n/a vehicle also forget about dropping 60-80lbs with the muffler delete realistically stick to ecu, X pipe and 100/200 cell cats .
LSD would also be handy at putting the power down I'm still thinking a very low 13 would be on the cards with 50-60hp possibly gained.
LSD would also be handy at putting the power down I'm still thinking a very low 13 would be on the cards with 50-60hp possibly gained.
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MarkyUK (12-31-2018)
#17
I have had extensive discussions with the R&D department manager over at Paramount who specializes with jaguar modifications. He has informed me that they had come up with a water methanol injection kit for the F-type yet also fits the XK (XK 150). It runs about US $500.00 and an hp gain of around 30.
I also have a question in regards to the exhaust. Currently, I have an Xpipe muffler in the middle section of the car with muffler and resonator deleted. I am very happy of the way it sounds and the levels are perfect.
My Question is How much difference in power gain and noise factor does switching to a 200 cell cat
How much difference if I do a cat delete again in regards to hp gain and noise level factor
Thanks, again with all your advise and valuable;e info.
I also have a question in regards to the exhaust. Currently, I have an Xpipe muffler in the middle section of the car with muffler and resonator deleted. I am very happy of the way it sounds and the levels are perfect.
My Question is How much difference in power gain and noise factor does switching to a 200 cell cat
How much difference if I do a cat delete again in regards to hp gain and noise level factor
Thanks, again with all your advise and valuable;e info.