Performance modifications
#1
Performance modifications
I have done every performance mod to my 2015 xkr convertible.
1. Tune and pulley
2. 200 cell cats full racing exhaust
3. Hi flow air filters
4. Car has been lowered
5. 305/30/20 pilot super sport rear
6. 265/35/20 pilot super sport front
7. New wheels that are forged and lighter.
Anyone know of any other modifications including engine work? Wanting straight line performance.
1. Tune and pulley
2. 200 cell cats full racing exhaust
3. Hi flow air filters
4. Car has been lowered
5. 305/30/20 pilot super sport rear
6. 265/35/20 pilot super sport front
7. New wheels that are forged and lighter.
Anyone know of any other modifications including engine work? Wanting straight line performance.
#2
#3
#5
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dan314 (04-14-2017)
#6
An overlooked mod (I think) is boring out the throttle body. It is most effective with "suck through" intakes like your Jaguar, as compared to "blow through". Maxbore.com throttle body boring service and repair is the man to do this. Made a noticeable, but minor difference on my '07 XK (N/A).
Anything you do to materially cool intake air temp is very beneficial. Do research aftermarket intercoolers. You will probably have to do your own research - don't expect someone to offer you a "kit", but if they do it will be very expensive.
Nitrous is a great mod for the street - it is cheap and unobtrusive. It is there when you want it (keep the bottle full); and produces a wide powerband.
Anything you do to materially cool intake air temp is very beneficial. Do research aftermarket intercoolers. You will probably have to do your own research - don't expect someone to offer you a "kit", but if they do it will be very expensive.
Nitrous is a great mod for the street - it is cheap and unobtrusive. It is there when you want it (keep the bottle full); and produces a wide powerband.
#7
Unfortunately Cee Jay had a very bad experience with his tires. I have had almost every brand of tire including multiple Michelins and so far the PSS has been the stickiest for the money and I have had no issues with them. Since he had those defective tires, there have been reformulations.
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#8
An overlooked mod (I think) is boring out the throttle body. It is most effective with "suck through" intakes like your Jaguar, as compared to "blow through". Maxbore.com throttle body boring service and repair is the man to do this. Made a noticeable, but minor difference on my '07 XK (N/A).
Anything you do to materially cool intake air temp is very beneficial. Do research aftermarket intercoolers. You will probably have to do your own research - don't expect someone to offer you a "kit", but if they do it will be very expensive.
Nitrous is a great mod for the street - it is cheap and unobtrusive. It is there when you want it (keep the bottle full); and produces a wide powerband.
Anything you do to materially cool intake air temp is very beneficial. Do research aftermarket intercoolers. You will probably have to do your own research - don't expect someone to offer you a "kit", but if they do it will be very expensive.
Nitrous is a great mod for the street - it is cheap and unobtrusive. It is there when you want it (keep the bottle full); and produces a wide powerband.
#9
#10
I have done every performance mod to my 2015 xkr convertible.
1. Tune and pulley
2. 200 cell cats full racing exhaust
3. Hi flow air filters
4. Car has been lowered
5. 305/30/20 pilot super sport rear
6. 265/35/20 pilot super sport front
7. New wheels that are forged and lighter.
Anyone know of any other modifications including engine work? Wanting straight line performance.
1. Tune and pulley
2. 200 cell cats full racing exhaust
3. Hi flow air filters
4. Car has been lowered
5. 305/30/20 pilot super sport rear
6. 265/35/20 pilot super sport front
7. New wheels that are forged and lighter.
Anyone know of any other modifications including engine work? Wanting straight line performance.
#11
We have that here too, power gain is a bit higher than that but because the specific gravity is different from gasoline, you would need larger injectors and a more powerful pump plus a PCM map to account for fueling, etc.
#12
Join Date: Jan 2015
Location: Naperville, Illinois USA
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A little plastic box, weighs probably less than a pound, but man does it perform!
If you're concerned about the weight, just skip the burrito before track time.
#13
#14
Unfortunately Cee Jay had a very bad experience with his tires. I have had almost every brand of tire including multiple Michelins and so far the PSS has been the stickiest for the money and I have had no issues with them. Since he had those defective tires, there have been reformulations.
The following users liked this post:
jahummer (01-27-2017)
#15
Steve K - Answer to my experience with bored throttle body. The bore of my stock throttle body is 82 mm. Www.maxbore. com did the boring to 85 mm. Cost now is $125 and MaxBore turn around is about 24 hrs.
Larger throttle bodies are an easy hp gain. I wonder if Jaguar/anyone has produced a larger bore throttle body that will interchange with ours?
Had a '05 Cadillac CTS-V with stock 75 (aprox) mm throttle body. Went to a 90 mm aftermarket from TPIS, but this required also a new manifold mount. OEM manifold is a plastic compound, and new mount was glued onto manifold. I think Jaguars would be more complicated.
Larger throttle bodies are an easy hp gain. I wonder if Jaguar/anyone has produced a larger bore throttle body that will interchange with ours?
Had a '05 Cadillac CTS-V with stock 75 (aprox) mm throttle body. Went to a 90 mm aftermarket from TPIS, but this required also a new manifold mount. OEM manifold is a plastic compound, and new mount was glued onto manifold. I think Jaguars would be more complicated.
#18
Originally Posted by Rey
Steve K - Answer to my experience with bored throttle body. The bore of my stock throttle body is 82 mm. Www.maxbore. com did the boring to 85 mm. Cost now is $125 and MaxBore turn around is about 24 hrs.
Larger throttle bodies are an easy hp gain. I wonder if Jaguar/anyone has produced a larger bore throttle body that will interchange with ours?
Had a '05 Cadillac CTS-V with stock 75 (aprox) mm throttle body. Went to a 90 mm aftermarket from TPIS, but this required also a new manifold mount. OEM manifold is a plastic compound, and new mount was glued onto manifold. I think Jaguars would be more complicated.
Larger throttle bodies are an easy hp gain. I wonder if Jaguar/anyone has produced a larger bore throttle body that will interchange with ours?
Had a '05 Cadillac CTS-V with stock 75 (aprox) mm throttle body. Went to a 90 mm aftermarket from TPIS, but this required also a new manifold mount. OEM manifold is a plastic compound, and new mount was glued onto manifold. I think Jaguars would be more complicated.
If you have an ODB11 scanner you can take the maf lb/min reading to determine whether your mod has increased airflow
Last edited by steve_k_xk; 01-27-2017 at 02:42 PM.
#19
Steve, no testing before/after throttle body boring. My Jaguar is the n/a base model. I was interested in a bit more top end power for high altitude driving, with no driveability/gas mileage loss.
The electronic throttle body control acts much like a constant velocity carburetor, so there is no bogging at low rpm/high throttle opening with a larger bore. You can easily "do the math" to measure overall throttle plate area before and after. Bore area will only tell the absolute maximum potential airflow. Read somewhere (cannot find the quote) that "suck through" throttle body supercharged motors like Jaguar are much more responsive to throttle body bore size than "blow through", like Paxton.
The electronic throttle body control acts much like a constant velocity carburetor, so there is no bogging at low rpm/high throttle opening with a larger bore. You can easily "do the math" to measure overall throttle plate area before and after. Bore area will only tell the absolute maximum potential airflow. Read somewhere (cannot find the quote) that "suck through" throttle body supercharged motors like Jaguar are much more responsive to throttle body bore size than "blow through", like Paxton.
#20