Hi everyone,

Been scouring the forum for XKR-S performance mods and wondering if I've missed some. I'm trying to put together the list of things I intend on doing to spice up my XK.

Upper pulley 60.5mm swap - Velocity AP and others.
ECU tune - Velocity AP and others.
Cooler spark plugs - NGK IFR6E11 gapped to 0.9mm
200 cell cats or cat-less - ?? Cat-less would just be custom pipework of course and some sort of O2 bypass
O2 sensors or O2 bypass - ?? I assume any tunes will address this with simulated O2 readings.
Uprated intercooler cooler - ??
Intercooler sprayer - ?? Not a very common practice but it does work in certain conditions.
Air intake - ?? Looks like the only thing out there is just K&N style filters and custom airbox jobs.
Water/Meth injection - ??
Uprated oil cooler - ?? Surprised XKR-S doesn't seem to have them.
Transmission cooler - ?? Does the XKR-S have / need one?
eDiff software retune - ?? Seems like Cambo knows the secret here.
Brakes - Wilwood pads (still tracking down their PN# for right fitment)
XKR-S GT wheels - https://www.wheelcollision.com/store...XK-XK8-XKR.htm

If there are other threads that address these questions, please let me know.

 

May be worthwhile confirming if you intend to track it ir if you want a mean lean street machine.

Yes it has a transmssion cooler, I think they all do, you may also wish to change the coolant to evens waterless if you intend to track it.

Also your brake upgrades as pads alone won't cut it, you'd need a decent racing/track tyre and decent rotors/discs like wortecs.

A decent custom intercooler will set you back £1000/1300USD.

Personally I'd leave rhe tune until after youve got the other bits done, also (dependent on mileage/use get your SC oil changed when doing the oulley)

 

Just occasional track duty but mainly a street car.
Only brake upgrades I've found are pads. Not much luck finding BBK set ups for the XKR-S. I may splurge on a set of Pilot Cup 2 tyres if I get another set of wheels specific for track day use.

 

The Cup 2s are great tyres, what I've on mine. BBK kit would be the CCs from the F-Type, frequently on eBay.

 

S/C pulleys are a waste of time and money. Hard to remove the old one and correctly align the new one. The Aluminum pulleys can cause belt slip and you end up with less boost/power than stock. Do a crank pulley and tune for real gains. Upgrade the I/C pump to something that actually moves coolant and consider splitting the I/C system, I have not seen any data that upgrading the charge cooler will make the IAT's cooler. Money would be spent better on a Killerchiller system. Sticky tires and upgraded pads will work ok for the street.Change the diff oil so it does not overheat so easily and start to judder. I added extra oil also but the diff really needs a cooler.
Have fun

 

I like this exercise. Tried similar with Dynamic R vs standard XKR.

I would add exhaust in general. ~2,5" pipes with less restrictive muffler and x-pipe.

 

Could you please elaborate on that? Which pump you have in mind?

 

Seems like the jury is out on completely freeing up the exhaust path. I’ve considered straight pipes from the Xpipe back and 200 cell cats. I’ve read some arguments that there is a loss of torque with the loss of back pressure. Coming from turbo setups, I’ve always gone with as free flowing as possible. So I’m open to opinions here.

As for BBKs, I’m not sure I want to splurge 14k+ (Per eBay) on the carbon ceramics from the F Type.
Open to other options here too. There were some privateer GT3 and GT2 versions of the XKR out there, so there must be kits that can be used.

 

I assume you mean the water pump that is apparently a known point of failure on the 5.0L SC but if there an alternative to the OEM part that is more effective?

 

Sc pulley will add power with the correct tune. Cooling mods will help prevent timing pull and provide more consistent power delivery, exhaust well not much there maybe 10hp from cats delete ..
I can do ecu reprogramming for you . If you're near LA , Mina gallery is the best place to get the pulley installed.

 

Sent from phone so harder to quote

1) I have a smaller ali pulley and am changing to SS one from powerhouse in Nov
2) I have no backbox
3) I am running K&N's

At a dyno last year I was 493, so 17 horses had escaped.

Will dyno again after tranny service, sc coupler and pulley upgrade before considering a remap.

Who's the best to use in the UK at a reasonable price?

 

I initially used a Bosch 010 pump that is almost a direct fit. Later I changed it again to a Pierburg pump with a much higher flow rate. Really splitting the system and a killerchiller is the best solution but I didn’t want to start hacking into the AC system. I am referring to the IC circuit pump and not the engine coolant pump.

 

Have you actually monitored the temperature difference between stock, bosch and Pierburg pumps? Im Running with Bosch 010 and not sure that a larger flow pump will be beneficial, can actually be counter productive i hear if flow is too fast for the heat exchanger rate.

 

After going through the x150 service manual to look at where the various coolers sit in the XKRS I’m dismayed to find that most of the coolers are buried deep in the engine packaging with no space to adjust or replace.

It would require much work and fabrication to move lines, add brackets and other attachment points for a novice mechanic as myself.

For example, the oil cooler sits in the V between the cylinder banks. Strange.
There’s an auxiliary cooler for the supercharger right in front of the engine radiator but the two charge coolers is tucked in a place where there is no apparent airflow.
I’m a little baffled by how this motor is packaged. It works for Jag but not easy for anyone else to work on.

Also, how much harmonic dampening do the air intake hoses need??

 

Yes I have, With the Bosch I saw an approximate 10% reduction in IAT and with the Pierburg I saw an average of 12% reduction but the big difference was the recovery speed, approximately 50% faster with the Pierburg. I used the smallest Pierburg CWA050 pump. Testing is obviously limited but on similar temperature days doing similar runs and cool downs, there was always an improvement. Sometimes for than 10-12% sometime less abut the average was always better. My Jaguar pump had about 30K on it so I don't know how good or bad it was during the testing and comparisons but it never showed restricted performance and I used the car for many track days typically 20-30 per race.

 

Hey Alex, unfortunately I'm in the middle of the country (Indiana). I will check on the upper pulley from Mina.
Seems like most shops have the upper pulley. Are they all about the same in terms of size reduction? Materials? Quality?

It seems like the best way for me to get a tune locally is just buy the ODB tune uploader from VelocityAP and upload the tune myself. Although has anyone used the VelocityAP tune? Any good? What is the device the use? It looks like the OpenFlashTablet that I've used on BMWs in the past.

 

Most upper pulleys that are sold are similar in size and quality from my experience but I would stay away from aluminum ones . Also installation can be a big one as it's not an easy thing to do ,I had customers come in looking for a tune with a hack job of a pulley install which had to be redone as supercharged belt kept on failing due ro improper pulley install, .
Most of my tunes are done outside of the state anyway so I mail my equipment all over. Tuning is done through OBD2 port. Pm for details

 

I have a 2012 XKR-S. This is my 5th one. 2nd S. Rest were XKR.

get tune from Eurocharged as well as the pully. You get the most gains from their tunes.

also they make a kit to replace the couplers and seals of the supercharger. It’s called a “rebuild kit” but it’s only couplers and seals. Not the snout. I gained another 16hp at wheels but replacing them.

intakes you can get on eBay. 2 K&Ns. They are installed by taking the front wheels off and pull down inner fender walls. I Gained 6hp from those

so I dynod car after each install

just with those I mentioned.

Currently I am at 648 HP to wheels & 591TQ.

and to be safe your not loosing any “stock” HP. Have your aux water pump for charger looked at, both engine fuel pumps and both engine fuel pressure sensors. If they are all good. You will have a rocket.

also rule of thumb. These cars with higher mileage over 80k. Put 0w20 high mileage full synthetic and a quart of Lucas high mileage oil additive every oil change and every 4-5 times you fill up. Throw in a Lucas high mileage fuel injector additive in the tank as well. I have 0 lag..ran a 10.2 at 1/4 and burried the Speedo numerous times..

 

Can you please post dyno sheets and time slips? Those would all be super helpful to others here looking to mod. So many times it is forgotten to document improvements made.

 

Go to Eurocharged.com and you’ll see pulley and tune. I’ll search for mine w the intakes