XKR 10% overdriven pulley - no difference?
#1
XKR 10% overdriven pulley - no difference?
Hi Guys
I recently fitted a good quality 10% overdriven pulley to my 2003 XKR. The engine is in good health. No codes thrown. Thing is I can't feel any difference whatsoever.
I've had a number of high hp cars and seat of the pants dyno is pretty good from years of drag racing. Any ideas on why I wouldn't be getting any benefit.
Any ideas greatly appreciated .
Cheers Jeff
I recently fitted a good quality 10% overdriven pulley to my 2003 XKR. The engine is in good health. No codes thrown. Thing is I can't feel any difference whatsoever.
I've had a number of high hp cars and seat of the pants dyno is pretty good from years of drag racing. Any ideas on why I wouldn't be getting any benefit.
Any ideas greatly appreciated .
Cheers Jeff
#2
Hi Guys
I recently fitted a good quality 10% overdriven pulley to my 2003 XKR. The engine is in good health. No codes thrown. Thing is I can't feel any difference whatsoever.
I've had a number of high hp cars and seat of the pants dyno is pretty good from years of drag racing. Any ideas on why I wouldn't be getting any benefit.
Any ideas greatly appreciated .
Cheers Jeff
I recently fitted a good quality 10% overdriven pulley to my 2003 XKR. The engine is in good health. No codes thrown. Thing is I can't feel any difference whatsoever.
I've had a number of high hp cars and seat of the pants dyno is pretty good from years of drag racing. Any ideas on why I wouldn't be getting any benefit.
Any ideas greatly appreciated .
Cheers Jeff
l changed my crank pulley recently and difference is very noticeable.
#4
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knowsnot (02-28-2021)
#7
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#8
#9
If you haven't already clean the MAF and check throttle cable adjustment. Those two items make quite a bit of difference.
#12
#13
Jeff and the Supercharger Pulley!!
Jeff390,
By the seat of your pants, You will not feel any difference with a smaller pulley on the S/C! There may be a little on a dyno but not enough to go to all the trouble of putting it on...….The one advantage of having it on there now is that you won't have to put it on again when you finally decide to go for the large lower Pulley...…..That's when you will feel the difference.... ! Guaranteed...…
Billy Clyde in Houston
By the seat of your pants, You will not feel any difference with a smaller pulley on the S/C! There may be a little on a dyno but not enough to go to all the trouble of putting it on...….The one advantage of having it on there now is that you won't have to put it on again when you finally decide to go for the large lower Pulley...…..That's when you will feel the difference.... ! Guaranteed...…
Billy Clyde in Houston
#14
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bcprice36 (07-31-2018)
#15
If a 2003 is similar as my 2008 xkr Any change in intake or exhaust is accounted for and included in factory programing.
There is an exact map with supercharger pulley size in the programing that I had to change when upgraded my pulley, Same applies for any exhaust modification, there is map written for exact backpressure. I can tell you guys that with mods and no tune and mods and a tune is a night and day difference , as if extra 100lb of torque was added
There is an exact map with supercharger pulley size in the programing that I had to change when upgraded my pulley, Same applies for any exhaust modification, there is map written for exact backpressure. I can tell you guys that with mods and no tune and mods and a tune is a night and day difference , as if extra 100lb of torque was added
__________________
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 111.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 Supercharged, (stock with Alpha Jag ECU tune), estimated power: 600+ hp, 7.7sec 1.8th mi/95mph
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 111.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 Supercharged, (stock with Alpha Jag ECU tune), estimated power: 600+ hp, 7.7sec 1.8th mi/95mph
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Johnken (07-31-2018)
#16
#17
#18
Hi Guys
I recently fitted a good quality 10% overdriven pulley to my 2003 XKR. The engine is in good health. No codes thrown. Thing is I can't feel any difference whatsoever.
I've had a number of high hp cars and seat of the pants dyno is pretty good from years of drag racing. Any ideas on why I wouldn't be getting any benefit.
Any ideas greatly appreciated .
Cheers Jeff
I recently fitted a good quality 10% overdriven pulley to my 2003 XKR. The engine is in good health. No codes thrown. Thing is I can't feel any difference whatsoever.
I've had a number of high hp cars and seat of the pants dyno is pretty good from years of drag racing. Any ideas on why I wouldn't be getting any benefit.
Any ideas greatly appreciated .
Cheers Jeff
Personally I would try the following. If its the original MAF change it. Dead easy to do. Takes 2 or 3 mins tops. Fuel filter if its been on there a while change it. Air filter same. While we are on the subject ...... Open up the air filter box, just flip the clips with a screw driver. Remove the paper air filter. Take a look inside. On the edge that is closest to the engine you will see a spring loaded flap, side mounted. Ensure that is free to move and is not stuck open or closed, normal position is closed. When you put your foot down, know as WOT (Wide Open Throttle) the engine management senses this and opens that flap to let more air in. If it cannot open you get less air therefore less power. Id spray it with WD40 to free it then grease it or oil it to ensure it stays free.
If you need a 'how to' on any of the above just ask and I will send you a link. Personally id try the MAF change first, there are non Jaguar MAF sensors which are much cheaper and are exactly the same.
Here you go. Take a read https://www.jaguarforum.com/showthre...l=1#post780676 and https://www.jaguarforum.com/showthre...l=1#post940168
#19
#20
Jeff420
Thanks Frank. I've had the MAF out twice and cleaned it with CRC MAF cleaner. I replaced the air filter element with a K&N one. Also replaced the fuel filter. Will now start looking into fuelling to make sure it's not being starved at any point.
appreciate your feedback .
appreciate your feedback .
You will never get the feeling you are looking for with just the smaller upper Pulley......It's just not there! You need to go to Eurotoys.com in Chicago. Get their $995.00 Crank Pulley Kit, which gives you everything you need to increase your boost enough for you to get what you are looking for..."Torque" buy that Kit and also get the large Intercooler radiator and the large Water Pump, while you are at it......Then get a Snow Methional/Water injector system (Stage 2) with the VC-50 Controller....This will keep the system Cool, increase you HP & Torque and make you a happy Guy! Guaranteed! Rather than having 390 after your name, you will have to change it to about 430 or so!
Billy Clyde in Houston
Last edited by bcprice36; 08-04-2018 at 11:51 AM.
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Eurotoys (08-05-2018)
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