2002 XKR What Power & Speed to Expect @ 79k mi.
#22
Hello,
I just purchased a 06 XKR victory edition coupe and have some performance issues too. Here are my observations.
If you are going to get the maximum performance you must hit it from a dead stop. If you launch in first gear it will be significantly quicker. In my car if I let it reach operating temperature it is a dog compared to having a go with a coolant temperature around 140 - 160 degrees. I believe this is due to , no heat soak and a richer mixture in open loop.
I have noticed that the transmission doesn't kick down like I think it should. (perhaps I have a faulty switch) does anyone else have this issue?
with the torque app you will see an immediate temperature rise after flogging it a bit.
I haven't checked the coolant temperature on my XKR but I changed the thermostat on my XJR and it runs at 190 and generally it seems quicker than the XKR, except in open loop.
I think the earlier advise is good:
clean the MAF
check fuel trims
check supercharger coolant / pump
I haven't checked whether the torque app can monitor intake air temp. it will be interesting to see what kind of difference there is between open loop and closed loop.
I think methanol injection would be great, but the Eaton blowers are not meant to be run wet.
Cool intake air temps are worth HP which is why Member Avos's twin screw kit
boosts the HP so much. The twin screw doesn't heat the air like a roots blower does.
I just purchased a 06 XKR victory edition coupe and have some performance issues too. Here are my observations.
If you are going to get the maximum performance you must hit it from a dead stop. If you launch in first gear it will be significantly quicker. In my car if I let it reach operating temperature it is a dog compared to having a go with a coolant temperature around 140 - 160 degrees. I believe this is due to , no heat soak and a richer mixture in open loop.
I have noticed that the transmission doesn't kick down like I think it should. (perhaps I have a faulty switch) does anyone else have this issue?
with the torque app you will see an immediate temperature rise after flogging it a bit.
I haven't checked the coolant temperature on my XKR but I changed the thermostat on my XJR and it runs at 190 and generally it seems quicker than the XKR, except in open loop.
I think the earlier advise is good:
clean the MAF
check fuel trims
check supercharger coolant / pump
I haven't checked whether the torque app can monitor intake air temp. it will be interesting to see what kind of difference there is between open loop and closed loop.
I think methanol injection would be great, but the Eaton blowers are not meant to be run wet.
Cool intake air temps are worth HP which is why Member Avos's twin screw kit
boosts the HP so much. The twin screw doesn't heat the air like a roots blower does.
#23
#24
#25
I got my "new" 2002 XKR home and brought all maintenance & repairs up to date, including new O2 sensors and fuel pump relays. I won't be driving it like a hot rod, but I did want to get a benchmark of its capabilities (and find out what the legendary thrill is like) so I tested its 0-60, quarter mile and HP.
I connected an OBD2 bluetooth and loaded the Torque app on my phone. I CANNOT be disappointed by this car, but I was a bit surprised that the recorded stats were 0-60 in 6.2 sec @ 98 mph, quarter in 14.8 sec, and max HP at 230.
Is that what I should expect at 79,000 miles using this app, or should I be concerned? The supercharger doesn't sound nearly as shrill and noticable as most of the others we drove in our quest.
Thanks for humoring a new and still-grinning owner.
I connected an OBD2 bluetooth and loaded the Torque app on my phone. I CANNOT be disappointed by this car, but I was a bit surprised that the recorded stats were 0-60 in 6.2 sec @ 98 mph, quarter in 14.8 sec, and max HP at 230.
Is that what I should expect at 79,000 miles using this app, or should I be concerned? The supercharger doesn't sound nearly as shrill and noticable as most of the others we drove in our quest.
Thanks for humoring a new and still-grinning owner.
#26
#27
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#28
OK. I've taken almost all of your advice:
1) grantorino62: Checked throttle cable - it opens fully
2) WhiteXKR: Had both fuel pump relays replaced & verified functionality
3) Matthew: I have NOT yet changed the coolant, but I will look for "ketchup" when I do in February.
4) jamdmyres: I set-up Torque meticulously and used 4,100lbs for weight. Made sure Sport Mode on, Cruise switch off, HVAC off, Step-down switch engaged.
5) JohnKen: Validated againsr SpeedView app - same times.
Subsequent results are remarkably consistent, and I don't want to stomp on it anymore until I've done something to hopefully improve them. As hm1 pointed out, these are very close to expected values without the supercharger, so I am left to conclude that it is somehow failing to function.
Should I expect an indy to be able to diagnose & fix the SC? Honestly, I don't really care how fast it goes; It will just bug me if something isn't working properly.
Thanks all!
1) grantorino62: Checked throttle cable - it opens fully
2) WhiteXKR: Had both fuel pump relays replaced & verified functionality
3) Matthew: I have NOT yet changed the coolant, but I will look for "ketchup" when I do in February.
4) jamdmyres: I set-up Torque meticulously and used 4,100lbs for weight. Made sure Sport Mode on, Cruise switch off, HVAC off, Step-down switch engaged.
5) JohnKen: Validated againsr SpeedView app - same times.
Subsequent results are remarkably consistent, and I don't want to stomp on it anymore until I've done something to hopefully improve them. As hm1 pointed out, these are very close to expected values without the supercharger, so I am left to conclude that it is somehow failing to function.
Should I expect an indy to be able to diagnose & fix the SC? Honestly, I don't really care how fast it goes; It will just bug me if something isn't working properly.
Thanks all!
#29
#30
#31
An indy replaced the relays and I only presumed that he had to check that the fuel pumps were working. How would I verify this myself? (I read elsewhere that removing the primary FP relay would force the secondary to take its place; thus, if the car would start, the secondary must be working... does that have merit?)
#32
An indy replaced the relays and I only presumed that he had to check that the fuel pumps were working. How would I verify this myself? (I read elsewhere that removing the primary FP relay would force the secondary to take its place; thus, if the car would start, the secondary must be working... does that have merit?)
#33
#34
You can probably set it up to data log it so you don't have to look at the phone while driving. The graph will likely plot pressure against rpm. Which can identify a worn supercharger. If that doesn't reveal anything I would consider looking at exhaust pressure.
You could have a failing component. Back pressure will kill power in a big way. I believe I read a post here which said that the supercharger pumps often fail internally (the pump part)
You could have a failing component. Back pressure will kill power in a big way. I believe I read a post here which said that the supercharger pumps often fail internally (the pump part)
#35
I have inlet temp. and manifold pressure set in torque pro. Air temp works fine but pressure reads a steady 21.5psi no matter what engine is doing, even shut down.
#36
I haven't investigated all of the sensors on the jag yet, but since it is supercharged it does need something to tell the computer that it is making boost so it can alter the fuel delivery accordingly. It sounds like you might have a bad MAP (Manifold Absolute Pressure sensor) Is far as I can remember the Jag is supposed to produce between 13 and 14 psi max. So 21.5 probably means that you have a bad or disconnected sensor
#37
I haven't investigated all of the sensors on the jag yet, but since it is supercharged it does need something to tell the computer that it is making boost so it can alter the fuel delivery accordingly. It sounds like you might have a bad MAP (Manifold Absolute Pressure sensor) Is far as I can remember the Jag is supposed to produce between 13 and 14 psi max. So 21.5 probably means that you have a bad or disconnected sensor
I imagine the system knows boost is being made by using the information from the MAFS.
#38
Indeed the ROW 2000 cars don't have the MAP sensor, eventhough they have EGR, contrary the the NA market, where they did have the MAP sensor. I have attached a MAP sensor on mine (the cabling is there), but the reading via an odbii reader is a couple of values off, probably as its not calibrated in the ROW ECU as that one is not using it , but it was still usable for me to do some tests.
On the XKRs there is no pressure sensor, the MAP only measures the pressure or better said vacuum between the TB and Supercharger.
On the XKRs there is no pressure sensor, the MAP only measures the pressure or better said vacuum between the TB and Supercharger.