Another 1/4mi track drag racing event. New record for the XKR!
#1
Another 1/4mi track drag racing event. New record for the XKR!
Was a good day at a track in Bakersfield California, traction was good
! Had around 12 runs. My 08 4.2 XKR stayed very consistent with half of the runs around 12.6 and 4 runs at 12.59, finally at the very end I managed to pull 12.58 and a 12.55 at 112mph ,and this is with the day heating up and temperatures over 80 degrees , so a very good sign of the capability of the car. Keep in mind my XKR is a convertible so it's 100lb heavier and I'm running stock open differential and on street tires.
I was surprised my car was neck to neck with a 2012 Cts-v rated at 550hp his best run of the day was 12.66
! Had around 12 runs. My 08 4.2 XKR stayed very consistent with half of the runs around 12.6 and 4 runs at 12.59, finally at the very end I managed to pull 12.58 and a 12.55 at 112mph ,and this is with the day heating up and temperatures over 80 degrees , so a very good sign of the capability of the car. Keep in mind my XKR is a convertible so it's 100lb heavier and I'm running stock open differential and on street tires.
I was surprised my car was neck to neck with a 2012 Cts-v rated at 550hp his best run of the day was 12.66
__________________
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
Last edited by AlexJag; 04-07-2019 at 12:40 PM.
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MarkyUK (04-07-2019)
#2
#3
Stock 5.0 would be close
Last edited by AlexJag; 04-07-2019 at 12:57 PM.
#4
#5
Tune on these cars has the biggest gain potential. I gained nearly 100hp to the crank , majority of the gains are in the tune programming
__________________
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
#7
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#8
After I installed high flow cats and I developed a tune for our cars using a Dyno. I got 434 rwh in 3rd gear and 426 rwh in 4th gear. This is with safe and modest settings , no crazy timing advance and tuning on crappy CA 91 gas. I know I can still squize out a good amount tuning for race gas.
As far as race tracks. At slower Las Vegas track with pulley only mod I ran best of 13.35 and 105mph trap speed. After aditional mods and tune ran 12.61 and 111mph on the same track and similar conditions. Pretty nice gain!
Both times at Las Vegas track I raced friends Cadillac xlr-v , when I was near stock he ran 13.7 best and we were close,. Time when I was moded he ran 13.8 and we were not really close at all any more
__________________
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
Last edited by AlexJag; 04-08-2019 at 10:54 PM.
#9
Slight correction to the post above: stock with pulley only Dyno was at 359 not 369
__________________
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
#10
#11
As to your question on better take off: for me personally at the track I had best identical 60ft times of 1.88 if I just floored it off the line or if I preloaded by holding the brakes, so can't say one has advantage over the other. Now on the street I think I will give the advantage to holding the brakes to take off. I believe this mode to have less wheel spin and slightly better take off on the street , but can't say it's better at the track yet, more testing on the way.. I don't go much higher than 1100rpm when I preload the brakes, going further gives me wheels spin , but this is with tuned car , lots more torque of the line
I must say ecu Tune has made a big difference compared to stock ,from average of 2.01 to avrg of around 1.92 60ft now
__________________
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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