12.935 @ 107.21mph - my XJR
#1
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Updated 19th April 2017 - go to post #31 for latest
That was my best (recorded) run today at Santa Pod.
60ft : 2.0218 sec
1/8 mile ET : 8.6073 sec
1/8 mi mph : 83.65mph
1/4 ET : 13.2541 sec
1/4 mi mph : 105.44
I say recorded because the timing system went down & one of my runs (which of course, felt like the best one) was lost by the system...![Frown](https://www.jaguarforums.com/forum/images/smilies/frown.gif)
BUT i'm pretty happy with this result!!!
That was my best (recorded) run today at Santa Pod.
60ft : 2.0218 sec
1/8 mile ET : 8.6073 sec
1/8 mi mph : 83.65mph
1/4 ET : 13.2541 sec
1/4 mi mph : 105.44
I say recorded because the timing system went down & one of my runs (which of course, felt like the best one) was lost by the system...
![Frown](https://www.jaguarforums.com/forum/images/smilies/frown.gif)
BUT i'm pretty happy with this result!!!
![](https://www.jaguarforums.com/forum/attachments/xj-xj6-xj8-xjr-x350-x358-28/44472-12-935-%40-107-21mph-my-xjr-jl4c1374.jpg?dateline=1370123063)
Last edited by Cambo; 04-19-2017 at 06:12 AM.
The following users liked this post:
WaterDragon (06-09-2013)
#3
#5
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DSC off, Sport Mode off, e-brake holding me at the line & just floor it.
Had to warm the tyres up (actually ended up pulling rubber off the track & onto the tyres) and obviously the Quaife LSD did it's job.
Was really worried about traction but it wasn't too bad in the end. Could maybe get another tenth or two of the 60ft time with better rubber.
Had to warm the tyres up (actually ended up pulling rubber off the track & onto the tyres) and obviously the Quaife LSD did it's job.
Was really worried about traction but it wasn't too bad in the end. Could maybe get another tenth or two of the 60ft time with better rubber.
Last edited by Cambo; 06-02-2013 at 10:16 AM. Reason: tenth or two, not half-second!
#6
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I would have thought Sport On, DSC off was best.
Have you tried that?
I would have held the footbrake till the converter engaged
Its good to work out what is the best off the line for the track
How do you keep the Ebrake on?
When you hit the gas it turns off the Ebrake, Do you keep the button depressed to do that?
Cheers
34by151
Have you tried that?
I would have held the footbrake till the converter engaged
Its good to work out what is the best off the line for the track
How do you keep the Ebrake on?
When you hit the gas it turns off the Ebrake, Do you keep the button depressed to do that?
Cheers
34by151
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#8
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I would have thought Sport On, DSC off was best.
Have you tried that?
I would have held the footbrake till the converter engaged
Its good to work out what is the best off the line for the track
How do you keep the Ebrake on?
When you hit the gas it turns off the Ebrake, Do you keep the button depressed to do that?
Cheers
34by151
Have you tried that?
I would have held the footbrake till the converter engaged
Its good to work out what is the best off the line for the track
How do you keep the Ebrake on?
When you hit the gas it turns off the Ebrake, Do you keep the button depressed to do that?
Cheers
34by151
I could probably get a 13.1 out of the car as-is with some more practise.
The e-brake is simple. Pull it up to activate & it holds the car on the line at idle, foot off the brake pedal, & just get on the gas when you see the yellow light on the tree. You launch from idle. See the video it hooked up pretty well, didn't bog down badly or anything.
I tried left foot braking & loading up some revs, just resulted in massive wheelspin. My tyres were pretty bad, I think with some good, soft, wide rubber (thinking 285/40/18 on some late 2010 onwards X150 rear alloys) the load up with left foot braking could be more effective.
The e-brake slows down the reaction time (one of the other guys yesterday did 3 runs using e-brake, 3 using foot brake, & foot brake was a bit quicker on the RT) but just going for an ET on paper, the RT doesn't matter too much.
You have to heat up the tyres though....
![](https://www.jaguarforums.com/forum/attachments/xj-xj6-xj8-xjr-x350-x358-28/44524-12-935-%40-107-21mph-my-xjr-jl4c1114.jpg?dateline=1370186946)
![](https://www.jaguarforums.com/forum/attachments/xj-xj6-xj8-xjr-x350-x358-28/44525-12-935-%40-107-21mph-my-xjr-jl4c0201.jpg?dateline=1370186946)
Last edited by Cambo; 06-02-2013 at 10:29 AM.
The following users liked this post:
Cambo (06-04-2013)
#11
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Thanks guys.
So I was going to make another thread about the dyno run, but I may as well put it here too...
Was dyno'd in the UK, on a (proudly) Australian-made Dyno Dynamics rig.
Here is the sheet from the best run. A couple of things to point out though...
- The rpm indication is ~300rpm too high, since the Jags have coil-on-plug ignition, it's not possible to get a precise rpm measurement, the dyno calcuates it.
- Altitude is approx 50m above sea level
- Ambient temp 21°C, humidity ~60%
- The HP figure is at the wheels
- The 2nd curve was the measured Lambda, for air-fuel-ratio at tailpipe.
![](https://dl.dropboxusercontent.com/u/11575086/Dyno%2031%2005%202013.jpeg)
The dyno actually came up with a figure at the flywheel of 420.1HP, however I questioned the operator about the drivetrain losses because I saw another X350 XJR have measured losses of 21%. The operator said 22-23% is common. If we take 21% then that makes ~432HP at the flywheel. The 420HP figure suggests losses of around 19.25%, which is lower than previously seen, as well as what the operator suggested.![Confused](https://www.jaguarforums.com/forum/images/smilies/confused.gif)
In any case, somewhere around 432HP at the flywheel is as good a guess as possible...
The first couple of runs were done with the bonnet open, and the engine cover removed, not ideal but I really wanted to hear the supercharger![Icon Goofygrin](https://www.jaguarforums.com/forum/images/smilies/icon_goofygrin.gif)
As it turns out, the engine made 20HP less at the wheels like that. With the engine cover replaced & the bonnet closed, it did that last run as per the sheet above.
We could not get a measurement out of the left side exhaust above ~3000rpm, the exhaust gas flow was there at idle, & low revs, but dropped away at full throttle. The back box is damaged & choking the engine
I did actually smash the left back box by driving over a kerb in a petrol station not long after I bought the car (one of the dangers of driving RHD car in a LHD country) but I thought it was OK, apparently not...gas flow out the right side tailpipe was fine...
Sooo...to sum up the car
98'500 miles on the engine (at the time)
New Denso Iridium plugs only 2500miles old
3lb upper pulley, Bosch 010 intercooler pump
Qwiketz intake elbow, K&N filter, WOT flap removed from airbox
Original cats, original exhaust, with a collapsed back box
Regarding the AFR's, the operator described them as "rich as F#&%!" and that another 15-20HP could be had from a tune.
As for the exhaust, well the damaged back box must be costing me something, and the original cats...well who knows for sure? There's still a bit to be had from the old girl yet!
Looking at globlue90's charts as a benchmark https://www.jaguarforums.com/forum/s...-thread-79842/ it seems that my power curve flattens out whereas his just keeps on going up, spinning the Eaton too fast? Exhaust/cats holding it back?
Whatever the case, i'm happy with the numbers so far, especially with those miles. Just look at the 1/4 mile results!
So I was going to make another thread about the dyno run, but I may as well put it here too...
Was dyno'd in the UK, on a (proudly) Australian-made Dyno Dynamics rig.
Here is the sheet from the best run. A couple of things to point out though...
- The rpm indication is ~300rpm too high, since the Jags have coil-on-plug ignition, it's not possible to get a precise rpm measurement, the dyno calcuates it.
- Altitude is approx 50m above sea level
- Ambient temp 21°C, humidity ~60%
- The HP figure is at the wheels
- The 2nd curve was the measured Lambda, for air-fuel-ratio at tailpipe.
![](https://dl.dropboxusercontent.com/u/11575086/Dyno%2031%2005%202013.jpeg)
The dyno actually came up with a figure at the flywheel of 420.1HP, however I questioned the operator about the drivetrain losses because I saw another X350 XJR have measured losses of 21%. The operator said 22-23% is common. If we take 21% then that makes ~432HP at the flywheel. The 420HP figure suggests losses of around 19.25%, which is lower than previously seen, as well as what the operator suggested.
![Confused](https://www.jaguarforums.com/forum/images/smilies/confused.gif)
In any case, somewhere around 432HP at the flywheel is as good a guess as possible...
The first couple of runs were done with the bonnet open, and the engine cover removed, not ideal but I really wanted to hear the supercharger
![Icon Goofygrin](https://www.jaguarforums.com/forum/images/smilies/icon_goofygrin.gif)
As it turns out, the engine made 20HP less at the wheels like that. With the engine cover replaced & the bonnet closed, it did that last run as per the sheet above.
We could not get a measurement out of the left side exhaust above ~3000rpm, the exhaust gas flow was there at idle, & low revs, but dropped away at full throttle. The back box is damaged & choking the engine
![Icon Eek](https://www.jaguarforums.com/forum/images/smilies/icon_eek.gif)
Sooo...to sum up the car
98'500 miles on the engine (at the time)
New Denso Iridium plugs only 2500miles old
3lb upper pulley, Bosch 010 intercooler pump
Qwiketz intake elbow, K&N filter, WOT flap removed from airbox
Original cats, original exhaust, with a collapsed back box
Regarding the AFR's, the operator described them as "rich as F#&%!" and that another 15-20HP could be had from a tune.
As for the exhaust, well the damaged back box must be costing me something, and the original cats...well who knows for sure? There's still a bit to be had from the old girl yet!
Looking at globlue90's charts as a benchmark https://www.jaguarforums.com/forum/s...-thread-79842/ it seems that my power curve flattens out whereas his just keeps on going up, spinning the Eaton too fast? Exhaust/cats holding it back?
Whatever the case, i'm happy with the numbers so far, especially with those miles. Just look at the 1/4 mile results!
![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)
#13
#15
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Tyres are 5-year old Falken FK452's, 255/35R20, they are pretty hopeless on the street if i'm honest. Trying a launch like that at a traffic light will only result in wheelspin & very little forward motion.
I burned them up pretty hard for the first run, & moved well out of the box, this pulled a lot of rubber off the track & onto the tyres (the starter actually came over & told me off for doing it) but it got them fairly sticky. After that I only did small short burnouts like in the video.
Wider & stickier is the way to go for me!
GT42R wanted a dyno printout showing the torque, here it is;
![](https://www.jaguarforums.com/forum/attachments/xj-xj6-xj8-xjr-x350-x358-28/44761-12-935-%40-107-21mph-my-xjr-xjr%2520dyno%2520flywheel.jpg?dateline=1370445011)
Don't forget the rpm scale is out by a few hundred revs, i'd probably take 500rpm off.
I burned them up pretty hard for the first run, & moved well out of the box, this pulled a lot of rubber off the track & onto the tyres (the starter actually came over & told me off for doing it) but it got them fairly sticky. After that I only did small short burnouts like in the video.
Wider & stickier is the way to go for me!
GT42R wanted a dyno printout showing the torque, here it is;
![](https://www.jaguarforums.com/forum/attachments/xj-xj6-xj8-xjr-x350-x358-28/44761-12-935-%40-107-21mph-my-xjr-xjr%2520dyno%2520flywheel.jpg?dateline=1370445011)
Don't forget the rpm scale is out by a few hundred revs, i'd probably take 500rpm off.
#16
#17
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Cambo,
It will be interesting to see what my xjr does after the new cats are in as both of our cars are so similar in mods
I will get reports after the cats are done (2 weeks) as this weekend is a long weekend and im going flying rather than work on cars!!!
The 101 pump, belts and pulley will go on after that
Do you really thing the flap removal has a benefit?
Cheers
34by151
It will be interesting to see what my xjr does after the new cats are in as both of our cars are so similar in mods
I will get reports after the cats are done (2 weeks) as this weekend is a long weekend and im going flying rather than work on cars!!!
The 101 pump, belts and pulley will go on after that
Do you really thing the flap removal has a benefit?
Cheers
34by151
#18
#20
![Default](/forum/images/icons/icon1.gif)
Sure it's big, but it's not exactly heavy, which helps a lot.
I'm as it's damaged, i'm going to have to do something about the exhaust.
New cats & a free-flowing system are on the cards once it gets down to Oz.
I also have a set of new 255/35R20 Mickey Thompson Street Comps waiting down under, which will also help i'm sure.
12's would be nice, and it looks to be within reach
I'm as it's damaged, i'm going to have to do something about the exhaust.
New cats & a free-flowing system are on the cards once it gets down to Oz.
I also have a set of new 255/35R20 Mickey Thompson Street Comps waiting down under, which will also help i'm sure.
12's would be nice, and it looks to be within reach
![Smile](https://www.jaguarforums.com/forum/images/smilies/smile.gif)