4.2L XKR & 5.0L XKR Tune Results
#21
That's is a fast trap speed. Can you post your timeslips please? What was your 60ft, 1/8th mile ?
what was density altitude is at that track at the time of your runs?
My best so far is 13.15 at 107mph trap but this is at 3650 ft density altitude, so corrected is around 12.9 and 109mph.
what was density altitude is at that track at the time of your runs?
My best so far is 13.15 at 107mph trap but this is at 3650 ft density altitude, so corrected is around 12.9 and 109mph.
Last edited by AlexJag; 04-09-2017 at 03:40 AM.
#22
+1 on seeing the time slips please!
Jump from 109.98 to 113.19 trap speed is a huge gain, you're knocking on the door of a stock 5.0L s/c car, and actually trapping higher than some stock 5.0L XFR's
https://www.jaguarforums.com/forum/m...andings-84783/
But the ET is still way down compared to a 5.0L, for example here this 5.0L XKR did 12.243 @ 114mph
They mention in the video comments a 1.79 60ft time, that's the key to getting a good ET, it nailed the launch.
Jump from 109.98 to 113.19 trap speed is a huge gain, you're knocking on the door of a stock 5.0L s/c car, and actually trapping higher than some stock 5.0L XFR's
https://www.jaguarforums.com/forum/m...andings-84783/
But the ET is still way down compared to a 5.0L, for example here this 5.0L XKR did 12.243 @ 114mph
They mention in the video comments a 1.79 60ft time, that's the key to getting a good ET, it nailed the launch.
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bfarrell (10-19-2021)
#23
See attached.
I really do struggle to get off the line cleanly which is why my times are so bad. The car is so quick to spin the right rear wheel and the section of track by the start gates seemed quite slippery. It joins a race circuit start/finish straight after a short while and once the car hits that it really digs in and takes off.
The altitude of the race track is around 43m.
These guys didn't seem to have my problem though!
I really do struggle to get off the line cleanly which is why my times are so bad. The car is so quick to spin the right rear wheel and the section of track by the start gates seemed quite slippery. It joins a race circuit start/finish straight after a short while and once the car hits that it really digs in and takes off.
The altitude of the race track is around 43m.
These guys didn't seem to have my problem though!
Last edited by u102768; 04-09-2017 at 05:51 AM.
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Cambo (04-09-2017)
#24
#25
Speed is HP. Time is efficiency. I never worry about the time beyond bragging rights. Your speed tells you how the engine is performing.
Also, I read in the service manual that the inner cooler's plumbing is regulated at 160`F. It shares the degas / fill bottle with the engine coolant. Thoughts on a stand alone setup? Dropping the temps to ambient + 12-20` should pick up a good bit of HP.
I figure Jag does it so they won't freeze up during winter. Maybe do a true split system with a valved connecting pipe for winter. I need to spend some time looking at the flow schematics.
Also, I read in the service manual that the inner cooler's plumbing is regulated at 160`F. It shares the degas / fill bottle with the engine coolant. Thoughts on a stand alone setup? Dropping the temps to ambient + 12-20` should pick up a good bit of HP.
I figure Jag does it so they won't freeze up during winter. Maybe do a true split system with a valved connecting pipe for winter. I need to spend some time looking at the flow schematics.
#26
See attached.
I really do struggle to get off the line cleanly which is why my times are so bad. The car is so quick to spin the right rear wheel and the section of track by the start gates seemed quite slippery. It joins a race circuit start/finish straight after a short while and once the car hits that it really digs in and takes off.
The altitude of the race track is around 43m.
These guys didn't seem to have my problem though!
https://youtu.be/5iu3NoR_80o
https://youtu.be/-3INKZ98kTU
I really do struggle to get off the line cleanly which is why my times are so bad. The car is so quick to spin the right rear wheel and the section of track by the start gates seemed quite slippery. It joins a race circuit start/finish straight after a short while and once the car hits that it really digs in and takes off.
The altitude of the race track is around 43m.
These guys didn't seem to have my problem though!
https://youtu.be/5iu3NoR_80o
https://youtu.be/-3INKZ98kTU
my bad day at the track I would be at 2.1 , on a good day I did 1.95
Your trap speed is very nice though, and a good indicator that you have gained hp.
__________________
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
#27
#29
I managed to get back to the drag circuit yesterday and set my worst ever and best ever times:
17.93@99.45mph
13.07@111.55mph
My terminal speed was a bit down on my previous outing and I am not sure if that is because I forgot to fill up with 98, had a full tank of petrol to try and improve traction or whether the day was a little warmer.
For the first run I tried switching the traction control totally off, dipped my rear wheels in the water trough then did a burn out. Traction was awful off the line. I kept easing off then pushing the accelerator again but each time the car would disappear in a cloud of smoke. I still couldn't stop the wheels spinning half way down the track. Judging by the number of comments I got afterwards it was quite spectacular to watch!
After that I used TRAC mode and avoided the water trough and that seemed much better. My 60 times are all still in the 2.2-2.3 secs range so traction is still an issue. The current tyres have been on the car three years now so are probably past their best and I really ought to fit an LSD.
As it was a proper racing day I had to dial in a time after three practice runs and race the other street cars in the afternoon. I made it through to the semi finals but then came up against the guys who run slicks on the rear and race at most sessions so eventually dropped out.
I am planning to get some high flow cats fitted in the next few weeks to try and get rid of the awful stink from the exhaust that I have running with no cats and will probably put the factory resonator back on at the same time to see how that setup sounds. I will then hopefully head back to the track next month so see what affect that has on my power.
17.93@99.45mph
13.07@111.55mph
My terminal speed was a bit down on my previous outing and I am not sure if that is because I forgot to fill up with 98, had a full tank of petrol to try and improve traction or whether the day was a little warmer.
For the first run I tried switching the traction control totally off, dipped my rear wheels in the water trough then did a burn out. Traction was awful off the line. I kept easing off then pushing the accelerator again but each time the car would disappear in a cloud of smoke. I still couldn't stop the wheels spinning half way down the track. Judging by the number of comments I got afterwards it was quite spectacular to watch!
After that I used TRAC mode and avoided the water trough and that seemed much better. My 60 times are all still in the 2.2-2.3 secs range so traction is still an issue. The current tyres have been on the car three years now so are probably past their best and I really ought to fit an LSD.
As it was a proper racing day I had to dial in a time after three practice runs and race the other street cars in the afternoon. I made it through to the semi finals but then came up against the guys who run slicks on the rear and race at most sessions so eventually dropped out.
I am planning to get some high flow cats fitted in the next few weeks to try and get rid of the awful stink from the exhaust that I have running with no cats and will probably put the factory resonator back on at the same time to see how that setup sounds. I will then hopefully head back to the track next month so see what affect that has on my power.
#30
Yeah sounds like you need an LSD and some new rubber.
The Quaife has made a huge difference to the way my XKR drives.
But in saying that, the first time I went to the track was with new tyres, but still with the open diff, and it hooked up fine with a 1.95 60ft time, but that was not giving it 100% off the line either.
Hopefully this Wednesday I can get back to the track and see how it launches with the LSD and not holding back.
The Quaife has made a huge difference to the way my XKR drives.
But in saying that, the first time I went to the track was with new tyres, but still with the open diff, and it hooked up fine with a 1.95 60ft time, but that was not giving it 100% off the line either.
Hopefully this Wednesday I can get back to the track and see how it launches with the LSD and not holding back.
#31
#32
The Quaife is awesome on the street, I drive around with the DSC completely off all the time now, it's so easy to drive, put your foot down and go, standing starts turning left, no problem! Whereas before it would just light up the inside wheel and make smoke.
A lot of this would be down to the new tyres too, got Michelin Pilot Sport 4S in 295 on the back which replaced the 5 year old and 80% worn Michelins which were pretty useless.
Yep 400 cell cats and x-pipe exhaust are in, it's a bit... LOUD! I had to put fuse 19 back in hahaha...
Also had to get the stock tune adjusted because of the cats and pipes, it definitely lost some power and responsiveness after the cats and pipe went in, but it's back to how it was now with the adjusted tune.
We've left everything else stock in the tune to try and get some before & after numbers to compare.
A lot of this would be down to the new tyres too, got Michelin Pilot Sport 4S in 295 on the back which replaced the 5 year old and 80% worn Michelins which were pretty useless.
Yep 400 cell cats and x-pipe exhaust are in, it's a bit... LOUD! I had to put fuse 19 back in hahaha...
Also had to get the stock tune adjusted because of the cats and pipes, it definitely lost some power and responsiveness after the cats and pipe went in, but it's back to how it was now with the adjusted tune.
We've left everything else stock in the tune to try and get some before & after numbers to compare.
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u102768 (10-23-2017)
#34
#35
I went back to the track tonight, was pretty warm 32°C but i'm pretty happy with the results.
12.87 @ 108.9mph
12.94 @ 111.5mph
This is still a STOCK tune, the only adjustments in the tune were for the cats/exhaust, everything else; fuel, timing, torque limiters, etc are still stock.
This is pretty much bang on the claimed 12.9 @ 109mph numbers for a stock XKR, so it's a good baseline, next time out will be the big banger tune like what we put in u102678's XKR, with a few adjustments. I'm really looking forward to the results
12.87 @ 108.9mph
12.94 @ 111.5mph
This is still a STOCK tune, the only adjustments in the tune were for the cats/exhaust, everything else; fuel, timing, torque limiters, etc are still stock.
This is pretty much bang on the claimed 12.9 @ 109mph numbers for a stock XKR, so it's a good baseline, next time out will be the big banger tune like what we put in u102678's XKR, with a few adjustments. I'm really looking forward to the results
#36
It has only done 16,000 miles and has most of the options ticked so appears to be well worth the cost of the upgrade. The down side is that it is also black so 99% of my friends and neighbors won't actually notice that I have changed my car!
I look forward to taking it to the drag strip and seeing what it will do though.
#37
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u102768 (10-28-2017)
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u102768 (10-28-2017)
#39
Thanks. I am looking forward to the cooling function of the seats as mine do get quite hot in the summer. It will also be interesting to see if the adaptive cruise is any better in the later models and also how the B&W Premium Sound System compares to the Alpine one.
My current car doesn't have keyless entry so that will be a nice addition and actually being able to see the track names through the ACM will be good as well.
The description field of the car in the factory spec sheet mentions Performance Aero Pack so that is a bonus and it has a real spare wheel rather than a can of something.
JaguarVoice(Japanese) is also listed but I suspect that will be lost once the nav unit is converted to European spec.
It also has Rich Oak veneer which I am not too fussed on but that may grow on me.
My current car doesn't have keyless entry so that will be a nice addition and actually being able to see the track names through the ACM will be good as well.
The description field of the car in the factory spec sheet mentions Performance Aero Pack so that is a bonus and it has a real spare wheel rather than a can of something.
JaguarVoice(Japanese) is also listed but I suspect that will be lost once the nav unit is converted to European spec.
It also has Rich Oak veneer which I am not too fussed on but that may grow on me.
#40