Quest For 450 Horsepower
#321
but 3.2,in these jags id say is impossible.
it would need a prepped drag strip , slicks and 650-700hp with lsd .
mine is way modded and has near to 500bhp .
admittedly no lsd .and I still struggle to get 5sec to 100kph on a road surface .
slightly better on asphalt.
when mine was stock I could never better 6sec on the bitumen.
#322
#323
On a prepped Ashfelt surface.
As I said this is dam near impossible on bitumen road surface.
I have managed a five second in all the times I’ve tried. It is quite the task to undertake trust me.
5.75 I would say is very good for a 400 hp 1800KG car that is one wheel drive.
#324
This is what I got from Car and Driver later when the XJR had 40,000 miles on the odometer. Back at the track, the XJR had matured into a friskier cat. The sprint to 60 now took just 4.7 seconds and the quarter-mile 13.2 at 107. More impressive were the Jag's numbers from 0 to 100 and 0 to 130. New, the XJR reached the century mark in 12.2 seconds and 130 mph in 23.6 seconds; after 40,000 miles, the times were 11.3 ticks and 20.7...
#325
I am sure my results are skewed.
I plan on doing same type of run same place in the Rover as a comparison. One stock set up one with VAP tune.
Trouble is the road back in 2016 was not built up now it has spaced out large houses set well back from the road. Excellent views but all I need is someone reporting me
so have to find another road somewhere.
I plan on doing same type of run same place in the Rover as a comparison. One stock set up one with VAP tune.
Trouble is the road back in 2016 was not built up now it has spaced out large houses set well back from the road. Excellent views but all I need is someone reporting me
so have to find another road somewhere.
#326
This is a very good resource supposedly the most accurate on the internet https://www.zeroto60times.com/ 4.9 xjr...I looked up a 1990 Iroc Z Camaro which I used to have and it's a dog sled compared to the XJR and they're showing 5.7 seconds 0 to 60... I think it had 240 horsepower
Last edited by viper1996; 10-29-2019 at 11:04 AM.
#327
Most accurate device I ever used is " Dragy", I use it all the time and times are dead on acurate with actual time slips at the track
For reference best 0-60 I have ever gotten was actually on the street and not the track , with street tires and perfect launch 3.8 0-60 (with 1 ft rollout as factory cars are tested) or 4.05 ( without 1 ft rollout)
Most of the time I'm at around 4 sec mark (without 1ft rollout) or 4.3 with it
Car is 2008 convertible XKR, dynoed 430 rwh on Mustang Dynometer or around 470 rwh on Dynojet
For reference best 0-60 I have ever gotten was actually on the street and not the track , with street tires and perfect launch 3.8 0-60 (with 1 ft rollout as factory cars are tested) or 4.05 ( without 1 ft rollout)
Most of the time I'm at around 4 sec mark (without 1ft rollout) or 4.3 with it
Car is 2008 convertible XKR, dynoed 430 rwh on Mustang Dynometer or around 470 rwh on Dynojet
__________________
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; 10-29-2019 at 02:32 PM.
#328
#329
#330
#331
#332
Tires
I run R888r in the rear. They hook very well. When they were new, i couldnt spin them if the ground was dry. Theyre not the cheapest though
#333
With or without Nitrous? Aren't the 285/35R19s to wide for the rim width?
Last edited by viper1996; 10-30-2019 at 12:41 PM.
#334
I have 285/35/19 instead of 275 no fitment issues, thinking of going even wider.
Last edited by AlexJag; 10-30-2019 at 01:43 PM.
#335
I never sprayed on a launch, only from a roll so far. I am confident that they would hook though. I have seen those tires hook for some really high HP cars. I have 285/30/20 on the rear, fenders rolled.
#336
I'd love to see some pictures of your car with the wheels and how it looks if you ever get a chance. Forgot to ask do you have an LSD differential?
#338
This is when i first got them and was switching my Pirelli P-Zero 295s for the R888r 285
I don't have LSD, but they still hook somehow. The tires are very soft. If its cool outside, which it rarely is in Florida, i just put a bit of heat into them and then they grip.
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viper1996 (11-01-2019)
#339
#340
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