Drag racing night! Mightht have the fastest 1/8mi in the world for a 4.2sc XKR
Might have the fastest 1/8mi time in the world for 4.2 supercharged XKR. Mods and the tune do pay off :)
Ran with street tires, temperature in the 70s There was lots of interesting cars there , 2009 1.Aston Martin Vantage v8, stock, ran best of 8.8 83mph 2.0 60ft( a little slower than I expected for this car) 2.Infinity q50s red sport, exhaust , best of 8.26 86mph 3. 2015 5.0 Mustang stock auto, best of 9.0 (way slower than expected) 4. Jaguar XJR 4.2sc with exhaust , 3lb pulley, ran best of 8.5 83mph https://cimg2.ibsrv.net/gimg/www.jag...4af7755cc2.jpg https://cimg5.ibsrv.net/gimg/www.jag...1c52301a14.jpg cant wait for the 1/4mi results Stay tuned.... |
Originally Posted by AlexJag
(Post 1980007)
I think I might have the fastest 1/8mi I'm the world for a 4.2 supercharged . Street tires
cant wait for the 1/4mi results Stay tuned.... Will be interested to see what your 1/4 mile results are. The highest terminal speed I saw in my 4.2 was 113.19 but Cambo pipped me with 115.36. |
Originally Posted by u102768
(Post 1980015)
Looks good but it depends what you mean by fastest, Cambo's 1/8 mile mph was 91.210 so you have a little way to go https://www.jaguarforums.com/forum/i...lies/smile.gif
Will be interested to see what your 1/4 mile results are. The highest terminal speed I saw in my 4.2 was 113.19 but Cambo pipped me with 115.36. |
I assumed that is what you meant but you did say fastest, hence my confusion:
https://www.dragimportnews.com/tech/...quick-vs-fast/ |
Originally Posted by u102768
(Post 1980039)
I assumed that is what you meant but you did say fastest, hence my confusion:
https://www.dragimportnews.com/tech/...quick-vs-fast/ |
Interesting that a 4.7 Aston only posted a 8.8 Ive regularly locked down 8.7/8.8 in a 4.2 N/A
Alex a 8.0 1/8 is really moving should be good for a 12.4 |
Originally Posted by steve_k_xk
(Post 1980440)
Interesting that a 4.7 Aston only posted a 8.8 Ive regularly locked down 8.7/8.8 in a 4.2 N/A
Alex a 8.0 1/8 is really moving should be good for a 12.4 I agree about the 1/4mi time I should easily be under 12.5 or better.. |
Unfortunately the track I use didn't list 1/8 mile times when I had my 4.2 litre but I have just had a look through the ones for my 5 litre XKR and none of the 6 runs I did when it was stock were under your time for the 1/8 mile although they were mainly 6 mph or more faster which I guess highlights my traction issue.
Out of the two visits with my current config, 3 out of 9 runs were better on the first visit and 3 of the 5 runs on the other were so yours is a pretty quick time. I think that the 5 litre comes in to its own though in the second half of the 1/4 mile because that is when I catch and pass most of the cars I am racing so it will be interesting to see what you 1/4 mile times are. You must have very good traction so what tyres are you using and I assume you have an LSD? Also, what technique do you use to launch? |
Originally Posted by u102768
(Post 1981090)
Unfortunately the track I use didn't list 1/8 mile times when I had my 4.2 litre but I have just had a look through the ones for my 5 litre XKR and none of the 6 runs I did when it was stock were under your time for the 1/8 mile although they were mainly 6 mph or more faster which I guess highlights my traction issue.
Out of the two visits with my current config, 3 out of 9 runs were better on the first visit and 3 of the 5 runs on the other were so yours is a pretty quick time. I think that the 5 litre comes in to its own though in the second half of the 1/4 mile because that is when I catch and pass most of the cars I am racing so it will be interesting to see what you 1/4 mile times are. You must have very good traction so what tyres are you using and I assume you have an LSD? Also, what technique do you use to launch? |
That is an amazingly quick time then. My old 4.2 XKR with open diff was hopeless off the line, even after getting Michelin Pilot Super Sports the best 60 time I did was 2.2. Before changing the tyres it was usually in the 2.4 to 2.5 range. It also used to bog down unless I partially took the traction control off.
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Originally Posted by u102768
(Post 1981131)
That is an amazingly quick time then. My old 4.2 XKR with open diff was hopeless off the line, even after getting Michelin Pilot Super Sports the best 60 time I did was 2.2. Before changing the tyres it was usually in the 2.4 to 2.5 range. It also used to bog down unless I partially took the traction control off.
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