I had an opportunity to go to Ennis, Texas for some quarter mile runs today With Bill D., another Jag driver. I still had a hard time getting hooked up off the line as evidensed by my poor 60' time below however I was able to get some pretty nice runs in none the less. My best time is attached.

Parameters:
82F
600' field elevation
1/2 tank of gas
Dynamic Mode
Traction control on (Tried it in Track DSC and spun even worse!)

Car weight, (Minus driver) 3930 LBS on track official scale

Ended up with a 12.066 ET at 123.08 MPH

No question a professional could get a better launch than me and I do believe this is a 11.6-11.7 ET car with the right driver and tires.

Remember my car has the smaller pulley and Eurocharged Tune. There is no question this makes a significant difference over the stock performance.





Walt

 

Thanks for sharing!

Wow, 12-flat with a 2.2 60ft, yes easily mid 11's if you could get it to hook up.

Time for some drag radials?

 

Thanks for the info. You must be happy with the trap speed. Did you run factory tire pressure? I have no idea if that matters, but I was at the track this weekend and ran 33psi cold (factory rec is 36) and it felt much better. Probably could go down a couple of more psi.

 

I watched Walt's car pour on the steam from mid track and come blazing past his opponent. The sound from the front was incredible. Fun times!

 

Thanks Walt, I like the 123 trap speed- the power is there.

 

Thanks Vic!

Factory pressures
Traction control on

Tried Trac DSC but seemed to spin the wheels more. Obviously a very fine line between too much power and spinning and not enough power and bogging down. I would need a lot more practice to perfect it and I don't really care to. I just wanted another pulley and tune data point to validate the mod. This ET does it for me.

Walt

 

You need MT Street Radials. Normal low profile street tires are just waste of time.

 

Just notice you got it weighed. Still boggles my mind the thing is 4000 pounds without driver!

 

Can you speak to your experience with Eurocharged? Did you order the pulley and flash and have a local shop do the install? Or, are you able to install the flash on your own. Thanks.

 

XJR-99
Not really my mission. I just wanted to see what the car would do on the tires I use on the street. No question MTs would change the launch dramatically.

Shift
Yes, a pretty heavy car.

gleonjr
https://www.jaguarforums.com/forum/f...ts-v8s-127932/

Again my point to all this was just to get another data point to show that the Eurocharged pulley and tune on my car made a performance difference. Unfortunately I did not have before 1/4 mile runs but comparing this to other stock runs I believe there is a pretty big improvement.


Here is a stock V8S.

Here are his times:


We are running pretty much the same ET but look at his 60' time of 1.838 vs my 2.230. That is a significant difference. I am much slower to 60' and we are both running stock tires. I think it is a combination or two things. My shitty launch capabilities and probably the extra torque I have wanting to spin the wheels.
Another significant thing to take away from this comparison is that my ending MPH is 123.08 vs his 117.04. If I could get his launch to 60' that would take off almost 4/10s of a second and put me in the 11.6 second range.
I suspect his OAT was cooler than my 82 degrees also.

Again I'm not doing this to set any records just add data points to what my car is doing now with the pulley and tune I have. There is so little information on these types of mods I simply wanted to add information for those also desiring this type of modification but are still sitting on the fence awaiting more information.

Walt

 

Drag times shows a few stock V8S times around 11.8 with one fast time on a car with drag radials and a euro charge tune at 11.69.

 

SWA
What do they show for speed at the end of the run?

Walt

 

Walt, I'll try to take a look and post later.

 

Here is the link to DragTimes and the F types:

Jaguar F-Type 1/4 Mile Drag Racing Timeslips - DragTimes.com

 

Looks like Hennessey did the massive burnout and picked up ET. Maybe another run at test and tune?

 

Here's a link to a RWHP calculator. Be sure to put in the weight with driver. My car (XFR-S) came out almost spot-on.

http://www.nitrousexpress.com/oldweb...alculators.htm