Originally Posted by XJR-99

I already have quite a many modifications done to get higher power output, including 17% bigger lower pulley, high flow cats, EAPJ catback system, Arden additional ECU ( specially designed for 4.0 XJR ), BMC CDA air intake, bigger intercooler and upgraded SC waterpump and Quaife LSD. Heads are machined to the brand new level this year and timing chain job also done a couple months ago. Based on dyno pulls, something do not work well since output is too low and go not increase after 5200rpm.

I run 1/4mile with 1.5 gallon of Shell V-Power ( US 93+ ) spare wheel and all tools removed from the trunk. Sport cats and new catback decrease weight also by 50lbs.

I think not very many have LSD in their cars and when I have tested starts with ESP on, it has really been diffifult to get start with combination of that system and LSD.

Later this year we will analyse where is the bottleneck for high output. I think intake is the major point to start.

I have driven both competitions on very slipery air fields, which are very far away from the grip level of real drag strips.

Adam, your time is really fantastic if the car has been 100% stock since I have not seen any stock car running under 13.6. You can check times from the Dragtimes. There we can see also Jason's 1998 XJR time of 12.77.