The other two mid-engined Jaguars

The XJ13 didn't go into production.

check the link

XJ13 (http://www.automotiveforums.com/vbulletin/showthread.php?t=380571)

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The Jaguar XJR-15 was based on the XJR-9 which won the 24 Hours of Le Mans in 1988.

check the link

V-12-powered Jaguar race cars (http://www.automotiveforums.com/vbulletin/showthread.php?t=381759)

The XJR-15 was designed by Peter Stevens, the same man who designed the McLaren F1. It first came out as a 1990 model. It had a 6.0 liter V-12 with 450 hp at 6,250 rpm and 420 lb-ft of torque at 4,500 rpm. It weighed around 2,300 pounds and went for over $800,000. Only 50 were built.

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The XJR-15 stemmed from a concept car by Jaguar Sport and Tom Walkinshaw Racing (TWR) called Project R9R. The R9R was developed by Jaguar Sport for the purpose of testing the endurance of carbon and plastic bodywork at high speeds. It was based mechanically on the V12-powered XJR-9, which won the 1988 Le Mans. After thousands of miles of testing and thorough analysis, the R9R went into production as the Jaguar XJR-15 in 1990. According to a press release by Jaguar, it was built specifically with the 1991 Jaguar Sport Intercontinental Challenge in mind.

The XJR-15’s chassis and bodywork are composed of carbon fiber and Kevlar. The XJR-15 has a 0-60 mph time of 3.1 seconds and a top speed of 185 mph.

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