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Old 10-17-2010, 09:39 AM   #1
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Default Jaguar XJ8 with LS1 Conversion

Just thought I'd post a few pics of our prototype car here- this is a 1998 Jaguar XJ8 sedan with a Chevy Camaro LS1 V8 Conversion. This has been an ongoing project for a couple of months now, and the result (as you see it here) is a great running/driving car that has far exceeded our expectations. The new eng/trans package seems to have about the same weight as the original, so handling is unaffected, but the performance (compared to the original 4.0 Jag V8) is night and day. The car is a ball to drive. At the time these pictures were taken, the car had nearly 200 miles of city/highway driving on it.

Some wiring details are still being worked out, but this project will ultimately result in a kit and related parts for our to customers to do a similar conversion on their own cars. That would be for the 98-02 XJ8 and XJR sedans.

Some interesting details on this conversion:
  • Accessory drive- stock GM with no aftermarket parts
  • Exhaust manifolds- stock GM (high flow) cast iron
  • Oil Pan- mild modification on a standard GM pan (so mild that oil pickup remains unmodified)

One last note- much of what was done here would also apply to the Jag XK8 and XKR coupes and convertibles, and we plan to have a kit offering for those models as well soon.

Andrew

Click the image to open in full size.

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Last edited by John B; 10-30-2010 at 04:23 PM..
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Old 10-17-2010, 11:38 AM   #2
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nice car, but why 3 separate threads?
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Old 10-17-2010, 12:13 PM   #3
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Default 3 Threads- sorry that was some sort of glitch

Looks like the mod took care of it....
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Old 10-19-2010, 02:48 PM   #4
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how cabable are the factory rear suspension and differentials on these cars?
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Old 10-19-2010, 04:03 PM   #5
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Default Like the use of the stock exhaust manifolds

Looks like it all fits well and should be nice and quiet!
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Old 10-20-2010, 08:35 PM   #6
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Andrew,

I might have a(nother) victim. 1987 XJ6 with 65k original miles. Doesn't currently run from sitting up. I'd like to do an XJ8, but the price is right on this. I'll let you know.

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Old 10-23-2010, 10:18 PM   #7
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Quote:
Originally Posted by navi243 View Post
how cabable are the factory rear suspension and differentials on these cars?
The XJ8's had a 300HP engine from the factory. They should hold up just fine.
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Old 10-30-2010, 07:36 AM   #8
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Default That stock XJ8 engine....

Actually, that stock 300hp (actually 290) original Jag engine was full of problems from day one, with timing chain/tensioner issues (leading to piston/valve collision and major engine damage), early failing water pumps, premature cylinder bore wear, and others. Look on some of the Jaguar forums for more details. The timing chain tensioner parts were redesigned by Jaguar 3 times before the proper solution was released in 2002 (4 years after the XJ8 first appeared). Also, transmissions in these cars (built by ZF) were "sealed for life" which also seemed to lead to premature failure (before 100k miles).

And the supercharged version had all of the above problems and more....

The summary is that this original drivetrain had/has many reliability issues, which while repairable, are VERY EXPENSIVE to repair. As a result, there was an interest in some other eng/trans combo to make the car easier to own. The LS1 fits the bill perfectly. The cars themselves are great, it's just the original drivetrain that was the problem....

So that's why we're here now....
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Old 10-30-2010, 09:11 AM   #9
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I think the question was if the rear end will hold up. Since the original was a 290hp engine, Docked wage surmised it would, but I know there's a big difference in torque between the two. I still don't think the rear end is a weak link necessarily.
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Old 03-17-2011, 10:49 AM   #10
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Default Kits Now Available- XJ8 LS1 LSx Conversion

Just a little update on the Jaguar XJ8 LS1 conversion- this is now a regular product for Jaguar Specialties. For more info, get in touch:

Andrew@JaguarSpecialties.com

408 839 5569

And we have a similar kit for the XK8 and XKR cars on the way....
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Old 03-17-2011, 03:27 PM   #11
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Got a kit for the T56?
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Old 03-18-2011, 12:37 AM   #12
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Default XJ8 with T56

Now that would be cool, but a big problem fitting a clutch pedal and master cylinder on this firewall. Too crowded...
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Old 03-18-2011, 12:37 AM
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