Originally Posted by clubairth1

Yes I have no personal experience with copper plugs that was just the recommendation from VAP's tuner and he has a lot more experience with tuning Jag's than I do. You also see it recommended on other cars too. When I ran the Texas mile I talked to a Cadillac guy pushing around 1000 HP at the wheels and he ran copper plugs and changed them every 10K miles! So that kind of put me off on adding the upper pulley. Plus the install is much harder for a smaller gain than what you get with the lower pulley. Which is just plain simple and quick to install.

I wish mine was a flex-fuel model so I could get into running corn. It strange because we do have at least one member on the forum that DOES have a flex-fuel 5.0L SC model. He even posted the sticker on the fuel filler. Don't know why Jaguar left it off the XJR? Hope he can jump in this thread and add his experiences.
Maybe a Meth injection setup will be next but again no kit and your on your own to rig it up.
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Originally Posted by etheliters

I've got a flex fuel 5.0SC. Has anyone seen it heard of a E85 tune? It's usually 30-40 more horses just from the conversion.

Originally Posted by clubairth1

Seems surprising that no tuner can do this?
VAP has tuned a lot of Jaguars too.
Maybe Stuart from VAP can post why they don't/can't do this?
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