Fuel, Unleader or SUper?

[jimmy]

Just bought a 96 (P) chimp 4l and wonder what fuel i should be running it on, most people say super unleaded.. Opinions please. r James

[Jason F]

I`m no expert but I seem to think that they can run as well on Ordinary unleaded, though some people use an octane booster ( I just run mine on Ordinary as I had the timing fixed )

[britzman]

Admittedly my car is pre-cat, but the TVR Centre advised me I could burn virtually anything I could get in the tank. During the petrol "crisis" I ran on single-malt scotch, as it was easier to get and only slightly more expensive than petrol. But seriously... if you have a cat I think you have to stick with unleaded, and my understanding (though I'm no expert) is that you need super-unleaded. If you want to run permanently on 95RON you need the timing retarded, though I think the newer AJP engines can run on either. P.S. Don't quote me... check with your local dealer.

[edward]

yeah it's all timing - Steve at Thames Valley checked mine after I bought it & ut had already been retarded a touch. If it isn't you'll suffer pinking under heavy loads (ie all the time). Interestingly I reckon super unleaded gives much better mpg than plain unleaded anyway - has anyone else spotted this?

[britzman]

edward, the mpg might be better but what about the miles per pound? But then I guess if you can afford to run a TVR it doesn't matter :-)