E type jaguar

[esv683]

Why did jaguar fit 3.54.1 diffs to US spec E types ?

[fareaster]

Because they were so down on power with all the emissions stuff on them they coudn't pull the skin of a rice pudding with a taller diff.
Added to that you can't do more than 65 mph there.

[lowdrag]

To be fair it wasn't until emission controls came in in California that they fitted them and with the strangled twin strombergs they lost, I think, about 40bhp pulling them down below 200. Many now are retrofitted with longer axles though.

[esv683]

Thanks for the info,so from that i can take it that a 3.54.1 is ideal for a uk spec hillclimb and sprinter

[fareaster]

My memory, which is far from infallible, tells me that the series 2 California cars had as low as 170 bhp. Contributing factors were lower comp. ratios, strombergs, EGR, air pump, power steering pump and A/C pump. While I was doing my apprenticeship at Browns Lane I used drive the California, “rest of USA” and “rest of the world” spec. cars straight off the production line, the difference in performance/response was huge.