After searching a bit for official specs for fuel pressure regulators for the XJ-S I determined that the Pre-HE, HE, and 6L spec 2 bar, 2.5 bar and 3 bar respectively. If anyone knows otherwise please let me know!

I built some charts for the expected regulated pressure at various manifold pressures for the HE and 6L. The Pre-HE is not manifold-referenced as best I know. I don't have any experience with those. I thought I would upload these charts in case they are helpful to anyone else.



Have a great weekend,
Drive it.

 

Why?

 

all you would really need is an AFR gage,(air-fuel-ratio)!
and an adjustable FPR (fuel pressure regulator), with manifold hook up!

AEM AFR controller.

FPR lower right red thing, adjustable pressure!