"Would a rising rate fuel pressure regulator work on a turbo CIS M103?"

I don't think it will.


"Also, won't the turbo boost push the Air-Flap down, causing the fuel/air mixture to be altered incorrectly (the stock motor can only pull the flap down so far through suction, won't the turbo push it down too early causing a rich mixture?"

Yes, if you don't use a vacuum operated blow-off valve it will. However, it works perfectly with a blow-off valve in place.


"Untill it hits the bottom that is, then, provided the revs are up high enough you are back to a lean mixture). Is this the case?"

That's why you have to adjust the fuel pressure much higer.

Super SEC, how did you adjust the EHA? Does the M103 have an adjustable EHA? Can it be modified to enrichen the mixture with the increasing air flow?

I don't know if it has an EHA or not. I'd imagine it does if it is CIS-E. The EHA on my SEC is on the back side of the little black bok that is mounted to the side of the CIS. There is a little brass set screw that you have to remove to get to the adjustment. A little bit goes a long way.

My power is nearly double what stock is so my pressure is very high. I recently installed an air to air intercooler and a cold air intake for my supercharger so I may have to readjust the EHA once again to deal with the extra power.