Replacement RRFPR for DASC
 

In another thread I wrote about some problems with my DASC equipped M44 318is.

I now need a replacement adjustable fuel pressure regulator.

There are quite a few different adjustable fuel pressure regulators on eBay but I'm not sure if any of these are suitable.

I understand I need something that will raise fuel pressure from stock to about 70/80psi at full boost (8 psi). These other regulators talk about adjusting the base pressure to about 43 psi but don't mention what the pressure will rise to.

Has anyone got any suggestions for a replacement regulator and how to adjust?

NB. I am in Australia

So it seems I need a FMU, not a FPR. These come in various ratios, or fully adjustable.

Does anyone know the ratio of the original unit?

Still looking for advice about the DASC fuel pressure regulator.

Today I used a tyre pressure gauge to check fuel pressure. I understand that at idle pressure should be around 43psi and this pressure should be maintained unless boost is present and then it should go up to 70/80psi.

At first I was getting a reading of 80psi (!) at idle. I am not sure how accurate the tyre pressure gauge is, but double seems a lot.

I decided to mess around with the adjustment, having read that you should adjust these so that they just start to vary the pressure. ie - they let the factory FPR maintain 43psi and provide extra fuel pressure when under boost.

With a little adjustment I found the point where it just started influencing the 43psi at idle.

However, when I rev the engine, even using just a tiny little amount of throttle so that it shouldn't boost, it goes straight up to 80psi or more (I saw 100psi at one point, which is the maximum of the gauge). This concerns me a lot.

So I am looking for some advice. Have you adjusted these and was yours the same or different? Should fuel pressure react so quickly and with so little throttle? Do I need a new RRFPR or further adjustment?