Not sure really, but Vortechs' old FMU(fuel management unit) used to use "discs" to ramp fuel pressure in 3:1, 4:1, 5:1, etc. ratios. However, here I've only read about the "washer" that Vortechs new inline pumps use to modify the ramp rate.

 

hmm,i did use any, unless thats the fmu unit, i think its 8:1 or 12:1

 

Yes, the FMU unit "washer". It looks like an 8:1 ratio(6Z050-191).

 

There is a guy that posted he had to use a diff washer that Vortech sent him because he lived at elevation....Cant remember the thread though

 

If you still use the Vortech FMU disc equation, for base fuel pressure of 52psi, an 8:1 ratio, and at 9psi, you'd have 1/2(base fuel pressure)+(PSIxRatio), so

1/2(52)+(9x8)=97.5psi of fuel pressure....that's way too high in my opinion.

A 6:1 would produce 85.5psi, which is as high as I'd personally ever go.

That would make:
290cc-->~407cc~372bhp
380cc-->~533cc~487bhp
440cc-->~617cc~564bhp
510cc-->~715cc~654bhp

Using a "safe" recommended 80% DC and BSFC=0.50 for SC'd cars.

 

Did Grubbs get the new injectors working ?...You havent posted any thing.....The Vortech guy would like to know