Fuel Pressure Regulators....

[Lukespeed 10]

Today after a long time of me saying il get my 205 set up properly, I finally got it set up on a rolling road.

 

I know no history of the engine as it got taken out of a car my friend bought purely for the shell and he bought it thinking it was standard.

 

Turns out, it has a massively lumpy rally cam in it which doesn't really work with injection, due to just buying a house I aren't quite in the position to do a bike carb conversion, and the bloke who set it up said fuel was dropping off after 5500rpm so it needs carbs, but it would maybe be worth trying an increasing rate fuel pressure regulator, has anyone had any experience of using them?

 

The car also has a vernier pulley on it and the head is ported and polished.

 

Any advice would be appreciated.

 

Cheers

[welshpug 1,662]

I'd stick a milder cam in it, or fit DTA.

[Anthony 1,003]

A milder cam sounds the best option really, as a big cam is always going to be a bit ugly on a plenum, especially on Jetronic with the AFM flapping away like a barn door in a gale.

 

However, was fuel pressure checked when it started to run lean? I'm wondering whether the fuel pump is getting a bit weak and struggling to keep up at high revs/load... its far from unheard of on later Ph2 pumps.

[toolie72 67 1 Cars]

Standard cam and sell lumpy one to go towards spending on car

Not a difficult job anyway

I must be dumb but I can't get my head round a different fuel pressure-if regulator works then pressure will be 3bar irrespective of fuel flow rate (or am I missing something?!?) the way I see it is if fuel system is a closed system and pressure is to be 3bar then if more fuel is required the regulator would compensate wouldn't it?

Aargh wish I'd paid attention more at the techy college

[GilesW 41]

Pump needs to ultimately supply x pressure at y volume (flow).

 

Flow requirements increase at higher revs as more fuel is needed and older pumps can struggle to keep the pressure up at these volumes (or actually the volume at these pressures).