[ROVERNET - UK] SD1 Vitesse/EFI: which fuel pressure regulator (standard/adjustable)?

[pj.info]

Hi Kent,

Thank you for your reply.  Fortunately, the emission check is done at idle speed. I'll have a check if the Rimmers adjustable regulator is a rising rate one (any idea?), otherwise I'll probably go for the RPI one.

Best regards,
Pierre.

Le lundi 21 janvier 2008 23:45, vous avez écrit :
> No, It only increases fueling at high RPM as I understand.  It would 
> depend on how your emissions tests are run.  If anything, I think it may 
> help with emissions.  I have not used the one RPI sells, but I have used 
> the Mallory adjustable bypass type regulator with good success on both 
> fuel injection and carb engines or even to use a carburetor with the 
> high pressure Bosch pump (the Mallory regulator comes with an assortment 
> of springs to tune it to various pressures, thus allowing it to serve 
> both EFI and Carb engines).
> Kent K.
> 
> pj.info wrote:
> > Hi Kent
> >
> > Thank you for the hint. Btw. do you think this replacement would basically affect the emission values?
> >
> > Best regards,
> > Pierre.
> >
> > Le lundi 21 janvier 2008 22:14, vous avez écrit :
> >   
> >> Hi Pierre,
> >> Replacing the fuel pressure regulator is a good idea anyway.  The 4CU 
> >> systems tend to run lean at the top end and the standard fix has been to 
> >> install a rising rate fuel pressure regulator.  RPI sells them and has 
> >> listed them on their Ebay store in the past.
> >>
> >> Roverly,
> >> Kent K.
> >>
> >> pj.info wrote:
> >>     
> >>> Dear Rovernetters
> >>>
> >>> I noticed that the membrane of my pressure regulator lets air passing through 
> >>> from the fuel supply / tank return side to the manifold depression pipe side. 
> >>> Is this normal? I suspect the regulator being defective. (I already had 
> >>> several cold start problems -just unwilling to fire up- although the battery 
> >>> was in perfect condition and the distributor / spark plug cables ok and fuel 
> >>> flowing though the rails by slightly depressing the flap of the air-flow 
> >>> meter).
> >>>
> >>> Having had a look at Rimmers,  there are 2 possible choices for the fuel 
> >>> pressure regulator:
> >>> - Standard	ERR268 (now replaced by EAC1284P)
> >>> - Adjustable	EAC1284UR
> >>>
> >>> => Does the adjustable regulator fit just in place of the standard one?
> >>> => Does anybody have had any experience with adjustable pressure regulators, 
> >>> i.e. how would you tune it (could this have an influence on the pollution 
> >>> figures NOx,CO,...)?
> >>>
> >>> Thank you for your advice.
> >>>
> >>> Best regards,
> >>> Pierre.
> >>> '86 SD1 - Vitesse
> >>>
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