Bernd, all of the decent FMUs that I am aware of are tied to boost. The
Holley I use is every bit the quality of the Belltech piece you pointed to,
save for the gain onset feature of the new generation piece.
As I mentioned earlier, FMUs by nature are extremely difficult to fine tune.
Getting the A/F curve "in the ballpark" is fairly easy. It's the fine tuning
for best power that becomes difficult.
Bob
"Bernd D. Ratsch" wrote:
> The rising rate regulator we use bases fuel pressure increases against
> boost level. They're much more accurate than the standard plate-style
> FMU's (Vortech/Paxton, Powerdyne, ATI) and fine-tuneable on rate of
> increase (onset of gain adjustability). We don't recommend factory
> injectors with higher fuel pressures as (and you're totally correct)
> anything above 80% duty-cycle (bumping up the pressure in conventional
> s/c applications) has a tendency to lock them up. The FMS injectors can
> handle the extra pressure though.
>
> - Bernd
>
> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net
> [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bob Mankin
> Sent: Wednesday, October 02, 2002 10:58 PM
> To: dakota-truck@dakota-truck.net
> Subject: Re: DML: RE: Hit the dyno today...
>
> >
> > On the rising rate regulator, we've got A/F readings to disprove that
> > (12.0:1 in most cases). (No poke at ya on that one...just what we
> > found with the regulator we're using.)
> >
> > - Bernd
>
> Don't know exactly what you mean by rising regulator. If it's a simple
> 1:1 then all you're doing is countering the boost pressure and again 19#
> injectors are pretty much done(gone static) at 325 rwhp, and injectors
> really shouldn't be pushed beyond 80% duty cycles for reliable
> performance anyway.
>
> Bob
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