I never said the whole PCM stops working after 4500rpm. what i meant to say
is that certain forces (maybe PCM, maybe Intake Manifold, maybe Exhaust)
are causing the dive on the graph from 4000-4500 rpm.
Steve
""Bob Mankin"" <bob@coralfarms.com> wrote in message
news:001a01c30d33$5d3feeb0$6401a8c0@BOBHOME...
>
>
>
> > -----Original Message-----
> > From: owner-dakota-truck@bent.twistedbits.net
> > [mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of Steve
> > Spencer
> > Sent: Sunday, April 27, 2003 6:14 PM
> > To: dakota-truck-moderator@bent.twistedbits.net
> > Subject: DML: Re: Re: 206 cams?
> >
> >
> >
> > Hey there,
> > The issue is that the PCM tables arent mapped for 4500rpms or
> > greater which
> > explains the
> > dive on the dyno graphs. The only thing is to wait for a '01+
> > 4.7 flash to
> > solve the issue.
> > Another possibility might be the exhaust system. The
> > manifolds dont exactly
> > breath effeciently
> > along with the precats. Only probelms ive had are with the
> > erratic stalling
> > when coasting to a stop in neutral.
> > I dont have the valve springs installed but that is on the
> > things to do
> > list. Dont have the HO intake either.
> > I kinda want to wait for a better designed intake but who
> > knows how long
> > thatll be.
> > For a list of my mods you can visit my webpage at
> > http://www.geocities.com/surfdog1/baddak
> > So are the cams worth it?
> > I would say yes but ONLY if you have the basic mods : CAI,
> > TB, FULLEXHAUST,
> > PCM
> > PCM being most important.
> >
> > Cya,
> >
> > Steve
> > '01 RC 4.7 5spd
> >
>
> I would hope that is a typo. Not likely the mapping for the 4.7L stops at
> 4500 because the stock auto shifts higher than that. Probably other
reasons
> for the dive on the dyno sheets. That whole table mapping thing got
started
> based on some comments by Marty of KRC, but I'm fairly sure the cutoff
point
> is much higher than 4500 rpms.
>
> The pre-cats things gets more play than it should as well. They are not
that
> restrictive. Bone stock R/Ts have been dyno'd many times and you don't see
> any significant HP or torque loss between '00 models which have no
pre-cats
> and the '01+ models which do.
>
> Bob
>
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:46:13 EST