No question on that one...4500-4800 is about max (stock configuration). We did
try a set of headers on a 4.7L a while ago...no noticeable differences. HO
Intake and Cams...very noticeable difference.
- Bernd
>
> Well thanks for clarifying that for me Bernd. I do however feel the 4.7
> would perform better without the stock manifold and the precats.
> Bob, I did not say the PCM stops functioning after 4500 rpm. Its was however
> suggested to that the PCM is not "optimized" for rpms greater than 4500.
> Yes it does make power above 4500rpm but does not pull as strong.
>
> Steve
> '01 RC 4.7 5spd
>
>
> ""Bernd D. Ratsch"" <bernd@texas.net> wrote in message
> news:001301c30d79$0ff42bd0$090aa8c0@homenet.com...
> >
> > Yup...totally agree with Bob on the PreCats. They are not as
> > restrictive as some would think.
> >
> > Two '01 R/T's, both with identical mods (nitrous as well), one with no
> > PreCats and the other with them in tact...1/10th difference in the 1/4
> > mile. (That's nothing)
> >
> > ...and the 4.7's do make power past 4500rpm.
> >
> > - Bernd
> >
> > -----Original Message-----
> > From: owner-dakota-truck@bent.twistedbits.net
> > [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bob Mankin
> > Sent: Sunday, April 27, 2003 9:08 PM
> > To: dakota-truck@dakota-truck.net
> > Subject: DML: RE: Re: Re: 206 cams?
> >
> > 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