Scott, the race fuel, dry-iced I/C or water/alk injection are directed at
detonation control and once you have enough of any or all three you reach a
point of diminishing returns.
What I was trying to get at with Dave is the idea that you don't just stuff
maximum timing into a S/C motor until you reach the point of detonation.
Certainly using a stock PCM or even worse, a MP PCM with total timing of 32
degrees advance or better is not what you want in a blown app. And in his
case we're talking pump gas making the ability to take lots of timing
advance that much riskier.
In your 408 setup with the race gas etc. you might get a little more than
the 24-26 that I quoted earlier, but even if you could get 32 degrees total
without detonating, it's not likely that you would want to. You'll probably
be peaking that pressure sooner than you want creating "negative torque".
Once the motor is dialed in for A/F and detonation is under control, the
only tweak you want to make for spark advance is "tune for max torque"
whereas some people are think it's OK to just dial more in until just before
it detonates. That's not the right way to go about it.
Bob
> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net
> [mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of Scott
> Quaranta
> Sent: Sunday, July 20, 2003 8:43 AM
> To: dakota-truck@dakota-truck.net
> Subject: Re: DML: RE: Novi-2000 Dyno #'s
>
>
>
> Bob....right again but
>
> there is a "lot" more than 24 degrees available before that
> happens...with
> a cooler charge or better gas..or a little aclky injection
>
>
>
> > From: "Bob Mankin" <bob@coralfarms.com>
> > Reply-To: dakota-truck@dakota-truck.net
> > Date: Sun, 20 Jul 2003 01:27:52 -0700
> > To: <dakota-truck@dakota-truck.net>
> > Subject: RE: DML: RE: Novi-2000 Dyno #'s
> >
> >
> > If anything with an intercooler you reduce the need for
> timing advance.
> >
> > Cooler/denser charge = faster flame travel = less need for advance
> >
> > Keep trying to stuff more timing in there and you start
> working against the
> > piston at the TDC/power stroke area.
> >
> > Bob
> >
> >> -----Original Message-----
> >> From: owner-dakota-truck@bent.twistedbits.net
> >> [mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf
> Of Bernd D.
> >> Ratsch
> >> Sent: Saturday, July 19, 2003 9:29 PM
> >> To: dakota-truck@dakota-truck.net
> >> Subject: RE: DML: RE: Novi-2000 Dyno #'s
> >>
> >>
> >>
> >> To a point...but agree with ya on that one.
> >>
> >> -----Original Message-----
> >> From: owner-dakota-truck@bent.twistedbits.net
> >> [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Scott
> >> Quaranta
> >> Sent: Saturday, July 19, 2003 8:17 PM
> >> To: dakota-truck@dakota-truck.net
> >> Subject: Re: DML: RE: Novi-2000 Dyno #'s
> >>
> >>
> >>
> >> Not With a air to water intercooler.....!
> >>
> >>> From: "Bob Mankin" <bob@coralfarms.com>
> >>> Reply-To: dakota-truck@dakota-truck.net
> >>> Date: Sat, 19 Jul 2003 17:41:00 -0700
> >>> To: <dakota-truck@dakota-truck.net>
> >>> Subject: DML: RE: Novi-2000 Dyno #'s
> >>>
> >>>
> >>> You don't want the full advance that your PCM has on a
> blown motor.
> >>> About 24-26 degress total advance at full boost to develop peak
> >>> cylinder pressures at ~10 degrees ATDC which is about where you'll
> >>> find the Magnum is most efficient. The tendency is to jam as much
> >>> timing as possible and that's not the best approach. You only hurt
> >>> parts, slow down or both.
> >>>
> >>> Bob
> >>>
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: owner-dakota-truck@bent.twistedbits.net
> >>>> [mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of Dave
> >>>> Downing
> >>>> Sent: Saturday, July 19, 2003 2:53 PM
> >>>> To: dakota-truck-moderator@bent.twistedbits.net
> >>>> Subject: DML: Novi-2000 Dyno #'s
> >>>>
> >>>>
> >>>>
> >>>> Got the Novi-2000, GSM headers and Spintech true dual exhaust
> >>>> installed, and dyno'd the setup today. Had to get out of
> >> it early on
> >>
> >>>> the first dyno run
> >>>> due to detonation, pulled 346rwhp/383rwtq. Cranked up the
> >>>> boost retard
> >>>> after that, did a few more pulls to tune the a/f. If I
> can get the
> >>>> detonation under control and get a full run without any
> >>>> retard the guys at
> >>>> the shop were thinking close to 400rwhp/450rwtq, I could live
> >>>> with that :)
> >>>> Guess I'm gonna have to look into some alky injection.
> >>>> There's a few pics
> >>>> on my site at cardomain, I'll get some better ones next week
> >>>> when she's
> >>>> cleaned up.
> >>>>
> >>>> http://members.cardomain.com/bad360rt
> >>>>
> >>>> -Dave
> >>>> '02 FR RC R/T
> >>>> Novi-2000 powered :)
> >>>>
> >>>>
> >>>>
> >>>
> >>
> >
>
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:46:38 EST