The "how many revs are enough" I think really depends on what you are
trying to accomplish:
1) For max acceleration, you want to be able to "maximize the area under
the power curve" when shifting. That is, you don't want to have redline
at peak power, as every time you shift you'll be falling out of the
power band. I haven't looked at the power curve of the stock motor to
see what it looks like, but I think with my 5spd that each gear is
around 1000rpm so you'd want to "maximize" the power under that 1000rpm
segment of the curve.
2) For 0-60 (or quarter-mile), you want enough revs to avoid a "late
shift" just before the magic mark. Most of the cars that run extremely
low 0-60 times for example do it in 2nd gear; given the same power and
weight they would require an extra 0.5 seconds or so to reach 60 if they
did it in 3rd due to the lost time during the shift.
3) For top end, you don't want to run out of revs in top gear (or in the
case of our trucks where it prob. won't pull top gear to redline, more
revs in 4th would produce more speed).
4) For high performance driving, you don't want to run out of revs
forcing an upshift, when you're about to get into some twisty stuff that
will require a downshift almost immediately.
5) When adding enhancements like cam, throttle body, low restriction
exhaust, given sufficient airflow (and fuel) through the motor, more
revs will make more power
Anyway, I agree with what someone else already pointed out; for the
stock motor and the 3.55 rear end crowd, the 5200 rev limiter prob.
isn't too bad. For pulling, etc., I doubt anyone pulls at redline anyway
so its prob. a non-issue. For us in the "its not a truck, its a sports
car that can carry and tow" crowd and want to improve flow through the
motor, we'd like a bit more in the rev department to help take advantage
of it...
Craig
____________________________________________
Craig Baltzer - Anjura Technology Corp - Ottawa, Ontario
cbaltzer@anjura.com - (613) 727-1411
_____________________________________________
> -----Original Message-----
> From: WillTier@aol.com [SMTP:WillTier@aol.com]
> Sent: Saturday, October 18, 1997 8:08 PM
> To: dakota-truck@buffnet.net
> Subject: Re: DML: rev-limiter; what's the big deal?
>
> In a message dated 97-10-17 01:56:46 EDT, you write:
>
> << Wouldn't it be better to hold the rpms at the peak hp speed >>
>
> The article I read said 10% over peak would be optimum.
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