Insane speed in german cars... [Maxima] (+ tire slip and stuff)

[amalventano@sc.rr.com (Allyn)]

to somewhat backup robert:
92 maxima se:
cd: .32 (very low)
hp: 190 @ 5600
top end info:
138 mph, 5th gear, 5425 rpm (very close to the hp peak, almost ideal top end
gearing)
throw in a bit of speedo error due to tire slip and his 145 is not unreasonable
at all.

** an important note is that even with an accurate speedo, going for top end
results in increased slip at the driven wheels (due to compliance of the rolling
rubber itself). speedos are linear, but the effect of slip is exponential
(follows effect of wind resistance). at <85 or so, the slip is still small, but
becomes large enough at the limit to throw indicated speed off by as much as
10-15%, depending on the type of tires.

hth
Al


----- Original Message -----
From: "Robert Piwonka" <tpiwonka@ttacs.ttu.edu>
To: <scirocco-l@scirocco.org>
Sent: Wednesday, November 06, 2002 12:48 PM
Subject: RE: Insane speed in german cars... [Maxima]


> Ok let em clarify the downhill section was through a turn as well and top
> speed was not reached there but in the half mile strait following(this was
> flat).  Also this was a maxima se... different engine than just the v6
> maximas.  I feel the speedometer is more accurate than a scirocco one :)
> Maximas are fast cars for those of you who have not ridden or driven in an
> se.
>
> Robert Piwonka
>
> -----Original Message-----
> From: scirocco-l-admin@scirocco.org
> [mailto:scirocco-l-admin@scirocco.org]On Behalf Of Jason
> Sent: Wednesday, November 06, 2002 9:46 AM
> To: Robert Piwonka; scirocco-l@scirocco.org
> Subject: RE: Insane speed in german cars... [Maxima]
>
>
> At 12:16 AM 11/6/2002, Robert Piwonka wrote:
> >I have not been following this topic but since we are talking about top
> >speed a 92 maxima se 5 spd can do 145MPH stock.  This was down hill into a
> >flat staight and assuming the speedo was correct(no reason it shouldn't
> be).
>
> Many speedometers are quite off, and get more so at higher speeds
> unfortunately.... even on new cars with electronics.  C&D actually did a
> nice report about this a few months ago...
>
> The reason is essentially that the law insists that speedometers do not
> read _low_.  They can read up to 7% high up to 85mph IIRC.  That would
> probably mean around 12% high at 120mph, or an indicated 134mph FWIW.
>
> I thought the V6 Maximas were limited to 131mph though... (H-Rated tires)
>
> Either case, top speed downhill doesn't exactly mean "top speed". :)
> Jason
>
>
>
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