The GPS is good if you can maintain the speed for a minute or so. Depends
on signal strength. The GPS in my work van right now shows a top speed of
141 MPH...Not likley. It must have been in a fringe area and suddenly
decided it was "x" from where it's last good fix was "y" seconds ago, and
it's little brain did the math.
One real good way is to get your odometer calibrated by the mile markers
over maybe 10 or 20 miles, longer the better, at normal speed,this will give
you speedo error at the mid range. Then get up to maybe 3000rpm,same range,
and look at the speedo and work out the RPM vs MPH ratio. If there is no
clutch slippage, this is about 100% accurate on a manual trans.
Other end of the spectrum from Roadsters, I had a 340 Dodge Dart, 4 speed
manual, so no slippage, that turned 2000 rpm @45 mph, so 22.5 mph/1000rpm.
I had it up to 7000+ rpm in 4th on night, pretty sure it was over 7200, and
the only working dash light ws the tach, so I did the math later. 7000 works
out to 157.5, 7200 is 162 etc. Wondered why the Z28 in the other lane was
dropping back so fast. Bad idea on Bias ply tires, but that's when I was
young and imortal.
Dave Brisco
ECR
-----Original Message-----
From: Gary and Cindy Ault [mailto:aultgc@att.net]
Sent: Saturday, March 01, 2008 1:14 PM
To: Mike H.; datsun-roadsters@autox.team.net
Subject: Re: [Roadsters] Passed 100mph for the first time!
Mike,
Is the 102 mph based on your speedo, or GPS? I hate to tell you this, but,
at one time, my speedo was so far off it was reading 100 when I was doing
only 75.
I have had three different speedos in my '66, and I have given up trying to
get them calibrated. I drive by the tach: 4000 rpm in 4th, 78 mph. That's
with a 4-speed and the correct pinion. My wife gave me a GPS for Christmas,
and I plan to "calibrate" things with that device when the weather improves.
I'd be interested in hearing other's experiences with stock Nissan speedos
for early (or late) cars.
Gary Ault
----- Original Message -----
From: "Mike H." <twobeaners@earthlink.net>
To: <datsun-roadsters@autox.team.net>
Sent: Saturday, March 01, 2008 10:14 AM
Subject: [Roadsters] Passed 100mph for the first time!
> The subject says it all!
>
> Well not quite............... Zoweeee!
> Sheeeeeeeeeeeee........tttt!!!!!!
> 2375
> miles on the new stroker, hope it liked it 102 mph. She was screamin', but
> I
> think it was from pleasure not pain! Oh wait! maybe that was me!
>
> Can anyone tell I'm havin' a good time? 65 degrees in KC today!
>
> Later, got go for another Zoomie!
>
> Mike Hudson '67 - Stroker / 5-speed
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