Re: 90 MPH at 3000 rpm's in 5th gear

[Pcarselle <pcarselle@worldnet.att.net>]

Orin Eman wrote:
> 
> > I have put 215/60/15's on the car.
> 
> That would make the speedometer read a little lower than it should.
> 
> > I have intended accelerations chip and a K&N filter.
> 
> Doesn't matter.
> 
> > On flat ground in 5th gear at 3k rpm's I'm doing 90 mph.
> 
> Flat, uphill, downhill doesn't matter as long as the clutch
> isn't slipping :)
> 
> > I have driven a 89.5 200 Q and at 3k rpm's I'm doing 80 mph and a friend on
> > the list who has a '87 5ktq says he is doing 80 mph at 3k rpm's.
> 
> 80 mph is more reasonable.
> 
> > My speedometer seems to be correct when I drive by those radar machines on the
> > side of the road.
> 
> At what speeds?
> 
> > (2) or are my rpm's just reading low? (idles at 800 rpm)
> 
> I'd suspect the tach at this point.  You can connect an electronic
> meter at the coil and check its accuracy.
> 
> > (3) Is there anyone else out there with the 10v motor that goes 90mph at 3000
> > rpm's ?
> 
> Not mine.  Probably around 80.
> 
> Another check you can make.  Set the trip computer on average mph and
> reset it.  The next speed it displays will be your current speed.
> You should have a helper to do this BTW.  This speed will be more
> accurate than the speedo since it doesn't involve an analog guage
> with springs which can get tired over time.  (Note you will still
> have the tire size error.)
> 
> I have checked my speedo against mileposts (over at least 5 miles
> at 60mph - mileposts aren't too accurate themselves) and it
> reads between 5 and 10% high!  The trip computer reset gives
> a far more accurate speed for me.
> 
> Orin.
Orin:
You are on the ball...I use same procedure....my speedo is 6 MPH
overstated 
at 65MPH...the instantaneous momentary readout of  the computer is 59/60
mph..
this also checks perfectly with fixed mile markers !
Pablo
1987 5KCSTQ