Re: Speed

[ejfluhr@austin.ibm.com (Fluhr)]

>I need some help with this scenario:  Put a speedo/tach
>head from an 84 CGT into my 84 4ks (no Q), am running 
>195/60/14 series tires and failed to realize that I prolly
>srewed things up even more (at least the speedo works, 
>now).  Question is, am I going faster or slower?  By the way
>the car feels/sounds it seems that the tach is close but it 
>can't be, can it?  

My guess is that the tach is displaying 4/5 of what the actual
engine speed is.  Both tachs should take their reading from the negative
terminal of the coil, so your coil is sending 4 pulses for every rpm
when the tach expects 5...hence 4/5.

Not sure about the speedo.  After talking with Tony Lum, I gather
the speedometers are geared for a particular transmission type.  If
the 4K speedometer and CGT speedometer are geared differently, then
you are likely to be off by that difference.

Later,
Eric
'85 Coupe GT
---
Eric J. Fluhr                                Email:  ejfluhr@austin.ibm.com
630FP Logic/Circuit Design                   Phone:  (512) 838-7589
IBM Server Group                             Austin, TX