Canadian Speedo Reducer

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What is a Canadian speed reducer? I have a Canadian built car and I have bought a dash to convert it back to MPH. So maybe I have one.


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What is a Canadian speed reducer?
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A speed reducer is a device mounted under the hood on the speedometer cable (where there is a fitting to separate both parts of the cable) and it enables you to read MPH's off the KMH (metric) scale. For example if the metric speedo reads 80 (KMH), in reality you're going at 80 MPH. The canadian cars don't have the reducer from the factory, you have to buy it separately.

Claude ;)
 
So your saying all the USA build cars had a Canadian speed reducer installed ?


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It allows an american gn with a 85 mph speedo to use an 145 mph speedo overlay. This way the 145 mph speedo will work properly in my car which i added a 145 mph speedo too.
 
It allows an american gn with a 85 mph speedo to use an 145 mph speedo overlay. This way the 145 mph speedo will work properly in my car which i added a 145 mph speedo too.
Ah, so your just using this to avoid getting the speedo calibrated. Sorry thought I could help but it's sounds like that's not the case. My Canadian built car does not have anything in between the cables. I'm still unclear on what cars came equipped with these.


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i would caution against running an adapter with a chip/lockup/cruise . get the speedo calibrated or just remove the overlay
if you use an adapter with a 145 overlay ....
what the ecu sees will be way off ... reduced around 42%
cruising lockup normally would be at 45 mph with adapter it wont happen until over 63 mph
cruise normally can be activated above 35mph but with adapter it wont be able to be used until around 50mph
also turbo tweak normally switches (drops) the WOT 3rd gear timing based on mph ( 67mph) and with adapter that wont happen until around 95 mph ,
also on TT alky chips there is a street delay on timing to allow time for alky to come in and that doesnt go away and return to full timing until 35mph, with the adapter it will be further delayed until around 50mph
 
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So your saying all the USA build cars had a Canadian speed reducer installed ?


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I'm pretty sure that internally both kinds of speedometers are the same, only the face on them is in MPH's or KPH's. If you look closely at the speedo on a GN sold in the US, there is a smaller row of digits indicating the KMH's below the MPH scale, and in Canada they're just reversed so the metric scale has priority over the miles scale. There never was any reducer installed from the factory.
The only difference is that the odometer in Canada reads KM's instead of Miles traveled. I know this 'cause I have one! ;)

Claude.
 
thats another thing , the reducer for the 145 speedo will also slow down the odometer /trip minder
, true miles traveled will be 42% more than what shows
 
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