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RPM in Road Speed
Posted: 28 Mar 2019, 13:18
by chriscburgess
1.9dg 5 speed
my speedo cable has just broken and I am going away tomorrow in the van. Does anyone know if there is a chart somewhere which correlates RPM in road speed for each gear so that i can at least try to keep in the speed limit - LOL!
e.g. 2000rpm equal 40 mph in 5th etc. (this is probably not true but just an example of what i am looking for.
Thanks
Also where is the best place to get a new cable and how easy is it to fit please?
Chris
Re: RPM in Road Speed
Posted: 28 Mar 2019, 14:05
by bigherb
It depends on the gearbox and tyre size but early boxes where around 15mph in 4th and 18mph in 5th per 1000rpm.
Cables are usually made by the same company Gemo so whoever is the cheapest with postage.
Check first if you have the screw on end to the instruments or the clip on end.
Straight forward to fit make sure the seal in the back of the stub axle is a tight fit, and seal the end where it comes through the grease cap with sealant, the cable should curve down away from the stub axle so water runs away from the stub axle.
Re: RPM in Road Speed
Posted: 28 Mar 2019, 14:27
by chriscburgess
Fantastic Thanks!
Its a 1984 on standard wheels and tyres so i guess it is an early box.
I'll stick a post it note on the dash.
Cheers!
Re: RPM in Road Speed
Posted: 29 Mar 2019, 23:26
by nesty
bigherb wrote:It depends on the gearbox and tyre size but early boxes where around 15mph in 4th and 18mph in 5th per 1000rpm.
Cables are usually made by the same company Gemo so whoever is the cheapest with postage.
Check first if you have the screw on end to the instruments or the clip on end.
Straight forward to fit make sure the seal in the back of the stub axle is a tight fit, and seal the end where it comes through the grease cap with sealant, the cable should curve down away from the stub axle so water runs away from the stub axle.
Been on a trip recently and I noted about 65mph I was doing around 3,300rpm. Mine is a 4 speed with 16' wheels though!
Re: RPM in Road Speed
Posted: 31 Mar 2019, 20:19
by mike9009
Hi
Could you use your phone and some GPS tracker to display your speed accurately? I use HERE Maps which is free and you can download maps (so saves data usage). Displays your current speed at all times.
Mike
Re: RPM in Road Speed
Posted: 03 Apr 2019, 16:31
by chriscburgess
mike9009 wrote:Hi
Could you use your phone and some GPS tracker to display your speed accurately? I use HERE Maps which is free and you can download maps (so saves data usage). Displays your current speed at all times.
Mike
yes good idea. apparently Waze does the same.
I actually had chart taped to the dash with the relevant rpm and mph on for the weekend but have now manged to replace the cable.
Re: RPM in Road Speed
Posted: 04 Apr 2019, 05:39
by F-i-s-z
U can use Google maps app. Download velociraptor app and this app will display speed limits and your actual speed. Using every day in my westy.
20190404_063824.jpg
Sent from my SM-G950F using Tapatalk
Re: RPM in Road Speed
Posted: 04 Apr 2019, 09:17
by Ian Hulley
Replace the speedo cable ... 20 minute job.
Ian