Speedo for SVA
Discussion
splatspeed said:
speedo has to be at or under speed you are doing and within 10 %
that is the usual rule of thumb on the road
that is the usual rule of thumb on the road
I know of some one who failed the SVA in his Tiger when his peedo read 1MPH over. He was told going under was fine but over was not allowed. maybe just a nasty SVA guy on a bad day off
remal said:
splatspeed said:
speedo has to be at or under speed you are doing and within 10 %
that is the usual rule of thumb on the road
that is the usual rule of thumb on the road
I know of some one who failed the SVA in his Tiger when his peedo read 1MPH over. He was told going under was fine but over was not allowed. maybe just a nasty SVA guy on a bad day off
Probably Southampton.
Steve
Hang on, I'm either going mad here or misunderstanding what you're all saying. I thought a speedo could overread by up to 10% (ie it says 33 and you're actually doing 30), but it must not underread at all.
Having it underread would be bad for your licence as you get pinged by every speed camera thinking you're at the limit... Not to mention the obvious danger of actually travelling at 33mph when you think you're doing 30
Having it underread would be bad for your licence as you get pinged by every speed camera thinking you're at the limit... Not to mention the obvious danger of actually travelling at 33mph when you think you're doing 30
steve_d said:
remal said:
splatspeed said:
speedo has to be at or under speed you are doing and within 10 %
that is the usual rule of thumb on the road
that is the usual rule of thumb on the road
I know of some one who failed the SVA in his Tiger when his peedo read 1MPH over. He was told going under was fine but over was not allowed. maybe just a nasty SVA guy on a bad day off
Probably Southampton.
Steve
I take it that means Southampton is possibly not the best place to take a car for SVA then?!
For SVA they can OVER -read by 10% + 6.25 MPH. They are not allowed to UNDER-read at all. If it really failed for over-reading, ask for an appeal form! It must also be marked at intervals of not more than 20 MPH up to the maximum speed of the vehicle and must be capable of being read at night.
The Single Vehicle Approval Inspection Manual - Draft said:
20 Speedometer
Procedure and Standards
1. Check that a speedometer is fitted and is capable of indicating the vehicle speed in miles per hour (mph) at uniform intervals not exceeding 20mph for all speeds up to the maximum design speed of the vehicle.
NOTE 1: Both the increments and units of measurement eg mph, m/h must be displayed.
NOTE 2: It is acceptable if the maximum speed of the vehicle is indicated by the last increment on the speedometer which must not be more than 19mph beyond the last 20mph increment.
NOTE 3: It is acceptable for the speedometer needle "rest" position to be between the zero position and first marked increment.
Reasons for Failure:
A speedometer
• not fitted
• inoperative
• does not indicate the speed in mph
• indicates speed at intervals exceeding 20mph
• not capable of recording speeds up to the vehicle maximum design speed.
2. Check that the speedometer is capable of being read at all times of the day or night, eg by illumination.
NOTE: Temporary obstruction by the steering wheel is acceptable.
Reasons for Failure:
A speedometer not capable of being read at all times.
3. Where the accuracy of the device is in question, and with the vehicle positioned on, or fitted with a speed measurement device, operated to the manufacturer’s instructions, drive the vehicle at a stable speedometer indicated speed of 35mph and note the true speed. Compare the indicated speed recorded with the true speed. Repeat the test at various speeds, as necessary to confirm compliance.
The speedometer must not indicate a speed less than the true speed.
At speedometer indicated speeds between 35mph and 70mph (or the maximum design speed if lower) the true speed must not be less than that shown in the following table.
Min True - Indicated
Speed - Speed
(mph - (mph)
26 - 35
30 - 40
35 - 45
39 - 50
44 - 55
48 - 60
53 - 65
57 - 70
Reasons for Failure:
A speedometer indicates a speed
• which is less than the true speed of the vehicle
• in excess of the true speed plus the permitted tolerance.
NOTE: If for a given indicated speed the true speed is less than the minimum requirement shown in the table this confirms that the recorded speed is in excess of the true speed by more than the permitted tolerance calculated by the equation
true speed/10 + 6.25mph
NOTE: Where the accuracy of the speedometer cannot be measured on the equipment available, the vehicle presenter may be required to provide documentary evidence of compliance.
Procedure and Standards
1. Check that a speedometer is fitted and is capable of indicating the vehicle speed in miles per hour (mph) at uniform intervals not exceeding 20mph for all speeds up to the maximum design speed of the vehicle.
NOTE 1: Both the increments and units of measurement eg mph, m/h must be displayed.
NOTE 2: It is acceptable if the maximum speed of the vehicle is indicated by the last increment on the speedometer which must not be more than 19mph beyond the last 20mph increment.
NOTE 3: It is acceptable for the speedometer needle "rest" position to be between the zero position and first marked increment.
Reasons for Failure:
A speedometer
• not fitted
• inoperative
• does not indicate the speed in mph
• indicates speed at intervals exceeding 20mph
• not capable of recording speeds up to the vehicle maximum design speed.
2. Check that the speedometer is capable of being read at all times of the day or night, eg by illumination.
NOTE: Temporary obstruction by the steering wheel is acceptable.
Reasons for Failure:
A speedometer not capable of being read at all times.
3. Where the accuracy of the device is in question, and with the vehicle positioned on, or fitted with a speed measurement device, operated to the manufacturer’s instructions, drive the vehicle at a stable speedometer indicated speed of 35mph and note the true speed. Compare the indicated speed recorded with the true speed. Repeat the test at various speeds, as necessary to confirm compliance.
The speedometer must not indicate a speed less than the true speed.
At speedometer indicated speeds between 35mph and 70mph (or the maximum design speed if lower) the true speed must not be less than that shown in the following table.
Min True - Indicated
Speed - Speed
(mph - (mph)
26 - 35
30 - 40
35 - 45
39 - 50
44 - 55
48 - 60
53 - 65
57 - 70
Reasons for Failure:
A speedometer indicates a speed
• which is less than the true speed of the vehicle
• in excess of the true speed plus the permitted tolerance.
NOTE: If for a given indicated speed the true speed is less than the minimum requirement shown in the table this confirms that the recorded speed is in excess of the true speed by more than the permitted tolerance calculated by the equation
true speed/10 + 6.25mph
NOTE: Where the accuracy of the speedometer cannot be measured on the equipment available, the vehicle presenter may be required to provide documentary evidence of compliance.
Edited by flossythepig on Tuesday 27th June 08:28
Flossythepig..........seems clear but Avocet mentions the readings on the guage
should go past the legal limit of 70pmh up to the Maximum
of the car.
It does not mention Maximum on your text
Can you confirm?
I was wanting my gauge to have 30 50 and 70mph marked with divisions for 10/20/40/60
and that is all
The above is housed in a Scimitar Speedo housing fitted with a RangeRover speedo head and my TVR bezel. This lot is connected to a Rover 5-speed gearbox by the new speedo cable (origianlly it had an electronic speedo and I had problems with the speed sensor)
The now spray painted blank face is Magnolia to match the other dials
I was going to mark the speeds on the dial (letraset)after a couple of trial runs on a 'quiet' road with help
This should at least make it accurate with the axle/tyre gearbox combination
289 said:
Flossythepig..........seems clear but Avocet mentions the readings on the guage
should go past the legal limit of 70pmh up to the Maximum
of the car.
It does not mention Maximum on your text
Can you confirm?
I was wanting my gauge to have 30 50 and 70mph marked with divisions for 10/20/40/60
and that is all
should go past the legal limit of 70pmh up to the Maximum
of the car.
It does not mention Maximum on your text
Can you confirm?
I was wanting my gauge to have 30 50 and 70mph marked with divisions for 10/20/40/60
and that is all
Unfortunately.
The Single Vehicle Approval Inspection Manual - Draft said:
1. Check that a speedometer is fitted and is capable of indicating the vehicle speed in miles per hour (mph) at uniform intervals not exceeding 20mph for all speeds up to the maximum design speed of the vehicle.
Unless the designed maximum speed is under 89mph you will need more marks.
Hugh
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