FreeEMSFred
New member
- Joined
- Nov 2, 2009
- Location
- Kiwiland
Hi all,
When I bought my 92 960 wagon it read lower than the speed we were going by quite a bit, but it also had the wrong size bigger profile tyres on it. I didn't do the math even in my head and put it down to the tyres and then replaced them and forgot about it.
On the way home from the supermarket the other night I got paced by a pig and ticketed for 120kph in 100. I swear I was doing 110 on the speedo, give or take maybe 2kph. It's awkward to keep it at a steady speed without the CC working because it's like 2000 RPM at cruise at 100kph. Same deal in a lower gear at 50-60kph, difficult to not speed even by accident.
So afterward I cracked out a GPS and checked it and 80 was 84 and 110 was 116 and so forth. 116+2 = 118, I guess the cop wasn't too far off, 2-4kph wrong. He said he followed me for 600m and from a distance of 200m directly behind. Anyone with an ounce of physics and math knows that you simply cannot accurately judge subtle speed differences from far away when directly in front or behind with your eyes. Up close, sure, the percent change in distance becomes obvious. The apparent field of view taken up by the car becomes significantly different quickly, etc.
In any case, 111-120 = 20 points and 120 doll hairs so it doesn't make any difference and I already tried to get him to write it out for 110 at the time. So no point in trying to get it changed.
Then on the way home the other night while trying to convince myself to drive at "95-105kph to achieve my usual margin on the motorway I looked at the gas gauge being off the clock high and thought about how I ran it out of gas when the light had only just came on and how the dash/cluster had been replaced by a garage before I bought it and click, is it a 940 cluster?
So assuming it IS a 940 cluster, why is the speedo different? Could be count of slots on the diff carrier, but I doubt it. For odo but not speedo it could be different gears inside the cluster (possible! I know there's 2 for some cars). It could be the electronics tuned differently to the 4 cylinder cars. It can't really be anything else, can it? It's a sine-wave signal to the IC on the board that gets converted to voltage from frequency and moves the needle.
Any insight welcome on either the speed or fuel level thing. I'd like to correct both before I forget again and end up with no license.
Cheers,
Fred.
When I bought my 92 960 wagon it read lower than the speed we were going by quite a bit, but it also had the wrong size bigger profile tyres on it. I didn't do the math even in my head and put it down to the tyres and then replaced them and forgot about it.
On the way home from the supermarket the other night I got paced by a pig and ticketed for 120kph in 100. I swear I was doing 110 on the speedo, give or take maybe 2kph. It's awkward to keep it at a steady speed without the CC working because it's like 2000 RPM at cruise at 100kph. Same deal in a lower gear at 50-60kph, difficult to not speed even by accident.
So afterward I cracked out a GPS and checked it and 80 was 84 and 110 was 116 and so forth. 116+2 = 118, I guess the cop wasn't too far off, 2-4kph wrong. He said he followed me for 600m and from a distance of 200m directly behind. Anyone with an ounce of physics and math knows that you simply cannot accurately judge subtle speed differences from far away when directly in front or behind with your eyes. Up close, sure, the percent change in distance becomes obvious. The apparent field of view taken up by the car becomes significantly different quickly, etc.
In any case, 111-120 = 20 points and 120 doll hairs so it doesn't make any difference and I already tried to get him to write it out for 110 at the time. So no point in trying to get it changed.
Then on the way home the other night while trying to convince myself to drive at "95-105kph to achieve my usual margin on the motorway I looked at the gas gauge being off the clock high and thought about how I ran it out of gas when the light had only just came on and how the dash/cluster had been replaced by a garage before I bought it and click, is it a 940 cluster?
So assuming it IS a 940 cluster, why is the speedo different? Could be count of slots on the diff carrier, but I doubt it. For odo but not speedo it could be different gears inside the cluster (possible! I know there's 2 for some cars). It could be the electronics tuned differently to the 4 cylinder cars. It can't really be anything else, can it? It's a sine-wave signal to the IC on the board that gets converted to voltage from frequency and moves the needle.
Any insight welcome on either the speed or fuel level thing. I'd like to correct both before I forget again and end up with no license.
Cheers,
Fred.