Speedo prob: Inaccurate reading...

[whatdamn]

hi guys,

i tested my speedo just now while cruising on the highway at a relatively constant speed of 80km/h (according to my speedo) however, after noting the time taken to travel 1km at 80km/h which took 53.22 secs (powered by Nokia 6510) which means that i was only going at 67km/h (+/-)5km/h for any uncertain factors. this means that my speedo is almost 20% off what it should be!!!

i've heard of ppl saying that all proton cars come with the speedo tuned that way...but would like to know if others are facing this prob. the car in question is a putra 98/99 model btw.

umm, can i get it tuned back to real world speed at proton/eon or my mech eh?

thanks :)

 

[Yong_5290]

really ar...?

tats y after chnaging 2 lancer dash n meter...when i travel at 80km...it feels like 90/100 4 the stock wira speedo...i was like traveling faster...

 

[munky]

if im not mistaken changing ur rims size will affect the speedometer

 

[whatdamn]

yeah i know that but the change won't be 20% right. stock putras come with 14" so i changed mine to 15" only. anyway, i should be going faster since i'm using bigger tyres according to http://www.miata.net/garage/tirecalc.html but i'm not, in fact i'm goign slower...VERY much slower.

 

[Joeker]

U driving Putra rite?

Did u or the previous owner mess with the speedo (like changin white face panel or removing the needle of speedo)

 

[taqu]

My speedo is also off about 5%. I don't know whether they're any place u can correct ur speedo, but the expensive way to get accurate speedometer reading could be : 1. GPS 2. SAFC ;)

 

[whatdamn]

joeker,
i thought of that too as the dashboard has been removed before by one of the previous owners. but i don't really know if they've tampered with the speedo or not.

taqu,
i think u meant RSM right, not SAFC. umm, anyway not considering those options but looking for a way to calibrate the speedo back to normal. i mean, 20% is alot man!

 

[Joeker]

I think 2,800RPM is about 110km/h on 1.8 gearbox F5M221.

 

[whatdamn]

for 5th gear you mean? i'll check it out tmrw and post it back here. thanks :)

 

[deluxe]

anybody send their car to puspakom to reconfirm the speedometer reading? i believe they can check it for you.

 

[whatdamn]

ok thanks. :)

 

[lix]

Ya loh... i also face the same problem last time. When i'm travel at 160kmh, i was over took by my friend honda which only travel at 140kmh. Nothing can do to correct this matter, i just change the tyre from 185/60/14 to 185/70/14 to sub-set the reading but i suffer the slower pickup loh...

How come Proton can't do anything about this?
Imagine you will spend more especially on oil change intervals and timing belts cos the odometer will indicate the mileage that we travel. shown 85,000km, actual 65,000km. Shown 5000km, actual 4500km. WTF

 

[whatdamn]

oh well.

 

[simon]

out from proton factory the speedo reading is accurate...but things like changing to bigger diameter tyres , changing the meter face panel which requires pulling out the needle or changing the meter to that of other cars, spoilt meter gears are some factors which renders unaccurate meter reading.....its very difficult to recalibrate the meter especially if the needle has been removed & fixed back because the meter coiling would have run off.....upgrading to bigger rims is also the cause....if from 175/70R13 to 185/60R14 or 195/50R15 the meter reading would not be effected much....the best way to compare is run alongside with the same model car as yours which has not been "touched" at all & quite new........

i have one doubt....a kancil , a mercedes , a wira , a motorbike running at 130km/h .....would they be all running "alongside" or the merc would be ahead & the kancil the last eventhough their respective meter show 130km/h....say that all their meters are in perfect condition........and also say the police have mounted a speed trap ahead.....would all of them be fined or only some ???

 

[taqu]

Yea sorry, it should be RSM :p

 

[Jackie Leong]

out from proton factory the speedo reading is accurate...but things like changing to bigger diameter tyres , changing the meter face panel which requires pulling out the needle or changing the meter to that of other cars, spoilt meter gears are some factors which renders unaccurate meter reading.....its very difficult to recalibrate the meter especially if the needle has been removed & fixed back because the meter coiling would have run off.....upgrading to bigger rims is also the cause....if from 175/70R13 to 185/60R14 or 195/50R15 the meter reading would not be effected much....the best way to compare is run alongside with the same model car as yours which has not been "touched" at all & quite new........

i have one doubt....a kancil , a mercedes , a wira , a motorbike running at 130km/h .....would they be all running "alongside" or the merc would be ahead & the kancil the last eventhough their respective meter show 130km/h....say that all their meters are in perfect condition........and also say the police have mounted a speed trap ahead.....would all of them be fined or only some ???

i doubt the 4 vehicles would be running alongside each other.. not good with explaining, but that's just my opinion.

if all of the cars are travelling at their actual speed 130km/h which is above the speed limit and coming across a speed-trap camera mounted by traffic police, i'm pretty sure all of them will fined..

 

[whatdamn]

:S

hai lat...gotta get rsm ar hahah.