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Speedo is waaaaay out!!!
Posted: Fri May 22, 2009 10:47 am
by Going_up
i'm a little cunfused...
i bounght a my lux not too long ago and thought i was driving too fast everywhere.
any, decided to put the gps into her last night and noticed the speedo was 15km's out startin @ 40km/h
so if i was doing 55km/h on the speedo i was actualy doing 70 ish..
it got me really confused cause it's only got 31's on her. they only think that i might think it is, is that she had a grar box change. but i can't think that would change anything??
diff's are standard, that i know of...
Posted: Fri May 22, 2009 11:08 am
by Jacked
has the speedo been changed for bigger tyres?
Posted: Fri May 22, 2009 11:09 am
by Going_up
not that i know of.
i didn't think 31's would make that much a differance
Posted: Fri May 22, 2009 11:19 am
by Jacked
well if the speed drive has been calibrated for 35's it would be very close to the speed the speedo is showing
Posted: Fri May 22, 2009 12:19 pm
by thehanko
Jacked wrote:well if the speed drive has been calibrated for 35's it would be very close to the speed the speedo is showing
31's to 35's is only a 13% change so 6.5km at 50kph.
and hiluxs tend to overstate their speed normally, so once you go to 33's they are pretty much spot on.
it could still be the issue but its seems too far out. what modle lux is it?
Posted: Fri May 22, 2009 12:45 pm
by Going_up
it's a 1993 dual cab 2.8 oil burner ln106.
it's got me buggered why ti's out.
my only guess is that the diff centers have been changed
Posted: Fri May 22, 2009 1:26 pm
by Jacked
i dont think diff centers would change it 20 k at 50kph. (it should read 3-8k's higher then the speed you really doin)
Posted: Fri May 22, 2009 3:09 pm
by hilux79
Maybe put what revs you are doing at 100kph by the GPS not the speedo. Should be able to tell if it is gears or the speedo then. It should have an electronic pick-up not cable driven speedo in it. I think Marks make a box to adjust them.
To give you an idea my 92 LN106 is 7kph out at 100 so just over 90 on the speedo is 100kph. That is on 33's
Posted: Fri May 22, 2009 3:16 pm
by thehanko
Going_up wrote:it's a 1993 dual cab 2.8 oil burner ln106.
it's got me buggered why ti's out.
my only guess is that the diff centers have been changed
doesnt make sence at all. unless your running like 3.1 diffs it would not put your speed that far over, as they are normally slower than indicated not faster.
my 4.3 diffs 2.8 ln 106 sits on 2450 at indicated 100km/h on 31's
It could be a faulty speedo, as in something inside the chip is sick, but even then i would have thought it would just stop working.
Posted: Fri May 22, 2009 3:48 pm
by Going_up
yeah it beats me,
the tacho is going 2900rpm @ 100km/h but really i'm doing like 120ish according to the gps
Posted: Fri May 22, 2009 3:59 pm
by thehanko
Going_up wrote:yeah it beats me,
the tacho is going 2900rpm @ 100km/h but really i'm doing like 120ish according to the gps
sounds like its set up for 4.88s then or lower.
I do 2900- 3000 at 120 so your diffs are still stock 4.3's, but the speedo thinks you have 4.88s or even 5.1s.
it must have a correcter box in it somewhere which was set up for a previous life.
Posted: Fri May 22, 2009 4:02 pm
by Going_up
well at least on the upside, when i do put 4.88's i wont have to worry about the speedo
Posted: Fri May 22, 2009 4:09 pm
by thehanko
Going_up wrote:well at least on the upside, when i do put 4.88's i wont have to worry about the speedo
just to confirm though, is it 20km out the whole way up? or 20% it should be % to be a gearing issue.
if it is 20%
then 4.88's will bring you back to 6% out. but on the dangerous side.
going to 33s will kick it back up to 12% out.
still cant get my head around why its so far out.
Posted: Fri May 22, 2009 4:14 pm
by Going_up
thehanko wrote:Going_up wrote:well at least on the upside, when i do put 4.88's i wont have to worry about the speedo
just to confirm though, is it 20km out the whole way up? or 20% it should be % to be a gearing issue.
if it is 20%
then 4.88's will bring you back to 6% out. but on the dangerous side.
going to 33s will kick it back up to 12% out.
still cant get my head around why its so far out.
the differance gets bigger the faster i go.
starts at about 10km out at 25km/h and keeps going up from there
dont worry, it's got me beat too
Posted: Sat May 23, 2009 6:55 am
by grott
our 2wd utes at work are doing 3000RPM @100kph. Is it possible it is a 2wd speedo set up
Posted: Sat May 23, 2009 8:04 am
by Bastler
Are we sure the GPS is not out. I have been told that the speed they show can be very incorrect.
Posted: Sat May 23, 2009 9:50 am
by berad
Ussually gps's are relatively close, navmans etc i wouldnt expect to be 100% though.
My Garmin gps is almost spot on.
Mine does 2900-3000 at 100 by the gps in 5th with 31s and 4.88s
2400-2500 at 100 by gps with 35s and 4.88s
I dont know, i have nothing haha.
Posted: Sat May 23, 2009 9:57 am
by thehanko
Going_up wrote:thehanko wrote:Going_up wrote:well at least on the upside, when i do put 4.88's i wont have to worry about the speedo
just to confirm though, is it 20km out the whole way up? or 20% it should be % to be a gearing issue.
if it is 20%
then 4.88's will bring you back to 6% out. but on the dangerous side.
going to 33s will kick it back up to 12% out.
still cant get my head around why its so far out.
well at least if its ever increasing with speed we know it is gearing related .
the differance gets bigger the faster i go.
starts at about 10km out at 25km/h and keeps going up from there
dont worry, it's got me beat too
Posted: Sat May 23, 2009 10:28 am
by Bastler
I believe my Tom Tom GPS is out. As my Hyundai speedo says Im at 100 the GPS says I am at about 93. I have not really checked but based on the rest of the traffic the speedo seems correct.
Its a 2000 Hyundai so I wouldn think that it would be out by that much mind you it is a Hyundai.
Posted: Sat May 23, 2009 12:11 pm
by Jacked
Bastler wrote:I believe my Tom Tom GPS is out. As my Hyundai speedo says Im at 100 the GPS says I am at about 93. I have not really checked but based on the rest of the traffic the speedo seems correct.
Its a 2000 Hyundai so I wouldn think that it would be out by that much mind you it is a Hyundai.
The difference sounds normal.
Posted: Sat May 23, 2009 12:17 pm
by thehanko
Jacked wrote:Bastler wrote:I believe my Tom Tom GPS is out. As my Hyundai speedo says Im at 100 the GPS says I am at about 93. I have not really checked but based on the rest of the traffic the speedo seems correct.
Its a 2000 Hyundai so I wouldn think that it would be out by that much mind you it is a Hyundai.
The difference sounds normal.
hyundais are one of the worst for speedo inaccuracy, all speedos standard read as faster than they actually are, so they can never be blaimed for tickets and high speed accidents etc.
GOING Up you need to talk to this guy. he needs your probelm and you need his
http://www.outerlimits4x4.com/ftopic174747.php