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Registered:
May 2002
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 Help - How to correct speedometer reading after conversion?
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Sun, 03 October 2004 13:26
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Has anyone had this problem after an engine or gearbox conversion ?
I put a 1ggte and gx81 box into my RA65 celica (4 cyl) and the speedo reading is about ... 10km/h slower i.e. driving at 50km/h is actually 60km/h ... or approximately 15% slower ..
How have you fixed it ... im happy to just drive it as is because i can just go with the flow of traffic, but its an issue when I am driving late at night when i am on the road alone ..
Any ideas / ways of fixing ?
thanks !
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Help - How to correct speedometer reading after conversion?
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Sun, 03 October 2004 13:43
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You can swap the speedo gears around for the correct ones - I presume the GX81 box is a W58? Get the speedo gear set from an RA65 W57.
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Registered:
May 2002
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Re: Help - How to correct speedometer reading after conversion?
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Sun, 03 October 2004 17:41
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hmm sounds easy enough
can u run me through what to do ?
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Location:
Sydney
Registered:
May 2004
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Re: Help - How to correct speedometer reading after conversion?
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Sun, 03 October 2004 23:45
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get under the car and find where the speedo cable connects to the box. there should be a 10mm bolt or something like that holding the drive gear in. Undo the bolt yank the drive gear out grab a pan to catch the oil then wack in the new drive gear, do up the bolt and connect the speedo cable. done and done.
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Location:
Brisbane
Registered:
May 2002
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Re: Help - How to correct speedometer reading after conversion?
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Mon, 04 October 2004 03:45
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If you do a search, you'll find a good thread where this has been talked about b4!
There are obviously 2 gears (one on the output shaft of the gearbox and the one that you bolt in).
Not sure how well it will go if you change the other gear to a ra65/w57 if the inner gear is different?
Cheers
Wilbo
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Registered:
May 2002
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Re: Help - How to correct speedometer reading after conversion?
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Wed, 06 October 2004 01:59
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umm what are the chances of my speedo reading MPh as opposed to KMh ??
60 kmh on my speedo is equivalent to about 100 KMh in other cars ...
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Toymods Club Treasurer
Location:
Sydney
Registered:
May 2002
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Re: Help - How to correct speedometer reading after conversion?
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Wed, 06 October 2004 02:35
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You could also change the diff ratio or put bigger tyres on.
But this is probably the expensive way to do it.
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Location:
Brisbane
Registered:
January 2005
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Re: Help - How to correct speedometer reading after conversion?
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Wed, 19 January 2005 05:28
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I think my car has the same prob. I just bought it and its still in Japan but its a Celsior (LS400) with a 2JZ conversion. It has an aftermarket rev/speed meter but ideally i would like the speedo to be correct. Would changing this be as easy as stated above or am i looking at a massive job which isnt worth undertaking? Im willing to put in a bit of time to get it done as a working speedo would make the car feel a whole lot more complete that one that doesnt work. I test drove an R33 Skyline that had an Infinity Q45 V8 conversion and its speedo was way out. It was quite off-pissing...
Anyways i would appreciate any advice.
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Location:
Brisbane
Registered:
May 2002
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Re: Help - How to correct speedometer reading after conversion?
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Wed, 19 January 2005 05:51
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jaycar sell a small kit to alter the digital pulse output from the electronic speed senders in the later toyota boxes. I was going to use one for the R154 behind the 1J in my chaser, but I was lucky and the speedo reading is almost perfect.
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Location:
brisbane
Registered:
October 2004
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