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The mkiv Supra Owners Club

Auto speedo to 6 speed box


TT Paul

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Which diff you got? If you have the Euro/UK/Jdm 6-speed diff, your speedo readout would be correct. If not, maybe one of these would do the trick: http://www.supraforums.com/forum/showthread.php?671481-Installing-a-Yellowbox-V4-speedo-corrector-in-a-Supra-MKIV-SC

 

Here is the straight link for the Yellow box: http://www.yellr.com/index.htm

 

Hope this helps! :thumbs:

Edited by Mika (see edit history)
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Ye I'm also running auto diff that's the problem. The yellow box is a good idea though

 

Just check the yellow box will work mate, as I was reading through the website and noticed in the diagrams it shows it converting a square wave speed signal. I'm pretty sure the speed signal into the Supra speedo is a sine wave, then the speedo converts it to a 4 pulse square wave, which then goes to the ECU. It may not matter, but best to check.

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Just check the yellow box will work mate, as I was reading through the website and noticed in the diagrams it shows it converting a square wave speed signal. I'm pretty sure the speed signal into the Supra speedo is a sine wave, then the speedo converts it to a 4 pulse square wave, which then goes to the ECU. It may not matter, but best to check.

Always something else to check. So a manual speedo won't work then due to ratios being different looks like the yellow box maybe the option as long as it will work.

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It's the Auto Diff Ratio's that cause the miss read Paul, I have the same problem with a Manual Speedo Cluster

 

Let me know if you try the Yellow Box and it works, as I am not overly bothered by it, but if it's a simple plug and play, I might as well just do it ;)

Cool thanks rog saves me buying manual clocks will get a box when I find a job lol. There's a V3 box on eBay but says it's for bikes might get one on a punt

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At the moment I think I've the same problem. Though I need to play with the needles as they don't seem to work correctly. It read's 10ish mph over. My gears seem short so think I have a UK spec large auto case diff.

 

And the temp gauge reads slightly over too.

 

Let us know how the yellow box goes.

Edited by Hitbox Junkie (see edit history)
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At the moment I think I've the same problem. Though I need to play with the needles as they don't seem to work correctly. It read's 10ish mph over. My gears seem short so think I have a UK spec large case diff.

 

And the temp gauge reads slightly over too.

 

Let us know how the yellow box goes.

Glad I asked now not the only one it seems.

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  • 2 weeks later...

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