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The mkiv Supra Owners Club

Red led convertion dash


trinitom
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I did red last year but I've just changed to blue. I really liked red as my audi was the same but it just didn't look right on the supra, plus the bulb adaptor efforts that you put in the back of the speedo only half worked, I soldered led's straight to the board this time and its much better.

 

If you do go for blue make sure you get normal blue led's and not ultrabrights like me as I had to sit for ages trying to find resistances that would bring the led's down to acceptable levels that didn't blind you when driving.

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If I wanted to do a red LED conversion, will I have to use zeners and resistors with different values to what are used with the blue conversion?

 

 

No, most led's have a forward operating current of 20mA, the only difference between blue led's and red led's is that the majority of blue one's you see on ebay etc, are ultrabright's (7-9000mcd) and at the same current they produce a hell of a lot more light and it dazzles you at night.

 

You will only need one zener and thats only if you want to change the brightness of the led's when you switch your headlights on. I actually used a 6v8 zener (i think) which is a lot higher than you'd usually want as my blue led's where so bright that I had to run them at 2-3mA with the headlights off just so they wouldn't blind me. I used a higher value diode so that they were not to dim when the headlights where on.

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