Shift advisory lights

Decided to fit another box of electronics made by a company called DRE (Digital Race Electronics). It is a computer that works out when to change up gears called an SDL5 Sequential Shift Light. The box measures 58mm x 16mm x 35mm and the idea is you are to mount it in your direct line of sight. This should avoid the potentially detrimental dependence of the rev limiter. It also wastes track seconds going into the rev limiter. I spotted this shift light box on a car at Doune this year.

The box worked well when directly connected to the Hayabusa ECU rev counter drive cct but refused to work with ETB rev counter connected to the same wire. I scratched my head and went back to basics with my electronics knowledge and made a cct that allows both to co-reside. The ETB rev counter appears to put a 5V offset in the ECU circuit when connected. I basically removed that offset with a capacitor resistor and diode to protect the DRE unit. The values of the capacitor and resistor are not that critical being 33uF and 2.2Kohm. If you require more details mail me, I doubt this is a common problem.

10/06/14: The signal to the unit was correct as designed above, however the setting for "Cylinders" should have been 2 to match the ECU signal of one pulse per rev. Now working fine.

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