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Summary of change:
'''STVA Secondary Throttle Valve Adjustment''' In shop ordercomment add "Please instead of internal DBW, add additional 2A 4-wire bipolar stepper driver controlled from some ECU PWM output". (same price as internal DBW bridge, select that for price). Suzuki GS-F 650/1250 (ccm3) ---- '''Secondary Throttle Valve''' * '''2A 7 Ohm bipolar 4 wire stepper for intake pipe cross-section area control''' * 256 steps enough? No, appr. 1200 steps ** or more steps needed? Please check if available. We'll see * step down to 0 (actually fully up?) at powerup/ Ignition ON->full open-> set 15% position before/during start (as set for 0 RPM) * step to command position after that (PWM input or digital input) '''Current and Power... Each coil is 2A * 13V = 26W... The stepper total dissipation is 2 x 26W > 50W stepper that must NOT be powered continuously... IT WOULD OVERHEAT''' * stepper must be powered DOWN when it reaches target, or better: lower (appr. 0.5A 7W/coil) holding current should be applied... ** Appr 30..50% current should prevent premature damage to throttle stepper motor '''Analog input 0.5V .. 4.5V (supplied from 5V)''' * '''0.5V .. 4.5V''' * mcp3208 analog input for logging. ---- '''6+2 IGBT''' * 2 ignition recommended: EC36/34,36 (ch2,3) Wasted spark. * power ign outputs: 4 free remaining * logiclevel ign output controls "Boost PWM" => STVA throttle-stepper position (available on EC36/pin... while also commanding the throttle controller) * 1 logiclevel ign => stepper wire (2A) original trace cut * 3 p259 EC36pins => stepper wires (2A) original trace cut ** colors: GW, ** colors: PY * EC18/pin1 mcp3208ch0 throttle feedback (TPS2). Can also be logged by v3 main processor ---- 2ns RS232 not needed, (1 RS232 on EC18/14-15... standard)
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