MoTeC Global Forum

Hi,
I received a friend's map made by a Pro Mapper and found on the logs that the PWM idle valve had a duty cycle (40%) even out of idle, that is to say on boost.
So I looked at idle initial position table and there do is a 40% value there.
Question is... won't boost pressure go out of the idle valve in this way?
What Idle initial position table is for then? NA cars? Other kind of valves?

Thanks

Idle initial position is before any PID or normal values can be used, e.g. during cranking. If the idle valve is feeding from atmosphere then yes it will bleed boost. There is a setting to close it after a certain point.

Rick

Rickrst wrote:Idle initial position is before any PID or normal values can be used, e.g. during cranking.

Isn't this the Normal position table?

You want some initial idle. If boost leakage is a problem then feed the idle valve from a pressure source or use a one way valve. Both are used by OEM and they also open the idle valve more as the speed and throttle increase which stops stalling.