When To Turn On EVAP Valve for Charcoal Canister

[Panici]

I am still using the original E30 charcoal canister and EVAP valve in my swap car.
The valve is controlled by my standalone ECU.

Previously I had it energized when RPM < 2000 and TPS > 15.
Although I never have fuel smell issues, I recently opened this window up to RPM < 2500 and TPS > 5.

My thought was to burn off accumulated fuel in the canister at the least obtrusive time. Obviously this means keeping it closed in boost. But should it be open under normal driving and in cruise?

Does anyone know how the valve is controlled from the factory M52B28 ECU?

Cheers!

[TobyB]

Not sure about that particular engine, but I recall evap usually only purges when the engine's in overrun, and
then occasionally at idle. I remember being surprised at how LITTLE the stock systems draw through it.

funny the things you remember, when you can't even remember your R3v login...

t

[nando]

That's what I recall. you only open the valve when you lift the throttle, and generally only at higher RPM. I'm pretty sure that's how I set up mine.

[Panici]

Not sure about that particular engine, but I recall evap usually only purges when the engine's in overrun, and
then occasionally at idle. I remember being surprised at how LITTLE the stock systems draw through it.

That's what I recall. you only open the valve when you lift the throttle, and generally only at higher RPM. I'm pretty sure that's how I set up mine.

So pretty much high vacuum areas (overrun and idle) and not under load.

Thanks guys!