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Simple evap system control with megasquirt

 
Old 03-28-2019, 11:40 AM
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Default Simple evap system control with megasquirt

I have an NB2 with ms3 pro Evo. The car has an engine swap, but that's irrelevant to this topic, and it's boosted. I want to do something with my evap system. It's a street and track car.

Removing the entire system means building pressure in the gas tank, and drilling a hole in the gas cap means sloshing gas onto the track.

Moving to a simple breather under the car means being a bad person and killing penguins.

I'd like to do some kind of simple evap system that could keep the tank as a closed system and then vent into the intake under the right circumstances, like stock.

Has anyone done this? I presume I could just run a simple valve that opens when the car is at mid-throttle and mid vacuum, and stays open when the car is off.
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Old 03-28-2019, 12:11 PM
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Pos-cat for the question; this is highly interesting to me as well (for the stock system, and I admit I have not searched yet). I assume it would be rather simple, since you already have the inputs (MAP & TPS), so you could wire an output to trigger the OEM "actuator"/valve?
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Old 03-28-2019, 01:33 PM
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I personally eliminated the solenoid valve and simply installed a check valve. The flow at idle is low enough that I have no issues idling as low as 600 RPM. You could use a spare digital output if you wanted to control a solenoid with RPM/map qualifiers.

IMO evap is required for applications similar to mine. Return-style system running e85. The fuel temp increase coupled with the sealed tank can cause a significant amount of pressure. I relocated the evap canister to the rear driver fender-well (where the fuel filter is located on passenger side NA). I have been through inspection and passed.

Edit: and parked in a garage, that I prefer doesn't smell like a refinery.
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Old 03-28-2019, 02:52 PM
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Originally Posted by Ted75zcar View Post
I personally eliminated the solenoid valve and simply installed a check valve. The flow at idle is low enough that I have no issues idling as low as 600 RPM. You could use a spare digital output if you wanted to control a solenoid with RPM/map qualifiers.

IMO evap is required for applications similar to mine. Return-style system running e85. The fuel temp increase coupled with the sealed tank can cause a significant amount of pressure. I relocated the evap canister to the rear driver fender-well (where the fuel filter is located on passenger side NA). I have been through inspection and passed.

Edit: and parked in a garage, that I prefer doesn't smell like a refinery.
That's an interesting idea. I was thinking I'd want to avoid drawing a heavy vacuum on the tank at WOT, but the boost would take care of that.

What size injectors are you running? Any extra fuel could make it harder to idle big injectors.
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Old 03-28-2019, 02:58 PM
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I have a 400hp e85 capable fuel system with ID850 injectors and a DW200 pump. I can maintain a stable static idle with this setup at 550 RPM. I bet I could go under 500 if I close the idle adjust screw.
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Old 03-28-2019, 03:03 PM
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Originally Posted by Ted75zcar View Post
I have a 400hp e85 capable fuel system with ID850 injectors and a DW200 pump. I can maintain a stable static idle with this setup at 550 RPM. I bet I could go under 500 if I close the idle adjust screw.
Good to know, thanks!
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Old 04-14-2019, 09:14 PM
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Ted, I'm running it with just a check valve, and so far so good. Thanks for the suggestion.
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Old 04-14-2019, 09:23 PM
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Glad I could help
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