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Old 01-11-2021, 08:56 PM   #2 (permalink)
Master EcoModder
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spyder2 - '00 Toyota MR2 Spyder
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EGR should be off at no load, high at medium load, and off at max load. You can get that with two valves, one that opens at max load and closes at 0, and vice versa in series. I'm not sure how actual vacuum EGR valves work, but that's the idea.

You would need to add spark advance if you increase EGR, or you may lose fuel economy.
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