Smog:ok to eliminate?

[Michael Yount]

Remember Pete - the egr on efi cars does not inject exhaust gas at wide open throttle. For max power/torque you want to maximize oxygen/fuel in the chamber. The benefits of egr (reduced emissions/increased fuel mileage) come from being able to tolerate a leaner fuel mixture at part throttle/light load/cruise conditions. With a carb - I wouldn't bother. Back in the 70/early 80's before domestic cars were injected in a big way, egr with carbs didn't work very well. Trying to control the amount and timing of the injection, reduction of fuel introduced, and increasing timing advance with only a vacuum signal and a carb just doesn't work very well.

Sounds like you've done a great job making the car pass even if it's not emissions legal. Shoot for a cold air intake - it'll make the engine more efficient, and allow you to run more timing/less octane with less chance of detonation.

 

[crazypete]

Well, the egr canister uses vacuum to stay open. At WOT, there would be little manifold vacuum so the valve would close. That would work. I could tune the engine for the egr'ed aircharge and tune the powervalves to open at the HG vacuum where the egr valve closes.



But I probably wont bother, I'll just get my snorkel and be happy. I didnt go snorkel originally because I LOVE how clean the enginebay is without them. Just look at my avatar.