Quote:
Originally Posted by pstrbrc
Here's a thought:
Ford used variable cam timing on some of the Zetecs (Contour, Cougar, ZX-2) to advance the exhaust timing in such a way that the exhaust stroke wasn't completely scavenged. They were able to use this instead of egr to meet nitrous standards. So how much the intake charge is diluted has much less to do with intake vacuum. The smaller the throttle opening, the smaller the charge that went in on the previous cycle, and so the easier the subsequent exhaust gasses have of getting out during the exhaust cycle, so the lower the total number of exhaust gas molecules left. Now, this isn't exactly linear, but a whole lot more linear than egr.
So, I'm thinking of putting a Zetec /exhaust VCT in my Escort. MegaSquirt the intake, control the VCT solenoid (it's PWM, and I think 12v, but it might be 5v. Have to play with it, 'cause there is limited info on the solenoid.) with an Arduino board if I can't build a pwm circuit in the prototyping section of a v.3 MS board.
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Sorry to thread jack...
There is a tuner available who can control the VCT on the Zetec:
Vit Tunes available yet again! If you go thru him you can get it done cheaper, with less headaches and he can tune the Zetec to run better than anyone. I've been talking with him about options. I'm hoping to go this route soon. I'm definatly not advertising for this dude, just want to see this happen.