Quote:
Originally Posted by arcosine
You could probably turn the idle speed down too. Vtech engines only disable one intake valve and leave both exhaust valves operating. You might try that to see what happens.
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You can't really turn down the idle, it's controlled by the computer. Or was until recently. I'm having issues with the idle control valve right now. With it currently disabled, the engine will sometimes idle at ridiculously low RPM. Or sometimes it will just stall. But I think you're right, it seems like it could idle a lot lower than 750 RPM. At this point, I'd be happy with any idle speed as long as it was consistent. My current choices are a 1000-1500 bounce with the idle valve working or somewhere between 750 and stalling with the idle valve plugged. The only idling I do is coasting at night with the heat and lights on, so I'm not sure I'd gain much with a lower idle speed anyway. Especially if I replace my dying battery with something bigger!
I am curious what would happen if I had all 8 exhaust valves opening. Any predictions? Finding the motivation to play with the oily puzzle might be a challenge! And I built an exhaust system that will outlast the car after doing the valve delete. The tiny single straight-through muffler I used wouldn't be enough with all 8 exhaust valves talking. This engine never had an EGR valve. I'm wondering how much EGR effect I'm getting with less exhaust valves.