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Mueller |
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914 Freak! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None ![]() ![]() |
I "borrowed" the quote below from aircooled.net
With the fuel prices going up and up, I figured that was the kick in the @ss I need to get my 914 up and running as a daily driver....since my fuel and ignition can be set however I want with my laptop, I figure I should optimize my little 1.8 for being as frugal with the petrol as it could be right now (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif)
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airsix |
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I have bees in my epiglotis ![]() ![]() ![]() ![]() Group: Members Posts: 2,196 Joined: 7-February 03 From: Kennewick Man (E. WA State) Member No.: 266 ![]() |
As always, the Cap'n is correct.
On my PEFI I have an rpm-based (ie. mechanical equivalent) max of 27 degrees. I have a vacuum-based table that is independent of the rpm-based table. The vacuum-based curve is set for a max of 12 degrees. These two tables combine to give a total max advance of 39 degrees under high-rpm/high-vacuum conditions (highway cruise for example). This is very similar to the stock advance curve (ok, a hair more conservative). I think what aircooled.net is trying to say is that if you don't have any vacuum advance you are always going to have sucky gas mileage. I'll add that you'll also always have a big flat spot from 2,400- 2,700rpm. While we're on the subject... I played with seemingly infinite ignition advance settings since it's so easy to type them into the laptop. After extensive testing I found that there is a real sweet spot that works better than anything else I tried -- The stock advance curve. (note: I have stock cam and compression. YMMV) -Ben M. |
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