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JimA=> I probably don't understand what you mean, => so please explain exactly what you are running. I'm running an FI distributor with working vacuum advance connected to the stock vac port on a pair of '66 Solexes tuned for my 1641, with larger jets and later venturis. With these carbs the vac advance kicks in when the throttles open and tapers off as they close for cruising. This provides a noticeable increase in torque on acceleration compared to the FI dist without the vacuum. I know this from testing the same distributor with a nonworking vac can on the same car, which produced somewhat better acceleration than the 009, but still flat. (An added factor is that high-country driving requires greater timing advance.) This distributor produces a very nice curve for the carbs -- not perfect, I'm still looking for that one, but very nice. I'm happy to give you that one might expect different results, but I'm working with direct experience here rather than theory. (Side note: This summer I plan to finish testing my suspicion that all-mechanical-advance distributors lead to higher engine temperatures. I'll give you the numbers when they're in.) I agree that his car should run without the vac advance, under whatever conditions the questioner has, but I expect it will be sluggish, like an 009. I suspect that most Type 3 owners really don't expect much better than sluggish, but they should. Steven Ayres, Prescott AZ '66 Grosse Karmann ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/