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Originally Posted by 68gt500
Not quite 427 & Cobra but 428 & Shelby:
Relaxed highway driving (70-90 mph)
Holley 750 (3310) 16-17 mpg
Holley 850 DP 14-15 mpg
48 IDAs (tuned by an "expert"  ) 8-9 mpg
48 IDAs 13-14 mpg (my current - not yet perfect tune)
The leaner tune runs much , much better than the "expert" and also noticeable better than the Holleys.
I expect the Webers to do as well or better than the 3310, after I find a way to reconnect the vacum advance.
At $2 per Liter (3.78l / gal)  I do care. |
Update on the tuning & "fuel economy"
The last couple of weekends were filled with nice drives to car shows.
The mileage has stabilized at 16mpg. Not too bad considering that the vacuum advance is still not hooked up.
Seems the Webers have a build in choke, I have noticed that the car runs noticeably richer when cold and leans out as temperature increases.
With temperatures arround freezing the drive back from the show on Saturday was a pretty frosty experience ... (should have replaced the heater core in the summer)