I have had triple webers set up on the car for a while now, very happy with them but now looking to resolve a long awaited issue - the progression circuit!!!
These are 45mm DCOE (152). From what I gather the 152g came out after these with an extra 1-2 holes drilled into them.
Basically the issue is as per the picture - the throttle plate should sit directly under the first progression hole. This way as you just crack the throttle from idle (driving off at a set of lights) you won't enter a lean spot until you reach the first hole which then allows more fuel in (the transition between idle circuit and main circuit). If I adjust my idle screw to position the throttle plate under that first hole the idle is approximately 3200rpm.
After some fiddling around I got relief from changing emulsion tubes to an F7 which provides a "richer" bottom end throttle response. This combined with a very rich idle Jet (65F9) has relieved the issue some what and I have been happy with it up until this point. The downside with this set up is that fuel mileage is rubbish as during normal driving you are generally sitting around the progression holes when cruising.
The time is now drawing near to put together the new engine in which case it will give me time to address this issue with the carbies off the car. My question to you all is - has anyone here done it (as I have seen some alpha posts about it) and how were you able to accurately measure the spot to drill the hole..??
Edited by Roady, 03 November 2016 - 01:22 PM.