20-11-2024, 12:54 AM
More information is needed to answer this correctly. Besides dashpot oil, the piston weight and spring strength affect how quickly the piston responds to throttle openings. Set correctly this acts like temporary enrichment device such as the fuel pump in carbs like Webber's. A lag in response indicates a weak mixture on initial throttle opening, possibly due the afore mentioned items or it could be the wrong needle choice, or even a combination. I have in the past suggested reading a couple of books on SU tuning and set up that will explain everything you need to know if you can be bothered researching. I will reiterate past advice that there is no one size fits all solution with A7s as there are so many variables. You CAN NOT set the mixture correctly just with the jet adjustment nut unless you have the correct needle profile, and just because so and so said they use an AN or a No 5 or whatever dosen't meant that will be right for your engine unless everything else about the two engines and carbs is identical. The jet adjustment is only to set the idle mixture, everything above idle is set via needle profile. If you ignore this advice your mixture will always be a compromise at some point in the engines rev band and the cars performance will NEVER be optimal.
Black Art Enthusiast