- Sat May 08, 2021 12:29 am
In Germany you may drive 500km to find a guy that might be able to set up your engine with Weber carbs. When those "specialists" failed I started doing it my self. Took quite some time. For about 10 years I was hardly the only guy around, that used a lambda sensor (narrow band at that time) with a self made display for tuning. No "car specialist" understood why I used a part from a US emission controlled car with carburetor tuning. They barely used exhaust gas analyzer at rolling roads! German specification cars did not have cat. converters at that time. The German TÜV prohibited any tuning and engine modifications. So except for a hand full of race engineers there was no one who did it as a main job with extensive knowledge.
If you want to have really perfect set up twin Weber carbs, just the jet's, emulsion tubes, levers, springs and valves will cost you as much as a complete Speedunino ECU with extra parts. Off course, clever combined with reliable stock parts (pump, sensor, regulator etc.). People forget that carburetors need special pumps and regulators too, to work well. So in the end you get less performance, more consumption, reduced engine live and all around worse engine behavior for much more money. It is hard for a beginner to tune an ECU near to perfection, but impossible for the same guy to set up some Webers. You need at last parts for 1500-2000 Euros, just to have enough parts to try for the best fit. I'm always very amused, if people start to give advice which combination of jets might fit some engine, if even the basic carb, like a 45DCOE, was build in several different versions. So a jet combinations on the same engine will not work if the carbs are not 100% identical.
A circuit race, max power set up can be realized in one day, but for a daily driver, running smooth and economically, yet with top end power in any load situation, you can spent weeks or even month of fine tuning.
Weber carbs are for very rich people. They look really good on a detailed engine. The poor enthusiast needs a Speeduino.