When you’re a Jet…
It’s a basic truth in life; little things matter. I just rejetted my VW carb to better account for alcohol in the gas. Both jets together probably weigh about a quarter of an ounce but it made a HUGE difference in the drivability of the car. The engine is much smoother and has a lot more power at low speeds.
Details: It’s a Bocar 34PICT-3 carb, and I just installed a 130 main jet, and a 55 idle jet. Remember on the 34PICT-3 the idle jet affects drivability and power up to about 2,000 rpm when the main jet takes over. In other words, it’s extremely crucial for in-town driving. The engine has a Brazilian 1600DP longblock with stock cam and crankshaft, standard intake manifold, and a SVDA distributer from aircooled.net. Electric fuel pump and separate fuel pressure regulator set and tested to 2 lbs. The fuel pressure regulator was wildly inaccurate by the way, so be sure to actually measure the pressure and not depend on the setting. I recommend locating all filters, pumps, and regulators outside the engine compartment. My car has one filter under the gas tank and another above the transmission between fuel pump and regulator. The tank has Shell regular gas in it right now (15% alcohol) but it runs the same on Citgo or Wal-Mart gas for that matter. (Jets shown slightly enlarged for detail)
UPDATE- I have consolidated this post and all the other fuel and carburetion related posts into one: 34PICT-3 Carburetor Final. That post will also be updated when new information comes in.