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Shad meant to send this to the list and not just to me... >Hey Hal- > > > >Or, if you like, you could upgrade from the second-best > normally-aspirared > > >induction setup to the best - a tuned Heimholtz resonator... :-) On a > > > > .... a what? > >Basically, a well-tuned version of what the FI T3 and T4 already have. You >take advantage of the waves created by the pulses in the intake system to >generate a "free" high pressure pulse at the intake valve at the right >time so >you can cram more air in there over a certain RPM band. You size the intake >runner length and diameter appropriately (kinda like a tuned LC circuit...). >Then, to broaden the boosted band, you add a properly-sized plenum (kinda >like >adding R to make an RLC circuit...). And, you put on a single throttle >body. >One of the advantages of a modern FI system was the ability to easily add >this >to a production car. Note that the stock T3 FI does NOT have this well-tuned >setup - the 4 intake runners are different lengths and the small throttle >body >restricts the system... > >There are two ways to figure out the dimensions you need. One is kinda >rough, >but is rather simple to calculate. The other is a PITA and involves complex >engine simulation programs. > >It may sound like a petty performance perk, but it can actually be quite >sizable... plus, the one throttle body you end up with can look huge (my >Mercedes part is 60mm :-) > >Take care, >Shad ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org