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