Corky Bell's "rules of thumb"...

[audidudi@mindspring.com (Jeffrey J. Goggin)]

>That's the one.  And it confirms your numbers pretty well too.  Some
>correction of that might be argued vs Corky Bell's own test methods for ICE
>  (see page 209-210) he uses WOT at 4000rpm max boost, allowing only Time for
>Measurement to stabilize the thermocouple reading.  Averaging x runs, he
>calculates ICE.  Your (and acually SAE 860103 too) are prolly a more accurate
>reading as to MIN ICE, which includes some heat soak, not quite the same as
>Bell's more realistic Average ICE (which is most likely higher than your SAE
>method).  Both tests computed are probably a good measure of IC performance
>in a given application.

I've been reading the Bell book and am puzzled at how some of his
conclusions seem to differ so markedly with those BTDTs posted here.  For
instance, he says there's no point in having the exhaust system any larger
than the turbo outlet (in the case of our cars, roughly 2.25") yet those
running 3" downpipe/exhaust systems claim significant performance
improvements.  Likewise, the boost levels he recommends for 92/93 octane
pump gas are quite a bit less than what many of us are running (presumably
with no ill effect) and he likes big turbos for maximum power and not small
turbos for maximum throttle response ... what gives here?
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