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Guest Anonymous, October 15, 2003 in BMW 2002 General Discussion
Probably 40's are better, but either can be set up to work on a stock motor. Supposedly you won't see any performance gain with 45s (relative to 40s) until you get well over 7000rpm. That's just what I've read, but it seems credible.
Of course, some well-known tuners claim that you can get 180hp out of a 40/40 downdraft setup, so there's no clear benefit to sidedrafts until you get to really extreme motors.
If you have a choice between 40s and 45s at the same price, the 40s might be a bit easier to tune for street use. I have 45s on my otherwise stock motor because the price was right when I came across them. I love them, and I won't go back to downdraft.
on a stock motor? There's got to be a point where more air doesn't matter, I just don't know what that point is.
cheaper at the pump, less tweaking and cheaper to convert from either a stock solex or weber.
down drafts may work fine, but dual sidedrafts are just f'in cool.
I would use 40s on a stock motor. Just make sure the idles are set right and maybe "adjust" the progression holes.
My experience w/ 45s was that they were only really happy when accellerating.
you can tune both of them to run 34mm chokes and you'll be fine. It's great even on stock motor.
Two might be a bit much, I'd think. I'm going with the single Lynx 45, as I don't have any other sufficiently funny 45's to stick on my engine.
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