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The VPD way is the BEST way to do draw through supercharging because it keeps the distance that the air/fuel emulsion has to travel to a minimum.
I haven't seen underneath the VPD setup, but I hope it has a bunch more stuff holding up than just the manifold, because I have broken one of those aluminium manifolds with just 2" SU's on it.
I have a friend who set up a VPD kit using a throttle body and injectors in the head (with MegaSquirt), so he's not getting any fuel drop out. I expected this to make more power yet, or at least get better fuel economy, but it doesn't seem to be much different.
Shhhh, don't tell JohnMc! :P
Seriously though, I would expect some fuel economy increases at anything less than part throttle, so it might need more tweaking. With fuel injection, you can go incredibly lean at cruise speeds. Was it Weber or Mikuni before?
On my old 164 I could lean the mixture out so far that I'd need quarter throttle to hold 100km/h. That's were you find economy in a gasoline engine, the leaner you run, the more throttle you need & therefore the actual running compression ratio goes up. Unfortunately, set like that makes the gas pedal very doughy feeling, it really needed a switch to change between a gas pedal with maximum response & maximum economy. I used to just switch MPS's on track day.
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Three 164's, Two 144's, One 142 & a partridge in a pear tree.
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