Quote:
Originally Posted by Sikoriko
Wouldn't you have to direct the fuel flow almost into the back side of the intake valve? The closer the better?
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Not necessarily so. We were plumbing in before the throttle body. Here's a PDF of the GReddy Rebic IV we were using back in the day on my RX-7.
http://www.greddy.com/upload/file/Rebic_IV.pdf
The PDF tells you how it works and shows components that would be in a sub-injector kit.
The way things are now, the need for a sub-injector system have pretty much gone away with better injector, fuel pump and fuel management technology, BUT there's still a niche for this sort of system. Apparently, some people are still using them.
A rising rate fuel pressure regulator is the way to go if one is experiencing lean-out in the higher RPM band. Tuning it on a dyno is essential.