Quote:
Originally Posted by Mountain
This is something I believe Tony Mamo touched on before, and where you need to be very careful how you "port" the area very near the throttle blade first few degrees because you can get the ECM to throw a code.
One thing I want to point out/comment: about the ported throttle bodies out there and not starting to do anything until about 25-degrees - Are your comments in respect to the theoretical 0-degree point (fully vertical; like your example sketch/drawing) of the throttle blade or in respect to their true, as-built rest position (which is NOT completely vertical)? Reason being as this is important to keep in mind with what you have posted and the work you have done.
P.S. - Appreciate the write up and the work you and your company did.
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Thank you, Mountain. You are absolutely correct and careful we are. This is the area that really makes the difference in response out of a stop, right off idle. Very sensitive dimensionally, uncontrollable by hand porting. We think this is one of the features that sets us apart, our ability to carefully work this area w/o upsetting the ECM.
Minimum flow does not occur at the physical zero degrees (vertical). It happens at about 1-2 degrees (This is the "zero" for results plotted).