sorry i dont check here often, and dont even remember getting an alert that someone posted here. but the GB has already happened, but im thinking about doing another run of them since the people who participated in the first GB spoke so highly of the gains and quality. if i do another it will probably be held on 6crew, but i'll inform everyone here as well.how much for the spacers? my car is all apart waiting on these spacers.
Well, not trying to be 'that guy'. and the workmanship of these pcs is wonderful. My career was in engine design. The factory manifold is the result of extensive CAD design and dyno prove-out. HP, Tq, emissionability (egr entry details largely), packageability, cost, even appearance are all things the factory engineers juggle to make the best design possible. This is not to say an aftermarket pc cannot exceed OEM hardware in optimizing one or more facets of a design. It is rare that an aftermarket pc is more thoroughly engineered than what the car came with, unless cost is no barrier, and even then not often.
Longer runners make more torque, less horsepower.
Adding these spacer increases runner length but not plenum volume
Not all dynos are the same. Actually few normalize the data for grains of moisture, barometer, temp, etc etc.
Trivia: typically you get a dual peak (camel hump) torque curve, one peak corresponding to the standing wave controlled by primary runner length (being changed here) and one (higher speed) controlled by the overall length to the tbody.
Anything connecting to the upper intake will not "fit" as designed when adding these spacers (love the look of them). This can be as simple as moving a flexible line like PCV to the not-so-simple modification to make the steel tube EGR line-up. Air inlet tube, connections to the tbody,etc will all not fit as designed.
Manifold to hood clearance will be diminished, obviously. If the hood closes, it is possible the manifold will hit in engine roll (sharp accel,decel). A side note, an area for hood collapse before hitting the engine is required in design to make the vehicle less lethal to a pedestrian struck. New reg, did not make this up.
Great looking pieces, but am thinking this is an attempt to fix a problem that doesn't exist. Perhaps at part throttle, longer runners will provide more torque and therefore better feel. Not sure. Great looking pcs.
i've already taken everything into account. i dont just make parts to make parts i do in fact put design effort and research into any product i make. people are already running my spacers with great reviews and are very happy with the gains. thank you for the post tho, your concerns are appreciated.