RYANVR6 2 Posted August 15, 2013 Report Share Posted August 15, 2013 Why do people get a 6 branch manifold and what performance benefits can you expect from one roughly?Sorry for the noob question Link to post Share on other sites
daveyboy 897 Posted August 16, 2013 Report Share Posted August 16, 2013 My understanding is that the exhaust gasses are more free flowing with a 6 branch over the standard manifolds and the benefits are the engine breaths easier meaning a few more ponies being released essentially Link to post Share on other sites
RBPE 198 Posted August 26, 2013 Report Share Posted August 26, 2013 It's called Computational Fluid Dynamics and is used for gasses and liquids and an important part of tuning correctly:http://en.wikipedia.org/wiki/Computational_fluid_dynamicsThere are many variables, not least of all packaging and emissions regs etc and in short, best power is straight in and straight out with no restrictions but obviously that is not always possible.Below is something I acquired over the years of studying it and is a reference model to the change in length of inlet and exhaust pipes (on a diesel engine) and the way in which it changes the torque and power characteristics (imaging the curve as the orque curve you see on dyno's to make it easier to understand and where the power/torque is in relation to the rev range). Link to post Share on other sites
VR6Pete 1,456 Posted August 26, 2013 Report Share Posted August 26, 2013 Very informative post. Thank you Link to post Share on other sites
RBPE 198 Posted August 26, 2013 Report Share Posted August 26, 2013 No probs, tons of CFD info, it's mainly about calcs though than making the pictures look alright! (Also when you have up to a 1000 logs on each CFD tests it's time consuming to put them together).Lots of inlet and exhaust mani stuff, this was one of the dozens of tests regarding the feeding of the first cylinder in the plenum and the effects on plenum tapers etcRBPE log VRT exhaust maniLook pretty more than anything, in short, you'll be amazed at the differences plenum shapes, runner shapes, pipe circumferences etc all make and any bend radii, and contrary to what anyone tells you, my tests show that the standard exhaust, throttle body etc all become massive flow restriction points at anything from a bar of boost plus! (Done 2bar + at this present time) Link to post Share on other sites
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