Lazarus Posted December 10, 2005 Share Posted December 10, 2005 Ok! I found the thread, but it wasn't purely on this subject so I've copied and pasted the techy bit on the Na Intake system Its to do with the resonant frequencies in the plenum. The NA plenum is divided into two parts, one for cylinders 1, 2 and 3, and the other for cylinders 4, 5 and 6. There is a valve between the two which can be either open or closed. If you look at an NA engine, after the main throttle the intake pipe splits into two well before the plenum. This means that any air moving from one half of the plenum to the other has to travel a long path, so any resonant tuning will have low frequency and so benefit torque at low engine speeds. If the link valve is open, however, this effect is destroyed and the resonant frequencies move higher, and benefit airflow at high engine speeds and top end power. If you ran two dyno curves back to back, one with the link valve open and one with the link valve closed you should get two torque curves which cross over. The proper point in the rev range to open the valve is where the two curves cross, so you effectuvely get the better half of both curves. What you could do is add another link pipe between the far ends of the plenum which was even longer than the long link mentioned above, and control that with a third valve. Theoretically it would give you even more low-down torque. Three-mode plenums are quite common on V6 engines. So you can see that by replacing the standard Na intake system for the intake designed for going Na-T (effectively, a large empty box) your gonna lose some of your low end torque. Quote Link to comment Share on other sites More sharing options...
Prof. Monkey Posted December 10, 2005 Author Share Posted December 10, 2005 Well we will have to give it a try and see what happens! Hmm no idea if there is a dyno centre near me, I live in Hull Quote Link to comment Share on other sites More sharing options...
Guest curls1 Posted December 10, 2005 Share Posted December 10, 2005 well lane in Batley aint to far mate:) look's good Quote Link to comment Share on other sites More sharing options...
Gazzawu Posted December 10, 2005 Share Posted December 10, 2005 i dont recognise that manifold who is it ur buying it from? is it a kit you're buying or are you just piecing things together? how much power are you hoping to achieve? Quote Link to comment Share on other sites More sharing options...
Prof. Monkey Posted December 10, 2005 Author Share Posted December 10, 2005 The manifold is a bestoke piece made by a guy called Dave H, he makes lots of NA-T kits in the US. Quote Link to comment Share on other sites More sharing options...
SatSport Posted December 10, 2005 Share Posted December 10, 2005 yes, it`s the next step AFTER you`ve fitted your single turbo upgrade Quote Link to comment Share on other sites More sharing options...
Gazzawu Posted December 10, 2005 Share Posted December 10, 2005 alrite cant go wrong wi daves. nearly everybody runs his kit with good results Quote Link to comment Share on other sites More sharing options...
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