Techno Torque Part 2.

[The Radium King]

i'll modify my bs slightly. the 987 series have a second resonance flapper on the plenum; the 986 does not. the ipd product does away with this flapper on the 987; it's a non-issue on the 986. so, perhaps no issue with low rpm tuning to add an ipd plenum (or equivalent) to a 986?

here is the thread that i referred to earlier; scroll down a little over 1/2 way to see a quick simulation of airflow through a stock plenum - see how the sharp inside bend reduces airflow by over 50%:

linky

perhaps someone could confirm, however, that max airflow is not required? ie, that the engine recieves sufficient air as designed. i ask as i read somewhere that the 987 has smaller manifold intakes than the 986, so revising airflow pre-manifold on the 986 (with smaller engine) may not be worthwhile?

[JAAY]

Go to the dyno. Go stock, go IPD and see the difference in the power. It Is not a max HP number. It smooths out the overall curve and its real R&D must have been where we kick to high cam. No more dip in power just and increase. That is there big 25hp claim and it is there. The Softronic piece looks to be awesome! Big money and would not work on my car because it is too old. I would do it though if I had the chance. I wish I had as much knowledge as you all do on this subject but I have tried all the mentioned and the IPD has caused no problems and has fixed the dip in power when we switch to high cam. Sorry I have nothing to say about fluid dynamics or scoops or cavitation.

Anyone know how to change the oil?

[Johnny Danger]

The problem for most of you guys is that you haven't tried the new RRJ III super plenum yet. It gives you real seat of the pants power .