chownr 0 Posted August 17, 2007 Thinking of doing something out of the ordinary. I could just save up and buty a set of Throttle bodies or do a bike body conversion but fancy something different. I have two spare Gti 6 manifolds lying around and Im wondering whether you could modify the plenum to accept a GTI6 throttle body on either end? Obviously plenty of fabrication involved but I can get that at mates rates Is it feasible? Are there any draw backs? Would it work? Any estimates of what power increases you might see? Dont need AFM as it would be on mappable ECU Any thoughts/comments? Rich Share this post Link to post Share on other sites
Richie-Van-GTi 74 2 Cars Posted August 17, 2007 its certainly feasible, not sure if there are any real gains to be had, it may flow more air but not sure how it would effect turbulance in the plenum, or are you thinking of splitting the plenum area as well so its in 2 with a body for each? If your going for mappable ignition anyway why not just get 4 smaller bodies from a base model car and have one on each intake retaining the standard injector position so its more like conventional bodies? That or just fabricate the existing plenum to accept a much larger body, even make the plenum larger. Eccosses red and white 306 was making well over 200bhp using a single body setup and a large carbon fibre plenum, obviously cammed and head work as well but it shows that a well designed plenum and body arrangement can be beneficial. Share this post Link to post Share on other sites
chownr 0 Posted August 17, 2007 Ive had some discussion over turbulence in the plenum but havent any definitive answers - some say it will be detrimental, some say it wont have any effect and some say it may be an improvement. As you say a decent single body on a decent plenum can proive good power - look at the s1600 rally cars - just thinking outside of the norm. R Share this post Link to post Share on other sites
Craigb 2 Posted August 17, 2007 As you say a decent single body on a decent plenum can proive good power - look at the s1600 rally cars - just thinking outside of the norm. R Rich see if you can get some pictures in cross section of the S1600 inlet plenums and you will see that they are not what they seem to be Share this post Link to post Share on other sites
chownr 0 Posted August 17, 2007 Ah Tell me more craig!! Looks like I need to do some more research! R Share this post Link to post Share on other sites
chownr 0 Posted August 17, 2007 OK a quick seacrh reveals that essentially the Citroen inlet is a single throttle butterfly serving a large plenum. There is an internal filter in the plenum with 4 trumpeted tracts and individual injectors. Isnt this identical to the GTi 6 Inlet (except for the internal air filter?) Seems like two butterflys isnt necessary/is the wrong way to go? Maybe better as Richie suggested do some machine work go for a single larger inlet butterfly or maybe larger plenum? Rich Share this post Link to post Share on other sites
