efy2bjg 0 Posted April 22, 2006 Has anyone heard of (on any engine) a modified downpipe off a standard exhaust manifold feeding a turbo? The diagram below shows (sort of!) what i mean. Side view of mi16 engine So the turbo would sit where the battery goes in a 205 engine bay. I'm sure space would be an issue but is this a reasonable idea? Would the distance cause too much lag? Ben Share this post Link to post Share on other sites
miamistu 1 Posted April 22, 2006 (edited) Yes, lots of people in ameraca do exactly what you're talking about with the BMW M20 engine, using an adaptor to mate the standard exhaust manifold up to a turbo. It's a pretty cheap and effective way of doing things, although you're likely to lose some heat from the extra length over a manifold that's as short as possible which might introduce a bit og 'lag' but then again that might depend on the compression ratio you're using. That said, I saw a video of some yank twat with a turbo mounted just beside the rear silencer the other day which supposedly worked despide the exhaust gasses being pretty tepid by then, and the charge air having miles to travel. Gotta be worth giving a go, although the union for the manifold on the GTi/mi16/FWD-car etc is designed to flex quite a lot which means you don't have a nice flat face to bolt the adaptor to, so supporting the turbo would be important too. Cheers! Alex (signed in as Stu, sorry) Edited April 22, 2006 by miamistu Share this post Link to post Share on other sites
Guest Chris Astley Motorsport Posted April 23, 2006 All depends on how big a turbo you a planning to go for too? Chris Share this post Link to post Share on other sites
efy2bjg 0 Posted April 23, 2006 (edited) O.k thats promising, I'm sure although performance may not be as great as a proper one, it would work out at a fraction of the cost. Also the equal length miturbo manifolds (dp.engineering etc) aren't exactly short are they. All depends on how big a turbo you a planning to go for too? Is this due to the reduced gas velocity etc. not turning a big turbine? Edited April 23, 2006 by efy2bjg Share this post Link to post Share on other sites
B1ack_Mi16 67 Posted April 23, 2006 Won't the up-pipe from manifold to the turbo take so much space, that you'll have big problems getting the exhaust back down under the car afterwards? It's pretty short in space there in the first place. Share this post Link to post Share on other sites
keith 0 Posted April 23, 2006 alternatively, purchase one of these. Share this post Link to post Share on other sites
efy2bjg 0 Posted April 23, 2006 Won't the up-pipe from manifold to the turbo take so much space, that you'll have big problems getting the exhaust back down under the car afterwards? It's pretty short in space there in the first place. Yep probably But there'll be a way through!! alternatively, purchase one of these. 'Purchase' being the important word! how much was that? and aren't they rather rare? Share this post Link to post Share on other sites
B1ack_Mi16 67 Posted April 23, 2006 Yep probably But there'll be a way through!! 'Purchase' being the important word! how much was that? and aren't they rather rare? I don't know, I seem to have one lying in my basement Share this post Link to post Share on other sites
efy2bjg 0 Posted April 23, 2006 Do you want to sell it? Share this post Link to post Share on other sites
joris_andriesse 8 Posted April 23, 2006 On what way is the T16 turbo constructed. It's also sideway's of the engine isn't it? Share this post Link to post Share on other sites
Mandic 0 Posted April 23, 2006 On what way is the T16 turbo constructed. It's also sideway's of the engine isn't it? Yes, because there was no room as the transfer box was in the way, so they had to mount it sideways. Cheers Ziga Share this post Link to post Share on other sites
Anton green 12 1 Cars Posted April 24, 2006 alternatively, purchase one of these. Correct me if I'm wrong, but does the T-16 use a manifold with a wierd fitting to the turbo which are difficult to get hold of? Suppose an adaptor of some sort could be fabricated, but this might affect the costs of the project which you said were an issue Share this post Link to post Share on other sites
B1ack_Mi16 67 Posted April 24, 2006 Adaptor plates are dead easy to make. Just draw one in Autocad and get it laser- or watercut. Share this post Link to post Share on other sites
jacobs53 0 Posted April 24, 2006 I have a adapter plate already produced for this manifold. really easy to autocad up, and make. lee Share this post Link to post Share on other sites
keith 0 Posted April 24, 2006 I have a adapter plate already produced for this manifold. for use with which turbo? Share this post Link to post Share on other sites
jacobs53 0 Posted April 24, 2006 garrett t3 flange type - rectangle lee Share this post Link to post Share on other sites
pug_life 0 Posted April 24, 2006 for the cost of a steel equal length from DP its not worth the hassle... £370 delivered i think was the price pieter quoted me can come with T3 or T25 flange... designed to fit in a 205 so you don't have worries in that sense.... Share this post Link to post Share on other sites
Anton green 12 1 Cars Posted April 29, 2006 (edited) Should you do the custom downpipe to turbo thing, let me know how you get on. Im wieghing up my options right now regards building a big power 16valve engine... Edited April 29, 2006 by Anton green Share this post Link to post Share on other sites
efy2bjg 0 Posted April 29, 2006 Should you do the custom downpipe to turbo thing, let me know how you get on. Im wieghing up my options right now regards building a big power 16valve engine... I've got so many plans and ideas spinning around in my head, for a change! But i finish uni for good in a month so i might just have the spare 205, the idea, the enthusiasm, the money and most importantly the time for something to happen. Share this post Link to post Share on other sites
