jevansio Posted August 19, 2010 Share Posted August 19, 2010 I'm wanting to replumb my screamer into my downpipe for trackdays. Got it booked in today but having 2nd thoughts. There doesn't look like a lot of room and removing the downpipe with reroute looks like it is going to be a massive PITA compared with the unmodified downpipe. As I don't have access to a ramp I don't want to make it impossible to remove the downpipe in my garage on my own. Any of you guys with this setup care to share your thoughts? Quote Link to comment Share on other sites More sharing options...
Wez Posted August 19, 2010 Share Posted August 19, 2010 Just make sure you get it done properly, I lost over 50hp when my wastegate was routed back into the exhaust badly. The first attempt worked really well but cost well over £500 to get done as I also included another centre box, I was trying to quieten down a Veilside Ti. That worked fine until I pulled the exhaust off going over a speed bump. The replacement which was around another £500 was rubbish, the routing was bad and caused a massive loss in power, in the end I settled on a open silenced wastegate pipe and a Tannabe exhaust Quote Link to comment Share on other sites More sharing options...
jevansio Posted August 19, 2010 Author Share Posted August 19, 2010 Thanks for that Wez, so you have a muffled screamer, any pics? I like that idea, makes working on the car easy & to performance loss I think I know the way ahead PS you OK on track days with a muffled screamer? Quote Link to comment Share on other sites More sharing options...
Wez Posted August 19, 2010 Share Posted August 19, 2010 My exhaust on normal checks is around 86db thanks to the Tanabe and I havent been kicked off yet for a drive by pass. I dont have a pic sadly, my screamer pipe is basically a small muffler with a V band on one end for the wastegate connection. Quote Link to comment Share on other sites More sharing options...
dandan Posted August 20, 2010 Share Posted August 20, 2010 Mine is a piece of p!ss to get in and out mate but I may have a little more room than you. Undo 3" turbo V band, undo 4" midpipe V band, undo 2 small V bands on wastegate pipe feeding downpipe, unclip O2 sensor and pull downpipe up and out. Quote Link to comment Share on other sites More sharing options...
jevansio Posted August 20, 2010 Author Share Posted August 20, 2010 Yeah the tubular manifold seems to take up a hell of a lot more room I fear any feed onto the downpipe will mean it has to come in from underneath & that is a right PITA when on the floor/axle stands Quote Link to comment Share on other sites More sharing options...
dandan Posted August 20, 2010 Share Posted August 20, 2010 I thought that may be the case mate There is a lot of room down there with a cast manifold which makes certain jobs very easy. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 20, 2010 Share Posted August 20, 2010 Get a log manifold? Quote Link to comment Share on other sites More sharing options...
jevansio Posted August 20, 2010 Author Share Posted August 20, 2010 I thought that may be the case mate There is a lot of room down there with a cast manifold which makes certain jobs very easy. Yip, I think this is why Wez muffled screamer is a better idea for me Get a log manifold? I don't think it'd be any good if I went 74mm+ turbo Quote Link to comment Share on other sites More sharing options...
dandan Posted August 20, 2010 Share Posted August 20, 2010 Get a log manifold? That would mean changes to intake, IC pipes, and downpipe though. Plus I would recommend a lot of porting to get the manifold to flow well and I suspect Jay won't be interested in all this effort to quiten the wastegate down. Also, I'm not sure whether you'd see any power loss from the cast manifold up at 700hp+ I'd put mine against any other car on the RR running same cams, turbo and let's say 1.7bar boost and would be confident there'd be no loss of power up until the 620 kind of area. Above that I wouldn't be so sure Quote Link to comment Share on other sites More sharing options...
jevansio Posted August 20, 2010 Author Share Posted August 20, 2010 That would mean changes to intake, IC pipes, and downpipe though. Plus I would recommend a lot of porting to get the manifold to flow well and I suspect Jay won't be interested in all this effort to quiten the wastegate down. Also, I'm not sure whether you'd see any power loss from the cast manifold up at 700hp+ I'd put mine against any other car on the RR running same cams, turbo and let's say 1.7bar boost and would be confident there'd be no loss of power up until the 620 kind of area. Above that I wouldn't be so sure Yip, spot on Dan, it's a lot of work just to quieten things down I'd have no quarms on putting a log on a T67, hell I was going to get one before I bought my HKS tubular Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 20, 2010 Share Posted August 20, 2010 Im not sure, but theres a guy on ClubAristo building a big single using a cast manifold. Hes not going for 700+ hp though... Quote Link to comment Share on other sites More sharing options...
Wez Posted August 20, 2010 Share Posted August 20, 2010 Im not sure, but theres a guy on ClubAristo building a big single using a cast manifold. Hes not going for 700+ hp though... Which manifold, I think the Arnout cast manifold would support more than 700hp Quote Link to comment Share on other sites More sharing options...
ace67 Posted August 21, 2010 Share Posted August 21, 2010 Read post 29 http://www.supraforums.com/forum/showthread.php?t=445445&highlight=arnout&page=2 This is of course if your using a Arnout log mani. 816 rwhp is ok with me even if it is US of A horsepower. That would mean changes to intake, IC pipes, and downpipe though. Plus I would recommend a lot of porting to get the manifold to flow well and I suspect Jay won't be interested in all this effort to quiten the wastegate down. Also, I'm not sure whether you'd see any power loss from the cast manifold up at 700hp+ I'd put mine against any other car on the RR running same cams, turbo and let's say 1.7bar boost and would be confident there'd be no loss of power up until the 620 kind of area. Above that I wouldn't be so sure Quote Link to comment Share on other sites More sharing options...
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