Guest vvega Posted December 15, 2008 Share Posted December 15, 2008 mandrils cost a bit make a entire exhaust out of + you have to get tight and long radius bends sounds like your on the right track bro Quote Link to comment Share on other sites More sharing options...
forced Posted December 15, 2008 Share Posted December 15, 2008 "Donuts" are made specially for the purpose. Steve Quote Link to comment Share on other sites More sharing options...
kpr Posted December 15, 2008 Share Posted December 15, 2008 donuts are annoying as they aren't drop saw friendly. i usually grab a pile of 90's or 180 deg. then just start cutting and tacking the suckers together. or can tape them to start with. if you cut one wrong, you sure to use it later on somewhere anyway. the length of straight on the 90's/180's is allways helpfull as well. saves cutting and welding small sections of straight alot of the time. construction wise, i find it easiest to roughly figure out were your pipes are going to run. then build you first pipe right down to your collector, tack it all together, then use that pipe for a guide to make the rest of them. rather than trying to make all them bit by bit Quote Link to comment Share on other sites More sharing options...
Jase Posted December 15, 2008 Author Share Posted December 15, 2008 I've only built one set myself that were for a g200w in my old gemini sedan which was tight as well with 12"primaries into a 3 inch collector of 18" then through a 2" exhaust system, was pretty dull till 4g then twincam goodness got things excited, i did those the kpr method and got epicly pissed trying to get the form correct and the lengths equal, thats why i thought of the pingpong wire method to map them all out and see the result in the engine bay prior to going and cutting any expensive bends up, i may have to get a dropsaw yet coz grinders fail on nice square cuts Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted December 15, 2008 Share Posted December 15, 2008 i use large hose with stiffining wire cut 8 lengths of hose 44" long and make them fit in place then make pipes to match those one header at a time... test fit and bang all done still takes a while but you can get a bit artistic with it personally im down with twistys .... ... oh and stainless is pointless unless your keen to purge it IMO the hardest thing to make is the colector ... i make that first along with the front secion of exhaust then position that where it needs to go ... then do the front pipes may sound silly but there is nothighn worse than making extractors.... then finding you cant get a pipe to them hope that helps oh and sropsaws fail at cutting bends ... get some chain cutters and a alignment clamp Quote Link to comment Share on other sites More sharing options...
Jase Posted December 15, 2008 Author Share Posted December 15, 2008 sounds like a plan where would i buy such ingenious things? Quote Link to comment Share on other sites More sharing options...
Gaz Posted December 15, 2008 Share Posted December 15, 2008 Fuck this is awsome info and tips.. If you want you could do a combined write up when/during making them in the tech subbmisions section. Quote Link to comment Share on other sites More sharing options...
Jase Posted December 15, 2008 Author Share Posted December 15, 2008 sounds like uj or vega would be best info people gaz man, i'll post up my progress once i get into it and build my jigs Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted December 15, 2008 Share Posted December 15, 2008 IMO the hardest thing to make is the colector ... i make that first http://www.trademe.co.nz/Trade-Me-Motor ... 424181.htm http://www.hybridgarage.co.nz/ (His website) Im looking at getting a collector of this fella, i think the price is reasonable and he can put any flange you want on them for the same price. Unless your not even talking about turbo collectors ... which im staring to think ur not. Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted December 16, 2008 Share Posted December 16, 2008 sounds like a plan where would i buy such ingenious things? alignment clamps from arc welding supplys .. i think they may sell chian cutters but appco might be your best bet or hand tool house hope that helps mate Quote Link to comment Share on other sites More sharing options...
forced Posted December 20, 2008 Share Posted December 20, 2008 http://www.wallaceracing.com/header_length.php Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted December 26, 2008 Share Posted December 26, 2008 chain cutters are great untill you want to cut an angle, id buy a band saw you can pick one up of tm for $200 and ther well worth there moneys, and yeah agree with above^ start from collector and work up =D Quote Link to comment Share on other sites More sharing options...
Jase Posted January 7, 2009 Author Share Posted January 7, 2009 went to coby yesterday and bought some bends which were really well priced although all out of the scrap bucket, $rutherford and found some chain cutters at autotrail $12xsir ed also got collectors for header primaries and merge for secondary in aforementioned rutherford thanks to mat at coby (gc), will just have to get some guides from arc welding sup and drop my dummy block in the parts car and start with the brazing rod and flexi pipe to get the forms Quote Link to comment Share on other sites More sharing options...
Steelies Posted January 7, 2009 Share Posted January 7, 2009 mean! keen to follow progress vicariously Quote Link to comment Share on other sites More sharing options...
Jase Posted January 9, 2009 Author Share Posted January 9, 2009 prepare you "vomit" started the mock up process before i cut any steel, i used dowel cut into 15mm blocks and some beads from spotlight, threaded over 3.2 gas welding wire, decided on 40" primaries length of said wire with 38mm being the size. did some measuring in the engine bay to find placement for the collectors then got into it last pipe is the worst has to go between the others then reach around for the length Quote Link to comment Share on other sites More sharing options...
Jase Posted January 9, 2009 Author Share Posted January 9, 2009 wire holds its shape good so can change them once i get to my car sunday and weld the collector to the flange and make some guides to stop me running out of room in the bay Quote Link to comment Share on other sites More sharing options...
FLAWLES Posted January 9, 2009 Share Posted January 9, 2009 that is a really good idea using round blocks of wood on wire very clever Quote Link to comment Share on other sites More sharing options...
Jase Posted January 9, 2009 Author Share Posted January 9, 2009 cheers mate conduit was too expensive and not going to be easy to work with, whats the story with vega? he was my leading source of useful info on this lil project, balance pipe at the collectors i'm thinkin or no bother with a single exhaust system? Quote Link to comment Share on other sites More sharing options...
FLAWLES Posted January 9, 2009 Share Posted January 9, 2009 vvega gone of forums long story still around tho can give you his home number if you want info Quote Link to comment Share on other sites More sharing options...
kpr Posted January 9, 2009 Share Posted January 9, 2009 wouldn't bother with balance pipe if you are going into a single. i would look at running a custom collector or modifying those coby ones(if they are normal coby ones that is) . put a pyramid in the center, so it doesn't have the dead area in the center of the collector. Quote Link to comment Share on other sites More sharing options...
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