kpr Posted June 3, 2009 Share Posted June 3, 2009 I cant find the page where it mentions it now, but the TODA racing website somewhere mentions that although a 4-1 setup gives marginally more top end, with a good 4-2-1 they were losing say... 1% top end but gaining crap loads of mid range and low end power.They show pipe diameters etc for Altezza 3S extractors here: http://www.toda-racing.co.jp/en/product ... i/3sg.html Presumably inside diameter for piping. toda stuff seems to run pretty big primary's & secondaries, if those measurements are id. the 4age and b16 etc have same measurements on them as well. im only running 38.1 stainless on mine which is about 35-36mm id. thats alot more area Quote Link to comment Share on other sites More sharing options...
Roman Posted June 3, 2009 Share Posted June 3, 2009 Yeah, if I ever have a go at making an exhaust manifold I'll likely mostly try to copy the TODA design/lengths/diameters/etc I could get a close enough idea by scale measuring in autocad, from known measurements on the pic (hole to hole on the flange) to find out if that's OD or ID, and get ballpark figure for primary and secondary lengths but CBF right now haha. Either way, it's interesting that it retains what looks to be about the equivilent overal length compared to standard, but much longer primaries and much shorter secondaries... Quote Link to comment Share on other sites More sharing options...
Testament Posted June 5, 2009 Share Posted June 5, 2009 Pretty well know fiat twin cam guru also saying 4-2-1 with long primarys is the way to go: http://www.guy-croft.com/viewtopic.php?f=4&t=1917 Quote Link to comment Share on other sites More sharing options...
Hemi Posted June 5, 2009 Share Posted June 5, 2009 i heard from a source (reliable im not sure) that 4-1 are better tbh id rock 4-1 because they look better. i also learnt the with x pipes (for 6's and 8's) that a 20 cent hole is better then cutting the whole lot out .. turbulence issues im gonna have a stab at Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted June 5, 2009 Author Share Posted June 5, 2009 Pretty well know fiat twin cam guru also saying 4-2-1 with long primarys is the way to go:http://www.guy-croft.com/viewtopic.php?f=4&t=1917 im going to be on that site for ever now its full of awsome shit Quote Link to comment Share on other sites More sharing options...
kdotlowe Posted June 7, 2009 Share Posted June 7, 2009 I always understood that 4-2-1's are suited for fast-road applications, low end torque etc. and 4-1 was more suited to race use where power in the higher revs is necessary? Quote Link to comment Share on other sites More sharing options...
BobbyBreeze Posted June 7, 2009 Share Posted June 7, 2009 Anyone got any good guides for making merge collectors? Quote Link to comment Share on other sites More sharing options...
kpr Posted June 7, 2009 Share Posted June 7, 2009 as in how to make them, or angles etc? Quote Link to comment Share on other sites More sharing options...
BobbyBreeze Posted June 7, 2009 Share Posted June 7, 2009 Both. I can imagine welding them up could get tricky. Just modeled a 4>1 in Autodesk inventor. Angles aren't hard to work out. Quote Link to comment Share on other sites More sharing options...
kpr Posted June 7, 2009 Share Posted June 7, 2009 gotta make one for my turbo manifold soon. will take some pics of how i make em. Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted June 7, 2009 Author Share Posted June 7, 2009 turbo for what? dont go back to the dark side turbos are for girls Quote Link to comment Share on other sites More sharing options...
kpr Posted June 8, 2009 Share Posted June 8, 2009 hah, for the 85 man. kp stays na! Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted June 8, 2009 Author Share Posted June 8, 2009 sweet closest ill ever come to a turban ae85/86 is on forza Quote Link to comment Share on other sites More sharing options...
kpr Posted June 10, 2009 Share Posted June 10, 2009 easy Quote Link to comment Share on other sites More sharing options...
treggo Posted June 10, 2009 Share Posted June 10, 2009 I like your style. That actually looks rather doable. If I buy a new welder or can borrow one, I'm pretty keen to build my exhaust system. Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted June 10, 2009 Author Share Posted June 10, 2009 i need a mig welder buy one then let me borrow it Quote Link to comment Share on other sites More sharing options...
treggo Posted June 10, 2009 Share Posted June 10, 2009 lol I will send it to you via yacht. Is it a bad idea to buy an old system off a commodore or something and use it for parts? Quote Link to comment Share on other sites More sharing options...
Simon Posted June 10, 2009 Share Posted June 10, 2009 *Sweet fabrication pictures* That looks way easier than i thought it would be. No show for 3 cyl so i can do it for suzuki lol Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted June 10, 2009 Author Share Posted June 10, 2009 lol I will send it to you via yacht.Is it a bad idea to buy an old system off a commodore or something and use it for parts? im using old toyota camry stuff (mandrel bends ) Quote Link to comment Share on other sites More sharing options...
Testament Posted June 10, 2009 Share Posted June 10, 2009 How much I've got done so far. not enough. Quote Link to comment Share on other sites More sharing options...
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