i am about half way through making my turbo manifold for the a12 and am finding that clearance is a real issue. there is stuff all room for large size piping to be used and there is no room around the studs. i am using 32mm internal diameter 3mm thick plumbers 90 degree bends and steampipe. its a four into to to one design. i am usin one flat plate along the whole gasket area for both inlet and exhaust. its draw throgh with a t25g. i was just wondering if others had had problems and how did you get it to fit nicelly.

oh yea and i will keep you all updated on how the project is going, should hall ass as long as everything holds together.

oh poor you, you big sook
i got two turbos in there
where theres a will theres a way

i also made mine on a flat piece of steel to mount to the head for inlet and exhaust, but then removed the inlet sections so that the inlet bolted straight to the head like it's supossed too

just thinking why go 4-2-1?, seems like a lot of work for what?

just make em as short as possible and all collecting at the turbo should be easy enough

well, if there's little room then you're already ahead of yourself by using steampipe bends.

they have a much tighter radius than normal exhaust bend sections - so clearance will be easier to achieve...and if you're still running out of room then i suggest you go 4into1.

try to get the shortest amount pipe between your head and your turbo. this keeps the exhaust gasses hot and expanding which will aid in spool up time. obviously, the difference between a 30cm header and a 35cm header is going to be bugger-all but the difference between, say, a 20cm header and a 40cm header will be noticeable.

anyways, post up some pics . i'm always interested in different header designs and the advantages/disadvantages each design has.

yea thanks for that guys, i may have to redesign my intake side of things or maybe get the grinder into action on a few of the exhaust bends so the inlet bends clear. i think i made it hard for myself because its all so close to the block because im trying to keep the fuel passage as short and uninterupted of bends and no spots fuel can puddle up in. Hey 1200rc what clutch are you running, i need an upgrade my stocker wont cope already slips slightly on standard a12. At he moment im just going to tack it all with the arc then mig it at work. The only reason i did four to two to one is because i had the bends to make it look tough and should be good because hopefully there may be some pulse effect like extractors, i dont no really just wanted to make soomething different to the proven log design i have done previously.

hmmm sounds like suck through, why not blow??? that would be something diffrent

im using an a15 Heavy Duty clutch which is listed for vanettes, hasnt slipped on me but didnt get much use with the turbo system yet, unfamilia posted up the exact part numbers for it a little while ago, if you need the numbers you maybe able to search for em, it's a PBR kit, i have been getting em cheaply at $100 but dont expect to have to pay too much more than that, maybe upto 150

To avoid puddles forming....Maybe u should use one plate for intake and exhaust. DOOOOO NOt cut the plate. This will mean that the intake manifold will warm up thus decreasing the likelyhood of fuel sticking to the inlet manifold.

Of course this will reduce the density of air entering the engine.....

Quote:

what???? why?????

i dot see what you mean?

He means puddles of fuel forming in the inlet manifold. Thats why he is thinking to keep the manifold one so that the heat of the exhaust manifold goes into the inlet.