I need an exhaust manifold for my RHD 13B REW single twin-scroll turbo swap (probably Greddy TD07S 25g). The steering column reduces the available space and the only off-the shelf manifold that might fit, the Turblown TBREW8 Turblown REW Swapped Rx-8 Turbo Manifold , puts the turbo in the wrong place and will cost me well over $2,000 with a new downpipe (the one I have won't fit with the turbo's new position), tax and delivery. There are custom builders over here, but again I'm looking at big money and will probably have to do the design work myself.
I'm therefore designing and building my own manifold, relying on buying and cutting up the tubes, bends (90 deg and 45 deg) and flanges and getting a professional to do the welding, followed by ceramic coating. However, I've been butting my head up against various dead ends over getting what I want without throwing shedloads of money at it, starting with Stainless 321 (very limited supply in the UK, no pre-formed bends, v v expensive) then Stainless 304 (lots of 1.5mm walled stuff; limited supplies of 2mm+ wall tube, what there is v expensive and I can find no off-the-shelf bends). Carbon steel would be far easier to make but I'm frightened by heat issues (it'll have to cope with the higher temperature of rotary exhaust gasses and the inlet manifold is far too close for comfort even with ceramic coatings).
I'm aware of the many pitfalls such as turbo weight, poor welds, cracking and heat distortion of the flanges. I'm also thinking hard over the runner diameters. I was leaning towards 1.5" for each to reduce turbo lag but am concerned over the 2" ID exhaust ports on my engine.
Before I spend hours of my time and loads of cash hunting further, can anyone give me their thoughts and some info on the manifold they're using?
Thanks for any help.
I'm therefore designing and building my own manifold, relying on buying and cutting up the tubes, bends (90 deg and 45 deg) and flanges and getting a professional to do the welding, followed by ceramic coating. However, I've been butting my head up against various dead ends over getting what I want without throwing shedloads of money at it, starting with Stainless 321 (very limited supply in the UK, no pre-formed bends, v v expensive) then Stainless 304 (lots of 1.5mm walled stuff; limited supplies of 2mm+ wall tube, what there is v expensive and I can find no off-the-shelf bends). Carbon steel would be far easier to make but I'm frightened by heat issues (it'll have to cope with the higher temperature of rotary exhaust gasses and the inlet manifold is far too close for comfort even with ceramic coatings).
I'm aware of the many pitfalls such as turbo weight, poor welds, cracking and heat distortion of the flanges. I'm also thinking hard over the runner diameters. I was leaning towards 1.5" for each to reduce turbo lag but am concerned over the 2" ID exhaust ports on my engine.
Before I spend hours of my time and loads of cash hunting further, can anyone give me their thoughts and some info on the manifold they're using?
Thanks for any help.
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