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[quote][i]Algselt postitas: Maku[/i] Kaaperdaja juhtis minu tähelepanu ühele S2 foorumi teemale. Tegemist on Marco nimelisega härraga, kes ise keevitas kokku 3" downpipe-i ja ka tegi mõned müügiks. Showed in previous picture is last pipe I've built, which was asked to be without WG merging. I use the showed die grinder and tools to smooth out and polish joints and mergings. Consider a good cutter (in the range of 15-20 euros) will be good for only one pipe: SS is very tough to cut and there is a lot of work to be done in the turbo flange-to-cone area and WG-to-downpipe merging. The cone is about 50-55mm long and its function is to increase duct section from 58mm (turbine outlet) to the 66-72 mm final size fast enaugh, without causing significant turbulences. WG pipe is Ø 42mm ID. I usually start the building from the turbo flange. Before welding the piece (whether it is a straight or a curved piece) I smooth and deburr each side of it, then weld it, cut and polish internal joints before adding following piece. I don't have a TIG welder therefore using an inverter type electrode welding machine. I use high quality #308 SS electrodes (there are cheaper ones, but high quality electrodes make welding much easier). I'm not a professional welder, and I'm aware my welds don't look that good, but they are strong and reliable, apart from the fact I put much more effort on the internal smoothness than the outside look. Some numbers: in my ~370 Hp RS2 setup the full 3" turbo back system with racing cat converter made me gain 20 hp at peak hp rpm, with gains over OEM system starting from 3500 rpm on. Turbine spool up time seemed improved to me as well, while off boost low rpm pick up worstened a little.... as it's supposed to . IMHO good ID exhaust sizes for various engine outputs could be: - Ø 62mm up to 310 hp; - Ø 66mm up to 360 hp; - Ø 72mm up to 430 hp; - Ø 76mm up to 480 hp; - Ø 85mm up to 600 hp; - Ø 95mm up to 800 hp; [b]PS: Pange tähele, et härra ütleb "could be". See ei ole sama, mis "are, should be, must be.."![/b] [/quote]
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Eesti Audi Klubi foorum
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S - Audid
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20vT - tuuning
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Väljalase
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XMB Audi Club Edition
Täiendanud: indro, klem, j6mm & diversion @ 2002-2020
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