twin scroll vs single scroll
What is the difference between single scroll and twin scroll?
Also what does the factory Subaru impreza wrx 2001 turbo come in? thanks |
The way I understand it and I guess nut shelled ;
A twin scroll design essentially splits the exhaust gasses going into the turbo in order to combat the exhaust gasses from opposing combustion strokes colliding with each other. Essentially it reduces lag, increases flow into the turbo and produces better torque. Only the JDM STI were factory fitted with them afaik. using the Perth-WRX mobile app |
Factory bugeye turbo is a TD04
using the Perth-WRX mobile app |
[QUOTE=Brett Allan;831986]The way I understand it and I guess nut shelled ;
A twin scroll design essentially splits the exhaust gasses going into the turbo in order to combat the exhaust gasses from opposing combustion strokes colliding with each other. Essentially it reduces lag, increases flow into the turbo and produces better torque. Only the JDM STI were factory fitted with them afaik. using the Perth-WRX mobile app[/QUOTE] i thought the turbine housing was split into 2 sections. one has a small A/R to get the turbo spinning. And the other section has a large A/R for more peak flow. Dunno if this is correct, just how i imagined it would work? |
[QUOTE=Bram;831989]i thought the turbine housing was split into 2 sections. one has a small A/R to get the turbo spinning. And the other section has a large A/R for more peak flow. Dunno if this is correct, just how i imagined it would work?[/QUOTE]
That sounds better. My explanation was how it was explained to me a while ago. So probably not very accurate :o using the Perth-WRX mobile app |
never seen much difference in the large turbos, some of the sti spec C came with the twin scroll, but you need the correct headers to take advantage, plus change the sump if its an early model
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Not worth the gains vs $$$ but Twinscroll sounds so much better imho
unless you can source all the parts cheap sump, dip stick, header, turbo, dump Stick with a vf34 and call it a day |
Totally agree with Rexxar, to how much better twinscroll sounds. When I first changed everything over I was a little bit apprehensive, but after the run in and first heard the car over 6K RPM, I wouldn't want it to sound like it used to again.
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I will throw the cat amongst the pigeons. Whilst twin scroll is meant to promote early boost it is also meant to generate lower ultimate power compared to single scrolls.
Open to evidence on this. |
[QUOTE=Kremer930;832011]I will throw the cat amongst the pigeons. Whilst twin scroll is meant to promote early boost it is also meant to generate lower ultimate power compared to single scrolls.
Open to evidence on this.[/QUOTE] i guess it's a trade off.. earlier torque for less peak power in the top end (?) |
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