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Old 09-28-2011, 05:34 AM   #1
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Default Weird question: Twin scroll rear mount turbo

This is not for a Miata.

I'm considering going with a rear mount turbo in another car I own. Is there any benefit to going twin scroll (dual exhaust) when the 'turbo header' is eight feet long?
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Old 09-28-2011, 06:27 AM   #2
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Oh thanks for telling us what car it is, ya bitch.
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Old 09-28-2011, 06:34 AM   #3
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It's for a Mercedes S class. :P
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Old 09-28-2011, 06:53 AM   #4
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OK, actually it a 1990 560SEL. Apparently these motors are good for 700whp stock!
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Old 09-28-2011, 01:01 PM   #5
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I'm pretty sure you are going to lose the benefit of the twin scroll design unless you keep the exhaust gases divided all the way back to the flange. If you do that then I'd guess that it could work. IDK if twinscroll manifolds need to be equal length to work properly, but that would be another thing to consider when covering that kind of distance.
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Old 09-28-2011, 02:58 PM   #6
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If you join the primaries and then run a divided housing, you could crack the middle of the housing. It happens in RX-7 land at least. As mentioned you'd have to keep the manifold separate the entire way back to see any benefit, if there would be any in that case. I know nothing about rear mount turbos, just turbos in general.
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Old 09-28-2011, 05:11 PM   #7
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Well, obviously if you run a twin scroll, you need twin exhaust paths. I mean, that's implied by the name.

It's not that difficult to have a dual exhaust until it reaches the turbo as the car comes stock with a dual exhaust. V8.
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Old 09-28-2011, 06:00 PM   #8
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Quote:
Originally Posted by Nagase View Post
Well, obviously if you run a twin scroll, you need twin exhaust paths. I mean, that's implied by the name.

It's not that difficult to have a dual exhaust until it reaches the turbo as the car comes stock with a dual exhaust. V8.
I know you're kind of a G around these parts, but this is the internet, you never know what you'll run into. We can't always assume you know what you're talking about
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Old 09-28-2011, 09:57 PM   #9
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Given that the pressure pulses would last all the way to the back, with a twin exhaust I would expect a twin scroll to show gains. Just don't put any resonators between the engine and the turbo, that would reduce the pulsations.
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Old 09-28-2011, 10:12 PM   #10
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Top mount blower.
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Old 09-28-2011, 11:17 PM   #11
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Quote:
Originally Posted by JasonC SBB View Post
Given that the pressure pulses would last all the way to the back, with a twin exhaust I would expect a twin scroll to show gains. Just don't put any resonators between the engine and the turbo, that would reduce the pulsations.
Anyone know how far back the pressure pulses do last? just curious
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Old 09-28-2011, 11:28 PM   #12
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Do it. And post vids.
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Old 09-29-2011, 12:48 AM   #13
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It's going to be a long while before this happens. I plan out long term.
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Old 09-29-2011, 01:34 AM   #14
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Quote:
Originally Posted by Zapp View Post
Anyone know how far back the pressure pulses do last? just curious
Just note how loud unmuffled exhaust systems are even with the piping going all the way to the back.
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Old 09-29-2011, 10:38 PM   #15
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The resonators is a good point. If I'll be running cats on this car, there's no point to twin scroll, is there?
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