Did the X-Pipe make my car slower?
07-11-2009, 01:06 PM
#26
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CLS55 AMG 030
You mentioned two very key words. velocity and savaging. Managing exhaust is just as important as the intake.
If you're running enough boost, I could imagine where open headers would be more beneficial. I'm curious why you're saying that with a roots blower 'you can just run open headers'. That sounds like old-school muscle car mentality where you don't worry about exhaust tuning, but overcome it with more boost. I thought roots was more of a lobe design compared to our screw design. Don't know some of the particulars beyond that and would be quite curious why.
If you're running enough boost, I could imagine where open headers would be more beneficial. I'm curious why you're saying that with a roots blower 'you can just run open headers'. That sounds like old-school muscle car mentality where you don't worry about exhaust tuning, but overcome it with more boost. I thought roots was more of a lobe design compared to our screw design. Don't know some of the particulars beyond that and would be quite curious why.
When you want more power with a roots system ... you put a bigger blower on. Short open headers or individual short pipes work best was always my understanding and has been the practice since long before I was born. Because boost comes on basically right off idle and builds with engine rpm, there's no need for much exhaust tuning because there's no scavenging going on.
I dunno ... maybe I'm wrong. But that's always been the way I understood it.
07-11-2009, 04:43 PM
#27
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CLS55 AMG
That was always my understanding (Though when it comes to SC's it's limited I admit) Because roots systems make positive boost from basically off idle in which case any exhaust tuning or back pressure becomes detrimental.
When you want more power with a roots system ... you put a bigger blower on. Short open headers or individual short pipes work best was always my understanding and has been the practice since long before I was born. Because boost comes on basically right off idle and builds with engine rpm, there's no need for much exhaust tuning because there's no scavenging going on.
I dunno ... maybe I'm wrong. But that's always been the way I understood it.
When you want more power with a roots system ... you put a bigger blower on. Short open headers or individual short pipes work best was always my understanding and has been the practice since long before I was born. Because boost comes on basically right off idle and builds with engine rpm, there's no need for much exhaust tuning because there's no scavenging going on.
I dunno ... maybe I'm wrong. But that's always been the way I understood it.
Exactly.
