how will open headers affect?
Thread Starter
Instructor
Joined: Aug 2007
Posts: 224
Likes: 1
From: SHERMAN TEXAS
how will open headers affect?
I Got My Car Running Again And Until I Get To The Muff Shop I Have Been Playing Around With Open Headers. It Doesnt Seem To Have Any Low End Torque Until 3500 Then It Comes Alive. Is There A Technical Explanation Why That Is?
Pro
Joined: Nov 2007
Posts: 741
Likes: 1
From: Woodstock GA
Too little backpressure, possibly reversion...the exhaust ports aren't being as efficiently scavenged. A well designed exhaust system literally pulls the exhaust out...without it, at lower velocity there is a tendency for exhaust gases to be pulled back in. I'm sure someone here has a more scientific explanation, but that is basically what is happening.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
uncapped headers cause the motor to lean out. I usually went a couple of jet sizes bigger. you can back down the timing a couple of degrees.
All motors can be tuned to make the most power with uncapped headers. I couldn't stand driving around like that....... Way to much noise and vibration. I've driven to the drag races with just my collector extensions in place and i was nearly deaf when I got there.
All motors can be tuned to make the most power with uncapped headers. I couldn't stand driving around like that....... Way to much noise and vibration. I've driven to the drag races with just my collector extensions in place and i was nearly deaf when I got there.
