Could you loose some low end by gutting your cats?
When you gut the cats, your remove the very last bit of back pressure , or velocity in the exhaust.
Just wondering if anybody else experienced this.
Gutted Cats
Moderator: mikel
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HemiHorsePower
- Posts: 156
- Joined: Thu Aug 23, 2007 8:17 pm
Gutted Cats
06 Ram 1500, LT Headers with Gutted Cats, Spartan Cam, CNC Heads W/ 6.1 Pushrods, CAI, 180*Therm, Magnaflow 40 series, Innovate Wideband, Flex-a-Lite E-Fan, Sharadon Stage 3 Valve Body, APS 2400 Stall T/C, DS U7137.
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Black05Hemi
- Posts: 72
- Joined: Tue Oct 02, 2007 6:12 pm
RE: Gutted Cats
Velocity is what you want, not backpressure...Cats are a restriction in the exhaust system
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HemiHorsePower
- Posts: 156
- Joined: Thu Aug 23, 2007 8:17 pm
Re: RE: Gutted Cats
How is velocity created?Black05Hemi wrote:Velocity is what you want, not backpressure...Cats are a restriction in the exhaust system
Think it drove better with the cats. Driving in the city, non wot, it doesn't feel like it has as much low end
Can that be right?
06 Ram 1500, LT Headers with Gutted Cats, Spartan Cam, CNC Heads W/ 6.1 Pushrods, CAI, 180*Therm, Magnaflow 40 series, Innovate Wideband, Flex-a-Lite E-Fan, Sharadon Stage 3 Valve Body, APS 2400 Stall T/C, DS U7137.
RE: Re: RE: Gutted Cats
Anything is possible, but open headers is the fastest and best mileage. Cats are restrictive and even hiflow cats lose a little power.
My 08 Hemi Ram has the Cats bolted right behind the exhaust manifolds which is the worst place to put them. Any obstruction (like cats) decreses velocity by curving the flow and changing the angles of flow.
As soon as the valve opens there is a Sonic/Shockwave that travels down the pipe at extreme speed (past the speed of sound) and then the flame front comes down the pipe later. As these sonic and thermal pulses hit collectors, X pipes and joints sometimes the wavefronts cause suction for the pulses coming down the pipes behind and sometimes these wavefronts cause pressure - that's what headers are for ... to improve the flows and help create beneficial suction pulses to help PULL the exhaust out of the engine.
Cats = Bad. Carbon Canisters = Bad. Open headers = Good
Ted
My 08 Hemi Ram has the Cats bolted right behind the exhaust manifolds which is the worst place to put them. Any obstruction (like cats) decreses velocity by curving the flow and changing the angles of flow.
As soon as the valve opens there is a Sonic/Shockwave that travels down the pipe at extreme speed (past the speed of sound) and then the flame front comes down the pipe later. As these sonic and thermal pulses hit collectors, X pipes and joints sometimes the wavefronts cause suction for the pulses coming down the pipes behind and sometimes these wavefronts cause pressure - that's what headers are for ... to improve the flows and help create beneficial suction pulses to help PULL the exhaust out of the engine.
Cats = Bad. Carbon Canisters = Bad. Open headers = Good
Ted