Torque cone question
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Outstanding HDF Member
Joined: Feb 2008
Posts: 2,415
Likes: 8
From: virginia
Torque cone question
So i put a set of torque cones in the 1200 today, it seems as though it has richened it up a lot as in black smoke coming out of the pipes on start up, how did this change the tune and how to correct this with the PC-5
oh and it stalled twice also!!
oh and it stalled twice also!!
Cruiser
Joined: Nov 2010
Posts: 104
Likes: 0
From: west central Texas
If you're talking the traditional torque cones that go between the head and the header, then there's couple things that come to mind from my personal experience with them.
Torque cones by their design are restrictive and can reduce the flow characteristics of the exhaust. If yours are restrictive enough, the air/fuel mix could be richer than it was before you installed them.
It's extremely important when installing the torque cones that the exhaust gaskets stay in place and not move or crush so they protrude into the flow. If they do impede the flow enough, it usually makes the exhaust sound flat and tinny. I've never seen them bad enough to stall the engine though.
I found that going with 1/4-20 eyebolts (lolipops) near the exit ends of each pipe was a better solution to regaining low end torque than going with the torque cones next to the exhaust ports. By turning the eyebolt and changing its angle with regard to the flow, you can tune how much it restricts the flow and also how it affects the reversionary pulses.
Right now, the Bassani pipes I have are good enough in the low end that they don't need anything else.
I'm not familiar with the PC-5 so I can't help you there.
.
Thread Starter
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Outstanding HDF Member
Joined: Feb 2008
Posts: 2,415
Likes: 8
From: virginia
If you're talking the traditional torque cones that go between the head and the header, then there's couple things that come to mind from my personal experience with them.
Torque cones by their design are restrictive and can reduce the flow characteristics of the exhaust. If yours are restrictive enough, the air/fuel mix could be richer than it was before you installed them.
It's extremely important when installing the torque cones that the exhaust gaskets stay in place and not move or crush so they protrude into the flow. If they do impede the flow enough, it usually makes the exhaust sound flat and tinny. I've never seen them bad enough to stall the engine though.
I found that going with 1/4-20 eyebolts (lolipops) near the exit ends of each pipe was a better solution to regaining low end torque than going with the torque cones next to the exhaust ports. By turning the eyebolt and changing its angle with regard to the flow, you can tune how much it restricts the flow and also how it affects the reversionary pulses.
Right now, the Bassani pipes I have are good enough in the low end that they don't need anything else.
I'm not familiar with the PC-5 so I can't help you there.
.
Torque cones by their design are restrictive and can reduce the flow characteristics of the exhaust. If yours are restrictive enough, the air/fuel mix could be richer than it was before you installed them.
It's extremely important when installing the torque cones that the exhaust gaskets stay in place and not move or crush so they protrude into the flow. If they do impede the flow enough, it usually makes the exhaust sound flat and tinny. I've never seen them bad enough to stall the engine though.
I found that going with 1/4-20 eyebolts (lolipops) near the exit ends of each pipe was a better solution to regaining low end torque than going with the torque cones next to the exhaust ports. By turning the eyebolt and changing its angle with regard to the flow, you can tune how much it restricts the flow and also how it affects the reversionary pulses.
Right now, the Bassani pipes I have are good enough in the low end that they don't need anything else.
I'm not familiar with the PC-5 so I can't help you there.
.
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
Putting any kind of restriction in your exhaust will change your tune, so I'm certain this is the problem. If you pull fuel out of the 0% column it may help, but your tune throughout the range is likely to be off enough to warrant a complete revamp of your tune. Personally, I would remove the cones. What were you trying to accomplish with them?
Road Captain
Joined: Feb 2011
Posts: 731
Likes: 7
From: Windsor Ontario
I've yet to read any positive comments from people who have tried them. Let us know your results.
Thread Starter
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Outstanding HDF Member
Joined: Feb 2008
Posts: 2,415
Likes: 8
From: virginia
Putting any kind of restriction in your exhaust will change your tune, so I'm certain this is the problem. If you pull fuel out of the 0% column it may help, but your tune throughout the range is likely to be off enough to warrant a complete revamp of your tune. Personally, I would remove the cones. What were you trying to accomplish with them?
Thanks
P.S why do you think that i should remove them??
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