M7060 full delete

[McMXi]

Personally, I *think* I'd keep the catalytic converter in the system or put a high-flow cat on if the OEM wasn't flowing enough air, but with the DPF after it I can't see how it wouldn't flow enough air when removing the DPF (but I'm certainly no expert).

I've heard that it's easier and less restrictive to remove the catalyst (catalytic converter) and to make a small flange that bolts to the exhaust flange after the turbo and run straight tubing from there.

 

[WI_Hedgehog]

I've heard that it's easier and less restrictive to remove the catalyst (catalytic converter) and to make a small flange that bolts to the exhaust flange after the turbo and run straight tubing from there.

As long as I already own the cat, less fumes is more better? I do like how on an engine tuned the way it should be (not lean) a cat cleans up the incompletely burned fuel so I'm not inhaling it.

 

[McMXi]

As long as I already own the cat, less fumes is more better? I do like how on an engine tuned the way it should be (not lean) it cleans up the incompletely burned fuel so I'm not inhaling it.

With the DPF removed, there's a significant reduction in back pressure downstream of the turbo, so I'd wonder if the catalytic (DOC) is as effective in that configuration. Given the turbo, there's no or little change to the back pressure upstream of it after removing the constriction, so floating valves isn't a concern.

So arguably, removing the DOC would result in more CO and unburned fuel being emitted. But given that tractors without emissions such as the BX outsell the bigger tractors by a significant margin (10:1, 20:1?), does a modified 3.3L 4-cylinder engine produce as much pollution as three BXs?

 

[WI_Hedgehog]

With the DPF removed, there's a significant reduction in back pressure downstream of the turbo, so I'd wonder if the catalytic (DOC) is as effective in that configuration. Given the turbo, there's no or little change to the back pressure upstream of it after removing the constriction, so floating valves isn't a concern.

So arguably, removing the DOC would result in more CO and unburned fuel being emitted. But given that tractors without emissions such as the BX outsell the bigger tractors by a significant margin (10:1, 20:1?), does a modified 3.3L 4-cylinder engine produce as much pollution as three BXs?

Those darn lawnmowers aspiring to be tractors...

I thought the DOC operates by getting "really hot" to burn the unburned (however how much that happens when removing the DPF is definitely my question).