I did it!!!!!

[payne5757]

Straight pipe is gonna have less backpressure.

[TwinTurboStroker]

Originally Posted by payne5757

Straight pipe is gonna have less backpressure.

No the cat and DPF are gutted and they are huge the DPF could probably hold two footballs. So a straight pipe would have more back pressure, because I was told that the sensors might need a certain amount of back pressure to not go into regen mode, but is just a possibility...

[barry1me]

Originally Posted by TwinTurboStroker

No the cat and DPF are gutted and they are huge the DPF could probably hold two footballs. So a straight pipe would have more back pressure, because I was told that the sensors might need a certain amount of back pressure to not go into regen mode, but is just a possibility...

what you need to do is get a buddy that has a 6.4L have someone splice some transducers into the inlet and outlet tubes and record the pressure differences all through out the rpm range and all different engine loadings. You want to be able to record when the engine isnt in regen mode. This will take some work, and a lot of head scratching, but if you can figure this out you will be the man

[payne5757]

Originally Posted by TwinTurboStroker

No the cat and DPF are gutted and they are huge the DPF could probably hold two footballs. So a straight pipe would have more back pressure, because I was told that the sensors might need a certain amount of back pressure to not go into regen mode, but is just a possibility...

Backpressure is created by restrictions and change of flow in the exhaust. I understand these are large chambers that are now empty but they are still going to contribute to back pressure along with the muffler. Straight smooth tube will outflow uneven tube of the same size. If large empty chambers outflowed straight smooth tubes, then top fuelers would have something like a coffee can on each zoomy. If backpressure is truly what triggers the regen, I dont undestand why it would read more backpressure now then before they were gutted though. If I were u, Id PM the guy on here that said he works in R&D of these things.

[lilredpowerstroke]

Kinda makes you wish you just would have put a straight pipe with the bungs welded in huh??

[freekyFX4]

I am sure that in a few years, there will be cats and DPF's off these trucks laying in every garage of every person who has a truck like this. It's just a matter of time before the exhaust companies figure out how to get around the engine managemnt issues. The key is to be patient and wait for them to do it.

[barry1me]

Originally Posted by payne5757

Backpressure is created by restrictions and change of flow in the exhaust. I understand these are large chambers that are now empty but they are still going to contribute to back pressure along with the muffler. Straight smooth tube will outflow uneven tube of the same size. If large empty chambers outflowed straight smooth tubes, then top fuelers would have something like a coffee can on each zoomy. If backpressure is truly what triggers the regen, I dont undestand why it would read more backpressure now then before they were gutted though. If I were u, Id PM the guy on here that said he works in R&D of these things.

your right. There will be less backpressure without the scr and the dpf, thus the pressure inlet/outlet tubes will not be within there normal opperating range. If I understand this correctly ford put a failsafe in the ecm to overwrite backpressure targets, and work on duty cycles as well.

[jngreen]

if it is still in constant regen mode then try unplugging the batteries for awhile.... see if that resets anything

[rankroddin250]

my theory is that even tho the sensors are now fooled so they dont trigger a regeneration the computer is still set on a timer of some sort that will cause the truck to regenerate regardlessof the back preasure readings... posibly the trick to strait piping the 6.4 may actualy have to be done with custom engine tuning to keep the truck from going into regen period... perhaps some of the top tuners such a SCT will eventualy have this option available with their tuner? untill then major exhaust modifications on the 6.4 may be a no go no atter what any one tries thats just my theory.

and i was going to suggest the battery disconect to reset the compooper but JNgreen beat me to it LOL

[barry1me]

Originally Posted by rankroddin250

my theory is that even tho the sensors are now fooled so they dont trigger a regeneration the computer is still set on a timer of some sort that will cause the truck to regenerate regardlessof the back preasure readings... posibly the trick to strait piping the 6.4 may actualy have to be done with custom engine tuning to keep the truck from going into regen period... perhaps some of the top tuners such a SCT will eventualy have this option available with their tuner? untill then major exhaust modifications on the 6.4 may be a no go no atter what any one tries thats just my theory.

and i was going to suggest the battery disconect to reset the compooper but JNgreen beat me to it LOL

thats pretty much what I think too.

Originally Posted by barry1me

your right. There will be less backpressure without the scr and the dpf, thus the pressure inlet/outlet tubes will not be within there normal opperating range. If I understand this correctly ford put a failsafe in the ecm to overwrite backpressure targets, and work on duty cycles as well.