I am curious if anyone has I asked exhaust cutouts on their truck yet? The delete option is a thing of the past unless you like to gamble or have a gasser. So I was thinking about putting a cutout in front of the dpf. There would need to be some programming so that it only opens at .. say 80% throttle. Sports cars do this so it should be free game for the trucks right? The idea and concept is really appealing to me because i really only care about having extra power and sound when I'm putting my foot into it. Otherwise im perfectly happy with the way it is stock.

 

your biggest issue is going to be the programming cause no major diesel tuner will touch this cause you would be bypassing the emissions. Im not sure how much the ecu would freak out if you just bypass the dpf. as far as cars doing it and it being fine. its still technically illegal to bypass emissions and in pa you technically would fail inspection with cutouts.. the advantage gas engines have is the ecu doesnt change the tune much if post cat readings are out of wack. the air fuel is adjusted on the precat O2 sensor.

 

You would have to have some sort of tune or else you would get codes and probably derate. With no signal from the EGT probes or other sensors in there it would probably cause some issues. Then you would have to switch the tune back to factory emissions equipped when it is closed. Just my thoughts on it.......

 

I guess I didn't consider the fact that the sports car manufacturers are only bypassing the muffler not the cats. There is no emission inspections for where I live but I'm sure it could be a problem trading it in. Vehicle performance and regulation is a life long game. 20 years ago police were handing tickets out every chance they got for loud exhaust. Today I don't hear of anyone getting bothered about their exhaust unprovoked. Heck, some factory cars come with systems which are practically straight pipe.

I'm sure someone could come up with the right tricky words and catch phrases to justify a tune needed for bypassing the dpf. On a gasser it is called a "test pipe" and those are still being sold and tunes are still being provided for those.

 

They do have "test pipes" for diesels. Company's sold tunes "For off road use only". The idiots rolling coal everywhere are responsible for the crackdown. Still plenty of "off road use only" tuners and test pipes out there so feel free to do your thing.

 

You are basically describing deleting your truck but just leaving the exhaust components intact and adding a cutout. You would have to have the same tuning as anyone that's deleted their truck. You would just have exhaust dumped under your truck, which would end up in your cab.

 

I was under the impression that the term deleted ment removing the EGR & DPF system. The idea I'm entertaining is leaving the emissions in tact and only utilizing a tune under heavy throttle. Giving you the extra power only when you really need/ want it. 90% of the time the trucks stock 900+ lb-ft should be more than adequate. For that reason, I don't see any reason to completely remove the emissions.
I agree discharging the exhaust under the cab is not ideal. It would probably be best to run a bypass around the filter.

 

I pondereed about this idea a few months back. It is possible. Easiest is to run SOTF tuning so you can switch between on and off tuning. Rather that just a cutout I would build or buy a custom switch valve. When you flip switch to offroad mode it would change calibration and operator the valve rerouting the exhaust to another pipe dumped like hidden tucked up pointed out the bedside. When it switches over I would want to completely stop any exhaust flow thru the DPF as it would be disabled.

 

Ok, I see what you are saying. I'm not aware of anyone that offers tuning that will work with or without emissions on the truck (at the same time). For what you want to achieve, a "one off", custom, partial delete tune doesn't sound like it would the best option. I'd suggest you just look into custom tuning with a SOTF (Shift On The Fly) switch that enables you to swap between tunes. There are a couple of tuning systems that allow very impressive HP and torque gains while leaving the emissions systems intact. They do not produce as much HP and torque as the deleted tunes, but they are still very impressive. Also, I can tell you that in my experience with deleted tunes, the highest HP tunes usually produce the best MPG's. If you can restrain your right foot that is! LOL

 

The SOTF is not a bad idea at all, and I'm sure it's a lot cheaper than custom tuning. Although custom tunes will optimize the trucks performance.

I bought my 6.0 already deleted and tuned which was a learning experience. The programmer it came with was SCT which came loaded with some preloaded generic tunes and 1 custom tune. There's no telling who made the custom tune but it performed way better than the SCT generics. Any time I would change a tune it would scramble the trans brain for about 50 miles. The only tune that didn't do this was that custom tune.

Does the trans have to relearn itself every time you change a tune with these SOTF tunes?

 

The instructions we were given said to initially drive the truck easy (not full throttle) for 100 miles once the tunes were installed. After that, I haven't noticed any issues swapping between tunes. But, normally the truck is left set on one tune. We're not really into switching the tunes, it was just an option included with the EZ Lynk system we purchased.

 

I'll have to look into tuners to see which are able to avoid that relearning sequence. It was such a hassle to plan around changing tunes. I'm guessing the custom tune I had on the 6.0 also included a trans tune which is why it didn't act up. I didn't tow the camper with that though because everything I read says not to tow with a hot tune.

Talking thru this with you guys I've come to the conclusion that this is probably not very economical. I'd be looking at either a custom hybrid tune that runs with emissions until the top of the power curve. Or a tune package that has 1 for emissions and 1 without. Either way the problem falls back on the fact id be looking for a tuner willing to program for no emissions.

 

I dont think its possible to do a sotf partial delete. When you do the delete you have to at minimum unplug a bunch of stuff on your egr so it stops working. Ideally you want to remove it completely and add the block off plates in one of the kits. Its my understanding you have to either full delete or leave on the full emissions. Im in Canada so I dont have those emissions test things so im lucky and could delete.

 

You can do a DPF back 5 inch that gets rid of the little stock muffler too. I think there are some emissions legal tunes out there and that may help rumble, at least at idle.

These trucks really dont sound good deleted. I have a big *** muffler on my truck and left the 4 inch parts. Not a fan of the hiss or V8 diesel scream. But it does sound pretty mean when pulling a heavy trailer out of a mud hole or up a hill at moderate rpm.

 

methionalinjection will get you extra power that can be adjusted as needed.