you haven't done it, and no one else has documented doing it(swapping out the y-pipe). how do you know this is going to happen? how have you come up with this hypothesis?

 

That's really the whole thing. It's not that the components don't add efficiencies, it's just getting the computer to understand them. For example, getting more in should help performance, but the MPS sensor changes the throttle blade to get back to what it's deemed as the appropriate manifold pressure. Getting colder air should help as well, but the AIT sensor also makes adjustment based on the air temperature.

So a variety of things go on with values the PCM is looking for and unless you know of some way to mess around with it, a programmer is the only route we have to travel. The SC Flashpaq does better with upgrades than the other programmer I used but it's not a full fledged tuner. Even if it was, I'm not sure that I would see any better results.

 

Real simple, I asked an engineer at Superchips why long tubes wasn't supported. Long tubes drastically change the power curve, moving it lower and it would take a full re-write of the SC tunes. With the SC Flashpaq doing better with my short tube headers than my previous programmer and also the stock PCM, that's just somewhere I don't want to go unless I have a true tuning product available for the JK. To date that isn't out there and even if it was, I'll let someone else be the guinea pig.

 

ok, so you never answered my question. you just reiterated why long tube headers aren't supported by superchips. my question was regarding why swapping out y-pipes would throw codes.

 

There are a variety of reasons. Headers will lean out your engine. There are no cats in between the up and down stream O2 sensors. The PCM relies on thee being a difference between them and will throw a code for an out of spec catalytic converter. It can also throw codes thinking that without the cats that an O2 sensor is bad. Then it starts snowballing until your rolling home in limp mode.

I'm just not going there. I've heard the horror stories and there is a reason that the Borla long tubes are labeled as off road use only. It's a federal offense to take them off and drive on public roads. Certainly there are after market cats to make all this fly, but again, I'm just not going there. You're more than welcome to and I'd absolutely love to read about how you made it work. Just not my cup of tea.

 

SOMEBODY has had to have put headers and ypipe, with muffler on their JK!!!
If you look at the Borla sys. it has all the components for this system on the JK, so somebody out there has had to have used it or a system from another company...
All you guys and gals that mod the shit out of you're jeeps and nobody has ever tried this??!!??!!??!!??!!??!!??
Any of you shop owners been down this road?
I guess I'll just have to do it and let you all know how it turns out......

 

Well, I'll intently follow the thread. I'd love to do it myself, but have an understanding of some of the inherent problems. Not that you can't get there, but it's not going to be a picnic.

 

And by the way,,,, if you look, there are TONS of mods of all different type that are labeled "for off road use only" that only keeps the manufacturers ass out of the shit when someone gets dinged from the gov...
My Harley has aftermarket pipes and they are listed as "for off road use only" and I sure as hell aint gonna ride my dresser down no off road trails!!!!
Oh, and My jeep goes off road all the time, so I guess its ok??

 

you're still talking about headers. i'm not talking about long tube headers, and i am not talking about short tube headers. i am talking about the y-pipe. i have not said anything about deleting cats. all i have spoken about is swapping y-pipes. I have not mentioned any companies or products specifically. the point I am trying to make is since no one has done it, you are speculating as to what could happen. You don't have any real quantifiable data regarding a test pipe swap.

Again, this is more speculation on your part without real proof. I now have full control over ignition timing and fuel. I'm using an SMT6 to control what I want. Just an FYI, I am getting 3mpg better than I was with the Superchips.

JPop, I have a bunch of "projects" in the works. I am almost finished with the custom y-pipe I spoke of awhile back. Want some quantifiable data? Come on down.

 

im not sure the motor actually runs lean. the computer might think the motor is running lean but i seriously doubt a set of headers and y pipe will cause a serious lean condition. headers and y pipe is well within the computer's parameters to adjust to any extra air and fuel requirements. however a tuner will provide more control over the stock computer. maybe the utec will/is a better tuner than the superchicps...well i know it is but finding someone to tune a jeep is hard.

if one was to remove the cats all you would have to get is a m.i.l. eliminator which essentially tricks the computer into thinking that whatever the 02 sensor is picking up is within normal conditions. on egt's, on a NA car typically its not that the EGT's are much higher its typically that the wall on the tubes of the headers are thinner than stock, allowing more heat to escape to the engine bay....causing the melting of the wires someone spoke of. stock headers are usually pretty damn thick and heavier as well.


-shaun h