You cant do that sadly. When you put the Race tune on your car and delete, only GM can retune for DPF/Urea injection, even Fleece cant, ask them.BTW they said that their experienced techs take about 2 hours to install the race downpipe, race tune and EGR block-off plates, and that the downpipe only could be done in about 45-minutes by an experienced tech or owner. So you could literally drive to the track, swap out the DPF for the race downpipe, load the race tune then race and swap it back for the drive home with only around an hour and a half of extra time needed... Just a thought...
Yes, im working on a plan to find a good fabricator to make me a custom 3" downpipe and full exhaust using these parts : Vibrant Performance ::.I do wish the downpipe was bigger. Definitely should be able to fit a bigger one in there - which will make for less backpressure...turbo happier, more power, etc...
I do wish the downpipe was bigger. Definitely should be able to fit a bigger one in there - which will make for less backpressure...turbo happier, more power, etc...
Yes, im working on a plan to find a good fabricator to make me a custom 3" downpipe and full exhaust using these parts : Vibrant Performance ::.
And it will be Ceramic coated too. :th_dblthumb2:
3-inch seems like overkill to me! My 6.6L Duramax engine came with a 3.5-inch exhaust system and funky downpipe. I believe the aftermarket downpipe is either 3.5 or 4-inch and the rest of the exhaust is 4-inch and my truck runs a MUCH larger turbo AND is putting down 540 HP and 1000 lbs-ft TQ.Yeah, a full 3" back setup I think would be the most optimal.
Since a Turbo car, nothing after the turbo is best. Since i cant put nothing, i will go biggest possible!3-inch seems like overkill to me! My 6.6L Duramax engine came with a 3.5-inch exhaust system and funky downpipe. I believe the aftermarket downpipe is either 3.5 or 4-inch and the rest of the exhaust is 4-inch and my truck runs a MUCH larger turbo AND is putting down 540 HP and 1000 lbs-ft TQ.
OZTuner sized the downpipe appropriately for the turbine outlet, I highly doubt you would see ANY measurable improvement from a larger downpipe... I suppose it goes well with a ricer/gasser mentality, but a larger diameter downpipe is not at all needed for the 2.0L turbo diesel engine. Even with a larger turbo or compounds I think it would be fine with this downpipe...
Exactly.Since a Turbo car, nothing after the turbo is best. Since i cant put nothing, i will go biggest possible!
Look at video from one of the best for more infos : http://www.cruzetalk.com/forum/9-general-discussion/197690-turbo-straight-pipe-best.html
Since a Turbo car, nothing after the turbo is best. Since i cant put nothing, i will go biggest possible!
Look at video from one of the best for more infos : http://www.cruzetalk.com/forum/9-general-discussion/197690-turbo-straight-pipe-best.html
I understand what you are saying, but again in this specific application I do not think it is necessary or worth the effort or investment. If 6.6L of Duramax diesel with a MUCH larger turbo works VERY well with 3.5 and 4-inch exhaust making 500-1000 HP, I think we'll be fine making less than 200 HP with a baby turbo and only 2.0L of engine!!!Exactly.
Plenty of Cobalt SS/TCs see gains from going up from the stock 2.5" exhaust and downpipe up to a 3", especially when they're tuned. I'm running a 2.5" on mine, and it doesn't even have a turbo. If I move up to a TVS 1320, a 3" downpipe and catback will be required, not just because it's cool.
It's a turbo car - as mentioned above - the less backpressure the better. Even though the downpipe is sized to the turbo outlet, you've got a couple 90 degree bends in there...a larger diameter will make those less of a impediment to flow.
You are talking fruits and vegetables not even close enough to apples and oranges in comparison!!!! Gas engines are completely different critters than diesel engine. Intake is completely different that turbine outlet. And finally normally aspirated is completely different than turbo charged... Adding air volume on an intake tract is a great way to help throttle response as well as HP, but again it is totally different that the turbine outlet of a turbo to speak about the intake of a NA gasser.Moving from a 2.5" to 3" exhaust sure worked pretty well on a 1.4T Dodge Dart. Making less power than a tuned 2.0TD Cruze, and about half the torque. And that's still on the stock downpipe.
2.5 vs 3 inch exhaust - Page 3
Keep in mind - with a hood stack, there's no back pressure because it's not that long - it comes out of the turbo and ends. That's fine. But you start adding turns in...you're killing flow. On the opposite end of the spectrum - LT1 Fbodies...switching from a stock-routed CAI, which has two 90 degree turns to the LS1-style lid, which is a straight shot - huge improvement. By your logic, if the CAI was the same size as the TB, it doesn't matter about the bends. But boy does it. Big time.
Any chance he'd also be interested in doing a dyno comparison with the two?For those of you interested... I have a guy at work that is really considering building larger downpipes for the CTD, completely stainless steel, and larger diameter. They'll cost more than $265, but it will be substantially higher quality. He already has an established business as a down pipe / exhaust fabricator for the whole Volvo and WRX world. If any of you are interested... Look up 8Eight Fab on facebook.
So I guess the fact I'm an automotive mechanical engineer with a thesis that dealt entirely in fluid dynamics (with an advisor who was the fluid dynamics professor) means I'm just "a forum poster". I wasn't aware I didn't actually know what I was talking about, wow!I trust those engineers much more than any forum posters when it comes to performance diesel applications.
My car will be the test car... so it's possible, I will have to find a local Dyno(I know where one is, just not sure if they are open to the public or just for their own tuning purposes, it's a LS performance shop)... But I would be more than willing.Any chance he'd also be interested in doing a dyno comparison with the two?
