Effecting Performance ?
#1
Effecting Performance ?
ok heres the deal, T25 turbo on a6, well i was running my str8 downpipe for a while and it ran hella smoother it seems before i got it connected to my 2 1/4" exhaust, it has a cat on there and muffler
my question is, how much power am i losing ? i noticed for the first couple days the undercar would smoke when im stopped, was this the underlining burning or was that the cat torching itself into the ground? heh
any help would be great, im about to install a 3" cutout right before the cat, if the cat affects it too much i will just get a full 3" exhaust with no cat. im trying to save money so please only tell me if you really know :P
my question is, how much power am i losing ? i noticed for the first couple days the undercar would smoke when im stopped, was this the underlining burning or was that the cat torching itself into the ground? heh
any help would be great, im about to install a 3" cutout right before the cat, if the cat affects it too much i will just get a full 3" exhaust with no cat. im trying to save money so please only tell me if you really know :P
#4
Re:Effecting Performance ?
Originally Posted by Project CRXtacy
ok heres the deal, T25 turbo on a6, well i was running my str8 downpipe for a while and it ran hella smoother it seems before i got it connected to my 2 1/4" exhaust, it has a cat on there and muffler
my question is, how much power am i losing ? i noticed for the first couple days the undercar would smoke when im stopped, was this the underlining burning or was that the cat torching itself into the ground? heh
any help would be great, im about to install a 3" cutout right before the cat, if the cat affects it too much i will just get a full 3" exhaust with no cat. im trying to save money so please only tell me if you really know :P
my question is, how much power am i losing ? i noticed for the first couple days the undercar would smoke when im stopped, was this the underlining burning or was that the cat torching itself into the ground? heh
any help would be great, im about to install a 3" cutout right before the cat, if the cat affects it too much i will just get a full 3" exhaust with no cat. im trying to save money so please only tell me if you really know :P
The underlining would burn if the exhaust was pointing straight at it, but at idle...seems kinda odd, maybe your running rich at idle?
The best exhaust on a forced induction vehicle, is of course NO exhaust, If I could run with just the O2 housing straight on my car, I would. Gas milage would suck due to the O2 sensor never getting an accurate reading, but hey, if you wanna play you gotta pay right?
Be carefull with those cutouts. Are you running an external or internal wastegate? If your running internal, the odds of you getting boost creep are greater. Also depends on what your displacement is. On 2.0L dsms we get boost creep on running a bigger downpipe, disconnected from the cat. Basically open exhaust. Creep aint pretty.
If youre installing a 3inch exhaust, why go with the cutout? I would just use the 3 inch cutout, and keep the stock exhaust and cat in place. Id also get an electrical cutout for those occasional races.
Good luck
#5
Re:Effecting Performance ?
Originally Posted by DSM Beast
Originally Posted by Project CRXtacy
ok heres the deal, T25 turbo on a6, well i was running my str8 downpipe for a while and it ran hella smoother it seems before i got it connected to my 2 1/4" exhaust, it has a cat on there and muffler
my question is, how much power am i losing ? i noticed for the first couple days the undercar would smoke when im stopped, was this the underlining burning or was that the cat torching itself into the ground? heh
any help would be great, im about to install a 3" cutout right before the cat, if the cat affects it too much i will just get a full 3" exhaust with no cat. im trying to save money so please only tell me if you really know :P
my question is, how much power am i losing ? i noticed for the first couple days the undercar would smoke when im stopped, was this the underlining burning or was that the cat torching itself into the ground? heh
any help would be great, im about to install a 3" cutout right before the cat, if the cat affects it too much i will just get a full 3" exhaust with no cat. im trying to save money so please only tell me if you really know :P
The underlining would burn if the exhaust was pointing straight at it, but at idle...seems kinda odd, maybe your running rich at idle?
The best exhaust on a forced induction vehicle, is of course NO exhaust, If I could run with just the O2 housing straight on my car, I would. Gas milage would suck due to the O2 sensor never getting an accurate reading, but hey, if you wanna play you gotta pay right?
Be carefull with those cutouts. Are you running an external or internal wastegate? If your running internal, the odds of you getting boost creep are greater. Also depends on what your displacement is. On 2.0L dsms we get boost creep on running a bigger downpipe, disconnected from the cat. Basically open exhaust. Creep aint pretty.
If youre installing a 3inch exhaust, why go with the cutout? I would just use the 3 inch cutout, and keep the stock exhaust and cat in place. Id also get an electrical cutout for those occasional races.
Good luck
A nice 2.5 inch exhaust with no crush bends will flow all you needs for that d16. Gut that cat, weld a pipe in it's place, having an open chamber cat will only create back pressure. The best upgrade on any turbo car is the "test pipe" one. No OBD2 on your ride so you're all good.
Keep us posted.
-ryan
#7
Re:Effecting Performance ?
It can make a big difference. I had stock dx exhaust off an lsvtec...it was garbage, felt like a sohc completely offset vtec.
switched that up and it felt like a whole diff motor.
Quandie's advice is on imo. no cutouts no cat/hi flo cat and 2.5
switched that up and it felt like a whole diff motor.
Quandie's advice is on imo. no cutouts no cat/hi flo cat and 2.5
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