# ok providing that..

Posted by Alex (90 300zx) on September 08, 2004 at 10:02:30: In Reply to: been there, done that. seen the numbers myself. Y pipe is fine IF the rest of the engine is running good. nm posted by Matt on September 08, 2004 at 08:10:30: the y pipe does flow more than the factory y pipe AND that were talking about emissions at idle...I can see no reason why emissions would be higher or lower with the only varible being the pipe. Its just an exhaust pipe, there are no holes venting gas into the atmosphere and since the motor is at idle, it is working exactly the same as it would with the stock y pipe. At a fixed idle at say 750rpms the motor produces X ccs of exhaust gasses. The pipe does not adjust the a/f ratio or alter any ecu settings (although i can see the argument that since the pipe is larger and the gasses have more room to move around the o2 sensor, it can be hypothizied that it causes a false lean condition ). With that being said, whatever evidence you have to prove otherwise was most likely just a fluke and due to either a failing emissions component(s) i.e. egr pcv or o2 sensor or due to some atmosphereic anomoly or the testing machine was just messed up. On the other hand, I can also see the argument that since the stock y pipe is more restrictive, the gas actually spends more time in the pipe and therefore more time to burn off excess gases. Just my opinion on the emissions differences between y pipes. But....the point is there actually has to be an explaination for the emissions difference. How many people have noted the difference and have readings from a dmv or something to back it up? Replys: a couple of things.. Matt (93SE) 10:13:23 9/08/2004 (3) what about your o2 sensor? Alex (90 300zx) 10:18:01 9/08/2004 (2) it's working per the FSM, but that doesn't mean it's lagging. replaced 1.5 yrs ago. nm Matt (93SE) 11:12:02 9/08/2004 (1) I dont know how old my O2 is, but its from Jeffys old car ;) MrGone (92se) 12:06:19 9/08/2004 (0)

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: the y pipe does flow more than the factory y pipe AND that were talking about emissions at idle...I can see no reason why emissions would be higher or lower with the only varible being the pipe. Its just an exhaust pipe, there are no holes venting gas into the atmosphere and since the motor is at idle, it is working exactly the same as it would with the stock y pipe. At a fixed idle at say 750rpms the motor produces X ccs of exhaust gasses. The pipe does not adjust the a/f ratio or alter any ecu settings (although i can see the argument that since the pipe is larger and the gasses have more room to move around the o2 sensor, it can be hypothizied that it causes a false lean condition ). With that being said, whatever evidence you have to prove otherwise was most likely just a fluke and due to either a failing emissions component(s) i.e. egr pcv or o2 sensor or due to some atmosphereic anomoly or the testing machine was just messed up. : On the other hand, I can also see the argument that since the stock y pipe is more restrictive, the gas actually spends more time in the pipe and therefore more time to burn off excess gases. : Just my opinion on the emissions differences between y pipes. But....the point is there actually has to be an explaination for the emissions difference. How many people have noted the difference and have readings from a dmv or something to back it up?