exuast size
10-05-2005, 04:56 PM
#3
lol cmon man you make some of the stupidest posts that can be found by looking around... no offernse to you but why are you asking. if your still doing that turbo project do 3" otherwise go 2.5" heck even 2.25" piping if just fine for NA -Ryan
10-05-2005, 07:15 PM
#16
Originally Posted by brad kay
werd. gotta keep some back-pressure there hass lol.
But there is use of the word 'backpressure'. 
Backpressure is a terrible word that shows a lack of understanding of how a tuned exhaust system really works. The correct terminology is 'Exhuast Gas Velocity' which you do want a certain amount of. And although some of those guys think you have a poorly setup exhaust, I choose to dissagree without solid proof and taking into account the future path in which you intend to take your car.
Backpressure is a terrible word that shows a lack of understanding of how a tuned exhaust system really works. The correct terminology is 'Exhuast Gas Velocity' which you do want a certain amount of. And although some of those guys think you have a poorly setup exhaust, I choose to dissagree without solid proof and taking into account the future path in which you intend to take your car.
.....
10-05-2005, 07:32 PM
#19
Originally Posted by brad kay
werd. gotta keep some back-pressure there hass lol.
BACKPRESSURE = TORQUE?
An old hot-rodder's tall tale: Engines need some backpressure to work properly and make torque. That is not true. What engines need is low backpressure, but high exhaust stream velocity. A fast-moving but free-flowing gas column in the exhaust helps create a rarefaction or a negative pressure wave behind the exhaust valve as it opens. This vacuum helps scavenge the cylinder of exhaust gas faster and more thoroughly with less pumping losses. An exhaust pipe that is too big in diameter has low backpressure but lower velocity. The low velocity reduces the effectiveness of this scavenging effect, which has the greatest impact on low-end torque.
An old hot-rodder's tall tale: Engines need some backpressure to work properly and make torque. That is not true. What engines need is low backpressure, but high exhaust stream velocity. A fast-moving but free-flowing gas column in the exhaust helps create a rarefaction or a negative pressure wave behind the exhaust valve as it opens. This vacuum helps scavenge the cylinder of exhaust gas faster and more thoroughly with less pumping losses. An exhaust pipe that is too big in diameter has low backpressure but lower velocity. The low velocity reduces the effectiveness of this scavenging effect, which has the greatest impact on low-end torque.
IBTL!
10-05-2005, 07:45 PM
#20
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Posts: n/a
^^
yeah.. i was just kind of taking it to extreme measures for the sake of making a point? lol i dono i need to denote sarcasm better with the things i type. However, my point was that at a certain point you lose all backpressure and that is not a good thing. You might want your backpressure to be low, but you certainly need to have some. a 3'' pipe would not bring you to this critical area necessarily, but that was just what i was getting at in general.
IBTL![/QUOTE]
yeah.. i was just kind of taking it to extreme measures for the sake of making a point? lol i dono i need to denote sarcasm better with the things i type. However, my point was that at a certain point you lose all backpressure and that is not a good thing. You might want your backpressure to be low, but you certainly need to have some. a 3'' pipe would not bring you to this critical area necessarily, but that was just what i was getting at in general.
IBTL![/QUOTE]
10-06-2005, 10:55 PM
#23
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2.5 in exhaust provides enough backpressure for the N/A cars. However with a turbo setup, a 3 in. is recommended for the power its going to put out. Less restrictive (less back pressure) will gain your high end speed. if you have all this money to blow, then get a 2.5 in, n then get a 3 in when you have your turbo. Just make sure you read up all about turbos. I was going to do it to my car, then i realized how much of a pain it will be n i wouldn't have time to take care of the turbo. If youre going to take it to a shop everytime it needs to be taken care of, just remember that you're going to spend a lot of money on labor. Remember a turbo needs to be tuned and looked after time to time. Make sure that you are willing to dish out a wad of cash even AFTER having the turbo. There are alot of things that are needed, not just the turbo kit....
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