Single or Dual Exhaust... Which one for performance?
#26
02-07-2005
#28
02-07-2005
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Location: Coal Region, MTC to be exact...heart of the coal region.
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Quote:
Originally Posted by optikal illushun
How bout a big fat NO. u are still wrong bro. i dont see how u say im contridicting myself either .
larger exhaust pipe=less exhaust velocity. this makes the engine push harder to get the exhaust out, u loose scavenging ability.
Do you know how "scavenging" works??? Last I checked no one was properly tuning a motor to take advantage of a larger exhaust tract diameter on this site...
Where did i say that "tuning" for larger pipes was better?
Quote:
Originally Posted by optikal illushun
WRONG. backpressure is evil, end of the story. its when u boost the size in exhaust pipe u loose the exhaust velocity, that kills low end torque but helps high end power.
Quote:
Originally Posted by optikal illushun
Whenever back pressure can be reduced, the engine can then be tuned to make more power, regardless of rpm range.
THAT is COTRADICTING... You say loss of velocity, which is directly related to the piping size, will kill low end torque-help high end power but then, you change your mind and go on to say that it will make more power REGARDLESS of rpm range... Tell me how that is in agreement with itself?
that second part is not my own words, but its true. most factory exhausts are restrictive. opening them up a little helps performance. going to far kills performance, finding the happy medium is key.
Quote:
Originally Posted by optikal illushun
larger exhaust pipe=less exhaust velocity. this makes the engine push harder to get the exhaust out, u loose scavenging ability.
This makes no sense. The engine would have to breath harder to get all the spent gases out with a smaller size piping, this is what you call backpressure. Backpressure promotes an efficient scavenging rate sooner in the rpm range and directly promotes low end torque gain through the lower section of the powerband.
http://www.proficientperformance.com...k_pressure.php
ur missing the point here.
backpressure is no good in an engine regardless of size. but the reason u loose low end power is because of the increase of exhaust pipe diameter. the larger the pipe the more then engine needs to work to get the exhaust gases out.
Originally Posted by optikal illushun
How bout a big fat NO. u are still wrong bro. i dont see how u say im contridicting myself either .
larger exhaust pipe=less exhaust velocity. this makes the engine push harder to get the exhaust out, u loose scavenging ability.
Do you know how "scavenging" works??? Last I checked no one was properly tuning a motor to take advantage of a larger exhaust tract diameter on this site...
Where did i say that "tuning" for larger pipes was better?
Quote:
Originally Posted by optikal illushun
WRONG. backpressure is evil, end of the story. its when u boost the size in exhaust pipe u loose the exhaust velocity, that kills low end torque but helps high end power.
Quote:
Originally Posted by optikal illushun
Whenever back pressure can be reduced, the engine can then be tuned to make more power, regardless of rpm range.
THAT is COTRADICTING... You say loss of velocity, which is directly related to the piping size, will kill low end torque-help high end power but then, you change your mind and go on to say that it will make more power REGARDLESS of rpm range... Tell me how that is in agreement with itself?
that second part is not my own words, but its true. most factory exhausts are restrictive. opening them up a little helps performance. going to far kills performance, finding the happy medium is key.
Quote:
Originally Posted by optikal illushun
larger exhaust pipe=less exhaust velocity. this makes the engine push harder to get the exhaust out, u loose scavenging ability.
This makes no sense. The engine would have to breath harder to get all the spent gases out with a smaller size piping, this is what you call backpressure. Backpressure promotes an efficient scavenging rate sooner in the rpm range and directly promotes low end torque gain through the lower section of the powerband.
You need to have the least amount of backpressure possible to produce maximum power. Too large of diameter exhaust will cause a power loss and loss of low end torque because a larger pipe has less exhaust stream velocity than a smaller pipe. If the exhaust pipe is too large, then the exhaust flow will be slowed with less velocity.
ur missing the point here.
backpressure is no good in an engine regardless of size. but the reason u loose low end power is because of the increase of exhaust pipe diameter. the larger the pipe the more then engine needs to work to get the exhaust gases out.
Last edited by optikal illushun; 02-07-2005 at 07:51 AM.
#31
02-07-2005
Originally Posted by John Moorehead
FWIW, I had a dual straight-piped setup originally on my truck.
2.25" main pipe, split into two 2" pipes the remainder of the way.
Sounded good, but like Bob said, I lost backpressure. Now, I've got a single 2.5" system, and I immediately noticed a return in extra bottom-end grunt. And it's pretty loud, too. You can't sneak up on anyone, lol.
2.25" main pipe, split into two 2" pipes the remainder of the way.
Sounded good, but like Bob said, I lost backpressure. Now, I've got a single 2.5" system, and I immediately noticed a return in extra bottom-end grunt. And it's pretty loud, too. You can't sneak up on anyone, lol.
#32
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Scallion02EDGE
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11-15-2005 11:04 AM
