piping
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- Apprentice
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piping
hello guys, what's the best size exhaust piping for a 4speed triptronic fto ?
- Bennoz
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- Bennoz
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Well standard its 2.25.
You only get a minor gain by just swapping the piping, you get better power from high flow cats and extractors combined with the bigger piping.
And you'll get more from an exhaust if you have done the intake as well. The engine is just a pump, make it breathe & exhale better, it will go better.
You only get a minor gain by just swapping the piping, you get better power from high flow cats and extractors combined with the bigger piping.
And you'll get more from an exhaust if you have done the intake as well. The engine is just a pump, make it breathe & exhale better, it will go better.
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- Fulltiltorgasm
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Close, but your extractors (aka headers) "ARE" the start of your exhaust sytem. They are pipe looking things that take the exhaust gases from the engine to the exhaust pipe.Fulltiltorgasm wrote:extractor/headers take the exhaust from the engine block down to the start of your exhaust systemCassf88 wrote:whats an extractor ?
*learning time*
- col2560
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- Fulltiltorgasm
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I8A4RE wrote:Close, but your extractors (aka headers) "ARE" the start of your exhaust sytem. They are pipe looking things that take the exhaust gases from the engine to the exhaust pipe.Fulltiltorgasm wrote:extractor/headers take the exhaust from the engine block down to the start of your exhaust systemCassf88 wrote:whats an extractor ?
*learning time*
yeah very true i was just trying to simplify it for the young lass
- Fulltiltorgasm
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extremely high combustion = high pressure thus the idea of enlargening the exhaust so more can escape, which means that at high rpms the engine can work harder (not as restricted)Cassf88 wrote:i love you guys
thanks
Edit: how do the fumes know to go down the pipe? im assuming theres like a fan or is does it just pressurise?
- chuster
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Excuse me if ive intepreted this wrong but i think Cass is asking why do exhaust gases go down the extractors/headers not the benefits of having aftermarket extractors.Fulltiltorgasm wrote:extremely high combustion = high pressure thus the idea of enlargening the exhaust so more can escape, which means that at high rpms the engine can work harder (not as restricted)Cassf88 wrote:i love you guys
thanks
Edit: how do the fumes know to go down the pipe? im assuming theres like a fan or is does it just pressurise?
Its coz of a difference in pressure between the exhaust gases in the cylinders and the tip of your exhaust, high pressure gases move to low pressure areas hence get blown out the exhaust.
- I8A4RE
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Half correct, also though you have more gases coming from the engine so it has to go somewhere.chuster wrote:Excuse me if ive intepreted this wrong but i think Cass is asking why do exhaust gases go down the extractors/headers not the benefits of having aftermarket extractors.Fulltiltorgasm wrote:extremely high combustion = high pressure thus the idea of enlargening the exhaust so more can escape, which means that at high rpms the engine can work harder (not as restricted)Cassf88 wrote:i love you guys
thanks
Edit: how do the fumes know to go down the pipe? im assuming theres like a fan or is does it just pressurise?
Its coz of a difference in pressure between the exhaust gases in the cylinders and the tip of your exhaust, high pressure gases move to low pressure areas hence get blown out the exhaust.
Think of it, as benny says "a engine is like a pump. It sucks air in one end and pushes it out the other. If your exhaust was a plastic bag it would keep filling up till it exploaded, as it has no where to go. However your exhaust is not like that its like a straw, so if you blow on a straw, the air is pushed out the end.
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so like osmosis but with fumes?chuster wrote:
Its coz of a difference in pressure between the exhaust gases in the cylinders and the tip of your exhaust, high pressure gases move to low pressure areas hence get blown out the exhaust.
fulltiltorgasm-- i still understand what u mean, so when ppl say dont get a 3in pipe why is that? i know, its 'overkill' n ive heard that from other places not just this forum, but then why do suppliers sell it?
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*Tech talks*
Pipe size is directly relevant to the cubic capacity of the motor (ie 2 litre, 3.5 litre etc) and is also directly relevant to whether or not the engine has forced induction such as a turbo.
On naturally aspirated engines (non turbo) such as the FTO motor, the piping size is much more critical. As the exhaust mixture exits the comubstion chamber (in the head of the engine) it goes into the exhaust header in 'pulses' - ie as the piston forces the exhaust gas out, it comes out in a certain volume at a certain speed. When you have 6 cylinders all pulsing out exhaust gas wads, they need to be merged from the 6 cylinders to 1 exhaust pipe. In the FTO's case, each head has 3 cylinders, so we get 2 banks of 3 cylinders merging together, then we get the 2 banks merging into one.
As the gasses all merge together, it creates almost a gas equilibrium effect or a neutral pressure if you will. That pressure within the system keeps the gas pulse merging at the right speeds. Sorta like a a whole bunch of traffic merging into 1 lane, each car letting the next in.
If you are to put piping on that's too big, then you loose that back pressure & the merging of the gas pulses become gas collisions. Gas collisions of course screw up the whole flow-on effect & effectively cause the motor to struggle to get the gas out right & which causes a power loss at the end of the day.
Hope that helps!
Pipe size is directly relevant to the cubic capacity of the motor (ie 2 litre, 3.5 litre etc) and is also directly relevant to whether or not the engine has forced induction such as a turbo.
On naturally aspirated engines (non turbo) such as the FTO motor, the piping size is much more critical. As the exhaust mixture exits the comubstion chamber (in the head of the engine) it goes into the exhaust header in 'pulses' - ie as the piston forces the exhaust gas out, it comes out in a certain volume at a certain speed. When you have 6 cylinders all pulsing out exhaust gas wads, they need to be merged from the 6 cylinders to 1 exhaust pipe. In the FTO's case, each head has 3 cylinders, so we get 2 banks of 3 cylinders merging together, then we get the 2 banks merging into one.
As the gasses all merge together, it creates almost a gas equilibrium effect or a neutral pressure if you will. That pressure within the system keeps the gas pulse merging at the right speeds. Sorta like a a whole bunch of traffic merging into 1 lane, each car letting the next in.
If you are to put piping on that's too big, then you loose that back pressure & the merging of the gas pulses become gas collisions. Gas collisions of course screw up the whole flow-on effect & effectively cause the motor to struggle to get the gas out right & which causes a power loss at the end of the day.
Hope that helps!
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