FVD HEADER REVIEW 991#1
03-04-2018, 06:15 PM
#31
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Did you do the same research into the plenum and/or throttle body? Which specific ones are you looking into? I could definitely consider it now that you said sound. I'll be getting a pro-tune anyways, another 5whp can't hurt.
Doing your own labor is really key; I wish I had the space and the skills (honestly I could acquire the skills/tools, I'm an engineer by training but space in ny metro area is like unobtanium) - my shop though is usually reasonably priced thank God.
Yeah you're preaching to the choir I literally bought this car because Carreras went turbo
Doing your own labor is really key; I wish I had the space and the skills (honestly I could acquire the skills/tools, I'm an engineer by training but space in ny metro area is like unobtanium) - my shop though is usually reasonably priced thank God.
Yeah you're preaching to the choir I literally bought this car because Carreras went turbo
IPd is the only one that makes the plenum. I have a hookup on these if you’re interested, PM me.
03-04-2018, 09:12 PM
#33
Larger diameter exhaust and intake parts do not = more power. They often produce the opposite.
I don't like being the professor in threads like this so I would encourage people interested in mods to look up concepts like volumetric efficiency and cylinder filling. The wider the intake and exhaust ports and manifolds, the slower the intake and exhaust gasses flow, the less fuel/air and exhaust moves into and out of the combustion chamber, and the less power you make. In a NA engine, when it comes to intake gasses, you need not just capacity (diameter), but velocity. And you get velocity by constricting airflow, not enlarging it.
Think about putting your thumb over the end of a garden hose -- the water flows at a higher velocity as you reduce the diameter of the passage through which it flows. This is four-stroke engine 101 level stuff. Bolting up bigger headers or a bigger throttle body will usually not make power -- not unless the engine has design flaws or you've modified other parts of the engine so that bigger intake/exhaust becomes necessary. An engine is a system, and all the parts have to be designed to work with each other.
Turbos of course are a different story, and with them you can just dial up the boost and make huge power gains.
I don't like being the professor in threads like this so I would encourage people interested in mods to look up concepts like volumetric efficiency and cylinder filling. The wider the intake and exhaust ports and manifolds, the slower the intake and exhaust gasses flow, the less fuel/air and exhaust moves into and out of the combustion chamber, and the less power you make. In a NA engine, when it comes to intake gasses, you need not just capacity (diameter), but velocity. And you get velocity by constricting airflow, not enlarging it.
Think about putting your thumb over the end of a garden hose -- the water flows at a higher velocity as you reduce the diameter of the passage through which it flows. This is four-stroke engine 101 level stuff. Bolting up bigger headers or a bigger throttle body will usually not make power -- not unless the engine has design flaws or you've modified other parts of the engine so that bigger intake/exhaust becomes necessary. An engine is a system, and all the parts have to be designed to work with each other.
Turbos of course are a different story, and with them you can just dial up the boost and make huge power gains.
03-04-2018, 09:32 PM
#34
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Larger diameter exhaust and intake parts do not = more power. They often produce the opposite.
I don't like being the professor in threads like this so I would encourage people interested in mods to look up concepts like volumetric efficiency and cylinder filling. The wider the intake and exhaust ports and manifolds, the slower the intake and exhaust gasses flow, the less fuel/air and exhaust moves into and out of the combustion chamber, and the less power you make. In a NA engine, when it comes to intake gasses, you need not just capacity (diameter), but velocity. And you get velocity by constricting airflow, not enlarging it.
Think about putting your thumb over the end of a garden hose -- the water flows at a higher velocity as you reduce the diameter of the passage through which it flows. This is four-stroke engine 101 level stuff. Bolting up bigger headers or a bigger throttle body will usually not make power -- not unless the engine has design flaws or you've modified other parts of the engine so that bigger intake/exhaust becomes necessary. An engine is a system, and all the parts have to be designed to work with each other.
Turbos of course are a different story, and with them you can just dial up the boost and make huge power gains.
I don't like being the professor in threads like this so I would encourage people interested in mods to look up concepts like volumetric efficiency and cylinder filling. The wider the intake and exhaust ports and manifolds, the slower the intake and exhaust gasses flow, the less fuel/air and exhaust moves into and out of the combustion chamber, and the less power you make. In a NA engine, when it comes to intake gasses, you need not just capacity (diameter), but velocity. And you get velocity by constricting airflow, not enlarging it.
Think about putting your thumb over the end of a garden hose -- the water flows at a higher velocity as you reduce the diameter of the passage through which it flows. This is four-stroke engine 101 level stuff. Bolting up bigger headers or a bigger throttle body will usually not make power -- not unless the engine has design flaws or you've modified other parts of the engine so that bigger intake/exhaust becomes necessary. An engine is a system, and all the parts have to be designed to work with each other.
Turbos of course are a different story, and with them you can just dial up the boost and make huge power gains.
03-04-2018, 09:32 PM
#35
Banned
Larger diameter exhaust and intake parts do not = more power. They often produce the opposite.
I don't like being the professor in threads like this so I would encourage people interested in mods to look up concepts like volumetric efficiency and cylinder filling. The wider the intake and exhaust ports and manifolds, the slower the intake and exhaust gasses flow, the less fuel/air and exhaust moves into and out of the combustion chamber, and the less power you make. In a NA engine, when it comes to intake gasses, you need not just capacity (diameter), but velocity. And you get velocity by constricting airflow, not enlarging it.
Think about putting your thumb over the end of a garden hose -- the water flows at a higher velocity as you reduce the diameter of the passage through which it flows. This is four-stroke engine 101 level stuff. Bolting up bigger headers or a bigger throttle body will usually not make power -- not unless the engine has design flaws or you've modified other parts of the engine so that bigger intake/exhaust becomes necessary. An engine is a system, and all the parts have to be designed to work with each other.
Turbos of course are a different story, and with them you can just dial up the boost and make huge power gains.
I don't like being the professor in threads like this so I would encourage people interested in mods to look up concepts like volumetric efficiency and cylinder filling. The wider the intake and exhaust ports and manifolds, the slower the intake and exhaust gasses flow, the less fuel/air and exhaust moves into and out of the combustion chamber, and the less power you make. In a NA engine, when it comes to intake gasses, you need not just capacity (diameter), but velocity. And you get velocity by constricting airflow, not enlarging it.
Think about putting your thumb over the end of a garden hose -- the water flows at a higher velocity as you reduce the diameter of the passage through which it flows. This is four-stroke engine 101 level stuff. Bolting up bigger headers or a bigger throttle body will usually not make power -- not unless the engine has design flaws or you've modified other parts of the engine so that bigger intake/exhaust becomes necessary. An engine is a system, and all the parts have to be designed to work with each other.
Turbos of course are a different story, and with them you can just dial up the boost and make huge power gains.
That isn't to say it cannot be improved, but for the best experience a full and complete package might be the best way to do...and most costly.
03-04-2018, 11:09 PM
#36
RL Community Team
Rennlist Member
Rennlist Member
Larger diameter exhaust and intake parts do not = more power. They often produce the opposite.
I don't like being the professor in threads like this so I would encourage people interested in mods to look up concepts like volumetric efficiency and cylinder filling. The wider the intake and exhaust ports and manifolds, the slower the intake and exhaust gasses flow, the less fuel/air and exhaust moves into and out of the combustion chamber, and the less power you make. In a NA engine, when it comes to intake gasses, you need not just capacity (diameter), but velocity. And you get velocity by constricting airflow, not enlarging it.
Think about putting your thumb over the end of a garden hose -- the water flows at a higher velocity as you reduce the diameter of the passage through which it flows. This is four-stroke engine 101 level stuff. Bolting up bigger headers or a bigger throttle body will usually not make power -- not unless the engine has design flaws or you've modified other parts of the engine so that bigger intake/exhaust becomes necessary. An engine is a system, and all the parts have to be designed to work with each other.
Turbos of course are a different story, and with them you can just dial up the boost and make huge power gains.
I don't like being the professor in threads like this so I would encourage people interested in mods to look up concepts like volumetric efficiency and cylinder filling. The wider the intake and exhaust ports and manifolds, the slower the intake and exhaust gasses flow, the less fuel/air and exhaust moves into and out of the combustion chamber, and the less power you make. In a NA engine, when it comes to intake gasses, you need not just capacity (diameter), but velocity. And you get velocity by constricting airflow, not enlarging it.
Think about putting your thumb over the end of a garden hose -- the water flows at a higher velocity as you reduce the diameter of the passage through which it flows. This is four-stroke engine 101 level stuff. Bolting up bigger headers or a bigger throttle body will usually not make power -- not unless the engine has design flaws or you've modified other parts of the engine so that bigger intake/exhaust becomes necessary. An engine is a system, and all the parts have to be designed to work with each other.
Turbos of course are a different story, and with them you can just dial up the boost and make huge power gains.
03-05-2018, 12:25 AM
#37
Good stuff. I have a 991S X51, I am interested if sports cats/headers and/or an IPD plenum would have similar benefits on my car. I am not sure what is left in the X51/GTS cars but I assume a good set of headers might make a difference.
03-05-2018, 09:48 AM
#40
