Cheap 52mm TB
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Joined: Jan 2008
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From: Sioux Falls, SD
If you get too much air in, you will lose low end without the appropriate engine updates/modifications to handle the extra air.
On the other end of the engine, if you get to big of exhaust pipes, the air will start to cool too quickly before it exits the end of the pipe. Then you have an engine trying to push cold (colder = increased density = heavier) air out of the pipe rather than hot, less dense air. Thats why the largest you should go with a 5.2L or 5.9L V8 is a single 3"/3.5" or dual 2.25"/2.5". Any more than that without other upgrades/modifications to help, and you're actually to big and will lose power rather than gain it.
Many call this "lack of backpressure", which is the incorrect term for it, but most people know what you're talking about when you say that. The correct term would be more along the lines of "to much air density".
isn't bigger better?On the other end of the engine, if you get to big of exhaust pipes, the air will start to cool too quickly before it exits the end of the pipe. Then you have an engine trying to push cold (colder = increased density = heavier) air out of the pipe rather than hot, less dense air. Thats why the largest you should go with a 5.2L or 5.9L V8 is a single 3"/3.5" or dual 2.25"/2.5". Any more than that without other upgrades/modifications to help, and you're actually to big and will lose power rather than gain it.
Many call this "lack of backpressure", which is the incorrect term for it, but most people know what you're talking about when you say that. The correct term would be more along the lines of "to much air density".
Last edited by jasonw; Apr 11, 2009 at 01:47 AM.
All Star
Joined: Feb 2007
Posts: 946
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From: EL CAMPO, TX
If you get too much air in, you will lose low end without the appropriate engine updates/modifications to handle the extra air.
On the other end of the engine, if you get to big of exhaust pipes, the air will start to cool too quickly before it exits the end of the pipe. Then you have an engine trying to push cold (colder = increased density = heavier) air out of the pipe rather than hot, less dense air. Thats why the largest you should go with a 5.2L or 5.9L V8 is a single 3"/3.5" or dual 2.25"/2.5". Any more than that without other upgrades/modifications to help, and you're actually to big and will lose power rather than gain it.
Many call this "lack of backpressure", which is the incorrect term for it, but most people know what you're talking about when you say that. The correct term would be more along the lines of "to much air density".
On the other end of the engine, if you get to big of exhaust pipes, the air will start to cool too quickly before it exits the end of the pipe. Then you have an engine trying to push cold (colder = increased density = heavier) air out of the pipe rather than hot, less dense air. Thats why the largest you should go with a 5.2L or 5.9L V8 is a single 3"/3.5" or dual 2.25"/2.5". Any more than that without other upgrades/modifications to help, and you're actually to big and will lose power rather than gain it.
Many call this "lack of backpressure", which is the incorrect term for it, but most people know what you're talking about when you say that. The correct term would be more along the lines of "to much air density".
Captain
Joined: Mar 2007
Posts: 632
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From:
If you get too much air in, you will lose low end without the appropriate engine updates/modifications to handle the extra air.
On the other end of the engine, if you get to big of exhaust pipes, the air will start to cool too quickly before it exits the end of the pipe. Then you have an engine trying to push cold (colder = increased density = heavier) air out of the pipe rather than hot, less dense air. Thats why the largest you should go with a 5.2L or 5.9L V8 is a single 3"/3.5" or dual 2.25"/2.5". Any more than that without other upgrades/modifications to help, and you're actually to big and will lose power rather than gain it.
Many call this "lack of backpressure", which is the incorrect term for it, but most people know what you're talking about when you say that. The correct term would be more along the lines of "to much air density".
On the other end of the engine, if you get to big of exhaust pipes, the air will start to cool too quickly before it exits the end of the pipe. Then you have an engine trying to push cold (colder = increased density = heavier) air out of the pipe rather than hot, less dense air. Thats why the largest you should go with a 5.2L or 5.9L V8 is a single 3"/3.5" or dual 2.25"/2.5". Any more than that without other upgrades/modifications to help, and you're actually to big and will lose power rather than gain it.
Many call this "lack of backpressure", which is the incorrect term for it, but most people know what you're talking about when you say that. The correct term would be more along the lines of "to much air density".
rather than just saying it's better or not.
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From: Sioux Falls, SD
mcss8541, TMS Bill is correct, 52mm is the correct size for the 5.9L V8. I have that engine and the Fastman 52mm, which is basically equivalent to the one thats up for auction here.
http://www.thefastman.com/Throttlebodies5x.asp
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From: Sioux Falls, SD
Just an update for anyone interested... it went for $101.51.
