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Why Don't Big Rigs Use Bov's?

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Old 08-08-2003, 12:37 PM
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Might be a stupid question... But don't they run a lot of boost? Or just a huge snail and low boost?
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Old 08-08-2003, 12:46 PM
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dont they use recirculation valves like the 300zx TT's? that is what i thougt.....



hey justin.....do you know neone who owns a BB fd that is in the vicinity of troy IL, i rode through town last saturday on my way home with the new car, and while stopping to see my brother justin, i saw a stock looking fd at a small pub.....



louis
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Old 08-08-2003, 12:52 PM
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Well. I guess the boost pressure is prettylow.. since the trucks rev very little..
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Old 08-08-2003, 12:57 PM
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Originally Posted by r_xplicit' date='Aug 8 2003, 11:46 AM
dont they use recirculation valves like the 300zx TT's? that is what i thougt.....



hey justin.....do you know neone who owns a BB fd that is in the vicinity of troy IL, i rode through town last saturday on my way home with the new car, and while stopping to see my brother justin, i saw a stock looking fd at a small pub.....



louis
Yup! He owns the pub. Right on the corner right?
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Old 08-08-2003, 01:01 PM
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They're not low pressure, NTC 350 cummins runs 18lbs of boost. The 400 is around 27lbs if I remember right.



Keep in mind that a 400 cummins can put out 800hp at the wheels reliably so overboost isn't going to harm the engine in the short term.



The turbos on those things are so finely tuned it's not even funny. Never really thought about a BoV or much when I was working on them.
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Old 08-08-2003, 01:08 PM
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Originally Posted by 75 Repu' date='Aug 8 2003, 12:52 PM
Well. I guess the boost pressure is prettylow.. since the trucks rev very little..
*shakes head*
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Old 08-08-2003, 01:11 PM
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Originally Posted by Rotarydragon' date='Aug 8 2003, 10:01 AM
They're not low pressure, NTC 350 cummins runs 18lbs of boost. The 400 is around 27lbs if I remember right.



Keep in mind that a 400 cummins can put out 800hp at the wheels reliably so overboost isn't going to harm the engine in the short term.



The turbos on those things are so finely tuned it's not even funny. Never really thought about a BoV or much when I was working on them.
Beat me too it. My uncle has a truck. They run some pretty high boost numbers.
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Old 08-08-2003, 01:14 PM
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Geez.. I guess I now have to go pay attention to my brothers freightliner.. That fookin snail is huge. But my bro's truck is only good for like 400 to 500 HP.. somewhere around there..
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Old 08-08-2003, 01:15 PM
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Originally Posted by Rotarydragon' date='Aug 8 2003, 12:01 PM
They're not low pressure, NTC 350 cummins runs 18lbs of boost. The 400 is around 27lbs if I remember right.



Keep in mind that a 400 cummins can put out 800hp at the wheels reliably so overboost isn't going to harm the engine in the short term.



The turbos on those things are so finely tuned it's not even funny. Never really thought about a BoV or much when I was working on them.
Hmmm... Good info. I never really thought about it much, but since my car is down I listen to any rig I can just for the turbo... But then I noticed there is no blow off... So I figured I would ask...



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Old 08-08-2003, 01:22 PM
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yeah, the pub is right on a corner.......about a mile form te interstate 55s........near a damn corn field.....my brother lives like a block down from there......



lou
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