boost woes
Postmaster
Joined: Jan 2004
Posts: 3,207
Likes: 0
From: Kearney, Nebr
you dont loose total boost numbers just because of turbo lag. in my truck i have virtually none, it is actualy more responsive with the cooler then without. the reason the boost numbers drop is because of the fact that you have more volume to fill with the same amount of air. the engine still demands the same amount to run at the same given loads and the turbo cant build as much boost with the "extra" space in the cooler and tubes. you are still putting the same physical amount of air into the engine but it is actualy denser since its colder.
you cant compare our obs truck boost numbers to sd boost numbers. they are 2 different systems. our trucks flow different amounts of fuel, and have larger turbo housings on them. the sd's can flow more fuel and have smaller housings on them and are wastegated.
on a typical obs truck you can expect roughly 2-4 psi drop in boost readings from adding an intercooler depending on which one you install. you have to remember that just because your gauge doesnt go as high it doesnt mean you lost power. the turbo is moving the exact same amount of air into your engine, technicly more just with less boost.
you cant compare our obs truck boost numbers to sd boost numbers. they are 2 different systems. our trucks flow different amounts of fuel, and have larger turbo housings on them. the sd's can flow more fuel and have smaller housings on them and are wastegated.
on a typical obs truck you can expect roughly 2-4 psi drop in boost readings from adding an intercooler depending on which one you install. you have to remember that just because your gauge doesnt go as high it doesnt mean you lost power. the turbo is moving the exact same amount of air into your engine, technicly more just with less boost.
Ditto my friend.
Lead Driver
Joined: May 2007
Posts: 8,608
Likes: 13
From: Belair md
Ok thanx. On the matter of the probe in the down pipe, mine was in the dp but the new one doesnt have a place for it. So i was going to put it into the manifold, has anyone done a write up on this becasue im am very parinoid about getting metal into the turbo. I mean i want a new turbo but i have to tow some stuff on friday and can have it craping the can just yet.
Posting Guru
Joined: Sep 2004
Posts: 1,096
Likes: 2
From: Ohio
Another reason that you may think that your turbo is lagging from the IC is air friction. Since your shoving air thru a finned surface, your forcing air resistance that you did not have otherwise. You will still move the same amount of air from the turbo iteslf, but pressure will decrease becasue of physics. You have a larger area that pressure will be disappaited in, and you will loose air velocity in a samll percentage from the larger area and the finned surface INSIDE the IC. This is the disadvantage to the IC, but it is made up for by the cooling effect on the air, allowing it to be a percentage denser. There was a write up on it here a while ago from a guy that may just be the smartest person I eveer read anything from on ICs. Does anyone have that link?
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Milwaukee,WI
6.0L Power Stroke Diesel
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Jan 15, 2006 01:44 PM
