530 hybrids
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
What's the A/R of the exhaust housing from and OBS? I don't know much about the OBS stuff. Van is the same compressor side as a SD turbo, but has a non-wastegated 1.15 A/R turbine housing and slightly larger turbine wheel.
Laughing Gas
Joined: Jul 2004
Posts: 783
Likes: 0
Newb question.. You said about upgrading the valve springs along with the head studs. I know the reason for the studs is to keep the bolts from stretching and blowing out a gasket. But why the springs? As i would think they would need change only if you are reving higher than stock?
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
It's the high boost that comes along with it, plus running in the upper RPM range (not necessarily higher than stock) that can cause the valve float. RPM's alone won't cause float on our trucks...but the combo with high boost can.
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
Right now around 450 RWHP, torque - guessing around 850-900. With the new turbo, HP should be around 500 RWHP and around an even grand for torque.
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
To clarify a little for those who can't see the need for valve springs..-- When you are pushing much more boost than designed for a stock engine, the actual air pressure pushing on the actual valve head can be enough to prevent the valve from closing fully after it opened, or either opening prematurely. Combine that with high engine speeds where this is happening several times as second, and you can start to see how easily a valve could smack a piston.
Posting Guru
Joined: Mar 2007
Posts: 1,842
Likes: 2
From: hillsborough nj
Originally Posted by lukecline
stock obs is 1.15 a/r. its not the same as a superduty van turbo.
glasseater- your playing with fire running that much boost on a stock turbo.
glasseater- your playing with fire running that much boost on a stock turbo.
Posting Guru
Joined: Mar 2007
Posts: 1,842
Likes: 2
From: hillsborough nj
Originally Posted by lukecline
get that intercooler on and it should drop your boost some.
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SolidGround
1999 - 2003 7.3L Power Stroke Diesel
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Apr 16, 2007 11:19 PM
