1st Gen. Ram - All Topics Discussion for all Dodge Rams prior to 1994. This includes engine, drivetrain and non-drivetrain discussions. Anything prior to 1994 should go in here.

Turbo Question

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Old Aug 25, 2006 | 12:16 PM
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Boatnik's Avatar
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From: Smithfield, VA
Turbo Question

I am in a heated discussion with one of the Dodge truck owners here in my shop. THe argument is over pressure ratio between the exhaust manifold and the intake manifold on the CTD. What is the relationship between the two and where can I find it.
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Old Aug 25, 2006 | 12:34 PM
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I believe it should as close to 1:1 as possible.
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Old Aug 25, 2006 | 12:57 PM
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Ideally, intake manifold pressure could be made with no exhaust manifold pressure/restriction at all. Sadly, this isn't the case. 1:1 is nice and anything below that is even better. To answer the question (as best I can) the overall pressure ratio of the system at 'x' intake manifold pressure is based on the combination of the turbine housing and exhaust housing sizes. The ratio itself constantly changing, based on engine load/speed etc. my best guess, hehe.
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Old Aug 25, 2006 | 06:24 PM
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And a very accurate guess, too.
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Old Aug 26, 2006 | 12:48 PM
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From: Graham, Washington
Originally Posted by G1625S
Ideally, intake manifold pressure could be made with no exhaust manifold pressure/restriction at all. Sadly, this isn't the case. 1:1 is nice and anything below that is even better. To answer the question (as best I can) the overall pressure ratio of the system at 'x' intake manifold pressure is based on the combination of the turbine housing and exhaust housing sizes. The ratio itself constantly changing, based on engine load/speed etc. my best guess, hehe.
Right on and understanable also.

Greg
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