Drive Pressure - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 7 (permalink) Old 04-03-2009, 04:06 PM Thread Starter
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Drive Pressure

Can I check drive pressure on just one bank or do I need to combine sensing lines to both banks to be accurate?

At what point (ratio) does drive pressure need to be wastegated off? What is acceptable and what is excessive?

What is more important, getting drive pressure down to a 1-1 ratio or running a compressor within its map, or is this the same thing?
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post #2 of 7 (permalink) Old 04-03-2009, 05:31 PM
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Re: Drive Pressure

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Originally Posted by 907DAVE View Post
What is more important, getting drive pressure down to a 1-1 ratio or running a compressor within its map, or is this the same thing?
running a compressor within its map will (in general) keep the drive pressure down to reasonable levels. Most people get high drive pressure when they start getting into the less efficient areas of the compressor. This means more energy is required to compress the volume of air, most commonly seen as high drive pressure.

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post #3 of 7 (permalink) Old 04-03-2009, 11:45 PM Thread Starter
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Re: Drive Pressure

Can I check drive pressure on just one bank or do I need to combine sensing lines to both banks to be accurate?

At what point (ratio) does drive pressure need to be wastegated off? What is acceptable and what is excessive?
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post #4 of 7 (permalink) Old 04-04-2009, 01:53 AM
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Re: Drive Pressure

If you notice the stock turbo will make 20-23psi failry efficiently, then it will make 25psi boost until it comes apart.

At 20 IIRC the backpressure was close to a 1:1 but when you max it out on the exhaust side the back pressure climbs and the boost goes nowhere. At this point it is requiring more horsepower to drive the turbine than it is giving back in map pressure.

Think of the engine as an air compressor, does it take the same size motor to make 20psi as it does to make 60psi? No, the more the backpressure the more the parasitic loss. This is why I never understood unhooking the wastegate.

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post #5 of 7 (permalink) Old 04-04-2009, 02:20 AM
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Re: Drive Pressure

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Originally Posted by 907DAVE View Post
Can I check drive pressure on just one bank or do I need to combine sensing lines to both banks to be accurate?

At what point (ratio) does drive pressure need to be wastegated off? What is acceptable and what is excessive?

What is more important, getting drive pressure down to a 1-1 ratio or running a compressor within its map, or is this the same thing?
You have two 1/8 npt ports on the top of your TN pedestal. Take your drive pressure readings for the small turbo from one of those.

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post #6 of 7 (permalink) Old 04-04-2009, 02:04 PM
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Re: Drive Pressure

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Originally Posted by hotstik View Post
You have two 1/8 npt ports on the top of your TN pedestal. Take your drive pressure readings for the small turbo from one of those.
thats the best place to check it.

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post #7 of 7 (permalink) Old 04-04-2009, 03:12 PM
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Re: Drive Pressure

Well, I didn't know he was so well equipped.

Those TN setups are top notch. I would come out and tee them together so that you are reading both banks if it is a divided inlet setup.

How do you guys running this integrating a wastegate? Is it part of the turine or something in the up pipes.

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