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post #1 of 10 (permalink) Old 11-16-2007, 01:01 AM Thread Starter
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Question drive pressure

any one know what the drive pressure of a stock turbo should be around @30psi boost?

2001 F250
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post #2 of 10 (permalink) Old 11-16-2007, 01:01 AM
 
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Re: drive pressure

With a .84 housing? Probably 70psi
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post #3 of 10 (permalink) Old 11-16-2007, 01:17 AM Thread Starter
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Re: drive pressure

im running 40psi drive at 30psi boost?

2001 F250
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post #4 of 10 (permalink) Old 11-16-2007, 01:18 AM
 
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Re: drive pressure

Then your sensor isn't working properly
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post #5 of 10 (permalink) Old 11-16-2007, 01:50 AM
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Re: drive pressure

How are you measuring it?

Tom

1996 F250 Powerstroke 4X4 AUTO
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post #6 of 10 (permalink) Old 11-16-2007, 02:21 AM
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Re: drive pressure

On a gauge, you will get 55-60psi of drive pressure with a stock .84 housing. Depends on the wastegate, if you have it wired down tight it will give more back pressure, but if you are running more fuel at a higher temperature, you will likely get the same results with a few less pounds of force.

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post #7 of 10 (permalink) Old 11-16-2007, 02:35 AM
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Re: drive pressure

A little off subject kinda..... What is the max ideal back pressure you should run with this motor? I mean any turbo setup where would the "sweat spot" be?
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post #8 of 10 (permalink) Old 11-16-2007, 02:41 AM
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Re: drive pressure

1 to 1 is what you want... but can you get it? Its hard... The Stocker is to about 13#... the 38r is to about 25#'s and the TN drop in is to about 30#'s... I have not tested the TN BB yet...

The 38r with a 1.15 housing is 1 to 1 to about 32#'s

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post #9 of 10 (permalink) Old 11-16-2007, 02:56 AM
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Re: drive pressure

Drive pressure Vs. boost pressure will depend on several things.
1. Steady state vs. accelerating: Accelerating drive pressure will be significantly more than steady state.
2. Exhaust housing: Smaller will have more back pressure until the WG opens.
3. Compressor: WW or similar will have lower drive pressure simply because it doesn't waste power trying to be quiet.
4. Exhaust: Stock will be more restrictive. Any back pressure in the post-turbo exhaust will increase the pre-turbo exhaust back pressure.

That's all I can think of for now

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post #10 of 10 (permalink) Old 11-16-2007, 02:57 AM
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Re: drive pressure

Thanks for the reply. thats what i was looking for. I knew the lower the better but i didnt know what turbo's ran what so i had somthing to compare with.
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