VE and BSFC - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 16 (permalink) Old 10-02-2007, 07:19 AM Thread Starter
 
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VE and BSFC

Working on learning to calculate turbo sizing.

For our engines, what are the best numbers for volumetric efficiency, and brake specific fuel consumption to use?

Thanks
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post #2 of 16 (permalink) Old 10-02-2007, 07:21 AM
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Re: VE and BSFC

I use about 80% when I am calculating that is at 3200 rpms.
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post #3 of 16 (permalink) Old 10-02-2007, 07:21 AM Thread Starter
 
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Re: VE and BSFC

Also, what are normal Intake Manifold Temps with a stock intercooler?
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post #4 of 16 (permalink) Old 10-02-2007, 07:22 AM Thread Starter
 
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Re: VE and BSFC

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I use about 80% when I am calculating that is at 3200 rpms.
80% VE, that's pretty low we must drive outdated old pigs

What about BSFC
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post #5 of 16 (permalink) Old 10-02-2007, 07:34 AM
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Re: VE and BSFC

2 gallons a hr at idle
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post #6 of 16 (permalink) Old 10-02-2007, 07:34 AM
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Re: VE and BSFC

This turbo stuff is pretty interesting. Check out this link, it's pretty informative.

http://www.turbobygarrett.com/turbob...o_tech103.html
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post #7 of 16 (permalink) Old 10-02-2007, 07:35 AM
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Re: VE and BSFC

I know what you are doing and I have been there with those turbo calculators.Im gonna ust leave it the pro's
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post #8 of 16 (permalink) Old 10-02-2007, 07:39 AM
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Re: VE and BSFC

I agree, it's still pretty neat trying to figure all this stuff out. Really helps you understand how a turbocharged system works.
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post #9 of 16 (permalink) Old 10-02-2007, 07:39 AM Thread Starter
 
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Re: VE and BSFC

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Originally Posted by RockinJW View Post
This turbo stuff is pretty interesting. Check out this link, it's pretty informative.

http://www.turbobygarrett.com/turbob...o_tech103.html
It is cool huh! Just the tip of the iceberg, wait til you get the book and it tells you how to do it for twins.

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I know what you are doing and I have been there with those turbo calculators.Im gonna ust leave it the pro's

Not me
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post #10 of 16 (permalink) Old 10-02-2007, 12:28 PM
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Re: VE and BSFC

If you're talking about the HP books version that explains sizing compounds in the "Tractor Pulling" section, that is wrong.

I believe it is meant as a seat-of-the-pants ballpark method and not a valid calculation tool.

If that's the book you're reading you'd be best to put it down now while your mind is still fresh and pick up a good copy of Maximum Boost by Corky Bell.

I'm serious.


Oh, and I use 75% at 3000rpm, and 80% at 2800, 85% at 2500.

It's a 2v head with #### ports. Sure that's still pretty conservative, but I don't like surging turbos so I will always lean that way.

And what do you care about BSFC? This isn't a gasser, we aren't running Stoich.... (you cannot size a diesel turbo based on a presumed Air:Fuel) Diesels usually require a much bigger turbo for comparable power of a gasser. (Once again, rpm advantage of the gasser)

Good Luck.
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