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  #1  
Old 04-18-2008, 03:10 PM
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Default Turbo epiphany

Ok, i have been reading this book for a coupla years on turbo charging. Lots of info and i have it near memorized and understood.

Or so I thought

Read a coupla paragraphs again and finally see what is being said

I've been concerned bout the P/R of 2.75 that i have computed - the turbo maps just do not like that high a P/R.

Well, the book explains that at a lower than ambient temp of 60F the maps are based on, the colder air produces a higher P/R at a slower compressor speed.

this improves the P/r at 25000 by 10%, it takes 112,000 rpm to get the 60 degree p/r of 125,000 RPM

Good stuff, may already have the temp correction in my formula, have to go figure
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  #2  
Old 04-19-2008, 09:30 AM
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Default Re: Turbo epiphany

I thought all turbo maps were normalized to 85 degrees. You figure out your requirements and normalize them to 85 degrees and then compare turbo maps.
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Old 04-19-2008, 09:56 PM
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Default Re: Turbo epiphany

this book says 60, but that makes it even better - now i can adjust the other part of the map

I can now adjust both axis on the map so i cans read it
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Last edited by Dust : 04-19-2008 at 10:01 PM.
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Old 04-21-2008, 09:56 AM
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Default Re: Turbo epiphany

here is an example or the maps

http://www.turbofast.com.au/FlowT3.html

As you can see the left shows the pressure ratio and the bottom air flow.

I have the formula to adjust air flow at altitude, now i have the formula to adjust the P/R

I will contact Garrett to find out the temp the map was run at
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  #5  
Old 04-22-2008, 09:27 AM
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Default Re: Turbo epiphany

Answer from Garrett
Quote:
The tests are run in our facilities around the globe. Our guidelines state that the compressor inlet uses a corrected temperature of 85 degrees F to create results that allow compressor maps to be compared regardless of the ambient temperatures.

So there it is and for a change an answer that makes me happy
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  #6  
Old 04-23-2008, 08:28 AM
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Default Re: Turbo epiphany

Quote:
Originally Posted by Dust View Post
Answer from Garrett

Quote:
The tests are run in our facilities around the globe. Our guidelines state that the compressor inlet uses a corrected temperature of 85 degrees F to create results that allow compressor maps to be compared regardless of the ambient temperatures.
So there it is and for a change an answer that makes me happy
That's the same answer I gave you.
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  #7  
Old 04-23-2008, 10:00 AM
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Default Re: Turbo epiphany

Sorry to doubt you Mike - the book "turbochargers" by Hugh MacInnes said 60F, when you gonna publish?
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  #8  
Old 05-22-2008, 01:56 PM
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Default Re: Turbo epiphany

Totally cool - garrett came out with a turbo speed sensor - good for 500 to 400,000 RPM

I'm gonna be close to the surge line on the turbo map at altitude - now i can make sure i don't tear them apart

http://www.turbobygarrett.com/turbob...d_sensor.html#

Great stuff
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