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Old 08-13-2009, 07:09 AM   #1 (permalink)
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Question Turbo sizing question?

okay im trying for 400hp and just finished reading maximum boost the other day and going with the formulas in the book i have a max airflow rate of 45lbs/min 10k rpm and a median of 22.5 at 5k with a pressure ratio of 2.7 i have found out by reading the compressor maps of the turbos that i guessed would be in the size range that i need at my max airflow rate at the pressure ratio of 2.7 im around max efficincy for that turbo which is good its normaly around 75% to 80% but at my median airflow im to the left of the surge line almost all the way down from there to the point of 20% of max airflow at a pressure ratio of 1. is this something i should be worried about or something that i should just expect because of the amount of hp im trying to make the closest one i found to being in spec was gt3782 82mm 52 trim .54a/r just looking for some input.
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Old 08-13-2009, 07:48 AM   #2 (permalink)
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anyone???
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Old 08-13-2009, 08:31 AM   #3 (permalink)
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that turbo is HUGE

i would get a 50 trim or 57 trim and call it a day
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Old 08-13-2009, 08:47 AM   #4 (permalink)
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yeah tell me about it but i cant find a compressor map that fits i was just refrencing it because it was the closest map i found
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Old 08-13-2009, 09:13 AM   #5 (permalink)
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that turbo is HUGE

i would get a 50 trim or 57 trim and call it a day
Agreed, 57 trim would def get it done. Depending on your budget, you could look at the S256 as well.
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Old 08-13-2009, 09:24 AM   #6 (permalink)
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the s256 was one of the first maps i looked at and it is close but im still to the left of the surge line slightly
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Old 08-13-2009, 09:28 AM   #7 (permalink)
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hey go-autoworks you wouldnt happen to have a compressor map for the spec turbo on your site would you?
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Old 08-13-2009, 03:24 PM   #8 (permalink)
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You aren't going to be reving to 10K on a mostly stock D-series. So, pull back your pipe dreams and work with 8-8.5K with a spring/cam combo head.
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Old 08-13-2009, 03:27 PM   #9 (permalink)
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Originally Posted by steve11432 View Post
hey go-autoworks you wouldnt happen to have a compressor map for the spec turbo on your site would you?
I"ll get it.

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You aren't going to be reving to 10K on a mostly stock D-series.
This is true...you generally won't rev to 10k on a very built D series

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the s256 was one of the first maps i looked at and it is close but im still to the left of the surge line slightly
The S256 is a great matchup
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Old 08-13-2009, 03:31 PM   #10 (permalink)
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im not planning to go to ten i just want to make sure everthing will be big enough in the turbo system to handle the airflow. and its going to be for a built. also thanks in advance for trying to get the compressor map

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Old 08-14-2009, 11:26 AM   #11 (permalink)
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any word the the compressor map yet?
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