Compressor Map
09-07-2009, 07:03 AM
#1
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Compressor Map
After reading the FAQ how to read a compressor map I decided to map my own set and attempt to find a good compressor for me. But Im a little confused and hope someone will help.
I calculated my Mass Flow Rate at 60 lb/min and my pressure ratio at 3.43.
When I plot these on any compressor maps I see that I have to run at least a GT40 to be in the efficient zone. Which I thought was was to big, I was thinking maybe a GT35. Are there factors that I am leaving out or that I miss calculated. Let me give you numbers so you can tell me if my calcs are right. I just used general numbers given on the FAQ.
hp goal flywheel = 500
a/f = 12
N = 7800
Vd = 140.3cc
VE = 92%
Tm = 130
Wa = 60
BSFC = .60
I calculated my Mass Flow Rate at 60 lb/min and my pressure ratio at 3.43.
When I plot these on any compressor maps I see that I have to run at least a GT40 to be in the efficient zone. Which I thought was was to big, I was thinking maybe a GT35. Are there factors that I am leaving out or that I miss calculated. Let me give you numbers so you can tell me if my calcs are right. I just used general numbers given on the FAQ.
hp goal flywheel = 500
a/f = 12
N = 7800
Vd = 140.3cc
VE = 92%
Tm = 130
Wa = 60
BSFC = .60
Last edited by amalby; 09-07-2009 at 07:05 AM. Reason: changed the post icon
09-07-2009, 10:01 AM
#2
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Re: Compressor Map
If your not trying to do 500whp on pump gas then there is a wide variety of turbos that will get the job done.
500 crank is going to net you about 420-430 whp and thats attainable on pump gas with a 62-1 or sc61 or some of the new borgwarner stuff. and some other turbos. you dont need a gt40 just contact a turbo dealer and they will give you the info your looking for
500 crank is going to net you about 420-430 whp and thats attainable on pump gas with a 62-1 or sc61 or some of the new borgwarner stuff. and some other turbos. you dont need a gt40 just contact a turbo dealer and they will give you the info your looking for
09-07-2009, 10:36 AM
#3
Re: Compressor Map
Your engine and max rpm are also not accounted for here. for 3.43PR, that is over 34.7 to 34.8psi of boost pressure. I don't think that's what you're trying to get here.
Give me a PM, with all your listed numbers, as well as your engine displacement (engine type would be best)
-Horsepower to the WHEELs that you're looking for,
-What purpose you're using the car for. (street/strip, circuit race, etc)
-Also let me know what flanging (T3 or T4 , or T4 Divided) and exhaust downpipe bolt pattern (4 bolt, V-band) etc.
-Do you want journal or ball-bearing cartridge, and do you know what is involved in each?
-Budget.
Give me a PM, with all your listed numbers, as well as your engine displacement (engine type would be best)
-Horsepower to the WHEELs that you're looking for,
-What purpose you're using the car for. (street/strip, circuit race, etc)
-Also let me know what flanging (T3 or T4 , or T4 Divided) and exhaust downpipe bolt pattern (4 bolt, V-band) etc.
-Do you want journal or ball-bearing cartridge, and do you know what is involved in each?
-Budget.
09-08-2009, 06:35 PM
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Re: Compressor Map
Your engine and max rpm are also not accounted for here. for 3.43PR, that is over 34.7 to 34.8psi of boost pressure. I don't think that's what you're trying to get here.
Give me a PM, with all your listed numbers, as well as your engine displacement (engine type would be best)
-Horsepower to the WHEELs that you're looking for,
-What purpose you're using the car for. (street/strip, circuit race, etc)
-Also let me know what flanging (T3 or T4 , or T4 Divided) and exhaust downpipe bolt pattern (4 bolt, V-band) etc.
-Do you want journal or ball-bearing cartridge, and do you know what is involved in each?
-Budget.
Give me a PM, with all your listed numbers, as well as your engine displacement (engine type would be best)
-Horsepower to the WHEELs that you're looking for,
-What purpose you're using the car for. (street/strip, circuit race, etc)
-Also let me know what flanging (T3 or T4 , or T4 Divided) and exhaust downpipe bolt pattern (4 bolt, V-band) etc.
-Do you want journal or ball-bearing cartridge, and do you know what is involved in each?
-Budget.
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