How to read compressor maps.
http://www.honda-tech.com/zerothread?id=142398
phew! lol i ddint wanna write up my own explanation when that guy does a great job. !!!!!!!READ THE WHOLE POST!!!!!!!!! |
Re:How to read compressor maps.
from http://www.team-integra.net/forum/di...&TopicID=42329
Originally posted by scarecrowX on May/14/03 the lines are the airflow demand lines for a B18B engine. add one line to the right for an idea of where the B18C would sit at 8K. the far left line represents 3000rpm, each line increasing in 1000rpm increments. to calculate boost pressure from the pressure ratio, take the (pressure ratio x 14.7) - 14.7. we'll start with the SMALLEST of the T4 compressors and work our way bigger: T04B's http://www.imagestation.com/picture/...a/fc26b8f6.jpg http://www.imagestation.com/picture/...e/fc26b8f7.jpg T04E's http://www.imagestation.com/picture/...4/fc26b8f2.jpg http://www.imagestation.com/picture/...0/fc26b8f0.jpg http://www.imagestation.com/picture/...8/fc26b8ef.jpg http://www.imagestation.com/picture/...3/fc26b8ee.jpg http://www.imagestation.com/picture/...8/fc26b8ed.jpg http://www.imagestation.com/picture/...3/fc26b8ec.jpg as you can see, about 50% of the engine's demand lies not only outside the compressor map, but beyond the surge limit for pretty much every single T04. |
Re:How to read compressor maps.
Originally posted by scarecrowX on May/14/03 now we'll look at the T3 turbos, starting with the smallest, the 40 trim: http://www.imagestation.com/picture/...c/fc26b8eb.jpg http://www.imagestation.com/picture/...1/fc26b8ea.jpg http://www.imagestation.com/picture/...f/fc26b8f4.jpg http://www.imagestation.com/picture/...4/fc26b8f1.jpg http://www.imagestation.com/picture/...4/fc26b8b7.jpg the demand lines are covered far better by the T3 series turbos than the T4's. compressor efficiency may be lower in some areas, but an efficient intercooler will more than compensate for slight variations in efficiency between them. anything bigger than a 50 trim looks to be good enough, even for the higher pressure ratios. |
Re:How to read compressor maps.
Originally posted by scarecrowX on May/14/03 last, but certainly not least, the mistubishi turbos. surprisingly, the Mitsubishi turbos look to be an ideal fit for the B18B engine. the TD04H-13G is the turbo found on most 1g dsm cars with automatic transmissions. http://www.imagestation.com/picture/...1/fc2570a6.jpg the coverage of demand lines is surprisingly good. the only downfall of this turbo is the undersized turbine which would tend to strangle the higher rpms.. porting could help, as could switching to a TD05 turbine. the TD04H-15G as found on some higher end volvo turbo cars http://www.imagestation.com/picture/...3/fc2570a2.jpg again, only the turbine housing is a drawback. the TD05H-14B turbo found on all 1st gen turbo dsm's with manual transmissions: http://www.imagestation.com/picture/...c/fc2570a0.jpg these turbos may be less suited to the GSR/type R engines as they rev higher. like i said in the first post, add another demand line to the right of 7000rpm to get an idea where 8000 rpm would fall on the map. |
Re:How to read compressor maps.
hijack my post i will rape u
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Re:How to read compressor maps.
Originally Posted by shortyz
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Re:How to read compressor maps.
Originally Posted by shortyz
hijack my post i will rape u
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Re:How to read compressor maps.
nice job with the compressor maps
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Re:How to read compressor maps.
i could have SWORN that i replied to this....and asked what the 14b map is telling me about them...
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Re:How to read compressor maps.
basically it means for a b18a/b it reaches max efficiency at about 8psi right around where we make max torque, yet still has some left for our redline. so its a great match. and even looks like it spools before 3k rpm?
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