differences in compressor trims??
#2
Rotorhead
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Location: Charlottesville, Virginia, USA
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Much like automobile names, there isn't a whole lot of meaning in compressor names. These links will show statistics on some of the more common aftermarket turbochargers:
http://www.turboneticsinc.com/index01.html
http://www.ihi-turbo.com/
http://www.majesticturbo.com/
http://www.egarrett.com/products/orig_equip.jsp
http://www.turboneticsinc.com/index01.html
http://www.ihi-turbo.com/
http://www.majesticturbo.com/
http://www.egarrett.com/products/orig_equip.jsp
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#9
I'm assuming you need more information on turbine trims.
There aren't many maps for turbines (any I can think about). Trimming the turbine wheel and having it flow more (theoretically) should enable more potential for your power band.
A/R ratio of the turbine section (or hot side) has a more direct and weighted affect on spool time. If you increase the efficiency of the turbine wheel (trimming it to flow more), then it should help the spool since the wheel should spin better. My guess is that the affect is minimal.
As for efficiency, you're still limited by your compressor.
J
There aren't many maps for turbines (any I can think about). Trimming the turbine wheel and having it flow more (theoretically) should enable more potential for your power band.
A/R ratio of the turbine section (or hot side) has a more direct and weighted affect on spool time. If you increase the efficiency of the turbine wheel (trimming it to flow more), then it should help the spool since the wheel should spin better. My guess is that the affect is minimal.
As for efficiency, you're still limited by your compressor.
J
#10
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We are asking about the LETTER trims such as p-trim, q-trim and so on. Everyone knows what a/r ratio does.
I think when you say trimming the turbine you mean clipping it, which actually DECREASES the efficiency, but increases the maximum flow.
I think when you say trimming the turbine you mean clipping it, which actually DECREASES the efficiency, but increases the maximum flow.
#11
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All things being equal a P-trim will spool quicker but have a little less top end than the Q.
Check out the new GT-Q and GT-R turbines.
HoustonT over at Supra forums has a dyno of identical runs (boost 27 psi, fuel 11.5, timing, etc.) with a 74 GT-Q and 74 GT-R (both .81 A/Rs)... the GT-R made 50 more rwhp with zero additional lag... amazing.
Here are the two dyno's overlayed...
Check out the new GT-Q and GT-R turbines.
HoustonT over at Supra forums has a dyno of identical runs (boost 27 psi, fuel 11.5, timing, etc.) with a 74 GT-Q and 74 GT-R (both .81 A/Rs)... the GT-R made 50 more rwhp with zero additional lag... amazing.
Here are the two dyno's overlayed...
#13
so judging by the graph, theoretically the P trim should have spooled quicker, but the Q achieved 50 additional horsepower. i know that there are 3 main trims that are in use: V, P, and Q. i know that Q trim flows more than P trim, which flows more than V trim. which will in turn make higher horsepower, and just the opposite for spool time, i'm guessing. my intention for this post was to find the best trim for a gt35/40. my goal is mainly a street car, with a few yearly trips to the drags. i'd like a quick spool with over 400 @ 15psi daily, and the ability to turn it up to 20psi on those "special occasions" i dont think i'll have a problem with the 35/40, .70 front, and 1.06 rear. but since i'm doing it, i like to get the best i can for my goal. thanks for the help.
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Jeff20B
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