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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 05-05-2009, 01:01 PM   #21
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Old 05-05-2009, 02:05 PM   #22
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**** Hawking Recreational Activities?
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Old 05-05-2009, 02:32 PM   #23
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Quote:
Originally Posted by Savington View Post
.80 A/R is compressor. Compressor A/R doesn't mean anything. You have an 80/64 T25, which is perfect. Good luck on the build. (Get your CHRA orientation right and don't **** up your tune.)
WTF do you mean it doesnt mean anything. It means plenty. Go read. It may not be the most important spec on a turbo, but its damn useful.
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Old 05-05-2009, 03:15 PM   #24
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The compressor A/R means diddly squat.

like you said, go read.

I'll make it easy:
Quote:
Originally Posted by Turbo Tech 102
Compressor A/R - Compressor performance is comparatively insensitive to changes in A/R. Larger A/R housings are sometimes used to optimize performance of low boost applications, and smaller A/R are used for high boost applications. However, as this influence of A/R on compressor performance is minor, there are not A/R options available for compressor housings.
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Old 05-05-2009, 03:33 PM   #25
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Crack-like Horsepower Requiring Addicts.
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Old 05-05-2009, 03:57 PM   #26
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I think my SR20T25 is an 80 but I don't remember. Spools 7 psi wastegate just before 3,000.
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Old 05-05-2009, 04:05 PM   #27
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Old 05-05-2009, 04:18 PM   #28
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Quote:
Originally Posted by Saml01 View Post
WTF do you mean it doesnt mean anything. It means plenty. Go read. It may not be the most important spec on a turbo, but its damn useful.

Quote:
Originally Posted by Braineack View Post
The compressor A/R means diddly squat.

like you said, go read.
thx 4 playin bro
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Old 05-05-2009, 06:44 PM   #29
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Quote:
Originally Posted by samnavy View Post
That turbo on a 1.6 with a Bell S4 manifold, decent ECU, and any 2.5" exhaust will probably make in the 220-230whp range at 15psi. You'll make 2-3psi by 2k rpm and be fully spooled in the 3200-3500range.

If you're sticking with bandaids, it'll still probably make a tick over 200whp at 15psi and spool the same.

CHRA (just google it dude)
Useful info. I have a 1.8 but still handy to see that sort of thing, especially when I am also only aiming for 200whp.
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Old 05-06-2009, 01:10 AM   #30
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Quote:
Originally Posted by Braineack View Post
The compressor A/R means diddly squat.

like you said, go read.

I'll make it easy:
That says nothing about it not meaning anything. Just not as important on compressor housings as it is on turbine housings.

A/R lets you easily compare the performance of two turbos with identical wheels but different housings.

In the case of the t25 80/64 or its smaller counterpart its pretty valid since the wheels are the same but the housings are different.
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Old 05-06-2009, 01:36 AM   #31
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Seriously, Thanks for infos, its really usefull
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