Miata Turbo Forum - Boost cars, acquire cats.
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Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   DIY Turbo Discussion (https://www.miataturbo.net/diy-turbo-discussion-14/)
-   -   Quick Spool... long range Turbo? (https://www.miataturbo.net/diy-turbo-discussion-14/quick-spool-long-range-turbo-34678/)

Braineack 05-05-2009 12:01 PM
Colorado Human Resource Association

AlexandertheOk 05-05-2009 01:05 PM
Cawk Hawking Recreational Activities?

Saml01 05-05-2009 01:32 PM
Originally Posted by Savington (Post 404434)
.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 fuck 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.

Braineack 05-05-2009 02:15 PM
The compressor A/R means diddly squat.

like you said, go read.

I'll make it easy:
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.

ZX-Tex 05-05-2009 02:33 PM
Crack-like Horsepower Requiring Addicts.

Stein 05-05-2009 02:57 PM
I think my SR20T25 is an 80 but I don't remember. Spools 7 psi wastegate just before 3,000.

FRT_Fun 05-05-2009 03:05 PM
Canadian Human Rights Act

Savington 05-05-2009 03:18 PM
Originally Posted by Saml01 (Post 404623)
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.

Originally Posted by Braineack (Post 404637)
The compressor A/R means diddly squat.

like you said, go read.
thx 4 playin bro :hustler:

saitrix 05-05-2009 05:44 PM
Originally Posted by samnavy (Post 404446)
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.

Saml01 05-06-2009 12:10 AM
Originally Posted by Braineack (Post 404637)
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.

Tony~ 05-06-2009 12:36 AM
Seriously, Thanks for infos, its really usefull :)


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