A/R... semi explained

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03-28-2002, 04:49 PM

Dee

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A/R... semi explained

I just found a pic to help my explanation.

Compressor A/R is determined by dividing the radius of the compressor housing by the smallest diameter of the compressor outlet . Exhaust housing A/R is determined by dividing the radius of the exhaust by the smallest diameter of the exhaust inlet . As the A/R numerically increases so does the housings ability to induce/exduce a specific volume of air. Lag and effective power range will also be affected by A/R changes. Look at the A/R pic below.

Pic was ganked from a post on RX-7 Forum.

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03-28-2002, 07:14 PM

98civicEX

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Re: A/R... semi explained (Dee)

good info, thanks

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03-29-2002, 03:32 PM

Dee

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Re: A/R... semi explained (98civicEX)

No problemo! I figured a couple people would want to see this.

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01-12-2003, 12:58 AM

shortyz

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Re: A/R... semi explained (Dee)

does this work for the hot side also?

because the hot side A keeps getting smaller the farther u go into the turbo!!

hhhah

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01-12-2003, 01:05 AM

Arturbo

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Re: A/R... semi explained (shortyz)

I dont care about A/R, where the hell have you been?

art

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01-12-2003, 02:18 AM

BudaKai

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Re: A/R... semi explained (Arturbo)

A/R only matters when your turbo doesn't spool up quick enough and you need to change your housing, but that's why you buy the biggest one and a ball bearing center.

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01-12-2003, 05:11 AM

rjardy

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Re: A/R... semi explained (tzsir)

Quote:

A/R only matters when your turbo doesn't spool up quick enough and you need to change your housing, but that's why you buy the biggest one and a ball bearing center.

yeah, just throw all factual turbo charger selection theories out the window.........

geeez

Rob

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01-12-2003, 05:39 AM

C-Murdock

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Re: A/R... semi explained (rjardy)

Very informative post. Thank you !

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01-12-2003, 04:44 PM

Dee

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Re: A/R... semi explained (C-Redrum)

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01-12-2003, 08:53 PM

#10

SiRkid

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Re: A/R... semi explained (tzsir)

Quote:

A/R only matters when your turbo doesn't spool up quick enough and you need to change your housing, but that's why you buy the biggest one and a ball bearing center.

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01-12-2003, 08:54 PM

#11

Daniel

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Re: A/R... semi explained (98civicEX)

Quote:

good info, thanks

[Modified by Daniel, 5:55 AM 1/13/2003]

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01-12-2003, 09:08 PM

#12

98civicEX

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Re: A/R... semi explained (Daniel)

10 month old post...where the hell this come from? lol...

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01-12-2003, 09:22 PM

#13

AB16A2T

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Re: A/R... semi explained (98civicEX)

Ask Shortyz

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01-12-2003, 10:20 PM

#14

shortyz

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Re: A/R... semi explained (AresB18C1Turbo)

i use the search button.
i think
o wait no i think i got this off that other post..
who the hell knows.
its great info though.

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01-13-2003, 07:45 AM

#15

legendboy

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Re: A/R... semi explained (shortyz)

Quote:

Great info!

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01-14-2003, 07:32 PM

#16

Dee

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Re: A/R... semi explained (legendboy)

wow.. somebody actually uses the search engine

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01-14-2003, 08:34 PM

#17

PeakBoost

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Re: A/R... semi explained (legendboy)

Quote:

that is the compressor wheel formula

flip that to determine turbine wheel trim

[(exducer)(exducer)/(inducer)(inducer)]x100 = turbine wheel trim

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01-14-2003, 08:56 PM

#18

shortyz

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Re: A/R... semi explained (CHEAPTURBOdotCOM)

[(exducer)(exducer)/(inducer)(inducer)]x100 = turbine wheel trim
???
i am confused on what u guys mean by minor wheel diameter and such..
u mean from small fin to small fin and big fin to big fin?

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01-14-2003, 09:08 PM

#19

vtec.dc2

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Re: A/R... semi explained (CHEAPTURBOdotCOM)

it works.. and looks like i chose the right turbine side - i wish i had this formula - woudld't have to guess all this time..

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01-14-2003, 09:13 PM

#20

vtec.dc2

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Re: A/R... semi explained (CHEAPTURBOdotCOM)

i might be wrong.. but i think its the other way around

Quote:

formula for determining trim
[(minor wheel diameter)x(minor wheel diameter) / (major wheel diameter)x (major wheel diameter) ] x 100= trim

T04E 60
[(2.290)(2.290)/(2.950)(2.950)] x 100= trim
(5.2441/8.7025) x 100= trim
.6026 x 100 = trim
60= trim

Great info!

that is the compressor wheel formula

flip that to determine turbine wheel trim

[(exducer)(exducer)/(inducer)(inducer)]x100 = turbine wheel trim

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01-14-2003, 09:16 PM

#21

vtec.dc2

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Re: A/R... semi explained (shortyz)

example:

http://64.225.76.178/catalog/comp_wheels.html - compressor sides
http://64.225.76.178/catalog/twheel.html - turbine side
http://64.225.76.178/catalog/thousing.html - turbine side

heres my turbocharger - T3/T04B S:

Specs for compressor: 1.904" - inducer, 2.750" - exducer - it says major but i guess its the same thing

(1.904 x 1.904) / (2.750 x 2.750) / 100 = 47.93 for turbine size which is i went with, but wish i had this formula at the time..

Quote:

[(exducer)(exducer)/(inducer)(inducer)]x100 = turbine wheel trim
???
i am confused on what u guys mean by minor wheel diameter and such..
u mean from small fin to small fin and big fin to big fin?

[Modified by vtec.dc2, 1:16 AM 1/15/2003]

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01-14-2003, 10:52 PM

#22

SIXTYdashONE

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Re: A/R... semi explained (vtec.dc2)

informative post, and this is an old aZZ thread!

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01-15-2003, 03:27 AM

#23

Dee

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Re: A/R... semi explained (SIXTYdashONE)

I am always posting crap like this since Geoshities killed my site

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01-16-2003, 09:43 AM

#24

BudaKai

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Re: A/R... semi explained (SiRkid)

I guess humor is't a good part of my personality. Sorry I was atempting to make a joke noticed the sarcastic

Quote:

A/R only matters when your turbo doesn't spool up quick enough and you need to change your housing, but that's why you buy the biggest one and a ball bearing center.

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