Help with A/R vs cm sq. housings

R

RyanU

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Feb 23, 2008
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7
Im tryin to figure out what the A/R would be on a holset 60 with a T4 flange and 3.4 exducer and a 22cm housing. Anyone have any idea?
 
Im not sure but I know a 22cm is pretty dang big. Here is a formula that I found on another forum. Not for sure if it is correct though.

((CM x 8) - 7)/100 = A/R ratio

According to that, a 22cm would be equivalent to a 1.69 which is waaay big. Especially on an automatic.
 
Here ya go......your math was correct Josh.....

6 cm2 = 0.41 A/R
7 cm2 = 0.49 A/R
8 cm2 = 0.57 A/R
9 cm2 = 0.65 A/R
10 cm2 = 0.73 A/R
11 cm2 = 0.81 A/R
12 cm2 = 0.89 A/R
13 cm2 = 0.97 A/R
14 cm2 = 1.05 A/R
15 cm2 = 1.13 A/R
16 cm2 = 1.21 A/R
17 cm2 = 1.29 A/R
18 cm2 = 1.37 A/R
19 cm2 = 1.45 A/R
20 cm2 = 1.53 A/R
21 cm2 = 1.61 A/R
22 cm2 = 1.69 A/R
23 cm2 = 1.77 A/R
24 cm2 = 1.85 A/R
25 cm2 = 1.93 A/R
 
I dont believe that is right, I think it is specific to frame size.

Off the top of my head, the 32cm housings for the HC5/HX82s have 1.63, or something in that range stamped on them.

According to the formula above, it should be a 2.49A/R.
 
LOGANSTANFORTH said:
Here ya go......your math was correct Josh.....

6 cm2 = 0.41 A/R
7 cm2 = 0.49 A/R
8 cm2 = 0.57 A/R
9 cm2 = 0.65 A/R
10 cm2 = 0.73 A/R
11 cm2 = 0.81 A/R
12 cm2 = 0.89 A/R
13 cm2 = 0.97 A/R
14 cm2 = 1.05 A/R
15 cm2 = 1.13 A/R
16 cm2 = 1.21 A/R
17 cm2 = 1.29 A/R
18 cm2 = 1.37 A/R
19 cm2 = 1.45 A/R
20 cm2 = 1.53 A/R
21 cm2 = 1.61 A/R
22 cm2 = 1.69 A/R
23 cm2 = 1.77 A/R
24 cm2 = 1.85 A/R
25 cm2 = 1.93 A/R
Click to expand...


That dosent look right.
 
i didnt say it was correct for what we was talking about, just that the math was correct for his calculations......
 
SmokinCAT said:
I dont believe that is right, I think it is specific to frame size.

Off the top of my head, the 32cm housings for the HC5/HX82s have 1.63, or something in that range stamped on them.

According to the formula above, it should be a 2.49A/R.
Click to expand...

I'm with you SmokinCAT! Personally I think A/R is probably the more accurate way to rate turbine housing size, cm2 is a displacement number that has too many variables due to turbine size...just my$.02 However I do prefer talking cm#s when comparing turbos.
 
SmokinCAT said:
I dont believe that is right, I think it is specific to frame size.
Click to expand...

Yep.

compressor_housing_showing_A-R_characteristic.gif
 
LReiff said:
I'm with you SmokinCAT! Personally I think A/R is probably the more accurate way to rate turbine housing size, cm2 is a displacement number that has too many variables due to turbine size...just my$.02 However I do prefer talking cm#s when comparing turbos.
Click to expand...


CM^2 is actually a crossectional area dimension.

The formula doesn't appear right.
 
I run a 16 cm T4 with the center cut out of the manifold and it lights around 2k or less with 29 timing no way its over 1.0 more like 85

Ryan I have 19gated housing off a HT60 I think u can light , but my gosh U have to cut the firewall, its big
 
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