turbo.. A/R what does it mean ?
18-09-2006, 07:05 PM
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turbo.. A/R what does it mean ?
hello just trying to find out what A/R on the housing means, as in say a t3 stage 3 Compressor A/R .42 Turbine A/R .48
my own turbo has a A/R of.70
thanks
andy
my own turbo has a A/R of.70
thanks
andy
18-09-2006, 07:08 PM
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a....cross sectional area of scroll "tube"
r.....distance from the center of the "tube" to the turbine shaft
think of it this way,....
a cossie ex housing is a/r .48.....this will effectively FIT more gas in the housing, than say an rst ex housing that is .36
from what you have put, the a/r of your current turbo is bigger....
carl
r.....distance from the center of the "tube" to the turbine shaft
think of it this way,....
a cossie ex housing is a/r .48.....this will effectively FIT more gas in the housing, than say an rst ex housing that is .36
from what you have put, the a/r of your current turbo is bigger....
carl
18-09-2006, 07:14 PM
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Originally Posted by Carlsworth
a....cross sectional area of scroll "tube"
r.....distance from the center of the "tube" to the turbine shaft
think of it this way,....
a cossie ex housing is a/r .48.....this will effectively FIT more gas in the housing, than say an rst ex housing that is .36
from what you have put, the a/r of your current turbo is bigger....
carl
r.....distance from the center of the "tube" to the turbine shaft
think of it this way,....
a cossie ex housing is a/r .48.....this will effectively FIT more gas in the housing, than say an rst ex housing that is .36
from what you have put, the a/r of your current turbo is bigger....
carl
its a evo turbo.. EVO 3 16G Ported Turbo/DSM BIG 16G EVO 3 MITSUBISHI TURBO..
im hardly usin any boost just 5/7 psi and its just awsome
andy
18-09-2006, 07:22 PM
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which side is the 70 a/r....
the bigger the a/r on the compressor side, will increase the speed at which the air will pass through....
and bigger on the ex side, will give more lag....
the secret is getting both right, otherwise there chance of spike, over un and other not nice suff.....lol
stu gave an impressive essay on this a few weeks back
carl,...
the bigger the a/r on the compressor side, will increase the speed at which the air will pass through....
and bigger on the ex side, will give more lag....
the secret is getting both right, otherwise there chance of spike, over un and other not nice suff.....lol
stu gave an impressive essay on this a few weeks back
carl,...
18-09-2006, 07:42 PM
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thanks carl 
thay said it will easly handle 380 bhp as i posted b4 im used to t3,s and cant get ma head round the fact that thers just no turbo lag with the evo, im just bedin it in for now then turn the boost up to standard around a bar
andy
thay said it will easly handle 380 bhp as i posted b4 im used to t3,s and cant get ma head round the fact that thers just no turbo lag with the evo, im just bedin it in for now then turn the boost up to standard around a bar andy
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18-09-2006, 07:55 PM
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Originally Posted by morto
thanks carl thay said it will easly handle 380 bhp as i posted b4 im used to t3,s and cant get ma head round the fact that thers just no turbo lag with the evo, im just bedin it in for now then turn the boost up to standard around a bar
andy
thay said it will easly handle 380 bhp as i posted b4 im used to t3,s and cant get ma head round the fact that thers just no turbo lag with the evo, im just bedin it in for now then turn the boost up to standard around a bar andy
no lag at 5-7 psi,.....whole different ball game at 15 psi....
18-09-2006, 08:06 PM
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carl there was hardly any lag on the standard turbo b4 this and this one is not for off standard, its ported but was ported at the factory and not by a turbo shop, its got a increased waste gate to help stop boost creep
andy
andy
18-09-2006, 08:59 PM
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Sorry yo hijack the thread but what does anyone make of this??
60 trim 60 mm BCI-1 compressor in standard T-3 housing. 79 trim 53.8mm Inco T-250 turbine wheel .86 A/R turbine housing.
60 trim 60 mm BCI-1 compressor in standard T-3 housing. 79 trim 53.8mm Inco T-250 turbine wheel .86 A/R turbine housing.
18-09-2006, 09:26 PM
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.86 ex housing seems excessive...
considering its only 60 trim comp side....
also, it wont be a standard "t3"
the compressor housing will need to be adequate size to take larger wheel...
will need to be 4x4 cossie size
carl
considering its only 60 trim comp side....
also, it wont be a standard "t3"
the compressor housing will need to be adequate size to take larger wheel...
will need to be 4x4 cossie size
carl
19-09-2006, 05:46 PM
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Originally Posted by Carlsworth
.86 ex housing seems excessive...
considering its only 60 trim comp side....
carl
considering its only 60 trim comp side....
carl
21-09-2006, 05:56 PM
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Originally Posted by Avinitlarge
Originally Posted by Carlsworth
.86 ex housing seems excessive...
considering its only 60 trim comp side....
carl
considering its only 60 trim comp side....
carl
well, look at cossies....
55, 2wd
60 4wd
yet the housings are .48.....
so your comp wheel is 60, and the ex housing is almost twice the size of a cossie one....
will cause huge amount of lag.....
carl
01-10-2006, 10:44 AM
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Originally Posted by Avinitlarge
The Lag isnt that bad to be honest, at 3K its boosting
i meant in relation to a .48 ex housing,..
you would be very surprised if you changed to .48...
also, im sure it starts boosting at 3k, but i bet its not full boost, and prob doesnt reach full boost till 4.5k ish....????
carl
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