AF and AR of RCM Turbo and S206
20 October 2010, 01:46 PM
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AF and AR of RCM Turbo and S206
I would like to know, what AF (inlethousing) and what AR (exhaustside) the RCM GT35/P20 hybrid turbo and the S206 have got!
Many thanks for your answers in advance!
Greets
Markus
Many thanks for your answers in advance!
Greets
Markus
20 October 2010, 08:12 PM
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S206 has a .60 A/R inlet and a 0.64 exhaust side. How are you finding it ?
21 October 2010, 09:57 AM
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Yes I know, but what AR is the P20 housing?
@Martyn: The S206 outs a smile on my face every time I hit 4500rpm!
Simon did a great job mapping the car last week and not it´s a weapon on the street with the unleashed power of 2.05bar!
Btw. thanks for the information!
@Martyn: The S206 outs a smile on my face every time I hit 4500rpm!
Simon did a great job mapping the car last week and not it´s a weapon on the street with the unleashed power of 2.05bar!
Btw. thanks for the information!
21 October 2010, 10:53 AM
#5
Old info from the RCm site - I have one of these on my 2 litre
"In order to achieve higher levels of Bhp and torque which can’t be achieved through the standard OEM turbos, Roger Clark Motorsport have developed their own range of blue printed, direct replacement, Hybrid turbos. These have been designed specifically for the Impreza, releasing greater potential from your Subaru engine. Based on the Garret series of turbos, this versatile roller bearing unit features a central core from the GT30/35 incorporating their Ballistic ball bearing concept design, resulting in a low inertia unit with excellent spool characteristics. The re-profiled T4 (0.6AR) compressor cover incorporates a 76mm inlet with a ported shroud. This porting helps prevent turbo surge and increases air flow at the top end. Each turbo comes with its own pre set, up-rated actuator on a heavy duty welded on bracket. The modified P20 exhaust housing features a ported inlet and internal waste gate allowing a greater and freer flow of exhaust gases. This turbo is rated to run a maximum boost of 32 psi or 2.1 bar and will support up to 480Bhp"
"In order to achieve higher levels of Bhp and torque which can’t be achieved through the standard OEM turbos, Roger Clark Motorsport have developed their own range of blue printed, direct replacement, Hybrid turbos. These have been designed specifically for the Impreza, releasing greater potential from your Subaru engine. Based on the Garret series of turbos, this versatile roller bearing unit features a central core from the GT30/35 incorporating their Ballistic ball bearing concept design, resulting in a low inertia unit with excellent spool characteristics. The re-profiled T4 (0.6AR) compressor cover incorporates a 76mm inlet with a ported shroud. This porting helps prevent turbo surge and increases air flow at the top end. Each turbo comes with its own pre set, up-rated actuator on a heavy duty welded on bracket. The modified P20 exhaust housing features a ported inlet and internal waste gate allowing a greater and freer flow of exhaust gases. This turbo is rated to run a maximum boost of 32 psi or 2.1 bar and will support up to 480Bhp"
21 October 2010, 01:09 PM
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Seems as if I have found some information about it. VF22/23 use the P20 housing, so it should be 0.71 AR
Does this mean the S206 is smaller than the GT35/P20 hybrid?
I can´t believe as in terms of power I would rate the S206 over the GT35/P20...
Does this mean the S206 is smaller than the GT35/P20 hybrid?
I can´t believe as in terms of power I would rate the S206 over the GT35/P20...
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22 October 2010, 11:51 AM
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22 October 2010, 12:03 PM
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P20 relates to the AR measured in CM, rather than inches. Because A/R is an Area/Distance it is not dimensionless, so 20cm A/R is 0.787 Inches.
However it is just a ratio, and you can still have a big turbine housing with a low A/R that will be massively bigger than a very small housing with a big A/R. So a garrety GT30 0.63 A/R housing is bigger than a Garrett GT25 0.76 A/R housing.
The upshot of all this is you can't directly compare A/R numbers across different styles of turbos.
However it is just a ratio, and you can still have a big turbine housing with a low A/R that will be massively bigger than a very small housing with a big A/R. So a garrety GT30 0.63 A/R housing is bigger than a Garrett GT25 0.76 A/R housing.
The upshot of all this is you can't directly compare A/R numbers across different styles of turbos.
22 October 2010, 01:53 PM
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The upshot of all this is you can't directly compare A/R numbers across different styles of turbos.
Would really love to know about the RCM turbo!
22 October 2010, 07:31 PM
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22 October 2010, 08:04 PM
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I had the old RCM GT35/P20 hybrid on my car and now the S206, but my mechanic has the RCM now on his 2.5l and wanted to know about the AR of the exhaust, as the APS SR55 he had before, seemed to be much bigger on the exhaust side...
And I wanted to know, if the S206 was really a step forward.
I feel that the S206 is more powerful, but maybe that´s because Simon mapped it perfectly now and not me trying to be safe and get power out the same time!
And I wanted to know, if the S206 was really a step forward.
I feel that the S206 is more powerful, but maybe that´s because Simon mapped it perfectly now and not me trying to be safe and get power out the same time!
23 October 2010, 09:14 PM
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Will ask them by email next week.
My mechanic tried the GT35/P20 hybrid on his car with 2.5"exhaustsystem and had seen, that the the turbo does not offer a topend as good as the SR55 before, he even had to retard timing a bit, so the engine does not knock.
The midrange is better on the RCM turbo, but on top he drove the SR55 even with less boost and it pulled a bit better than the RCM...
I always thought the APS turbos do not produve the promissed power, but he also said that the exhausthousing seems to be a bit bigger, than the RCm one.
My mechanic tried the GT35/P20 hybrid on his car with 2.5"exhaustsystem and had seen, that the the turbo does not offer a topend as good as the SR55 before, he even had to retard timing a bit, so the engine does not knock.
The midrange is better on the RCM turbo, but on top he drove the SR55 even with less boost and it pulled a bit better than the RCM...
I always thought the APS turbos do not produve the promissed power, but he also said that the exhausthousing seems to be a bit bigger, than the RCm one.
24 October 2010, 10:15 AM
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My own car ran an 11.1 at 453bhp and 420lbft with a full interior.
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