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Sy/Ty 8cm turbine Housing AR


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#1 SSG_CARTER

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Posted 30 December 2018 - 02:24 PM

This has been said somewhere on the boards and Iím not able to pin it down.
What is the AR for the Sy/Ty 8cm turbine housing? Itís larger than the standard starquest, but whatís it closer to? The .57 or .63 or?





#2 scott87star

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Posted 30 December 2018 - 02:55 PM

Quote

Boosted_One
Turbine sizing - CM2 to A/R

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

This is just a rough guide. It would depend which housing you have, the nozzle area size and other variables. So it isn't exactly cut and dry...there's a few variables there that throw a direct comparison out the window.


Good example is the 06-17C Ty/Sy turbo..it has the same 8cm2 housing as our Conquest/Starion but has a larger turbine inlet and outlet so it will flow better than the same 8cm2 05 housing.

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#3 SSG_CARTER

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Posted 30 December 2018 - 03:22 PM

I read that. My question? Is closer to .63? Or? Because I am trying to get an idea if I should go to the 10cm or stay 8cm on the sy/ty housing for better overall performance.

#4 scott87star

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Posted 31 December 2018 - 11:38 AM

I believe the cm2 is A/R in the MHI turbos, so the Sy/Ty is still 0.57 but it does have a bigger turbine hence more flow.  Kind of like taking the stock 05 hotside and machining it for an 06 wheel.  You get more flow but it's still not an 06 hotside in A/R.

Borg Warner matchbot shows turbine flow now, about damn time as it dictates the ultimate HP, not the compressor map.  You can see the limit of each size turbine and even the changes from using larger or smaller turbine wheels.  For instance if you want to make 500 HP at 6000 rpm you need to flow about 55 lb/min air at 6000 rpm which requires a 74 mm wheel in a 0.92 A/R housing or a 70 mm wheel in a 1.22 A/R housing.  Looking at the graph you can see how the flow rises quickly and then levels off, the turbine just can't flow any more.

http://www.turbos.bw...t6_wrsin=92044
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ECU Vendor link:  http://www.starquest...howtopic=137426

#5 SSG_CARTER

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Posted 31 December 2018 - 03:02 PM

Thank you Scott87star. that is a great link explains alot. i appreciate all your input as usual. have a Happy New Year.




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