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A/r Ration On Twin Divided Housings.

Old 02-21-2004, 01:28 PM
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Is there a special way to find the a/r ration for a twin divided housing?

I`ve got a KKK K27, the real one, not the one SR Motorsport is selling.

I tried to find the a/r ration on it, using the area of both the ex. ports divided by the distance from the turbine wheel center to the center of the ex. ports, but I`m only getting weird numbers..

If anyone would like to help me out, the measurement are as following:

2 ex. ports with 45mm x 28mm "holes" each, and 68mm between the turbine wheel center and the center/middle of the ex. ports.

Any help a is appreciated.

Here`s some pics of it.



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Old 02-21-2004, 01:35 PM
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The k27 next to the stock t2 turbo.
Attached Thumbnails A/r Ration On Twin Divided Housings.-k27_and__stock__turbo_1.jpg  
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Old 02-21-2004, 01:37 PM
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one more.
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Old 02-21-2004, 01:39 PM
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Last one.
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Old 02-21-2004, 01:52 PM
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Converting to square inches and inches before dividing gives you a much more resonable number. 1.46



It's only 68 mm from the shaft to the middle of the flange? It looks like more in the pictures.
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Old 02-21-2004, 03:03 PM
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Yeah I`m pretty sure it`s 68mm, but I`ll take a new measurement just in case. Here`s a pic of the exhaust side, showing the size a bit better.

It`s got a 76mm turbine wheel and 68mm outlet on the exhaust side,and a 87mm compressor wheel and 42mm outlet on the intake side.

How many hp do you think it will be good for?
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Old 02-21-2004, 05:22 PM
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Both of these lines would have to be 68mm then.
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Old 02-21-2004, 05:35 PM
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your K27 looks alot different than mine...



Anyways, what is the forumla you guys are useing?
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Old 02-22-2004, 09:30 AM
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How much and where did you get it?
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Old 02-22-2004, 03:34 PM
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Well, check ebay...



And I got mine for $200 shipped.
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