ct-26 exhaust- what is the A/R?
- Thread starter mjtoll23
- Start date
I forgot to copy the text, but it's all here.
http://www.supramania.com/forums/showthread.php?t=38804
HTH
http://www.supramania.com/forums/showthread.php?t=38804
HTH
LOL, sorry, I don't have the a/r for the stock CT26. What the hell, though, let me go measure it 
*Edit* DAMMIT I'M STUPID.
Would you believe I actually forgot that I traded my 57 trim for the PTE67 in the garage? I remembered 'Oh yeah, my turbo is on the shelf in the cabinet' open it up, and blink dumbfoundly at the snail in there.
:3d_frown:
If anyone wants, just measure the cross-sectional area of the inlet (not the flange, the actual turbine inlet), and divide by the radius from the center of the housing to the center of the cross-section.
*Edit* DAMMIT I'M STUPID.
Would you believe I actually forgot that I traded my 57 trim for the PTE67 in the garage? I remembered 'Oh yeah, my turbo is on the shelf in the cabinet' open it up, and blink dumbfoundly at the snail in there.
:3d_frown:
If anyone wants, just measure the cross-sectional area of the inlet (not the flange, the actual turbine inlet), and divide by the radius from the center of the housing to the center of the cross-section.
ill figure something out... i have a spare
edit; the cross-sectional area of the turbine inlet is 2827mm2, the distance of turbine inlet flange where i measured is 118mm.
when i divide 2827 by 118, its not a sensible solution. you sure thats how its done?
am i supposed to divide by 100 and subract from 1 or something?
edit; the cross-sectional area of the turbine inlet is 2827mm2, the distance of turbine inlet flange where i measured is 118mm.
when i divide 2827 by 118, its not a sensible solution. you sure thats how its done?
am i supposed to divide by 100 and subract from 1 or something?
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lmao... don't do it IN the flange itself - do it in the nozzle (use a small bore gauge)
*edit* I see where I was vague, my fault!
*edit* I see where I was vague, my fault!
a/r stands for area/radius.
you need the area of the exhaust inlet and then divide that by the distance between the center of the turbine outlet and the center of the exhaust housing. i believe the ct-26 sits int he high .4x section...
i think you messed up on your calculations.
i think its .47 but i could be horribly wrong on that. anyway...its tiny...even 3s guys ditch them for something else and they only displace 2L instead of 3L
you need the area of the exhaust inlet and then divide that by the distance between the center of the turbine outlet and the center of the exhaust housing. i believe the ct-26 sits int he high .4x section...
i think you messed up on your calculations.
i think its .47 but i could be horribly wrong on that. anyway...its tiny...even 3s guys ditch them for something else and they only displace 2L instead of 3L
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hellraiser456 said:a/r stands for area/radius.
you need the area of the exhaust inlet and then divide that by the distance between the center of the turbine outlet and the center of the exhaust housing. i believe the ct-26 sits int he high .4x section...
i think you messed up on your calculations.
i think its .47 but i could be horribly wrong on that. anyway...its tiny...even 3s guys ditch them for something else and they only displace 2L instead of 3L
Dammit, I hate my internet........... Read my next post....
Right idea, but wrong location in that picture.
The area is measures once in the scroll, no at the inlet... It is also measures in at the same location as where the radius is being measured or better stated as the cross section area is where the radius line is.
The area is measures once in the scroll, no at the inlet... It is also measures in at the same location as where the radius is being measured or better stated as the cross section area is where the radius line is.
You can measure from any part of the turbine housing up from the inlet. I'll snag pics tomorrow on my PTE67 to show you what I mean.
Doward said:
Yeah, but dont both measurements have to be taken from the same spot (i.e, the radius is from the center line of the turbo to the center point of where the cross section are was taken.)? If they were taken from different spots, thier ratio would be different.
the idea of it being a ratio dictates that the solution to the equation would be the Same no matter where you took the 2 measurements, as long as they were from the same section of the housing.
i figured the inlet would be the same result as if i had measured further in.
the reduction of cross sectional area is supposed to be directly proportional to the reduction of radius. the shorter the radius, the smaller the cross section and its supposed to be dependant on one another.
i do have inside bore guages, but i dont know where i put them...
Btw, Hellraiser, the 3sgte version of the CT26 uses a smaller exhaust housing than the 7M. the 3s guys "upgrade" to our turbos since our turbos support more power and have a larger hotside than theirs.
i figured the inlet would be the same result as if i had measured further in.
the reduction of cross sectional area is supposed to be directly proportional to the reduction of radius. the shorter the radius, the smaller the cross section and its supposed to be dependant on one another.
i do have inside bore guages, but i dont know where i put them...
Btw, Hellraiser, the 3sgte version of the CT26 uses a smaller exhaust housing than the 7M. the 3s guys "upgrade" to our turbos since our turbos support more power and have a larger hotside than theirs.
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