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2 Turbo's slight difference

I picked up my engine last night, and I found that I got not one, but 2 turbo's out of the deal, however the mount and oil line(?) for the new turbo is different from the one that came off of the car! What does this mean, and what can I do to use the new turbo in my car?


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Eric Devansky
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Old 10-18-2004, 02:02 PM
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Go to a hardware store and buy a plug that fits it. I assume the two holes are threaded....
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Old 10-18-2004, 02:29 PM
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The extra hole on the left turbo won't do jack. There's an O-ring around the fitting to control oil flow anyway so the oil won't get past the O-ring and into that "extra" hole anyway. I'd remove the plastic or it's going to ignite or melt though. Find a metal plug, if anything.

Is the one on the left a #8 hot side?
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Old 10-31-2004, 01:16 AM
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The extra hole on the left turbo won't do jack. There's an O-ring around the fitting to control oil flow anyway so the oil won't get past the O-ring and into that "extra" hole anyway. I'd remove the plastic or it's going to ignite or melt though. Find a metal plug, if anything.

Is the one on the left a #8 hot side?
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Old 10-31-2004, 01:23 AM
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A #8 hot side? I am prety new to the 951 thing, and I am still reading all I can. What do you mean?

~Eric
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Old 10-31-2004, 06:07 AM
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The standard k26 turbocharger uses what's called a "#6" hot side (has to do with the size of the turbine wheel). The later Turbo-S models used a #8 (slightly larger) hot side which trades spool-up speed for the ability to hold boost at higher RPM, consequently boosting the max. rated H.P. from 217 to 247, IIRC. A common mod for guys with 951s is to retrofit their k26/6 turbos with #8 hot sections, effectively making them k26/8 turbos and basically the same as a Turbo-S.
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Old 10-31-2004, 09:59 AM
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Here's a picture comparing the #6 and #8 turbine sides on the K26. Note that the outer housing is exactly the same size, it's the wheel on the inside that's larger:



And the resultant differences in their dyno-charts (both on APE chips):



There's a little more boost-lag as the K26/8 takes about 750rpms longer to hit its torque-peak, but from 3500rpm on, it has more torque than the K26/6.


Last edited by DannoXYZ; 11-07-2004 at 08:05 PM..
Old 11-07-2004, 07:27 PM
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