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Question K26 turbos

Does anybody know where to get specs on K26 turbos from 930, 931, 951? Specs I'm interested in are AR ratios, compressor maps, etc.

Thanks,
drew1

Old 05-20-2001, 03:10 PM
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Do a search on the net...I found a place that actually has a map of a k26 and it is pretty depressing (no offense to you stock guys). I mean depressing in that compressor efficiency drops off pretty quickly when you go much above stock boost levels. This essentially means that you are heating a lot of air instead of actually compressing it.

I'll try to find the link...

Erick
Old 05-21-2001, 12:35 AM
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Thanks Erik. Got to go through wife's old 931 this summer. I was wondering if 944 guts would fit & give good effiency on the airflow needed for decent boost on the 2 liter motor.

drew1
Old 05-21-2001, 07:16 PM
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Here is a k26 compressor map that I found from an Audi. Its likely the same as the k26 on the 951.

Erick

Old 05-22-2001, 02:10 AM
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the audi turbo's got the k6/4 if i am not mistaken..so it is smaller and the flow would be diff...but your right it is not that far from the mappings......

i guess a garett hybrid would be best...T3/T4....T3 turbine and a T4 compressor...

this what i have learned/experience..i had tried a full... T4/60-1 with a P trim and can't get to spool( too big)...so i have down graded to a smaller trim(smaller turbine side but the same size compressor)....and it's not a joke fitting that turbocharger in......it not a direct bolt...a lot of things to be modified...
Old 05-22-2001, 06:36 AM
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That map is for a k26 compressor - just like a 951. It maybe from an Ur-Quattro, 5000, or A4 - I'm not sure. Remember that it is only a compressor map. In other words, no matter what size the exhaust housing/wheel are the compressor map will not change.
Old 05-22-2001, 02:23 PM
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Thanks Erik. Been searching and found same map on Audi board. By other posts on Audi board, It seems that Porsche had a different turbine or hot side on K26 which Audi considered an upgrade.

I wonder if there were different compressors used by Porsche on K26. Would you use the same compressor on a 3.0 flat six, 930, and a 2.0 truck motor, 931.

The Huntley Racing site gives a dyno sheet of stock K26 in 951 that shows a big torque drop about 4000 rpm. I think I have read on this board about about a boost drop in higher rpm in stock 951. One of these compressors for 2.0 bar pressure at 4000rpm in a 951, would probably give about 1.8 bar at 6000 in 2.0 liter 931 with the same flow & effiency.

drew1

Old 05-23-2001, 01:12 AM
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