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All the KKK / K26 info you ever wanted to know
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-nick  



Joined: 16 Nov 2002
Posts: 2700
Location: Cambridge, MA

PostPosted: Fri Jun 03, 2005 11:11 am    Post subject: All the KKK / K26 info you ever wanted to know Reply with quote

A collection of my notes, now you finally know what all the numbers mean. Enjoy!

K26 #6 turbine wheel - 48mm minor diam, 54mm major diam

#6 turbine housing minor bore = 48mm
#8 turbine housing minor bore = 55mm

Four numbers trailing the "K26" =
example, '79 RoW 931 K26-2470
"24" = 2.4" diameter for the compressor exducer (61mm)
"70" = compressor inducer is 70% the diameter of the exducer (42.7mm)

"R" - still unsure about this...
"6.10" refers to the turbine wheel, there's no rhyme or reason with KKK's numbering system here. For example a 5.10 could be larger than a 6.10 which could be larger than a 4.10. Stupid engineers...

The KKK part numbers have a little code too-
for example: 5326 970 7007
53 (?)
26 (compressor exducer)
970 (?)
70 (compressor inducer percentage of exducer)
07 (the last two digits look like version numbers)

----------------------------------------------------------------
931 Turbos:

79 M31.01 RoW
K26-2470 R 6.10
KKK p/n 5326 970 7007
compressor exducer= 61mm
compressor inducer= 42.7mm
trim= 49
compressor map: http://not2fast.wryday.com/turbo/maps/k26_map2.jpg

----
80 M31.02 US
K26-2664 G 4.10
KKK p/n 5326 970 6401 series I
6403 - Audi 200T '79 2.1L
6404 series II
6406 series III
6407 "
watercooled: 6411 - Audi 200T-III '84 2.22L
6413 - Audi 200T '81 2.1L
6415 - Audi 200T-II '82 2.22L
6416 - Audi 200,Ur-q 1/'83 2.1L
compressor exducer= 66mm
compressor inducer= 42.24mm
trim= 41
More info on the 6407:
Turbine housing p/n: 5326 101 6365
housing-exhaust diameters (reasonably accurate):
outermost 2 7/8"
inner 2 3/8"
innermost 2 7/32"

man-housing diameters:
outermost 2 1/16"
inner 1 21/32"
innermost 1 17/32"


----
81- M31.03 RoW

----
81-82 M31.04 US
K26-2660 GA 4.10
KKK p/n 5326 970 6020
6022
compressor exducer= 66mm
compressor inducer= 39.6mm
trim= 36

----
Carrera GT (M31.50)
K26-2660 GA 6.10
KKK p/n
Compressor cover part number 5326-100-5104
Compressor wheel 5326-123-2017
Turbine housing 5326-100-6328
compressor exducer= 66mm
compressor inducer= 39.6mm
trim= 36

----
924 Carrera GTS (GTR?)
Compressor cover part number 5326-100-5105
Compressor wheel 5326-123-2019
Turbine housing 5326-100-6330

---------------------------------------------------------------------
*Audi K26's below, "loose efficiency above 15psi, at 18psi they become
a heat pump" - from turbo builder
18psi ~ top of 70% efficiency range on maps

----
84-85 Audi 5000T "KH" engine
K26-2664 GA 6.91
Exhaust outlet diameter: 1.95"
KKK p/n 5326 970 6412
compressor exducer= 66mm
compressor inducer= 42.24mm
trim= 41
compressor map: http://not2fast.wryday.com/turbo/maps/k26_map.jpg
*from map- quicker spool than 6.95, not as efficient at higher boost
*also- spools later than 931 map, build more boost

----
86-88 Audi 5000T/TQ / 200T/TQ "MC" engine (5cyl, 10v)
K26-2664 GA 6.95
Exhaust outlet diameter: 2.20"
KKK p/n 5326 970 6411
compressor exducer= 66mm
compressor inducer= 42.24mm
trim= 41
compressor map: http://www.sjmautotechnik.com/parts_products/turbo/k26.html
"12-14psi is max on this turbo, anything more and intake temps rise
too much"

---------------------------------------------------------------------------
K26/6 turbo specs from 951.

Compressor housing :
ID intake 1-13/16"
OD intake 2"
OD outlet 2"

Compressor wheel :
Inducer dim. 1-3/4" (44mm)
Major dim : 2-9/16" (64mm)
= 46.63 trim

Turbine housing :
Inlet ID 1-15/16"
Outler ID 1-7/8"
6cm2 = 0.366 cu in A/R .? but in not sure about this. It seem pretty small.

Turbine wheel :
Exducer dim 2-7/16" ( 54mm)
Major dim. 1-7/8" (48mm)
= 59.17 trim


Last edited by -nick on Sun Nov 12, 2006 3:45 am; edited 3 times in total
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-nick  



Joined: 16 Nov 2002
Posts: 2700
Location: Cambridge, MA

PostPosted: Fri Jun 03, 2005 11:13 am    Post subject: Reply with quote

But wait, there's more...

Some general turbo info:

------------------------------------------------------------
Trim = (minor diameter^2 / major diameter^2) * 100

inducer - small diameter of the compressor wheel
exducer - large diameter of the compressor wheel

large inducer: more flow, more lag, surging concern

large exducer: less lag


large turbine: less flow restriction / less backpressure (more top end power), more lag

low A/R: more restrictive, less lag
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-nick  



Joined: 16 Nov 2002
Posts: 2700
Location: Cambridge, MA

PostPosted: Fri Jun 03, 2005 11:17 am    Post subject: Reply with quote

I can't stand it, what does it all mean?!

Well, among other things any K26 bearing housing with swap out, so we can easily upgrade to water-cooled housings from a 951 or Audi.

Also, there is a huge variety of compressor wheels available to us (though you have to change the housing to match).

If you want to change to a k26/8 hotside, all you need to do is bore out the exhaust housing and swap turbine wheels.

Cool, eh?

nick
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macBdog  



Joined: 16 Aug 2004
Posts: 1094
Location: Brisbane, Australia

PostPosted: Fri Jun 03, 2005 2:07 pm    Post subject: Reply with quote

Great info, thanks Nick.
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numbbers  



Joined: 05 Nov 2002
Posts: 1910
Location: Highlands Ranch, Colorado

PostPosted: Sat Jun 04, 2005 9:51 am    Post subject: Reply with quote

Good stuff, but I have two 6407s, and I can't figure out if they are series 1,2 or 3. I have different publications that list the 6407 as either a series one or a series three.
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-nick  



Joined: 16 Nov 2002
Posts: 2700
Location: Cambridge, MA

PostPosted: Tue Jun 14, 2005 12:31 pm    Post subject: Reply with quote

Hey folks,
A little more info- I picked up an early Audi oil cooled turbo. It's a 5326 970 6412. The important numbers are the "26" and "64" (compressor diameters). The compressor wheel is the same as the '80 and earlier US turbos. The bearing housing is angled slightly and won't mount up to our stock mount. The hot side housing uses a much smaller turbine wheel and outlet diameter while the inlet diameter is much larger than ours. Interesting.

Anyway, I'm going to be using the compressor wheel and cold housing from the Audi- just to make the plumbing easier for the IC.

nick
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Raceboy  



Joined: 01 Mar 2004
Posts: 2240
Location: Estonia, Europe

PostPosted: Tue Jun 14, 2005 3:31 pm    Post subject: Reply with quote

nick, is the turbine housing of that turbo in good shape? No cracks or anything? If it's so, I would be interested in that turbine housing.... I have this kind of rebuilt K26 (early Audi), but turbine housing is cracked (a lot). can you tell me the exact turbine wheel diam?
_________________
'83 924 2.5 16v Turbo, 470hp
'82 924S/931 "Gulf" racecar, 330 hp
'67 911 Irish Green hotrod, 2.4S
'78 911 SC 2.5 ss Turbo "Martini"
'84 924, turbocharged, sold.
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-nick  



Joined: 16 Nov 2002
Posts: 2700
Location: Cambridge, MA

PostPosted: Wed Jun 15, 2005 1:11 am    Post subject: Reply with quote

I haven't taken off the housing yet, but it looks pretty decent on the outside. Exit diameter = 50mm on the Audi, about 56mm for the 931 (on the innermost diameter). I assume you'll need the turbine wheel too?

I wouldn't mind trading you for a bottle of Estonia's finest vodka- I know you guys hoard some good stuff

nick
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Raceboy  



Joined: 01 Mar 2004
Posts: 2240
Location: Estonia, Europe

PostPosted: Wed Jun 15, 2005 2:26 am    Post subject: Reply with quote

No, I don't need turbine wheel, it's there and in decent shape.
And I don't mind trading it with some liquid stuff
_________________
'83 924 2.5 16v Turbo, 470hp
'82 924S/931 "Gulf" racecar, 330 hp
'67 911 Irish Green hotrod, 2.4S
'78 911 SC 2.5 ss Turbo "Martini"
'84 924, turbocharged, sold.
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Pär Hylander  



Joined: 22 Aug 2006
Posts: 7
Location: Sweden

PostPosted: Sun Nov 12, 2006 1:17 am    Post subject: Reply with quote

Carrera GTS (?)
K26-2670GA8-10
85 616 0363
5326 970 7008

Compressor cover cast: 2693 "diameter" 13 1 & 2691 "diameter" 18,3 9
Compressor wheel ?
Turbine housing 5326-101-6364
turbine 54.5mm
turbine >59 mm (impossible to measure due to foreign objects passed turbine, hole in housing 65.5 mm)
compressor exducer= 66 mm
compressor inducer= 46 mm
trim?
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462avi  



Joined: 15 Sep 2006
Posts: 149
Location: Hollister, California

PostPosted: Fri Dec 15, 2006 1:36 pm    Post subject: 924 cgt turbo Reply with quote

Nick

I sent you a pm about this. I just want to thank you again for hooking me up with Anthony. Now who wants to see a brand new never installed 924 Carrera GT turbocharger?


]



Thanks again
Geoff

P.S. I will try to post the p/n's from all the pieces on this thread
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Paul  



Joined: 02 Nov 2002
Posts: 9217
Location: Southeast Wisconsin

PostPosted: Fri Dec 15, 2006 1:57 pm    Post subject: Reply with quote

Why does it have "Seattle" on the tag?
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462avi  



Joined: 15 Sep 2006
Posts: 149
Location: Hollister, California

PostPosted: Fri Dec 15, 2006 2:28 pm    Post subject: Reply with quote

I had the same question. The story I got was that they are a distributor for KKK. The p/n's jive with what nick has posted here. There are no tool marks on the unit anywhere. So it is either brand new or freshly rebuilt but for $400.00 dollars U.S. who's arguing

Cold side housing p/n: 5326 101 5190 f
hot side housing p/n: 5326 101 6366


Geoff
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2002 grand cherokee with 4.7L
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Paul  



Joined: 02 Nov 2002
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PostPosted: Fri Dec 15, 2006 2:58 pm    Post subject: Reply with quote

Did you buy one or both of them from Tony, I almost bought both of them last Thursday....
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
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462avi  



Joined: 15 Sep 2006
Posts: 149
Location: Hollister, California

PostPosted: Fri Dec 15, 2006 3:08 pm    Post subject: Reply with quote

Just the one. No need to be greedy. Just kidding, the old lady was less than pleased to have to shell out 400 let alone 800. I had gone through a fiasco with another seller. He tried to sell me a bum turbo for 100. He had the same problem with his that I had. The hotside housing cracked and destroyed the turbine fan. When I inspected the unit he had filed down the blades to hide the evidence. Saw right through it though. I can't wait to strap this sucker on though. I think I am about a week from starting my car for the first time in ten years!!!

Geoff
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