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K27 7200 or s

I've got a k27 on its way to accompany my recently installed Kokeln IC. I am going with the k27s after considering both the 7200 and the s model. I am interested in hearing from the brain trust on opinions of both.
Old 12-10-2009, 03:05 PM
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I love the K27S on my car... night and day difference from the stocker for sure.
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Old 12-10-2009, 03:48 PM
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Did you change the size of the down pipe from the CIS metering plate or bolt up to the stock setup?
Old 12-10-2009, 04:08 PM
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Quote:
Originally Posted by Garrison View Post
I love the K27S on my car... night and day difference from the stocker for sure.
Don't be shy...answer the question. Of course a K27 is much better than the "stocker" 3LDZ. But as to the comparison K27 vs. K27S?

I run with a 7006, and have a 7200 on the way to show up any day now.
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Old 12-10-2009, 04:17 PM
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Mark Did you chose the 7200 over the S for a specific reason?
Old 12-10-2009, 04:36 PM
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i thought a 7006 and a k27s were one in the same
Old 12-10-2009, 04:37 PM
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Originally Posted by xbmwguy View Post
i thought a 7006 and a k27s were one in the same
Nope. K27 7006, 7200, K27S, K27HF (I think).....bunch of variations. I believe the "S" starts out as a 7200 and is reworked, but I'm not the expert on these.
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Old 12-10-2009, 04:47 PM
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Mark Did you chose the 7200 over the S for a specific reason?
Yep....the price was right for a rebuilt with supposedly minimal miles on it. This will help round out my experience between the stock 3LDZ and my current 7006. Just looking to move the boost threshold down a few hundred rpms.

The S is probably the way to go from what I've heard. It's simply a retooled and better version of the old 7200, I believe. Again, I'm not a turbo expert and am really quite pleased with what's currently on my car. Makes good HP, and will boost until the cows come home, but I'm running a street machine that would be better suited with a lower threshold.
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Old 12-10-2009, 04:56 PM
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Originally Posted by xbmwguy View Post
i thought a 7006 and a K27s were one in the same
The K27 7006 and the K27S share the same bearing housing but thats it.
The K27 7006 is an origonal KKK Borg Warner turbo while the K27S is a hybrid UMW turbo.

The K27S uses a K27 7200 bearing housing and hot side (turbine wheel and turbine housing) but the compressor side has a 3" inlet that tapers down instead of the 2.75" inlet of both the K27 7200 and K27 7006.

I do not know if the UMW K27S uses the same compressor wheel as the 7200 but from the pictures I've seen the compressor wheel inducer looks alot like a 7200 wheel.
You would have to take the compressor housing off the backplate to see the rest of the compressor wheel and measure it to see if the wheels are the same.
Old 12-10-2009, 05:03 PM
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I believe the K27-7200 was designed just for the 3.3 CIS and is a near ideal turbo for a CIS 930 w modest mods though I ran in on a C2T w ports, cams, larger inter-cooler and a lot more improvements.

It comes on fast and hard compared to larger compressor wheel K27 hybrids that seem to come on more like a V8. With a low restriction exhaust and the right set up they can be on full boost by about 3K rpm.

It is just big enough for a 930 and starts to run out of air about the same time one hits he fueling limits of a stock fuel head and WUR.

It's HP limit is about 360rwhp. If going for big hp then the larger turbo is a must as it will keep flowing air and do so at the upper rpms more efficiently.

The GT-35's are something to look into as they seem to be able to act like the 7200 but can make more HP but require some work to adapt and may or may not be as sturdy.

It has been a while but I had a K29 & early HF and ended up back w the 7200 because I liked how it came in even though it did not carry higher rpm. I found it more to my personal liking. However, all seem to love most what they are running or selling but they are all good options.

Last edited by 911st; 12-10-2009 at 05:07 PM..
Old 12-10-2009, 05:05 PM
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I do not know if the UMW K27S uses the same compressor wheel as the 7200 but from the pictures I've seen the compressor wheel inducer looks alot like a 7200 wheel.
When I bought my K27S from UMW about a year ago, I asked Kevin about this and he said that the wheel is untouched...only the housing is modded from standard.
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Old 12-10-2009, 06:06 PM
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Got my 7006-back in 1994-didn't drive the car for 10 yrs. I have currently 15,000+ miles on the engine & turbo. Personally, some people say the turbo doesn't have top end or not enough. For me. Walking a ZO6-40mph+ to 110mph with old technology and a stock intercooler speaks for itself. Yes, I have cams in the car and some xtra goodies. What I care about is Top End/Hwy. City driving really doesn't matter to me.
Old 12-11-2009, 04:26 AM
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Quote:
Originally Posted by wjfk32 View Post
Got my 7006-back in 1994-didn't drive the car for 10 yrs. I have currently 15,000+ miles on the engine & turbo. Personally, some people say the turbo doesn't have top end or not enough. For me. Walking a ZO6-40mph+ to 110mph with old technology and a stock intercooler speaks for itself. Yes, I have cams in the car and some xtra goodies. What I care about is Top End/Hwy. City driving really doesn't matter to me.
Please describe the other mods to your car to walk a Z06?
To stay on post:
I have a k27S and it has the 3 inch inlet tapered to the compressor wheel. Works fantastic and pulls all the way to redline. Can only compare to OEM k26 and night and day difference.
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Old 12-11-2009, 05:04 AM
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You need a solid 400whp in your 930 to keep up with a new 505HP Z06.
A buddy did this using an HFS, headers, cams, head work and tuned AFRs.

Yes the "S" mod is an enlarged machined conical cold side inlet on a 7200. Cost is $100 over the standard 7200. Mod is good for 300rpm threshold on a stock 930 but you need to enlarge the down pipe to take full advantage of it. That mod was designed to be used with the stock 965 down pipe as it is less restrictive than that of the 930.
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Old 12-11-2009, 05:23 AM
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My car is a 82-911SC Targa-I did a top end rebuild-rockers/bearings/oil lines etc.etc. in 1994-89-3.3 turbo. Approx-15000+miles, engine/turbo,Did it with my mechanic. My/Mods-Euro/headers-ported heads-7006-Honed-cylinders/Turbo-Hks-fuel enrichment-1bar spring-magnecor wires-K&n filter/air box cover off-SC Cams-B&B 3inch exhaust,upgrade the fan blade-No ac-unit.Also rebuilt the 915-5speed-top end 140mph.cutoff 6000rpm. short shift/-Recently this year.-upgraded the ignition to Msd-6al &coil/new injectors,fuel pumps,fuel accum.,fuel filter/front oil cooler-bradied lines,/bilsteins frnt-HD- Sports/yellow in the back.New front spolier....I'm sure there is stuff i left out.

What I know is that my car is light and the gearing plays a big part. Just with the cooler weather 50's the wheels spin in 2nd gear..I only get on the car in 3rd gear.. I don't need any more damage in lower gear if I can help it..Things can break $$$$$$.

The zo6 I played with, thought i was nuts and few screws loose...I was in 3rd gear when i went side by side..approx 40+..As long I am in the( boost cycle mode). We did two runs and walked him twice. The 2nd run he down shifted--it still didn't matter. Got a thumbs up..And that was that... I know his exhaust is one loud mother...

Last edited by wjfk32; 12-11-2009 at 10:28 AM..
Old 12-11-2009, 06:03 AM
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pic of my car
Old 12-11-2009, 06:09 AM
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The 7006 was Porsche's go to turbo for there special 1992 S2 Turbo that was based a 92 C2 Turbo with cams, bigger inter-cooler. This was offered to qualify the turbo for I thin IMSA racing back then. It was $10k option installed by Andial for the factory.

It is interesting in that the compressor wheel is just a touch smaller than the 7200's so you would think it would be a lesser turbo.

However, they made the hot side larger which put off boost for about 300rpm and lowered back pressure in the exhaust system. This made the motor run more efficiently and thus made more some +20 or so HP in the power band. I wish I knew if it was a larger hot wheel or more of a larger housing.

I think the K29's and RUF turbos might have been built on a 7006's hot side but w a larger compressor wheel. That would increase the efficiency in the exhaust and the efficiency on the intake side. The K29 was another early Hybrid I suspect and it was the go to turbo for getting to 400hp or so. They would get to full boost came in by at about 3600 rpm compaired to about 3200rpm w a 7200 if I recall correctly. Of cource set up move this around.

I have seen a 7200 reach .8 bar before 3000rpm on a well set up car.

If I build another 930 it will be more for DE's and I will look to somthing more like a K29 or HF based on a 7006 hot side if possable. Or I might just try going with a GT35 style turbo.

I suspect of the issues w a 930 is the restriction before the turbo from the metering system. Turbos just do not like any restriction before the impeller or after the turbine. I suspect putting larger compressor wheels exadurate this issue at lower rpm and work against response. A larger compressor dose increase effecency once up to steam. It also moves air a bit quicker but it has to work against the hot side to do so. This makes for a bit earlyer boost onset ad a bit later full boost which makes it come in in a more progressive manner.

Sorry for the rambelings. Just what I belive so far. The cool thing is we have a lot of options now.
Old 12-11-2009, 08:21 AM
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Thanks ! RarlyL8 , my new K27S arrives today to CHILE !!!

Max
Old 12-11-2009, 04:29 PM
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Thanks ! RarlyL8 , my new K27S arrives today to CHILE !!!

Max
Oh boy, aint that purty!
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Old 12-11-2009, 05:57 PM
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