Need a K27-7006 Map

[jonesb930]

Does anyone have a map for a K27-7006 Turbo?

Thanks,
Bill

[911st]

Bill,

Not one seems to be responding so you get my two cents.

I have looked all over the internet and have not been able to fine one.

Brian / RarlyL8 sells KKK's sot he might have one.

I may be wrong but I belive the only functional differance between the k27-7200 and the K27-7006 is on the hot side. I belive the inducer and exducer's are mostly the same size. That dose not mean one can move parts between them to my knowledge. The 7200 I think is a little newer design.

The larger hot side moves the full boost point up about 300-400rpm, creates less back pressure, and allows them to make more HP.

If you come by one please let me know as I would like to see it.

[JFairman]

"I belive the inducer and exducer's are mostly the same size."

I'm not a turbo expert either but I've gotten a small education from talking to Bob at Durabilt turbo and reading on the internet combined with my own expensive experiences with a certain K27 hybrid turbo.

Just wanted to try and make it clear that that the bearing housing and it's internal parts are the only section that is the same between a K27 7006 and 7200.
Looking at these two different K27 turbo's side by side it's very obvious to see that the turbine and turbine housing is bigger on the 7006 and you explained well what the result of that is.
The 7006 turbine housing, shaft, and bearings also run cooler than a 7200 because of the lower backpressure. The exhaust ports and exhaust valves and guides on the motor may run a little cooler with a 7006 under boost because of the lower back pressure too.

When looking at the "inducer" or entry area of the compressor wheels on the 7200 and 7006 they look similar, but the larger diameter part of the compressor wheel you can't see or "exducer" is different.
The 7006 compressor wheel is smaller than a 7200 compressor wheel but the 7006 turbo makes more horsepower than the 7200 on a 930.

compressor wheel:

[jonesb930]

what would be the horsepower limitation on an EFI 3.2 short stroke (3.0 with 3.2 P&C) engine? I am at a point that I need to decide to use my K27-7006 with stock Euro exhaust or use a set of K16's with a custom headder ($$$). I have the turbo's for either setup but would need the headders for the twins.

Other bits about the engine: 3.0 Turbo (930/50 Engine
3.2 EFI intake
Heads port matched and lightly ported
GT2 EVO Cameshafts (Webcams)
72lb injectors
Motec M600 ECU
7.0:1 CR 3.2 big bore P&C set from our host
Case mods include, Boat tailed, knife edged crank, 964 oil pump, shuffle pinned.

[911st]

JFairman


That sounds right.

Do you have the wheel specs?

I have never seen the two side by side. Some 7 or 8 years ago I used to have the specs and now that you mention it. I used to wonder what would happen of one put a 7200 compressor side on the 7006. Not a big change. I guess for the effort most go with a larger compressor wheel (HF & K29 quick spool's) in search of more efficiency on the compressor side and extended boost up top.

A more esoteric idea would be to put a larger hot side on the 7200. Some have played with clipping the hot side but I do not believe that is a good thing to do.

I suspect that when the ratio of the compressor wheel to turbine starts to get more extreme like with the HF's or K29 quick spool's, this slows the "spool time" from boost-on-set to full-boost and increases the pressure in the exhaust.

Good turbo tuners check the pressure in the primary exhaust section. That seems to be missing from the modified Porsche K27 group.

[JFairman]

Hi Keith,
I don't have the compressor wheel specs because I havn't researched that but they must be out there on a website somewhere.

A phonecall to Bob at Durabilt might give satisfaction to you. He's VERY experienced and he's old school and I respect that.
He is also familiar with the popular turbo builders in this country, their product, and their work backgrounds and history. It's a relatively small community and word gets around.

Bob is personable and chatted with me for a while.
Maybe he wasn't busy at the time or maybe it was because I told him Kevin Jeanette at Gunnar Porsche Racing recommended I send my turbo to Durabilt to be repaired.

Anyway, a phone call to him may be interesting.
His number is on their website.
http://www.durabilt-turbo.com/

[911st]

Bill,

Your build could make 500+ hp depending on boost level.

The k27-7006 will probably make around 425fwhp. I suspect the K-16's are a little above this but I am not an expert.

You could benefit from a larger turbo like a GT 35. I suspect it is as efficient at 500hp as a 7006 will be at 400 but not sure.

K27-7200:


GT-35



Please verify this information.

[jonesb930]

Thank you all for the information thus far. I have a bit of time before I seal the deal on the direction I am going in. When it really gets down to it the easiest route for me would be to use the K27-7006 with my existing exhaust. My EFI intake has been modified to be used with a stock, or aftermarket intercooler from a standard 930. I had a C2 intercooler but let it go a while back thinking I would be going the twin route. My biggest issue is time. It would take the least effort to get it up and running with my K27. I could always do the twins at a later date when time and money are more available. It would be nice to verify that I am not going to have any dangerous conditions with my build using the K27-7006 though. I guess I could put in some sensors and log pressures and EGT's to make sure things are cool. A Map would be REALLY Helpful.

Bill

Bill

[911st]

Bill,

Going with the 7006 and watching things is a solid plan. It will be much easer and less expensive to go to a larger turbo later if you decide to do so. Twin turbo sounds sexy but is not necessary.

[jonesb930]

I here you. It will be a lot of work. I have already done so much now. I just want my car back! Its hard seeing it in the garage all apart! I built the bottom end to handle BIG HP just because "I was in there" and had expendable cash at the time. I can alway add on later. So I guess I should start looking for an Intercooler.... I can almost here her running... :-)

[jonesb930]

Eureka!!!! I found one!!!! Not the best image but it should work. Looks like a picture of a paper map from way back when.

[RarlyL8]

I do not have a map for the 7006 but you can probably google one. That is an old turbo with late spool characteristics. It is also on my list of turbos to dyno. I made a deal to buy one recently but never received the turbo. If you decide to upgrade I would be interested in yours for this purpose. Can take it in as trade if you wish.
The headers I have designed lend themselves to use in twin turbo applications. I am building a set right now for twins. Price is not too bad.

[JFairman]

I took the image to photoshop CS3 and removed the barrel distortion and cleaned it up a little but the jpeg artifacts are too much to clean up.

[jonesb930]

Brian,

I would be very interested in swapping for a twin header setup. I am still on the fence on going twins. The headers are my big concern. I have the turbos.

JFairman,

Well done! Much easier to read now.

Bill

[RarlyL8]

I assume you will use K16 or K24 turbos.
Twin turbo headers with short secondaries for rear mount are ~$2000. Design is flexible as the secondary pipes are custom.
Shoot me an e-mail with specific questions.

[jonesb930]

I have a pair of k16's. I would love to see a pic of it in place to see the clearance to sheet metal etc. Intercooler design would be my next need.

[jonesb930]

Originally Posted by RarlyL8

I assume you will use K16 or K24 turbos.
Twin turbo headers with short secondaries for rear mount are ~$2000. Design is flexible as the secondary pipes are custom.
Shoot me an e-mail with specific questions.

Brian, Did you ever build this set of headers we discussed? I am leaning towards the twins again. What is the lead time for these headers?

On a side note (discussed in another thread) I have determined that my Single K27 is a Hybrid with a K29 Compressor wheel machined into the housing. The Turbine is a 7006 though.

[RarlyL8]

Bill, we are building kits for custom applications. Shoot me an e-mail with specifics and I'll put something together for you. Can take your hybrid in on trade if you wish.

[Thierry25]

Originally Posted by jonesb930

Brian, Did you ever build this set of headers we discussed? I am leaning towards the twins again. What is the lead time for these headers?

On a side note (discussed in another thread) I have determined that my Single K27 is a Hybrid with a K29 Compressor wheel machined into the housing. The Turbine is a 7006 though.

Interesting turbo ! It sounds exactly what I would like to install on my C2T. Do you have some picture of it ? Was it great on your application ?

[jonesb930]

It ran very well on my 3.0 CIS Turbo. I purchased it from Andial.

Hear are some images:






Side by side with a 3DLZ (K27/29 on left)


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