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Which Turbo Should I Go With?

On my 86 930 with 60K miles? I'm concerned about reliability and not having to modify things to much to do the install. I run GSF headers, no cat and GHL exhaust. What other items if any would I also need? Thanks
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Old 09-29-2007, 04:12 AM
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If yours still has the origonal one and you don't want to add fuel enrichment devices and spend a lot of $ a K27 7200 and a 1 bar boost spring would be a good upgrade worth around 30 more horsepower.

You can take a chance on hopefully getting a good used one for around $700.
You never know if it's been hurt though...

The K27HFS is supposed to be the best but you need to add fuel enrichment up top and I've been told the origonal .8bar boost spring is safest for engine life with pump gas and the HFS.
You'll want a higher flowing, more efficient (half bay with your AC condenser still in place) intercooler too.
Old 09-29-2007, 09:31 AM
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I would contact Chris at TurboKraft and look into a Garrett turbo. I run the GT35R in my car with EFI. While this turbo is probably too aggressive for a CIS car you could talk to Chris and see what he recommends for your particular application.

He is a great guy to deal with. If you decide to go Triple K then I would talk to Stephen at Imagine Auto. I purchased my last turbo from him. Also great to deal with and always helpful on the phone.

Hope this helps............................................C hris
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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 09-29-2007, 04:33 PM
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At 1 bar with any turbo I'd want adequate fuel over stock, "but that's just me"
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Old 09-29-2007, 06:41 PM
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There are no "bolt-on" aftermarket turbos.
The closest you will get is the K27 series or any other that has the same flange pattern. For the K27 series you must modify the turbo bracket a bit and either buy an adapter for the up-pipe or cut the end off of yours and use a few inches of hose to connect.
Do some turbo research before you buy. Know what your goals are and how you intend to use the car. If the internals, boost, and IC are left stock you might not want a big turbo. Something like the K27S might work better for your needs in that application.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 09-29-2007, 07:05 PM
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I'm not trying to build a race car I'm just looking for a little more power without all the headaches. So what would you guys recommend.
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Old 09-30-2007, 11:14 AM
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Whats your headache threshold?

You could just put a 1 bar spring in your wastegate and see what that does for you.
Then when you get used to that and you want more. . .
Old 09-30-2007, 11:27 AM
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I think that by going to the Garrett turbo you are going to get far superior response time and the car will feel faster as a result!!! There are many variants available in the GT series that would make you a happy camper!

Sorry to say but my Garrett was a direct fit. Call Chris at TurboKraft and he can tell you all about it.

My Garrett GT35R needed no modifications to my existing exhaust flanges to make anything work. I do use a new custom muffler but my old GHL muffler designed for the factory turbo would have bolted right to this turbo. The header to turbo flange was also a direct fit. Most people think Garrett turbos use a V Band clamp to fit your exhaust to but you can order them either way.

Just a little more info to help open up some options for you. Chris also has an install kit for the oil line that properly restricts oil volume as the Garrett ball bearing unit operates on much less oil than the Triple K unit does.

Hope this helps...........................................Ch ris

You can get in touch with Chris at www.turbokraft.com or 602-481-0264
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Old 09-30-2007, 02:54 PM
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Chris,
I think you have used a K27HF variant before? How does that compare to the GT-35r, particularly at the top end?

How are you cooling your turbo?

thanks!
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Old 09-30-2007, 03:41 PM
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Quote:
Originally Posted by Gumba11 View Post
I think that by going to the Garrett turbo you are going to get far superior response time and the car will feel faster as a result!!! There are many variants available in the GT series that would make you a happy camper!

Sorry to say but my Garrett was a direct fit. Call Chris at TurboKraft and he can tell you all about it.

My Garrett GT35R needed no modifications to my existing exhaust flanges to make anything work. I do use a new custom muffler but my old GHL muffler designed for the factory turbo would have bolted right to this turbo. The header to turbo flange was also a direct fit. Most people think Garrett turbos use a V Band clamp to fit your exhaust to but you can order them either way.

Just a little more info to help open up some options for you. Chris also has an install kit for the oil line that properly restricts oil volume as the Garrett ball bearing unit operates on much less oil than the Triple K unit does.

Hope this helps...........................................Ch ris

You can get in touch with Chris at www.turbokraft.com or 602-481-0264
I tried going to his page but it wont let me click on anything but his gallery.
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Old 09-30-2007, 04:19 PM
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Does anyone have any experience with the Kokeln turbos, ceramic or regular? When I spoke to them they said that they spool up sooner and develop more horsepower than K27 types!




kokeln.com
Old 09-30-2007, 05:00 PM
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I tried to send an email off to them but they don't have an email address
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Old 09-30-2007, 05:25 PM
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Call them! (949) 609-0250 They returned my call. Super nice/informative of all pros and cons.
Old 09-30-2007, 06:11 PM
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Just FYI:

Post #22 - Link

Post #42 - Link


Basically, the K27 hotside (turbine housing) has the same bolt pattern, shape and size turbine inlet and outlet flanges of Garrett T3 frame turbos. While they don't appear to be 100% identical and I'm sure there are size differences in the overall length of some Garrett turbochargers vs. K27's, the mere fact that the turbine side inlet/outlet are the same means there is a huge selection of T3 frame turbos on the market that it seems have been completely overlooked by this community. For example, there are Precision Turbo "SC" series t3/t4 hybrids (still a T3 frame, though you have the option of a T4 turbine housing if necessary) to cover anything from say 200hp to as much as ~700hp in a T3 frame turbo. Ballbearing GT35r a bit expensive you say? No problem as the PTE SC61 series use a real 35r compressor and are almost identical in size on the turbine side, only difference is it is a journal bearing turbo (DBB is an option though) and they are typically just ~$700-850. Not bad for an excellent quality 600+whp capable turbo. They have such a huge lineup that they have equivalent turbos for pretty much every GT series T3 frame model. Not to mention, there are plenty of other t3/t4's from companies like Turbonetics that are affordable as well. Anyways, I just thought it was worth mentioning as with the T3 framed turbos there is a whole world of other options out there that it seems many here might not have thought about.
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Old 10-02-2007, 11:01 AM
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The T3 is a know entitiy. The trouble is most, if not all, are water cooled. That is a problem that most 930 owners don't want to deal with. It's bad enought that the K27s are not true bolt-ons.
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Old 10-02-2007, 01:58 PM
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Actually, there are plenty of oil only T3's. Precision Turbo gives you the option of oil only or both oil and water.

K27's not true bolt-ons? Hmm, I guess I'm a bit confused. I realize earlier 930's came with the 3LDZ, and I'm not sure how they are different from the later K27 7006 and 7200's, however I was under the impression that all of them were still K27 frame turbos? Are you maybe just referring to slight differences in fitment such as a bit of custom work on the intake side? If so, that's really not that big of a deal. It's usually a lot easier to fab up some custom intake piping and/or couplers as opposed to trying to re-work the exhaust side (new muffler section, modifying or replacing header turbo flange, etc). Take what I say with a grain of salt as technically I own a "wannabe" 930 and not even the real thing.
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Old 10-02-2007, 03:18 PM
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Thanks for all the Info guys. It looks like I'm probably going to go with the K27S which I feel is the best one for me. It should add about 35HP. I was told by two different tuners no modification is necessary and will bold right up.
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Old 10-02-2007, 03:44 PM
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brian, you will style have to either use an adapter or cut you i/c hose and possible slot the turbo mount. ( i just got that turbo a few weeks ago)
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Old 10-02-2007, 03:59 PM
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Quote:
Originally Posted by Porschefile View Post
Actually, there are plenty of oil only T3's. Precision Turbo gives you the option of oil only or both oil and water.

K27's not true bolt-ons? Hmm, I guess I'm a bit confused. I realize earlier 930's came with the 3LDZ, and I'm not sure how they are different from the later K27 7006 and 7200's, however I was under the impression that all of them were still K27 frame turbos? Are you maybe just referring to slight differences in fitment such as a bit of custom work on the intake side? If so, that's really not that big of a deal. It's usually a lot easier to fab up some custom intake piping and/or couplers as opposed to trying to re-work the exhaust side (new muffler section, modifying or replacing header turbo flange, etc). Take what I say with a grain of salt as technically I own a "wannabe" 930 and not even the real thing.

Yea if I wasn't so lazy I would have definately went with a gt series garret, maybe over the winter i will get some ambition...maybe a gt32r?
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Old 10-02-2007, 04:01 PM
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My definition of "bolt-on" is take one off and put the other in its place, not buy an up-pipe adapter and re-welding the bracket. You need to know what you're getting yourself into to make an informed decision.
If there is an appropriate T3 flange bolt-on Garrett with oil cooling bring it on! Tell us what needs to be done to mount it up.
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Old 10-03-2007, 05:09 AM
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