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Hi, I'm new to the forum so please excuse my ignorance. I have a 1979 Porsche Turbo and in the process of replacing a failed turbo. Since original turbo is no longer available and my unit was too far gone to rebuild, I purchased a K27 as a replacement. Its not as easy to fit as I expected however I'm making progress. Looking for advice on how to attacht the adaptor on to the turbo - its the adaptor which allows me to use the existing pipe to intercooler ( photos attached -I hope). adaptor is on top of turbo and this pipe fits into adaptor adaptor sits on top of turbo mating surface of turbo is not machined - I have tried to smooth by hand adaptor in situ, has an internal seal but mating to a rough surface
There is a seal included with the adaptor but the surface of the turbo outlet is not machined and I do not know how good a seal this surface would offer. I have seen some kits include epoxy and wonder if I should apply some epoxy as well as the seal ? Does anyone have experience ?
Although some people have found that adapter problematic, I for one did not have any issues back when I was using one. The internal silicone O ring seals ok even on the unmachined surface of the turbo. It's a pretty tight fit to begin with and the O ring is soft enough to compress against any roughness in the turbo casting. The only alternative is to buy a silicone hose/reducer to mate the pipe to the turbo, but you may have to cut off the bottom end of the up pipe.
Give the adapter a try first.
Hello Paul,
I use google translator and hope you understand me.
1. You can rebuild your original 3LDZ (here in Germany there is a company that does this for Porsche AG for many years)
2. I also bought a K27 7200. and then the adappter as you also bought. it did not satisfy me. I have then rebuilt the K27 7200. He then received a 3ldz housing on the cold side, see picture.
further I have the compressor wheel of the 7200 replaced by a 7006.
if you have any questions, greetings from leonberg / stuttgart, dominik
Last edited by Dominik 930; 11-21-2018 at 11:53 PM.
Thank you very much for sharing, I will gain confidence with experience but right now your help is invaluable. As I have the adaptor and K27 already I will try with the silicon seal provided and let you know if it works. If it doesnt, I know have an alternative ( thank you Dominic) - I’m Irish but living in Germany (Wiesbaden) - unfortunately my German is not great !
Making progress, adaptor with seal fits snugly on turbo, turbo support bracket slotted and fits (fitting is still a bit stressed - won't torque up until I have all turbo tubing in place. Rebuilt boost relief valve Slotted the 3 holes mounting to body
Hello Carrpet,
I can't judge if there was a performance improvement, I changed turbos because the old one was worn and leaking oil which pooled in the pipework during low revs and worked its way into the combustion chamber under boost (I got surprised twice when the car worked itself into an acceleration loop under high boost - I had to switch off ignition to stop the acceleration ). The vehicle was new to me so there may be other issues, oil may have been contaminated with fuel etc.
Back to the turbo replacement, I‘m happy with the fit ( using the aluminum adapter) and performance. Seems this is the way to go if you need to replace the turbo. If the original turbo was ok I would not have changed but prefer this solution to a rebuild.
Hello Carrpet,
I can't judge if there was a performance improvement, I changed turbos because the old one was worn and leaking oil which pooled in the pipework during low revs and worked its way into the combustion chamber under boost (I got surprised twice when the car worked itself into an acceleration loop under high boost - I had to switch off ignition to stop the acceleration ). The vehicle was new to me so there may be other issues, oil may have been contaminated with fuel etc.
Back to the turbo replacement, I‘m happy with the fit ( using the aluminum adapter) and performance. Seems this is the way to go if you need to replace the turbo. If the original turbo was ok I would not have changed but prefer this solution to a rebuild.
Thanks for responding Paul,
Probably from my point of view the most important thing is the improvement in spooling. At what revs are you getting the benefit of the K27 boost (ie, how much below 3000rpm) and is there a noticeable drop off above 5000 rpm.
Regards
Peter
11-21-2018, 11:28 AM
930 turbo replacement with K27
