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EFR's are a very long turbo thanks to the CHRA and turbine housings. They can be tipped far more out of level than almost any other turbo for fitment. If you run the twinscroll EWG housing are going to have two wastegates plumbed? Space is going to be tight.
If iwg wont work, Ill have to. I want twin scroll since big 4 engine is ideal for it.
Thanks. I figured I want the full potential, and 968 head should do the job. I am very paranoid about multivalve heads and cracking problems associated with them, but after head myths thread and lots of research, I decided to try. I can still find another if it cracks.
Just finished cleaning underside of valve cover. One could eat off of it.
Any ideas on how to solve this turbo mount incompatibility? I was thinking stainless spacer with one extra bolt for turbo and thread hole for long bolt trough turbo mount..
err...now that i look at your plot...if you have done it right you will run out off the efficiency isle at 5k rpm, where is the stall limit on that map?
Are you sure your engine will flow that much?
If so, i would say you need a bigger compressor...or run 1.8 bar
Any ideas on how to solve this turbo mount incompatibility? I was thinking stainless spacer with one extra bolt for turbo and thread hole for long bolt trough turbo mount..
I would expect to stay in the highest efficiency isle towards the top end of RPM and not to go out after engine peak torque.
With the graph estimation you posted i would expect high temps above 5000RPM, and i immagine you will have to use a massive intercooler to cope with that...also perhaps ignition retard will have to be more drastical.
Dont mean to intrude, but here is my initial graph estimation from before i had the K27 mounted on the 924 with 0.9bar target boost
And here is the correction, a more elaborate graph after instalation and use with 1bar target boost: ok maybe a bit pesimistic on lower RPM flow but even if thats true its still quite ok as its on the 65% efficiency isle at 3000RPM already.
K27 is an 30+ years old turbo, EFR 7670 design is 5 years old. If you look at Penerin testing of this turbo, they run it off the map too and have this to say:
Again we were running this off the map and it was still making lots of HP, so its not bad to run it off the map necessarily.
Also this guy is running smaller 7046 EFR on his 2.5 turbo and he has great results, I think one size bigger EFR 7670 rated up to 650hp shuld cope with 3.0 16V quite good.
Since it will be mostly sunday street car with maybe one or few track days a year, I want it to be super responsive, so I didnt want to go with one size bigger EFR 8374.
K27 is indeed a dinosaur
That sounds great and it looks like you're going to get a super responsive system.
Not much until you get to drive this thing then?
At the moment I have a bit of a problem with changing piston crown to 4V dish.
Its business as usual here, everybody wants to earn big time since its porsche something.
First estimate for CNC I got was 1500€.. Gotta love the optimism
I also need all the rubber hoses and related stuff, some sort of intake, exhaust, brakes.. Lots of details, but Ill get there eventually..
03-25-2015, 05:34 PM
