Bernard

I'm very close to pulling the trigger on a new turbo, just trying to decide which one to go with.

Once I have it installed how do I prime it before I start the engine? Pull the coil wire?

A930Rocket

I would try to pour some oil in the line first, then turn it over with the coil disconnected until you have pressure.

JFairman

I've got a brand new K27 HFS I bought from another member here a few months ago.
I feel like taking out the low mileage K27 7200 thats in mine now and installing the HFS soon along with an adjustable warm up regulator.

What is the break in procedure and RPM limit and for how many miles should you practice an RPM limit with a new turbo?

My car already has a garretson halfbay intercooler, B&B headers/heat/single out muffler, high lift powerhaus cams (i think they are the powerhaus group b cams), 1 bar boost spring and raceware rod bolts.
I've been told I should take out the 1 bar spring and put in the origonal .8bar spring to keep from frying the motor, but I don't have an .8 bar spring and I never see one for sale so I may just buy a Tial wastegate with the .8 spring seeing as my 20 year old wastegate is questionable anyway...

I have a set of Andial sc330 cams and rebuilt rockers that I'll be installing some time this winter too.

JFairman

It's better to remove the fuel pump relays to keep it from starting if you want to spin the motor on the starter to get oil pressure.

Removing the secondary coil wire and spinning it on the starter to get oil pressure without starting can possibly fry the CDI or the coil.

pdqcarrera

Who told you this? The intercooler helps your cause, otherwise shouldn't be a problem if you're getting enough fuel. The mantra here is get 'er on a dyno and see what's really happening. She'll fry at .8 if too lean. Know thy AFR!! ;-) Cheers!

JFairman

I was told that by Kevin. He's the one that builds the K27 HFS turbos.
He told me this turbo with a 1 bar spring would go over 1 bar and recommended using the .8bar spring.

Kevin

Keep the stock wastegate spring.

nathanUK '81 930 G50

A lot of people have experienced overboost due to how good the HF & HFS turbos are, especially when using short headers. Better to be safe with a spring below 1bar as suggested.

nathanUK '81 930 G50

JFairman, running in takes about 50 miles of no boost. After this, build up boost to 0.5bar several times.

Pulling the fuel relays is better as you do not want fuel getting in the oil too.

911addict

I have the HFS on mine, although currently with standard headers (not for long hopefully).
We put in a 1 bar and tested it on a dyno and it held 1 bar all the way, no overboost at all.
However, on Kevin's advice we put a stock spring back in (0.85 on the 965?) in readiness for the new headers. Kevin also advises to run it in for 50miles to be safe.
Don't know if i'm imagining it, but the turbo does seem to be loosening up now (ie. seems better)...maybe its just that I'm getting more used to the power delivery curve?