Hi@all,

strange things are happening with my 930 engine after reinstalling it in the car.
When starting the car after a few days in the garage there is a cloud of smoke for a few seconds, then it doesn' smoke again out of the exhaust.
After driving it for lets say half an hour and turning it of I found oil sprayed over the inner side of the hood at the place of the right outer edge of the intercooler.
There was also oil smoke comming from the direction where the turbo is located and some oil drops hanging at the pressure side housing of the turbo.
I put of the intercooler and found oil in it and in the piping from the turbo's pressure side to the intercooler.
The turbo is pumping oil through the pressure side into the intercooler.
It has less then 20k miles on it and the engine is freshly redone with new piston rings a.s.o. no 300 miles old.
What can be the reasons for that ? Might be a first step to do a leak check to ensure that there is no mechanical problem (broken piston ringduring rebuild)?

The other problem that might be connected with the oil problem is, that I have a very strange boost characteristic.
Till 3.5k rpm with no boost normal behaviour (obvious).
When the turbo kicks in the boost pressure is immediatelly jumping over the 1.1 bar mark in between 1k rpm and there is lets say only 60-70% of normal accelaration and power available.
It is hardly possible to rev it over 5.5k rpm. It is like a rev limiter is there.

My setup:
K27
Tial WG
Kokeln IC
IA Fuelhead

Thanks for all your input.

Cheers
Stefan

 

Hi@all,

there is also heavy backfire when going of the throttle after accelaration and the exhaust is bubbling all the time, which also wasn't the case before.

Cheers
Stefan

 

the oil on the decklid sounds like your o-ring blew out on the intercooler pipe....my car used to smoke like a chimney on start up for 20-30 seconds and turned out, i was filling it up with too much oil and it would drain back into the turbo and sit in the housing causing all the smoke. as far as your boost problem, it sounds like you have the vaccuum lines reversed on your wastegat causing it to stay closed, which will give you awesome spool up time but no pressure release and when you hit your 1.1 bar your tripping the overboost protection fuel cut off switch. so what I would do,

Fill it up with less oil.
Everything will read as if you have not enough oil untill the car is up to full operating temp... so dont your guages will read low untill the car is at about 185-190 oil temp on level ground.

Replace the O-ring that sits on the intercooler neck to seal the pipe coming from the turbo to the inter cooler.
Very easy to do, I'd reccomend sealing it with some RTV high temp silicone just as added insurance, be sure to get it seated just right.

Check your vaccuum lines on the wastegate.
try reversing the vaccuum lines on your wastegate. swap the one on the top and the one on the side. you'll find out very quick if thats your boost problem. if it works, you'll have normal boost, if it doesnt, then you'll just trip the fuel cutoff like you are now.

as far as the backfiring and burbling on decel, well, that just sounds like your rich, and your boost leak is making you even richer. once you fix your boost leak you'll get your afrs back in check, and should stop your backfiring, if it still burbles then your just a lil rich. my car burbles all the time and shoots great flames out at night. great fun. rich is good, it saves you cylinder heads.
I hope this helps.
Pete

 

Hi Pete,

Thanks very much for that info.
I will try that today and come back with the result.

Cheers
Stefan

 

Hi Pete,

I just changed the vacuum lines at the wg and - this is my old turbo back again!
It is a difference like night and day compared to before.

I now will go and buy the new sealings for the intercooler and look if I can solve the the oil problem.

Cheers and big thanks,
Stefan

 

Glad to hear it worked! when you take your intercooler pipe off be sure to clean all the oiley residue off of the pipe and rubber fitting down by the turbo with a no-residue degreaser(brake cleaner, etc) keep us updated!
Pete

 

You will also have to reset all of your fuel settings with the new Fuel head!

Glad to see you on the boards!

Sie Sind sehr Gulcklich! Nur eine kline Problem!

Weidersehen!

 

@Aaron,

we reset the fuel settings on the car according to IAs advice to set CO between 3 and 4 with the modified fuelhead.
With my individual setup (Kokeln IC, Tial WG, IA fuelhead, K27, ghl headers, scorpion exhaust) what is your experts advice for the proper ignition timing, as I fear that the original Porsche setting is not able to cope with that setup longtime and may cause some damage again?

@Pete,

thanks again, I will keep you updated.

Cheers and Thanks,
Stefan