Many race cars have a feature where they flip a switch to disable the fuel or spark to allow cranking the engine to build oil pressure before startup. I'd like to do this to my 997.1 Turbo. What's the best way to do this to avoid throwing trouble codes?

 

I do that when I put the engine back in the car: pick up off the both fuelpump fuses and let the oil pressure build.
Not easy daily...

 

Now that's a great idea and an invention waiting to happen!

 

Thanks, shouldn't be too hard to put a relay in to make/break those two fuel pump circuits.

 

That is what I was thinking. A switch to keep the connection on the two fuel pumps broken, while you turn it over, then flip it back when ready to start....

Or...If really clever, perhaps a relay that makes no connection for "X" seconds of power applied, then connects. Then you could just turn the key, and the first few seconds, car would just turn over and oil the engine, then pumps come on and it starts??

Good luck with it. Be sure to post if you make any progress....

DC

 

No idea if there is anything about the 997 platform that would make this an issue, but this is the go to solution on other platforms:

http://www.accusump.com/

 

Interesting...I once installed an old military surplus accumulator from an aircraft onto my old 1980 Lotus Esprit that used to knock on startup. It helped, but the accumulator didn't hold much oil so the oil pressure needle barely lifted off the peg when I opened the solenoid valve. I see accusump has a couple of 3 quart units though...

 

Seems as if we're trying to find a solution for a problem that doesn't exist - have there been engine failures or engine damage due to start up oil pressure?

 

New to Porsche, but most cars retain fuel pressure in the line, so a fuel pump cut is a bad idea. You would need an injector cut to achieve what you are trying to do and that's probably going to throw a code

 

I have noticed recently (as I don't get to drive my 2007 turbo) that often that after about 4 weeks when I start the car for about 3-5 seconds the oil pressure gauge hovers towards the bottom and I hear a clapping sound (not ear popping but fairly loud) and a couple of times I got an oil pressure too low warning on the dash!

I don't think it will have huge long term effects, but an annoyance nonetheless. Last time I drove the car, I turned the key to start and shut it off quickly (so the engine didn't start) and tried that about 4 times before fully turning on the engine. It did seem to help.

 

I have a 2007, it dont do this even after 4weeks, maybe you have an actual issue to look into?

 

I winterize the car as per the usual recommendations and one of them was to start the car monthly. It was suggested to pull the coilpack fuses and crank the car a couple of times (to circulate oil?). Then put the fuses back in and start the car normally. Again, this isn't something you'd want to bother doing daily but certainly no biggie to do it monthly in the winter.

 

I don't mean to be a jerk, but where is this recommended? Doesn't sound like a good idea. This will likely cause cylinder wall washdown (ring wear/cyl wall wear from lack of lubrication) and oil contamination, as fuel will be injected, but not combusted.

Sure it wasnt the injector fuses?

 

You may be right, it might have been the injector fuse. The idea was to spray some oil from what I remember. I will check and post back.

 

It is fuse D7 - ignition coil/ injector valve. I assume that means no fuel will be sprayed. There was a thread a couple of years ago recommending this method - in a discussion about winterizing the car. The idea was to circulate some oil before the car actually started.