what is this tube?

[smartrepair]

After installing the 3.8 S engine (US specs) to my MY99 996 (US specs), I found out that there´s one tube wiothout connection.

Where do I have to plug it? Something to do with Variocam plus?

Thanks

Kare

[hi8ha]

There is another rubber tube towards the center of the pic to the righ, much smaller that the tube you are reffering to but dissconnected as well.

[SH-GT3]

I'm interested in hearing about your conversion. What ECU are you using? What wiring harness?

[Orient Express]

The skinny tube is a vacuum hose. Check to see if there is a vacuum storage canister bolted to the right rear side of the engine. If the vacuum hose is connected to that, it is from a PSE installation.

The larger pipe may be a breather vent.

[esq996tt]

Tube connects to the brake booster vacuum line.

[PTEC]

Tube connects to the brake booster vacuum line.

Yep. The 997 uses a mechanical vacuum pump which is driven off the bank 2 exhaust cam to supply vacuum to the brake booster. On a 997, that hard line comes off the pump and goes to booster. Good luck with your swap. Edited March 17, 2009 by PTEC

[smartrepair]

There is another rubber tube towards the center of the pic to the righ, much smaller that the tube you are reffering to but dissconnected as well.

The small rubber tube goes to the airfilter unit (as far as I know)...

[smartrepair]

I'm interested in hearing about your conversion. What ECU are you using? What wiring harness?

The DME is 7.8 from 2004 996. The middle chassis wiring harness is from a 2003 coupe, I have a cabrio, so I took the convertible part of the old harness and added it to the new harness. Changing the harness was quite a challenge.

The DME needed matching immobilizer and keys.

The fuel system is different, I installed a universal fuel pressure regulator. The new system is returnless, so I just plugged the return line. The egas pedal has been installed as well, no big issues.

Still to be resolved: the power steering pump connectors are different. Installing later type instrument cluster and change some wiring on it.

The engine came with 997 flywheel and clutch. I installed them to the 996 gearbox, but the engine does not turn around! So I will have to change to a 996 clutch.

Looks like it´s the clutch plate which is different...

The engine fires

[alstarz88]

the small pipe looks lke the one that actuates the butterfly in the pipe linking both inlet plenums