Saml01

I googled for a bit and couldn't find an answer so I thought id post. Do you guys know the first year the 911 came with OBD 2?

I want to say 94 maybe 95 based on other experience but it could be different with Porsche.

Thanks.

User 040621

96 I think

Ed Hughes

It was '96. '95 was the last OBD1 year, but some of the last units that year were showing OBDII ports, but not the full system yet, I believe

budge96

I believe all manufacturers delivering vehicles to US market were required to institute OBDII in 1996

Lorenfb

Ed is right on!

JackOlsen

It's why the '95 motors are the most sought-after for swaps.

Ed Hughes

...also why '95 993's are sought by some in Calif, in light of the possible frustration of OBDII and SAI issues.

Saml01

What kind of swaps?

Lorenfb

"in light of the possible frustration of OBDII and SAI issues."

But there's always some tradeoff: i.e. The '96 and later have VarioRam
which provides more low end torque. So for some, the SAI/monitors
headache is worth the extra torque.

JackOlsen

Yes, Porsche kept extracting more out of the air-cooled engines right up until the end. But the OBD2 computer is a trickier dancing partner when it comes to things like defeating drive block security when the engine is swapped into a pre-3.6 car. It can be defeated, but it's more costly. And adapting the DME programming to things like a lighter flywheel is also much simpler on the OBD1 engines.

Saml01

Can you elaborate on what drive block is, how it works, and what its security checks are?

Ed Hughes

I've driven V-ram engines, and I've not missed it on the '95. But, I know many prefer them.

Saml01

While im picking your brains. What are the hoses circled in red for.


I know they are connected to the exhaust manifold, but why?

Ed Hughes

Those blow air to the cabin for heat.

Saml01

I assume it passes through a heat exchanger and meets up with the rest of the exhaust afterwards?

Got anywhere I can go to see a 360 of the engine in its assembled state? I went to pelican parts and they got a build there, but the guy took pictures at all the wrong angles.

Anyone measure the difference in spool characteristics with it and without it on turbocharged engines?