Originally Posted by ClickClickBoom (Post 10379699)

Sal,
Finally a wire wizard! As i read the schematic, pin 3 and pin 7 are a loop once the tempostat driven unit in the engine compartment is jumpered. Since the Porsche clutch switch is normally open, I am using the tempostat relay as a surrogate clutch switch, normally closed. Per the Rostra the clutch switch is wired in series to the violet wire.

Originally Posted by scarceller (Post 10379875)

Very good idea to gut an old control unit!

To bad you can't use the stock cruise stalk on the column :(

Originally Posted by spoke (Post 10380443)

My '86 930 doesn't have CC. Is this Rostra Universal kit (250-1223) a good fit for my car? From reading this thread it sounds like those with the unit are satisfied with the results.

Originally Posted by mysocal911 (Post 9366074)

An overly time consuming mod with little benefit in the end compared to a properly rebuilt Porsche CC. Just do a search on Pelican Parts of those who have had their Porsche CCs rebuilt.

Originally Posted by nickd (Post 10380738)

Interesting. Why not adapt a later g50/964/993 unit? They are plentiful used (I have a servo and ecu for sale) and seemingly last forever.

Originally Posted by Brorag (Post 9418754)

Dave, I've been there, did that.
When I rebuilt this car a while back, I sent the Cruise brain out to a reputable repair house here on the east coast. I had it out today and the rebuild date was 2011.
Unfortunately, the early analog units MTBF is high, due to their analog design and age of the boards (many of the components, solder joints and traces are failing). Porsche went to the digital unit in 1988, and that unit had been a big improvement.
Current digital technology is an improvement over Porsche's digital design, and the unit I'm using is commonly installed as OEM on new cars.
I like doing cross country in addition to the local mountains, and have found a reliable cruise unit worth it. If I were doing strict restoration, I might reconsider the old unit, but that's not my goal. I am, however, keeping the OE parts and wiring, much of it insitu, should the next owner wish to backdate it.

Originally Posted by dicklague (Post 10381740)

"DAVE" [not his real name] is an old 911 electric component rebuilder.

Originally Posted by mysocal911 (Post 10383167)

surely one can do more beneficial diys on one's 911 than mickey mousing the wiring and adding
an after-market device for a minimum gain over an original porsche feature, right?

Originally Posted by ClickClickBoom (Post 10381617)

An interesting concept, but there would be a reverse engineering curve.The Rostra is provided with install and schematics to make the install simple. Not to mention the P-car tax associated. My install is running at aprox $240.00, not much you can buy with $240 for a Porsche, even used.

Originally Posted by mysocal911 (Post 10383167)

Surely one can do more beneficial DIYs on one's 911 than Mickey Mousing the wiring and adding
an after-market device for a minimum gain over an original Porsche feature, right?

Originally Posted by nickd (Post 10383395)

I have my completely operational 964 servo and ecu available for $80. I'll even include a copy of the cruise wiring diagram page of the manual along with it for the pin assignments. I would bet that the pre '88 cruise stalk could easily be mated with the 964 functions. Then just add +12v, brake light signal, and the speedo signal. The mechanical servo cable could probably be attached nearly the same as stock. I would wager that system to be much more robust than aftermarket, plus you can keep the original steering column stalk. Just saying ;)

Originally Posted by scarceller (Post 10379875)

To bad you can't use the stock cruise stalk on the column :(