Its great to have cruise working.

[wayne robson]

Since having my 84 the cruise control only worked for about 5 to 10 seconds,
it would start ok then go slow after those few seconds. So i sent the brain off to Kris Rose,-- jamesdean59@gmail.com, just return a weak ago and fitted. Works perfect
both up and down , holds, all great to be able to use it.
Want to thank Kris for a wonderful repair at a very fair price. Can recommend
any time.

[Drymartiniwi]

What was wrong with unit? What was cost of repair? Thanks.


Sent from my iPhone using Tapatalk

[GH85Carrera]

Anyone that ever had a long trip in a car will understand the need for cruise control. Lasy year on the first day of my eventual 5,500 mile road trip my cruise quit working. That evening at the motel I did the easy checks, but no joy. I had to drive the entire trip with my right foot on a the gas pedal.

When I got home I sent my CC unit in for a rebuild and then noticed the real issue, the bowden cable had snapped off. They are no long available new and I had to buy a used one. My CC unit was returned after being repaired. It did indeed have issues. In the past the speed would slowly go down and every 15 minutes I had to set it at a higher speed. Now it holds speed perfectly.

The bowden cable is a pain in the butt to replace, and be sure to use the belts, suspenders, sheet rock screws and duct tape with super glue method to be sure the plastic clip at the throttle connection is secure.

(OK I exaggerate) I just used two overlapping crisscrossed zip ties to hold the connector in place. If it comes out, it can cause a wide open throttle and that is not a good thing.

[wildthing]

I guess I haven't taken my 911 on a trip long enough for me to want CC...

[adias]

Originally Posted by wildthing

I guess I haven't taken my 911 on a trip long enough for me to want CC...

The thing is with today's congested roads, pretty much everywhere, it is hard to use cruise control. But I agree that it should work - all features should work in these cars.

[GH85Carrera]

Originally Posted by adias

The thing is with today's congested roads, pretty much everywhere, it is hard to use cruise control. But I agree that it should work - all features should work in these cars.

You just drive the roads in the wrong parts of the country. There are many long stretches of mostly open roads. I was shocked to see upstate NY as some of the more open roads I have see outside of northern Nevada. Get out of the city, there are many parts of the country where there is on other car in site and the road is wide open.

[Trakrat]

Originally Posted by GH85Carrera

Anyone that ever had a long trip in a car will understand the need for cruise control. Lasy year on the first day of my eventual 5,500 mile road trip my cruise quit working.

First question that comes to mind... where on earth did you drive that was 5500 miles long??

[gazzerr]

You can still get the cable special order from Porsche Classic but it's not cheap. $150 to $200 from memory.

[tirwin]

Originally Posted by GH85Carrera

They are no long available new and I had to buy a used one.

Glen, I bought a new bowden cable last year for my '83. That seems odd that it wouldn't be available for your '85.

[Kraftwerk]

Hmm.. I removed my cc and have never missed it.

[4flyboy]

Wish I had CC in my '84, had it in an '85. Rudimentary but super nice to have on the Vegas run when I wasn't looking to get stopped.

Is it difficult to retrofit?

[wayne robson]

sorry --drymartiniwi, Kris just checks out the whole unit ,not sure what
he does----$80.00.
For those that think that your cruise is only for long hauls---not true works
great at all speeds even short runs around 30 to 50 mph, accelerating and de accelerating with a flick of the stalk.

[88911coupe]

Make SURE the brake disconnect is working! I had a heart stopping moment on the highway many years ago when I tapped the brakes thinking the cruise would turn off, when I depressed the clutch the engine immediately red lined and would not come down till I used the stalk/lever to turn off the cruise control. I determined that the small tab to the far right of the pedal cluster had somehow become bent and would not press the button to turn off the cruise. Its hard to describe but pretty obvious if you can get down there and look. The metal tab, IIRC, is pretty cheap/soft metal and is easily bent. Since its buried back there that's unlikely, although I have no idea how mine got bent in the first place.

[Lyle O]

Originally Posted by tirwin

Glen, I bought a new bowden cable last year for my '83. That seems odd that it wouldn't be available for your '85.

Hey, where did you guys buy them new? Pelican, and every other site I have tried over the last year, show these as NLA. I tried Porsche Classic, and they report it as unavailable, but appreciate my interest and will pass along to the development teams. FYI, LA Dismantlers list one (used, obviously) for $550!

[GH85Carrera]

I bought my Bowden cable from the Pelican parts for sale - wanted section. Sometime they are on EBay.

[tirwin]

Originally Posted by Lyle O

Hey, where did you guys buy them new? Pelican, and every other site I have tried over the last year, show these as NLA. I tried Porsche Classic, and they report it as unavailable, but appreciate my interest and will pass along to the development teams. FYI, LA Dismantlers list one (used, obviously) for $550!

I bought it from the parts dept at one of the local dealerships. They always give me a PCA discount too. It was not cheap but it was a LOT less than that. I'll look through my receipts tomorrow.

[rokemester]

Originally Posted by 88911coupe

Make SURE the brake disconnect is working! I had a heart stopping moment on the highway many years ago when I tapped the brakes thinking the cruise would turn off, when I depressed the clutch the engine immediately red lined and would not come down till I used the stalk/lever to turn off the cruise control. I determined that the small tab to the far right of the pedal cluster had somehow become bent and would not press the button to turn off the cruise. Its hard to describe but pretty obvious if you can get down there and look. The metal tab, IIRC, is pretty cheap/soft metal and is easily bent. Since its buried back there that's unlikely, although I have no idea how mine got bent in the first place.

This happened to me a few months ago and it happened so quickly I had trouble recovering from it. Can anyone describe exactly how the CC should operate, engage and disengage? Thanks!! In the meantime I’ll check my owners manual to see if it covers this by chance.

[rokemester]

Actually the owners manual has an extensive explanation of how the CC should behave. Clearly something is amiss with my disengagement capability. The only thing the manual warns you about is shifting into neutral with CC engaged. This can lead to an over rev.

[88911coupe]

If you can get down near the gas pedal and feel around at the base of the pedal just behind the center console thing you will find a metal bracket IIRC, it's connected to the brake pedal an presses a button/switch to turn the CC of when brakes pressed, its obvious when you can actual get down in there and see. I may have had to use a mirror for better view. I've never used the CC again but I don't use the car for long trips. I probably would on a long highway drive...after TESTING it again first. That scared the crap out of me when it malfunctioned the last time.

[spuggy]

Originally Posted by rokemester

This happened to me a few months ago and it happened so quickly I had trouble recovering from it. Can anyone describe exactly how the CC should operate, engage and disengage? Thanks!! In the meantime I’ll check my owners manual to see if it covers this by chance.

Cruise should work as you'd expect; You can accelerate with cruise on - it should return to set speed after. Adjust speed up/down with the stalk, do what you expect. Switch cruise off, should disengage.

Should hold a steady speed with cruise enabled.

Tapping the brakes disengages the CC entirely. This relies on your brake lights actually working - eg the switch works/trips. Also, you need for the CC "brain" to "see" a decent current. Or ground, I forget. So may not work if you replace the brake lights with LED (in this case, some use a relay to trip the "bulb" and connect the cruise to see the ground on the control side).

Depressing the clutch - eg to change gear - temporarily "pauses" the CC, but it resumes when you let the clutch engage again. But yeh, I can see how that would be bad if you selected neutral...

The microswitch that the clutch pedal operates on (so the CC "knows" the clutch pedal is down) is in the tunnel to the right of the gas pedal. Pictures in this thread cruise control

Shoulds like yours has an issue of some kind.