Cruise Control Retrofitting
- Thread starter 944Fripp
- Start date
944Fripp
PCGB Member
Hi Fatboy,
Well I got it all up and running! It's a bit problematic but it definitely works and is very good at maintaining the speed when it's working. It's also weird because the engine is essentially controlled by the throttle pedal, you can feel the pedal moving as it adjusts the speed!
I think the ECU needs some soldering work doing or connections re-melting as it doesn't actually work unless the cabin is warm (!!!). The other problem is that I think the tempostat needs cleaning as it accelerates about 10-15 mph when you engage it so I have to roughly predict what speed you want to be going!! [
] I've actually just purchased another tempostat that was going cheap on e-bay to replace it as I have tried cleaning mine once before and it didn't work.
I always meant to post more pictures of the final set up, just never got round to doing it.
I had to purchase another part from Porsche (after the last post) which was the accelerator pedal bar - this had an extra pin mounted on it for the cruise control cable (part number 945 423 034 00 and is the M454 variant). If you can get a kit of parts from a RHD car rather than a LHD, it'll save you a wodge!
I'll take some pictures this weekend if I can and post them up.
Happy to help if you want to go for it though!
Well I got it all up and running! It's a bit problematic but it definitely works and is very good at maintaining the speed when it's working. It's also weird because the engine is essentially controlled by the throttle pedal, you can feel the pedal moving as it adjusts the speed!
I think the ECU needs some soldering work doing or connections re-melting as it doesn't actually work unless the cabin is warm (!!!). The other problem is that I think the tempostat needs cleaning as it accelerates about 10-15 mph when you engage it so I have to roughly predict what speed you want to be going!! [
] I've actually just purchased another tempostat that was going cheap on e-bay to replace it as I have tried cleaning mine once before and it didn't work.I always meant to post more pictures of the final set up, just never got round to doing it.
I had to purchase another part from Porsche (after the last post) which was the accelerator pedal bar - this had an extra pin mounted on it for the cruise control cable (part number 945 423 034 00 and is the M454 variant). If you can get a kit of parts from a RHD car rather than a LHD, it'll save you a wodge!
I'll take some pictures this weekend if I can and post them up.
Happy to help if you want to go for it though!
I would certainly be interested to hear more about it - I have a kit of parts for my S2 (not sure if they are all there), but have fought shy of fitting it after previous experiences with an early dash car... did you have to cobble together any bracketry or drill holes, or was it purely a bolt-up job in the end?
Hi Fripp,
Thanks for the reply - good to hear you got it running- looking around I might have to go for an LHD kit from the States, don't seem to have been common over here, but I will try most of the breakers I can think of - I'm just finishing off replacing the sills from rust - big job, but now I'm almost over that I'm back to thinking about improvements
Silly Question, but what's the tempostat?
Is the pedal different for LHD and RHD?
Cheers!
Thanks for the reply - good to hear you got it running- looking around I might have to go for an LHD kit from the States, don't seem to have been common over here, but I will try most of the breakers I can think of - I'm just finishing off replacing the sills from rust - big job, but now I'm almost over that I'm back to thinking about improvements
Silly Question, but what's the tempostat?
Is the pedal different for LHD and RHD?
Cheers!
944Fripp
PCGB Member
ORIGINAL: Fatboy
Hi Fripp,
Thanks for the reply - good to hear you got it running- looking around I might have to go for an LHD kit from the States, don't seem to have been common over here, but I will try most of the breakers I can think of - I'm just finishing off replacing the sills from rust - big job, but now I'm almost over that I'm back to thinking about improvements
Silly Question, but what's the tempostat?
Is the pedal different for LHD and RHD?
Cheers!
No worries.
The tempostat is the third picture down on my first post in this thread. You're right, all the parts that you need are commonly from the states, very few people opted for them in the UK. The plastic pedal which hinges from the floorpan is the same but the bar that attaches behind it and pivots off a bracket in the foot well is different. For a RHD car you'll need the pedal bar, the clutch switch (it's a plunger switch for a LHD) and a RHD cable to convert the kit of parts.
I used the parts catalog as a reference for where things go.
It's a pretty good system when it's all up and running.
No drilling or fettling, just bolt on really. Once you locate where everything goes it's all pretty logical. I did have to make some adjustments to the angle of the bend on the RHD pedal bar as being a new part it clearly didn't take account of the wear to the plastic pedal already on the car. This was done with the delicate and accurate application of a significant force from a universal screwdriver tool. [
]You'll have to dislocate your wrist several times to hook up the pedal assembly. Best to remove the steering wheel for this part which you'll need to do anyway to hook up the stalk module. [
]Brilliant, thanks, I'll have to drag my box of bits out and have another look at that! I must admit I miss that weird sensation! Have you found it does anything (either way) for fuel consumption? The car I had it on I didn't at the time use enough to be able to judge, theoretically I suspect it should be better, but when it does need to compensate I found that it applied the throttle hard - do you find the same?
944Fripp
PCGB Member
I never noticed if it made it a more efficient drive, probably didn't do enough miles with it on given that I had to predict the speed I wanted and if I got it wrong I had to drop my speed by another 10mph again to set it again! I bought an oil burner not long after I installed the CC system so never got to the point where I could judge. I always thought that in theory, a cruise control system would make a car less fuel efficient because you would get less engine braking but I have to admit that I've always been really impressed by how subtle the system is at keeping the speed, for a 24 year old system, it's actually pretty slick!
The weird bit comes when you re-engage the system having cancelled it and dropped to a lower speed.....push the button feel the pedal drop away from your foot into the carpet and hope to god the it stops accelerating when it gets to the last speed set! [
]
944Fripp
PCGB Member
Right, I managed to get into the footwell last night and get some images. I also managed to dig up some other pics I took at the time.
The Tempostat and ECU are pretty easy to bolt in. The stalk module takes some digging around to find the connector but it's pretty obvious when you find it.
The only other part is the pedal control.
I managed to find this picture I took of the two pedal bars before I installed mine.
The top one is new one, the bottom one is the old non CC one.
You'll see the only difference is the lug that is welled in place....not really worth the money in hindsight so I took some dimensions if any of you can do the cutting and welding yourselves!
PLEASE NOTE: DIMS ARE IN MM. I CAN'T GUARANTEE THESE DIMENSIONS ARE ACCURATE, THEY WERE VERY ROUGHLY SKETCHED AT THE TIME!!
This image shows the kit of parts, the green circled bit is the controller bar for the CC system.
This has a white roller on it that rolls on the outer face of the lug. As you push on the pedal, it pivots on the main bar through the pedal bar against the bracket, when the CC system is activated, the tempostat pulls this actuator bar against the lug and controlls the pedal that way.
This is how it looks when it is all installed in the foot well (sorry about the picture quality!). The green circle is the CC cable to the tempostat, red circle is the accelerator cable:
Hope that helps.
My 2nd hand tempostat arrived from the states yesterday so I'll be fitting it this weekend...hopefully I won't have to keep guessing at the speed I'll be traveling at any more!! []
The Tempostat and ECU are pretty easy to bolt in. The stalk module takes some digging around to find the connector but it's pretty obvious when you find it.
The only other part is the pedal control.
I managed to find this picture I took of the two pedal bars before I installed mine.
The top one is new one, the bottom one is the old non CC one.
You'll see the only difference is the lug that is welled in place....not really worth the money in hindsight so I took some dimensions if any of you can do the cutting and welding yourselves!
PLEASE NOTE: DIMS ARE IN MM. I CAN'T GUARANTEE THESE DIMENSIONS ARE ACCURATE, THEY WERE VERY ROUGHLY SKETCHED AT THE TIME!!
This image shows the kit of parts, the green circled bit is the controller bar for the CC system.
This has a white roller on it that rolls on the outer face of the lug. As you push on the pedal, it pivots on the main bar through the pedal bar against the bracket, when the CC system is activated, the tempostat pulls this actuator bar against the lug and controlls the pedal that way.
This is how it looks when it is all installed in the foot well (sorry about the picture quality!). The green circle is the CC cable to the tempostat, red circle is the accelerator cable:
Hope that helps.
My 2nd hand tempostat arrived from the states yesterday so I'll be fitting it this weekend...hopefully I won't have to keep guessing at the speed I'll be traveling at any more!! [
]
chrisg
Member
Hi there !
I've only just got around to reading this thread - very interesting to see what you've done and how you've acheived it all, well done you ! Not sure I'd have gone to so much bother myself.
I've seen underbonnet pictures of 944's with CC - I always assumed that the tempostat cable ran directly to the throttle body not the pedal itself. Sort of makes sense though when you think about it - guess most of the photos I've seen were LHD cars so the cable went across to the pedals on the other side of the car.
Chris
I've only just got around to reading this thread - very interesting to see what you've done and how you've acheived it all, well done you ! Not sure I'd have gone to so much bother myself.
I've seen underbonnet pictures of 944's with CC - I always assumed that the tempostat cable ran directly to the throttle body not the pedal itself. Sort of makes sense though when you think about it - guess most of the photos I've seen were LHD cars so the cable went across to the pedals on the other side of the car.
Chris
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