Cruise control quest...

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davetherave
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Cruise control quest...

Post by davetherave »

I know this has been covered a few times, but was wondering if anyone had a deffinitive answer as to whether cruise control using original parts could be fitted to a 1.9td Mk 2 (manual) xantia?
Figured it will save me alot of foot cramp on the way to france!
Thought it would be useful to know before i start getting parts!
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Post by Peter.N. »

Don't know to much about the development of Xantias but the 2.1 diesel XM's had purely mechanical fuel injection until '96 which won't support cruise, if yours has an EPIC pump or some other sort of electronic control, it might well, but it needs someone more knowledgable than me to give you a definite answer. ....Jim?
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Post by RichardW »

I'm pretty sure the 1.9TD uses a fully manual throttle - whilst there is an ECU it only controls ignition advance and fast idle for 'smooth' running and emissions control. On Mk2s there is an electronic speedo output, and a vac pump to run the fast idle and EGR, and it should therefore not be beyond the wit of man to fit up cruise control using a vac servo and some sort of controller. Would be a lot of work though :cry:
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Post by KP »

You'd be better getting one of those off the shelf types and fitting it yourself as I've never seen a 1.9td with Cruise to be honest.

Seen 1 2.1td with it on the bay moons ago but mostly V6 and 2.0litre exclusives.
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Post by CitroJim »

The vacuum operated mechanical arrangement as found on the V6 for instance is pretty much stand-alone and I see no real reason why it could not be fitted to another vehicle with a mechanical throttle. How well it would work is another matter.

Although the later EPIC 2.1TD is "fly by wire" there's still a throttle cable that operates a pot so a mechanical/vacuum cruise could still be fitted.

All it does, effectively, is pull on the throttle cable.
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Post by citroenxm »

OH Yes a very crude, simple but VERY effectivly cheap way of fitting cruise!

Its a circuit of its own albiet taped into the exisiting harness, but early 2.1td's with mechanical injection had cruise and its a Vaccum diaphram that simply pulls on the throttle!!

This setup is Jim says is on the PRV 12v Autos and 2.oi Turbos (XM's this is!) and also on the first S2 2.1 Td EXCLUSIVEs from 1994 with mechanical pump, theres a Club XM member whos exclusive 2.1 has it AS standard.. so theres absolutly NO NEED for this Epic rubbish (Sorry EPIC die hards) to be fitted for cruise to work..

So.. Go on then davetherave, beat me to it and get it fitted!! Ive a complete system removed from a V6 to fit to a mechanical DERV, either an EARLY XM or a Xantia and see how well it performs!

Rgds
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Post by Peter.N. »

Didn't know about this mechanical thing :oops: where does it get the vacuum from?
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Post by DickieG »

One issue with fitting this is that I take it your TD has a manual gearbox? If so then you'll have to fabricate your own brake and clutch switches as Citroën only fitted cruise to 2.0 and 3.0 auto's which have the wider brake pedal within which are two switches, one for the brake lights the other for the cruise control, so no easy resolution to that issue.

Before going any further with this I'd contact your insurance company as they usually take a very dim view of aftermarket cruise control fitment.
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Post by davetherave »

Having looked into it, there is a seperate vaccum pump locate somewhere in the battery kind of area!
Just got to find a car to rip the cruise control off, also the posts i read suggested i would need to put a microswitch under the brake and clutch pedal.

Good idea with the insurance...
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Post by DickieG »

davetherave wrote:Having looked into it, there is a seperate vaccum pump locate somewhere in the battery kind of area!
The pump is located on the end of the camshaft, you'll see a vacuum hose running to the two relays mounted on the bulkhead close to the LHM tank.
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Post by citroenxm »

Peter.N. wrote:Didn't know about this mechanical thing :oops: where does it get the vacuum from?
Peter!

The vaccum pump is located in the passenger wing behind the inner arch plastic liner - forward of the window screen washer bottle!!

Im suprised you've not come across them mind you with having just VSX spec, I guess you wouldn't have..

All else,

Who in the right mind would engage Cruise in any other gear then TOP? If yur a sensible driver and not an idot then I think just a brake pedal switch would be needed.. And on that note you can piggy back the connection to the brake light circuit Im sure!

Rgds
PAul

PS: Citroen also put cruise on the 2.5 TD Manuals XM's!
Sharing a pug 207 1.6 hdi Sw 16v.
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Post by davetherave »

All usefull info cheers!, just need to make a list of the location of all the parts, when i go to get them- i think i might have found a possible donor!
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Post by jgra1 »

Dave, for £25 I fitted a rudimentary cruise unit to my xantia TD

It has one main drawback, it doesnt change the speed.. so throttle for 70 on the flat stays locked, and you do 80 downhill and 60 up.. it is useful for giving your leg a break anytime, for a few mins... on a quiet road its perfectly fine.

Fitting took 30 mins.. basically its a small unit I have screw under steering column.. there is a lever to engaged it, (it then locks the injection pump cable) and there is a knob to fine tune it..

It has an on off button, and also is wired to the brake switch (when there is power through the switch CC shuts off)

thats it, a cable routes out through bulkhead, and all is done :)

its cheap and it works, but best on lonely long stretches of road, or for short time use..

used it on route to France last Sun, for about 15 mins on an average M20

Can get pics if needed
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Post by DickieG »

citroenxm wrote:Who in the right mind would engage Cruise in any other gear then TOP? If yur a sensible driver and not an idot then I think just a brake pedal switch would be needed.. And on that note you can piggy back the connection to the brake light circuit Im sure!
The clutch pedal switch is for in the event of depressing the clutch without having first disengaged the cruise to avoid the engine racing at excessive speed.

It might sound unnecessary but there is no accounting for what people do when behind the wheel of a car, particularly if put under any form of pressure!!

Hmm, not sure about the piggy back method on the brake lights as you'll have the cruise ecu potentially running in series with the brake lights, if Citroën feel the need for a second switch I presume there must be a reason for it.
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2010 Peugeot 207 SW 1.6 8v HDi 161k and rising
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Post by citroenxm »

Yes I guess pressure could cause any sort of problems unexpected.. :oops:


P
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
1994 XM 2.1 d auto
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