track day activa

davoxx · Unread post by **davoxx** » 13 May 2011, 11:37

Koukku wrote: I've heard that rumour too... has anyone ever tested this? If it is true, the seals need to be replaced with something LHM proof. By replacing the front calibers you would of course lose the handbrake, but 406 has rear calibers with handbrake... (dunno if they're bolt on though)

I'm going to try with a set of old callipers and some lhm and see what happens ... i'll report back

addo · Unread post by **addo** » 13 May 2011, 11:51

Caliper piston seals are ID'd like sphere seals from my observation of a few kits. Red stripe on the side means brake fluid, green stripe means LHM, both means both.

Using LHM in a DOT4 caliper will swell the piston seal, making it extremely hard to dismantle and rebuild. I'd hazard a guess that many calipers use the same seal cross-section, so it's simply a matter of tracking down a rebuild kit in the correct bore and fluid type.

As to the rear handbrake, there are plenty of ways to approximate a result, including adapting a 405 type cable setup - whether with internal drums in the rotors like a 406 or externally levered calipers like a 405 rear/Xantia front. The main issue with the cable, is that at its splitting point where two independant cables take off, the cables run east-west.

davoxx · Unread post by **davoxx** » 13 May 2011, 11:59

addo wrote:Caliper piston seals are ID'd like sphere seals from my observation of a few kits. Red stripe on the side means brake fluid, green stripe means LHM, both means both.

Using LHM in a DOT4 caliper will swell the piston seal, making it extremely hard to dismantle and rebuild. I'd hazard a guess that many calipers use the same seal cross-section, so it's simply a matter of tracking down a rebuild kit in the correct bore and fluid type.

As to the rear handbrake, there are plenty of ways to approximate a result, including adapting a 405 type cable setup - whether with internal drums in the rotors like a 406 or externally levered calipers like a 405 rear/Xantia front. The main issue with the cable, is that at its splitting point where two independant cables take off, the cables run east-west.

so i could just change the seals with a seals kit? that makes more sense.

back to the lsd, how much effort would it be to use the lsd from a ML6? I think i can't just change the whole assemble from gearbox to drive shafts as they are of different lengths ... so i'd need to get drive shafts made up ... any ideas for the lotto numbers tonight?

addo · Unread post by **addo** » 13 May 2011, 12:43

Yes, provided the seal cross-section is the same just obtain the seal kits to suit LHM. If you need flex hoses, get Goodridge or similar Teflon lined units to avoid any DOT4 type hoses.

Koukku · Unread post by **Koukku** » 19 May 2011, 14:35

addo wrote: As to the rear handbrake, there are plenty of ways to approximate a result, including adapting a 405 type cable setup - whether with internal drums in the rotors like a 406 or externally levered calipers like a 405 rear/Xantia front. The main issue with the cable, is that at its splitting point where two independant cables take off, the cables run east-west.

I thought 406 rear calibers had a handbrake lever...

405 rear caliber doesn't look like an easy fit, but how about 405 4x4's rear calibers? It has the same rear axle as BX 4x4...

KP · Unread post by KP » 19 May 2011, 22:54

It would be easier to find a golden egg laying goose holding a needle in it's beak onto of a pile of rocking horse poo than those rear brake caliper units... What's wrong with just putting standard fronts of say a 1.6 Xantia on the back and then front units from say a 2.5 xm estate or c6 as they would surely be bigger and more capable units before going onto some nice brembo 4pots if you could get the seals???

davoxx · Unread post by **davoxx** » 20 May 2011, 09:42

KP wrote:It would be easier to find a golden egg laying goose holding a needle in it's beak onto of a pile of rocking horse poo than those rear brake caliper units... What's wrong with just putting standard fronts of say a 1.6 Xantia on the back and then front units from say a 2.5 xm estate or c6 as they would surely be bigger and more capable units before going onto some nice brembo 4pots if you could get the seals???

would the cx brakes (which i are 4pot at the front) not fit an xantia?

KP · Unread post by KP » 20 May 2011, 11:02

If you can get new seals for them im sure an adapter plate could be made up. You would be better going for Brembo 4 pot units from another car as they are very widely used and so pads for all different uses are easy to find and much cheaper than lots of other combos

Koukku · Unread post by **Koukku** » 20 May 2011, 11:10

KP wrote:It would be easier to find a golden egg laying goose holding a needle in it's beak onto of a pile of rocking horse poo than those rear brake caliper units... What's wrong with just putting standard fronts of say a 1.6 Xantia on the back and then front units from say a 2.5 xm estate or c6 as they would surely be bigger and more capable units before going onto some nice brembo 4pots if you could get the seals???

Hehe... you're probably right about the 4x4 calibers

The largest front brakes fitted on the XM are the same as used on Xantia V6. C6 has "traditional" brake system, separate from the suspension (just like C5), and uses regular brake fluid. And they probably wouldn't be a bolt on fit, unlike the Brembos from a 406. The seals are still an unsolved problem of course.

Using 1.6 Xantia (or BX) front calibers in the back is an interesting idea. Front discs are much thicker than rears though, dunno how that would work.

Edit: Some BX models had 10mm thick (non-vented) front discs, so those calipers might be quite usable in the rear

Unread post by **Dommo** » 20 May 2011, 13:27

What size are Xantia V6 brakes? My old Activa brakes are 288mm, and are spare

Koukku · Unread post by **Koukku** » 22 May 2011, 19:24

Dommo wrote:What size are Xantia V6 brakes? My old Activa brakes are 288mm, and are spare

288mm

I think all S2 TCT's and HDi's had those.

davoxx · Unread post by **davoxx** » 18 Jun 2011, 16:25

what type of gauges would be cool for an activa?

i'm going to stick a boost gauge and was wondering if i should stick in an oil pressure one?

i know you can have oil temp, water temp, battery voltage, fuel ratio .... there are so many!!!

and where on the dash would be a good place? i don't want to damage the dash board, as i might want to make the car look stock again, so i was thinking of the drivers pillar.

any ideas?

Citroening · Unread post by **Citroening** » 18 Jun 2011, 16:31

They're not the cheapest, but I do like the look of these type of gauges. Link.

This looks interesting for the Radio slot too - Link.

davoxx · Unread post by **davoxx** » 18 Jun 2011, 16:53

Citroening wrote:They're not the cheapest, but I do like the look of these type of gauges. Link.

This looks interesting for the Radio slot too - Link.

i wanted to keep the radio/mp3 player . i need tunes!!!
how would i go about adding a oil pressure sender, or should i use the stock one?

Deanxm · Unread post by **Deanxm** » 18 Jun 2011, 17:29

I wouldnt worry about oil pressure really, a boost guage is only needed for the initial setup too unless you have an in car boost controller but even then once its set thats it, i have a throttle to regulate boost

If it were me i would have an EGT guage, boost guage, and oil temperature, the later is standard fitment anyway.

CIMG3174 by Deanxm, on Flickr

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