Technical Rear disc conversion

[custard]

think the handbrake as to be totally seperate from the braking system doesnt it?
so would need its own seperate hydraulic system.cant see a problem as long as that was the case

 

[TurboCinqy1250]

But are the rear calipers from the barchetta the same as the punto GT rears?

Uno T is a straight swap and the punto GT only needs some custom mounting plates.

And the othe question was: Do I need to change the handbrake lines?

The scrapyard doesn't have GT's but the do have Barchetta's and de front are the same, so why not the rears?

 

[rallycinq]

MIght sound silly D, but whats stopping us from having hydro handbrakes?

Assuming the system has its own fluid circuit, doesnt drive the calipers (eg: drives a spot caliper or similar) and has a ratcheting mechanism?

Yes, but no. The OP was asking about using Barchetta calipers, which have the provision for a cable operated handbrake. His posts suggest he is wanting to use standard parts without putting on a separate handbrake caliper so the only way to do that is to have the hydraulic handbrake working through the main foot brake system using the same fluid. Hence my suggestion.

Cheers

D

 

[Asteris]

But are the rear calipers from the barchetta the same as the punto GT rears?

The scrapyard doesn't have GT's but the do have Barchetta's and de front are the same, so why not the rears?

Barchetta 95-99 same as GT 93-97, Barchetta 99- same as GT 98-99. Disks also the same, 240mm diameter, 40mm fat, like cento fronts.

Need the custom plates too, as with the GT ones.

 

[TurboCinqy1250]

Barchetta 95-99 same as GT 93-97, Barchetta 99- same as GT 98-99. Disks also the same, 240mm diameter, 40mm fat, like cento fronts.

Need the custom plates too, as with the GT ones.

That was the answer I was hoping for.

Thanks

 

[TurboCinqy1250]

@ Asteris:

Do you have the autocad drawing of the custom plates?
Otherwise I should redraw it by my self in a 3d programm and convert it tot 2d CAD

I use solidworks 2006 at the moment for the drawings.
A few days ago I get this back from a company that does plasma cutting.

Only they weren't able to cut the screwholes in it.
This are my new turboplates and exhaustmanifold.

 

[J333EVO]

I completed my rear Uno Turbo disc conversion at weekend, will try and gets pics up of them done & with all parts needed as I have another full set of parts to be fitted to another Cinq, with some info on how i did it, all in all its pretty easy.

The hardest part is removing the old flexi pipes as I wanted s/s goodridge lines on mine as they are a up next to the fuel tank, tho to get access i just loosened the fuel tank bolts and let it drop down 50mm or so to gain access easier.

My car now has Punto GT fronts 257mm vented discs and UT rears 227mm solid discs, and yes the handbrake feels like a normal car now

Aaron.

 

[StoneNewt]

I must get the stoppers upto spec on my Sei, I'm looking at 274mm discs front and 240mm rear... what's stopped me so far is that I want tar.ox calipers and that seems to be a problem for the rear (though I'll admit to not searching too hard up until now)

 

[Asteris]

@ Asteris:

Do you have the autocad drawing of the custom plates?
Otherwise I should redraw it by my self in a 3d programm and convert it tot 2d CAD

I use solidworks 2006 at the moment for the drawings.
A few days ago I get this back from a company that does plasma cutting.


Only they weren't able to cut the screwholes in it.
This are my new turboplates and exhaustmanifold.

Will search for it when i am back at home and send it to you.

For whoever needs a ready made set, my mechanic has some modified sets left (for the 240mm disk). Price is 25£ + shipping, send PM for more...

 

[mase]

I must get the stoppers upto spec on my Sei, I'm looking at 274mm discs front and 240mm rear... what's stopped me so far is that I want tar.ox calipers and that seems to be a problem for the rear (though I'll admit to not searching too hard up until now)

IMO mate id call that overkill..... you should try an get a drive of a cento with 257 front discs, ive got drilled + grooved ones and fast road pads, and sure as hell wouldnt want them with anymore bits, its way too easy to lock the brakes in the wet as it is... and im still on standard drums.

when u think the GT discs are designed for a car weighing twice as much and with 3 times, maybe even 4 times the power when compared to a cento, they do the job pretty damm well

 

[StoneNewt]

Overkill is good .. seriously though I've driven a GT braked cinqu and maybe it was a bad setup but while it had great performance at first it seemed to struggle a bit after a while. As for rear discs I wouldn't want to get much more retardation but would like more control, drums seem to have a nasty habit of locking up mid-corner.

 

[TurboCinqy1250]

Is there anyone with some nice pics of a 240mm reardisc conversion?

 

[Asteris]

Is there anyone with some nice pics of a 240mm reardisc conversion?

Looks just like the original cento fronts. Get a side picture of your cento in a photoshop, copy the front wheel and paste it at the back and voila...

 

[nogin]

waste of time in my opinion, money could be spent else were for beeter performance, unless you have a manual brake bias valve you wont get much if anything out of a rear disc setup on a chinq, as its too light and will lock up easy, plus 75% of braking is taken up by the front brakes

if you got the money or use it for track days but for road its just overkill

 

[StoneNewt]

I'd disagree if anything you get less lockup with discs... I've driven a GT braked Cinq and it was so much sweeter on the brakes mid-corner than a drummed Cinq..

 

[nogin]

before you disagree read the post fully and understand what i have said

 

[StoneNewt]

I understand what you've said but I flat disagree! Having progressive braking to lockup at the rear even on the road is a bonus. Ever had to slam the brakes on going round a roundabout cause some idiot pulls out without enough space? Better braking progression at the rear helps you out in that situation.

 

[nogin]

locking your car up at the rear is in no way a bonus, or at the front, as soon as you lock a wheel up you loose control, so if you lock your front wheels up and your back ones what you going to do other then slide into them, chinqs dont need disks at rear they are way too light

 

[rallycinq]

I'd disagree if anything you get less lockup with discs... I've driven a GT braked Cinq and it was so much sweeter on the brakes mid-corner than a drummed Cinq..

What on earth are you doing braking mid corner!!

Cheers

D

 

[StoneNewt]

While cornering drums get grabby and lock up easily, discs are less prone to this. As long as the bias remains in the right area, a manually adjustable bias valve isn't necessary and balance can be done with a front disc upgrade, it helps to maintain car stability during cornering under braking.

The particular Cinq I was talking about has Punto GT brakes front and rear and it was far harder to lock the rears up while cornering even though it was easier in a straight line compared to a stock brakes cinq.

What on earth are you doing braking mid corner!!

It's faster to brake round the first corner into the mouth of the tighter corner following than get down to speed before the first corner.