adjustable rearaxle

[peter holst]

I have been told that the alfa 155 BTCC had an fully adjustable rear axle. has anybody godt some pictures etc? I think it must be the same axle as on the Q4?


A guy at the fiat coupe forum has this for sale:
I also have a set of machined rear arms which give -3 degrees negative camber and it is what i used on my race car more or less all of it's life as i didn't get a chance to get the benefit of theis one. They don;t adjust obviously and i will sell them as they are or mounted onto a refurbed rear beam for £200 posted.

anybody who knows if the 155 GTA had negative camber on the rear wheels?

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[Steve Webb]

I'm imagine the BTCC 155 had an adjustable rear end, but whether this was done with a truly adjustable rear frame and arms, or whether it was done by having differently machined rear arms I don't know. The latter I would guess.

The trailing arm design of the rear suspension doesn't really lend itself to an adjustable setup as the geometry would change as the suspension went through compression and droop.

[hf hpe]

155 GTA use different rear suspension
I think it is from Delta or Alfa 164

Sordi's 155 GTA
http://forum.berlinasportivo.com/showthread.php?t=2238

[Steve Webb]

That suspension looks completely bespoke to me, too complicated and fragile for a road car I would have said.

[hf hpe]

there is rear suspension 155 GTA stradale
http://www.flickr.com/photos/alfaromeo155/4270343310/

[peter holst]

but what about the camber on the gta?

is it negative and how much?

[Q4-Dave]

Don´t know anything about the rear camber I´m afraid

What I recall the BTCC cars was frontwheel drive with the 2,0TS engine? If my memory doesn´t fail me
if so they should not have the same rear axle as the Q4, as they were frontwheeldrive and the Q4 4wd, but correct me if I´m wrong..?

[Steve Webb]

The BTCC rear setup won't be exactly the same as the Q4, as the Q4 rear subframe needs to clear the prop-shaft and have somewhere to bolt the rear diff to. However I believe the rear suspension arms and spring\damper location points are pretty much the same across the whole 155 range.
Keeping the standard 155 rear suspension configuration and making it adjustable for camber is going to take some pretty trick engineering. More likely that if the BTCC cars had adjustable rear suspension, it was done with a selection of different suspension arms.

[peter holst]

A guy at the coupeforum had one and also a set of suspension arms - sold:(

[Q4-Dave]

Ok i see, thanks Steve for clearing things out for me..

Have been thinking of the "rear wheel adjustment thing" as well but not come up with anything yet..

peter too bad they were sold already, do you know where to, lancia or alfaowner?
what was he asking for them?

[corriedw]

On a 2wd track day 145, which has the same rear suspension as the 155, we slotted the mounting for the trailing arms, for camber and toe. In this case the angle will stay the same through the movement range compared to the car's center line. Large washer were fitted on the bolts holding the mounting and when satisfied with the settings measurement the washers were welded in position.

The angle to the road however change as the car lean in a corner, unlike the 147/Integrale style rear suspension. Which was copied in the stradale suspension above. I can not clearly see if the first GTA suspension is the the same type, strut suspension or a double wishbone set-up.

I did not give enough attention to the standard Q4 set-up(not ready to start changing that yet), but if I remember correctly it is standard 155 trailing arms with hubs to connect the drive shaft. Meaning you should be able to slot the trailing arm mountings if you want to change the camber.

I must say that with experience on other vehicles, I found that tyres does not run off even with more than 1 degree camber. On cars prepared for the track 3 deg are the norm, but tyre life is not applicable here.

The multi-link suspension on the 916 GTVs are set for 1.75 deg negative, with 2.5 mm toe-in. Even with harder coil springs or stiffer shocks the tyres wear down unevenly. The settings on this complicated suspension is extreme and can not be used for a road car with trailing arm rear suspension.

[peter holst]

Ok i see, thanks Steve for clearing things out for me..

Have been thinking of the "rear wheel adjustment thing" as well but not come up with anything yet..

peter too bad they were sold already, do you know where to, lancia or alfaowner?
what was he asking for them?

don´t know to who but the price was 200 pounds

[peter holst]

the Q4 rear subframe needs to clear the prop-shaft and have somewhere to bolt the rear diff to as steve says - is it possible to mod the GTV subframe for this?

[corriedw]

the Q4 rear subframe needs to clear the prop-shaft and have somewhere to bolt the rear diff to as steve says - is it possible to mod the GTV subframe for this?

It may very well be possible. I do not think it is a good idea as the GTV rear suspension need to be dragged to bring the castor/toe in limits. I believe you will not have the same dynamics if the rear wheel is driven.

The subject is not on topic here, If somebody need to know more, I will try to explain my view, of some of action on the GTV multi link suspension.

[Tony]

There is a guy called serge who has a GTV rear-axle fitted on his fwd 155 track-car!

in these pictures it is not fitted yet, but i heard he did:
http://www.scuderia-hscorse.nl/index.php/news-events/item/37-alfa-155-evo-stage3-van-serge-van-os

its in dutch :S

http://www.artc155.nl/phpbb/viewtopic.php?f=76&t=21954

[peter holst]

I bought an adjustable rearaxle from a Fiat coupe guy. It has been specialmade and fits the roadcar. Need to modifi the mid- sektion to fit the q4

[colibry]

pics!!

[peter holst]

I will try to find the link to the Fiat coupe uk HomePage. If you can't wait it is listed under "parts for sale"

[Evodelta]

Can you take some pictures and post them up?

[peter holst]

I will as soon as I can get into the garage - not much to see :)

[peter holst]

It is adjustable for camber and to in