sway anti roll bar front and rear 155Q4

[na15575]

hi i open this thread because i have sent my front antiroll bar to pedders .
now he has the copy...
if anyone wants one i thing that he can mail
http://www.pedders.com.au/storeFinder/1/store27

i make 24mm rear (oem 19mm so +5mm)
28mm front (oem 23mm +5mm)
im waiting the front 28mm bar now

[na15575]

i want to thank Jim who showed us the way

thank you Jim :smile:

[RMB-Racing]

Nice!

My own Q4 project is a quite slow at the time - but when I get the time again - i will definitely have these uprated anti rollbars.

Nice work all of you!

[jimnielsen]

what would be interesting is a full report on how the 28mm front bar performs. I hate body roll, and have installed the same rear 24mm bar that is being referred to here. In my opinion, the body roll control of the rear bar alone (using the std front bar) is sufficient. However, I am using 650 lb/inch springs on the front and 550 lbs/inch spring on the rear. These also have an effect on controlling roll. The KEY limiting factor in how fast these cars will lap any track is the amount of understeer that is developed in corners where the speed of the car is forced to drop below 65kmh - typically on 2nd gear corners with a bend angle of more than 90 degrees. Typically understeer on these corners strictly limits the speed of getting back onto the throttle. Thus, any increase in understeer with result in higher lap times. I have found that using VERY stiff springs in the rear of my Q4 can assist in reducing understeer as it is easier to get the back of the car to slide a little in these slow corners (even using slicks).

Well done on getting us another option for the front bar NA15575, it will be great to get a report in the future about how it works.

cheers, jim.

[na15575]

jim i have under steer with my car on the track (and roll )
i have it with oem springs and hand made absorbers
i still have it with the rear antiroll of 24mm
i still have under steer with the XYZ coilover but not the roll
i thing that the under steer is from the body-roll all the weight goes to one front tyre (outer in the corner)
the last set up is a setup with hard springs that they control the roll of the body
but i still have understeer on the track and nothing from comfort on the road
now i want to test a different setup
strong antiroll bars to control the body roll and the normal springs with good hard absorbers i belive that this is a way to reduse understeer and roll and always have 2 front wheels in contact with the track and of course comfort on the road

your experience is bigger than mine if you want,and if you have time , the 28mm front antiroll bar is ready and near to you .
you can get it and test it in your car after that you send it back to me
i thing that the only one that can tell us if the antirolls is good or not is you
so go for it if you want

thanks Nick

[markgq4]

sometime ago i asked about this problem to evo engineering and he suggested 2.5 deg negative camber on the front susp will improve massively the cars proneness to understeer, which makes sense as i always found on my car on track, it would destroy outer edge off outside tyre and inner edge off inside tyre and rest of the tread pattern was untouched !
and also if you look at the GTA racecar it is very much set up on neg camber on all corners.




disclaimer: i have not got around to doing this "mod" yet, so cannot vouch for the accuracy of above statement(s) ! :p

[Q4Jan]

I have max. negative camber with the D2 setup. And my tire wear is even spread on the front tires.

Were as before the outside would go long before the inside of the tires.

[jimnielsen]

I am using 4.5 degrees neg camber on the front and tyre wear is reasonably even. I still get more wear on the outside edge than the inside however. The harder you push the car the more you see this. I think 4.5 degrees is about ideal for a 'track only' car, but this would be far too much for a street car.

jim.

[mindus]

Jim, how about breaking with this much of neg camber? Also, do you have a chance to measure the temperature of the tire - when the temperature spreads evenly from one side of the tire to another, then you have the best set up for that particular track and can do fastest laps... Also have you tried a toe out (or negative toe) - that is racing set up but helps to drive through corners faster (though difficult to drive the car on straight line).

Well, suspension setups is the whole new since for me, lots to know, but will try all this stuff when put my car on track hopefully soon...

[geniusmiki]

i need front and rear bar too...
pedders, not responds to me.
there is a group buy??

[na15575]

tray to e-mail him
bendigo@pedders.com.au

no there isn't a group buy i have sent him a spare oem sway bar to make me one bigger
i believe that he must have the copy of mine

[jimnielsen]

If pedders in bendigo wont communicate, I can go and see them if needed..

cheers, jim.

[peter holst]

I have been in contact with them but it took some time...

[na15575]

If pedders in bendigo wont communicate, I can go and see them if needed..

cheers, jim.

Jim if you go from there
just tell them to keep a copy of the sway bars
in case that someone needs one
i see that there is interest on that :smile:

[geniusmiki]

any news?

[peter holst]

mine is on its way to denmark

[geniusmiki]

front and rear?
from pedders?

[peter holst]

front this time. got the rear from earlier

[geniusmiki]

Guys,
Pedders answare to me.
They want 923 AUD = 650 euro about
for front and rear with shipement.

is this a good price??

[AlfaJack]

Sounds expensive for what they are but given it is the only price and the only place that are making them in one off orders, it probably is not too bad if you really want them :)

[Jan]

is this with uniballs or poluthurane bushes or what?

[geniusmiki]

Sounds expensive for what they are but given it is the only price and the only place that are making them in one off orders, it probably is not too bad if you really want them :)

maybe we can do a group buy...

[Q4-Dave]

I?m in if there are a GroupBuy :D

regards
David

[RMB-Racing]

Count me in for a group buy!

[peter holst]

I have got mine. remember that it cost 125 euro to import it to europe

[Stichl]

Hello,
can someone tell me about the experiences, done with the thicker swaybars?!
I intend to install stronger ones in my car. Before I do so I would like to know if this invest (to order the 28mm /24mm version from Australia) is worth it?!
My car is no race car, but "sportive weekend streetcar", only.
I found a front arb from an Dedra Integrale, which I could install.
Additionally I thought to order the 24mm rear arb from Australia, to combine it with the 24mm Dedra front arb.
Is this a good combination or could it become too stiff in the rear??
Or ist it sufficient to change to the Dedra front arb, only (for a sportive street car, no race)?!
Thank you very much for any comments.
Juergen

[Steve Webb]

I'm not sure if the coupe is the same but the 155 body is not as stiff as it could be. I'm sure we have all been shocked when we have jacked the car up only to find that the front doors don't open or shut very well.

I found that the Dedra front anti roll bar along with a front strut brace tightened up front end response no end. There is still some understeer but turn in to corners is now much more direct.

It might be worth trying this first, then seeing if you want to adjust the handling any more.

What suspension are you running at the moment?

Might be worth posting these again:


http://www.berlinasportivo.com/forumpics/understeer.GIF

http://www.berlinasportivo.com/forumpics/oversteer.GIF

[Stichl]

Hello Steve,

Thank you for your answer. I will do as you stated and try the Dedra swaybar first - I have a front strut brace installed as well, additionally I did seam welding to the front axle carrier. I hope this is sufficient to get it stiff.
A good solution in my eyes is to use these braces from an 156 GTA
http://www.alfaworkshop.co.uk/images/52-2-800.jpg

To your question: I have D2- coilovers installed - these are the coilovers for the Fiat Coupe 20VT, not the Alfa 155 Q4. I had to do minor changes to the rear axle carrier to get them fit. Problem is that I have the wider wishbones from the Fiat Coupe 20VT installed (front) - therefore I would have needed the front suspension from a Fiat coupe in combination with the rear suspension from a Alfa 155 Q4. But I think that there are almost no changes... only the price for the Alfa 155 Q4 D2-coilovers is much higher than for Fiat Coupe (I have read a few minutes before)???
Juergen

[Steve Webb]

A good solution in my eyes is to use these braces from an 156 GTA
http://www.alfaworkshop.co.uk/images/52-2-800.jpg



Do those braces bolt between the front subframe and the main body? Sounds like a good idea. When you jack a 155 up you can actually watch the front door move in its surround so any extra strengthening would be welcomed.

I was just checking you didn't have the standard saggy suspension.

[AlfaJack]

Yes the 155 does flex a bit when jacked up. You say you have wider wishbones from the Coupe but I thought they were the same?

[Stichl]

Sorry, you are right - wishbone are the same, the wheel hub differ.