Bending axles?
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Thread: Bending axles?

  1. #1
    Fellow Frogger!
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    Bending axles?

    Hey Guys,

    am sorting the suspension out on the 17 slowly. I remembered a tip from a guy in Canada who said that he had the whole rear axle bent in a 40 tonne press to give it negative camber!!

    I thought this wouldn't be such a bad idea until my friend reminded me that as it's a dead axle i.e the arc doesn't change as the wheel goes up so it's never in a 'better' position it never gets to a straight up and down position(unless the other wheel is dropping at the same time- fairly unlikely)

    Isn't this the whole point with getting negative camber- under high loading (caning round a corner) the wheels contact patch is maximised.

    Is this thinking correct? or does the sidewall/tyre distortion during cornering mean that this mod (bending the axle) makes it worthwhile?

    Cheers Ben

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    ps I couldn't figure out why the front spring heights were different- until I found out the 'professional' suspension specialist had reset only one of the rears!

    I am gonna pull both rears out and get them matched then see what difference that makes- BTW 1.5 degrees negative on the front makes corners much more fun!

  2. #2
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    Ben, I reckon you'd only want 1 degree max. if you're only doing it for the sidewall flex (and consequent lifting of the inside of the tread). For the effort involved, would it be worth it? You might regain a bit of understeer, too...

    I know that suspension places bend struts to get more negative camber.

    Still, if you're going for ultimate cornering power, it might just be the tweak, if you fart around a lot with tyre pressures and roll stiffnesses to get the balance right.

    It's turning into an interesting project!

    (PS. what's the thread called where you described the front camber modification?)

    Stuey

    <small>[ 30 April 2002, 07:36 PM: Message edited by: Stuey ]</small>


    2003 PEUGEOT 206 GTi

  3. #3
    Fellow Frogger!
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    Hey Stuey- it was called of all things- 'camber modification'!!

    Interesting too, was Alans quote (below) I am going to have to look into getting harder rear springs I think. It also needs to be evened up in the rear too. I do have to bear in mind that it's a road car with a little track work though- so 1-1.5 degrees negative is about all I'll run.

    Ben

    ps Stuey when I had the caster adjustment done the other day it was around 1 turn on the nut for 1 degree of caster

    G'day all, I fitted EA foulcan camber pins to the upper arms on my 15ts years ago. They were available through Ford dealers to solve some of their handling woes.They fitted like they were made for the Renault, although you do still have to elongate the holes in the bodywork to facilitate adjustment. I ran 2.5 degrees of camber and 4 degrees of caster with no driveshaft problems. Mostly, these cars need the rear springs upgraded from 50 pounds per inch to 200 to negate the understeer. Alan.
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  4. #4
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    Thanks for that caster info Ben. BTW is the R15 upper arm the same as the 17/12?

    Cheers

    Stuey


    2003 PEUGEOT 206 GTi

  5. #5
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    Sounds not too different to what we used to do with our Fiat 128s! I'll sketch it for you some time. cheers, Phil

  6. #6
    Fellow Frogger!
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    Hey guys,

    had a chat to my mate about bending the axles and he showed me pics of his fuego racing at Manfield in various corners and the rear wheels were basically straight up and down. By this I mean the car was heeling down into the corner and the rear tyres contact patch was al already maximised.

    He reckons any negative camber will basically not be worth it as it's a ' dead ' axle. After seeing those pics I am beginning to see his point.

    Cheers Ben

    ps Stuey I think the suspension components between the 12, 15 and 17 are just about identical- perhaps Simon or someone else could clarify this for you?

  7. #7
    1000+ Posts alan moore's Avatar
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    Yes,
    The R12,15 17 do have the same suspension components, barring sizes of sway bar and spring wire diameters. Rear neg. camber is probably only necessary in a racing setup. What they really do need is some front brakes from a 25, if you plan on track work. Hillclimbs are OK.
    Alan.
    '56 Renault 750 (16TS Power)
    '62 Renault Dauphine Gordini
    '89 Renault Alpine GTA V6 Turbo
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