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Old 25-02-2012, 10:26 AM   #1
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Gimme a Brake

I am after some advice regarding tuning if anybody would be so kind.

I have been experimenting with how-low-can-you-go rear spring rates on RWD tunes and have been very pleased with the results. I know it is not always possible to eradicate oversteer and that many of you use it for turn-in anyway. However, in extreme cases when the front spring rate is taken very high I have noticed that this has an adverse affect on braking as the car becomes very light on its loafers at the rear. Moving the balance forward helps a lot, but even so the rear still kind of floats.

So, is there anyone else out there who uses or has used the soft rear/hard front setup on RWD tunes and how have you addressed the braking issue? Are there any Damping tricks that will help?

Thanking you all in anticipation.
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Old 25-02-2012, 11:30 AM   #2
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Try going softer on the spring rates, but harder on the bump stiffness. Then Softening the rear arb slightly.

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Old 25-02-2012, 01:44 PM   #3
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When messing with RWD I tend to leave front suspension well alone, I always regardless of drivetrain type run 55% front bias and 100% efficiency.
If you increase front suspension in the hope it will add grip at rear you will always have brake issues, mainly due to the weight not coming down onto the front wheels to allow 'dig-in' effect.
I'd concentrate on different aspects of rear suspension first and then tweak a little touch on the front afterwards.
Don't get me wrong I'm far from being a tuner but I do mess about with other peoples setups to allow a personal feel and I like RWD to be simple point and shoot affairs where possible.
Keeping the rear in check is also linked to throttle control and braking smoothly. There is a saying that goes 'slow is fast' this relates back to input to output ratio, turn in smooth accelerate smooth (enough to stop rear wheels spinning) and in turn you should get more from your tunes, this is probably why a lot of people say 'not all tunes suit all players'.
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Old 26-02-2012, 06:55 PM   #4
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Thanks for the responses guys - most interesting and useful

I believe I have solved the problem by rethinking the damping, but unfortunately I can't give you the details as I have now been sworn into the secret Guild of Tuners and if I told you I would have to kill you.

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Old 27-02-2012, 07:50 PM   #5
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Personally I steer clear of soft springs for two reasons:

1) I hate the wallowy feel I get. Don't know if it's lack of confidence in the car, but I'm usually slower with soft springs than a stiffer, well sorted set-up.
2) You may well notice that you pick up damage to the suspension from yoru car constantly bottoming out.
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Old 28-02-2012, 08:30 PM   #6
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I generally find that you can reduce the braking loss by reducing front camber and increasing caster to combat the reduced camber. The stiffer springs mean there is less travel under braking.
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Old 29-02-2012, 09:23 AM   #7
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... and hence less damping requirement at the front.

Many thanks for that suggestion, I will certainly give it a try.
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