I'm bored

"Justin Young" (jus1029) 10/17/2013 at 02:17 • Filed to: None

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TSLA > Justin Young 10/17/2013 at 02:22

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Pretty sure thats a V4, bro.

Anon > Justin Young 10/17/2013 at 02:36

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That lack or rigidity makes me nervous.

BiTurbo228 - Dr Frankenstein of Spitfires > Anon 10/17/2013 at 03:05

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It's an old trick used to maximise grip on old-school tyres. Basically you have soft ARBs on the rear so you get a lot of traction, and stiff ARBs at the front which loads the weight onto the outside tyre, increasing grip.

It's not done quite as much with modern compunds, but it was quite common back in the day.

GhostZ > BiTurbo228 - Dr Frankenstein of Spitfires 10/17/2013 at 05:11

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Doesn't it work the other way around? If you front anti-roll bars are stiff, shouldn't the torsion force on the bar move some of the "weight shift" to the outside to the inside, by pushing the inside tire down? Wouldn't soft anti-rear bars in the rear reduce traction by putting more weight on the outside wheel, which is pointed away from the corner?

It looks to me that the front anti-roll bars here are actually loose and the rear ones are stiff, which would make corner entry (where the front wheels have more weight due to braking) but help when pulling out from a corner (where the rear has all of the weight). So it seems to be more of a tune based around the assumption that corner-exit zones (and the following straights) are proportionally longer on this track than corner-entry zones, so you stand to gain a better lap time by sacrificing a little entry speed for good exit speed. Obviously in a heavier car with more HP, the effect would get smaller and smaller and the cost would get larger and larger as the car got heavier, so it's only viable in a low-HP, lightweight car.

I could be wrong though, so correct me if I am, but I think they don't do that type of tuning now because chassis stiffness allows for the inside tire (where you really want grip to be) to be able to get some grip.

Bluecold > GhostZ 10/17/2013 at 06:13

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Nope. If your front anti roll bars are stiff, they will try to keep the wheel level with the car. They are quite level with the body of the car in the picture. The rear however is canted with respect to the car.

Also, the rear swaybar delete is a common modification for racing 105-series Alfa Romeo.

http://www.alfaholics.com/2010/07/alfaho…

BiTurbo228 - Dr Frankenstein of Spitfires > GhostZ 10/17/2013 at 06:50

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What Bluecold said. Stiff ARBs actually reduce the level of grip at that axle, as the inside wheel is pushed up when the other is compressed. Usually this has the effect of keeping the car level, as both fronts and rears have the inside pushed up, causing that side of the car to sit lower and more level.

Your instinct is right though. It seems to be a tune to allow the greatest traction out of a corner at the expense of mid-corner speed.

Andy Sheehan, StreetsideStig > Anon 10/17/2013 at 10:19

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...

...that's what she said.

Anon > Andy Sheehan, StreetsideStig 10/17/2013 at 10:51

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You know I normally dislike these jokes, but that was pretty good.