Caterham Sigma 150 Brands Hatch Indy - Reducing Understeer?

brucey
Innes Ireland

Posts: 515

Caterham Sigma 150 Brands Hatch Indy - Reducing Understeer? Jan 22, 2014 10:31:07 GMT

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Post by brucey on Jan 22, 2014 10:31:07 GMT

Any idea what I should adjust to reduce understeer going into Padock and the last corner before the start/finish straight.

I prefer a set up that turns in slightly if I take my foot off the throttle but seem to go from understeer to oversteer very quickly. I guess I could just slow down!

I have played with antiroll bars settings (running on smallest currently), diff settings (around 15 to 25%), front camber (2.8 deg), rear camber (1.5 deg), tyre pressures (can't remember).

I think I've probably managed to make it worse! I have found that a car that 'feels right' isn't necessarily the quickest.

Any help appreciated. I'm not just after a free set up, just trying to learn what to adjust.

cageyh
Administrator

Posts: 3,034

Caterham Sigma 150 Brands Hatch Indy - Reducing Understeer? Jan 22, 2014 16:45:19 GMT

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Post by cageyh on Jan 22, 2014 16:45:19 GMT

I have the same issue Brucey. I should be able to go a bit quicker once I sort it out.
I upped the front ARB, reduced rear tyre pressure, increased front and moved the brake balance forwards. Seemed to help a bit.
Other than that, change your line into T1.

brucey
Innes Ireland

Posts: 515

Caterham Sigma 150 Brands Hatch Indy - Reducing Understeer? Jan 22, 2014 22:33:02 GMT

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Post by brucey on Jan 22, 2014 22:33:02 GMT

Cheers Cagey,

Had another play tonight and got the handling a bit more predictable. I made the decision to do all my practice with race fuel levels as it becomes the norm.

5% either way on the diff settings seem to make a significant difference. Choosing a slightly different line also helped on a couple of corners.

I will find out Friday how good my tweaking was, it should be fun and pretty close!

cageyh Administrator Posts: 3,034	Caterham Sigma 150 Brands Hatch Indy - Reducing Understeer? Jan 23, 2014 13:05:31 GMT via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by cageyh on Jan 23, 2014 13:05:31 GMT I find that the race fuel helps stabilise the car as well. It's good to practice with a light fuel load as well, as the end of the race is just as important.

Caterham Sigma 150 Brands Hatch Indy - Reducing Understeer?

Post by brucey on Jan 22, 2014 10:31:07 GMT

Post by cageyh on Jan 22, 2014 16:45:19 GMT

Post by brucey on Jan 22, 2014 22:33:02 GMT

Post by cageyh on Jan 23, 2014 13:05:31 GMT