Author Topic: Helpline... 1800WTF!  (Read 5794 times)

sandyk

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Re: Helpline... 1800WTF!
« Reply #25 on: January 23, 2007, 07:34:20 pm »
Another thing on weight transfer, I tend to use soft springs where I can, in any sim. I do this for a couple of reasons.
1. to help get good traction out of turns, to help with terminal velocity on the straight.
2. to help get the weight to come forward to help shorten the braking distance.

Another bonus that seems to come from the above is the tires tend to last a while driving at 10/10ths. I did a 48 min race yesterday in the FIA GT mod at Daytona, and was able to lap at my qualifying times or better for the entire race, except for when it was dark and I couldnt see.

How much and how fast the weight transfers I adjust with dampers (Bump and rebound)

I try to use an agressive diff to get the front end of the car turned in during cornering, which also helps to maintain good momentum through the turns. The down side is you have to be very delicate with the throttle..when I learned to drive on the track I was told to imagine egg shells under my feet and that I was driving on ice with slicks. It seemed to work and transfer across to Simming.

I dont know all the technical reasons for doing what I do to a setup, but I find my theory works for me. My setup theories come from when I was building my own setups for GPL 65 mod, which alot of other people found very stable and I managed to get a few world records with.

sandyk

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Re: Helpline... 1800WTF!
« Reply #26 on: January 23, 2007, 07:38:29 pm »
I thought I would include text from a file I picked up at Kiwisimracing. I think it was put together by Bazzil over there, so thanks mate.

Road Car Setup Guide
Most of this is taken from the GTR manual but I've taken out the useful bits

Understeer in medium / high speed turns
-reduce the front ride height
-reduce the rear wing

Spin on corner exit under power
-soften the rear slow bump (over doing this setting will produce understeer)
-loosen the rear anti-roll bar
-decrease the differential lock
-increase the front slow rebound
-stiffen the front anti-roll bar

Car looses grip on bumpy areas of the road
-soften the springs
-soften rear slow bump and fast bump

Understeer on corner entry
-soften the front slow bump
-stiffen the rear slow rebound

Oversteer on corner entry
-stiffen the front slow bump
-soften the rear slow rebound

My tires wear out quickly
-choose harder compound tires
-soften up the springs

Understeer at low speed / oversteer at high speed
-soften front anti-roll
-increase rear wing

Setting up your car for bumpy areas of the track (riding the curbs etc):

Understeer while going over bumps
-Soften the front fast bump
-Soften the front fast rebound

Oversteer while going over bumps
-Soften the rear fast bump
-Soften the rear fast rebound

If your car doesn't seem to notice the bumps
(if your car doesn't notice the bumps it means your car is not settling down fast enough after the bumps)
-you need to stiffen up all fast bump and fast rebound

If your car skates out from the bumps (neither end first)
-you need to soften all fast bump and fast rebound

The differential lock
A low differential lock will mean the outside and inside tires will lock together much earlier - a high differential lock has the opposite effect
power diff is the diff lock under acceleration
coast diff is the diff lock when off the throttle

camber / tire temperatures / tire pressures
Tire temperatures should be within a range of 10 across a tire (even temps across the tire is better) eg:112 108 103
-more camber will give you hotter inside than outside
-increase the tire pressure to raise the middle tire temperature

Anti-Roll bars
-stiffer front anti roll bar generates understeer
-stiffer rear anti roll bar generates oversteer
-stiff anti roll bars make a more rigid chassi but increase tire wear
-the front anti roll bar should be about 70% more than the rear

[SJ]Minorshunt

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Re: Helpline... 1800WTF!
« Reply #27 on: January 23, 2007, 11:20:07 pm »
PRINTED! Great info Ray and Sandy. :salute: I always set up for comfort and ease of driving. Mostly by feel. But that's not necessarily the fastest setup. This really helps clarify things.

If no one minds, I have another area of questions Sandy touched on briefly. ie tire temps and pressure.

What do you look for in tire temps? Per the above, you are trying for a setup that is ideally all temps close to the same across the tire, but how about the temp difference between front and rear? Do you want to see say 198 degrees F. front and back or will the rears naturally be hotter? And what is the ideal temp? What is too cold or too hot? Also do you want to match your tire pressure front and rear to compensate for the increase in pressure due to heating? What is the ideal pressure at temp?

Hope ya'll don't mind the many questions.  :)
Steve

sandyk

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Re: Helpline... 1800WTF!
« Reply #28 on: January 24, 2007, 12:03:02 am »
thats a tough question. Like real tires, different sims and different mods have different physics data, therefore that cant be answered simply by saying XX F temp is ideal. Depends on the car, tires and mod. I try to get a balance of temps across the tires..in rFactor you can get away with 10 C hotter on the inside than the outside and thats what I try to aim for...what temp is ideal, as above, its not a simple question to answer.

[SJ]Minorshunt

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Re: Helpline... 1800WTF!
« Reply #29 on: January 25, 2007, 01:51:20 am »
Ok Sandy. I just saw the tire thread below this one, (doh!) and think that thread answers my questions quite nicely. Thanks again for your responses!  :)
Steve

[SJ]KL Mallender

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Re: Helpline... 1800WTF!
« Reply #30 on: September 03, 2007, 07:59:30 pm »
Many thanks to all who contributed the information in this discussion, It is very helpfull to us that are new the "Sport" of PC Racing.

thx, Kevin.