How to tune the car for racing in the rain?

[sinatra777]

Hi! I've been trying to find the best tuning settings to race my EVO IX RM on suzuka but still can't find the right combo.
I've set the diff 50/50 and set higher LSD values, set the suspension height to -10, left the default spring rate and bound/unbound rates, set the roll bars to 1 but still can't get the result - the car seems to handle a bit better but not the way it should. Maybe someone could please help me?

 

[Motor City Hami]

Try really soft springs and dampers. Let the car body roll a bit.

And maybe rear toe in.

 

[Adrenaline]

I have a... dumb, but rather simple question...
Are you using rain tires?

 

[budious]

It is not necessary to adjust the car if it drives good on race tires in dry weather, it will drive just as good as it can be made to drive in the rain with the appropriate tires equipped.

Use standard race tires when only light rain appears and there is no surface accumulation. When rain picks up a little more and there is a light surface accumulation, a little mist coming up from under the tires, then switch to intermediate tires. Once the rain starts coming down hard and your tires are spraying water out from under them, then you need the rain tire to handle the full accumulation.

Depending on the camber setting, I think you can use Race Soft in some circumstances and angle it to push the water out and maintain a slightly higher degree of acceleration traction on drive tires than using Race Rain. Though, this is highly subjective and works only for rear drive wheels. Otherwise, stick to intermediate or rain tires front and rear depending on conditions.

 

[FilletOfSpam]

I go for maximum downforce, more negative camber for cornering bite and more toe-in for stability so I won't spin as easily. A soft setup can help even if you have to raise your ride height to avoid bottoming out.

 

[Motor City Hami]

It the real world, I have a crew guy standing by with the wrenches for him to crawl under the car and disconnect the rear swaybar, if it starts to rain while on the grid. And, if I'm in a car with adjustable shocks, I'll have him soften the damping.

The ultimate would be softer sprung, dampers and swaybars. I have not tested in GT5 yet.

 

[RealBeerRacing]

I've been tuning my AWD cars with as much rearward torque bias as I can, usually 10/90, to try to get them to handle more like a FR car.

When it's raining, it goes as far forward as it can. If you read the description for that Civic Motul '87 race car (I might be a little off on that name), it talks about how it swept the series in its division and when there was a round in the rain it came in 3rd overall, despite being in the slowest of 3 classes, because being FF gave it an advantage.

 

[budious]

If you set torque sensing differential it should only send up to the amount your specify to the front, so 10% maximum to nothing. The power is only shifted to the rear. If you specify 50/50 then the front receives at maximum 50% of torque, but there is nothing stopping the mechanism from transferring 100% of it to the rear, though complete loss of traction on the front is highly unlikely.

I don't understand your point if you had one, your car still only has 10% maximum torque on the front. Setting it at 50/50 is still the most beneficial unless you need to adjust it to correct understeer issues.