Weight bias ratio, is it always better to have 50:50 even for a fwd car?

[00dc2]

porsche 911s may have 50:50 when braking but what about when accelerating? 20:80?

so our ITR's might have 50:50 when accelerating?

take your spare out and relocate your battery to just infront of the rear axle where the spare was... reduce weight.. dont adversely affect weight distribution.

[Evatec]

I agree with Anthony's comments (GoldCoastDC5R). Go for a softer rear end with a Honda. I tend also to run my tyre pressures on the rear at least 2 or more pounds less than the front.

[spoondc2r]

I agree with Anthony's comments (GoldCoastDC5R). Go for a softer rear end with a Honda. I tend also to run my tyre pressures on the rear at least 2 or more pounds less than the front.

You mean it's better to run 2 or more pounds less than the front?

[Evatec]

A couple of less pounds in the rear tyres seems to increase cornering traction and reduce oversteer. Lower pressure in a tyre increases the tyre foot print on the ground and as a result, tends to improve traction. Don't over do it though as other factors come into play.

[spoondc2r]

A couple of less pounds in the rear tyres seems to increase cornering traction and reduce oversteer. Lower pressure in a tyre increases the tyre foot print on the ground and as a result, tends to improve traction. Don't over do it though as other factors come into play.

Ya that's what i thought but i am thinking if i should put more pressure on street tyres

[fueltank]

its true that when the rear inside wheel lifts off the ground your suspension setting probably does give good traction.. mostly because the rear suspension has so little travel compared to the front that youll never be able to "pop a wheelie" meaning the front tyres lose traction

like how a rwd drag car has real soft suspension to aid traction

but traction is different to "grip" in that if you have all four tyres on the ground while cornering, you will ultimately have more grip in the corner which roughly equates to more cornering speed.. 4 tyres produce more grip than 3

this is why FF is such a hard platform to understand and get the most out of.. too much compromise!

You'll find that most cars have more suspension travel in the rear than they do the front.

[freakygeek]

Personally I prefer 2-3psi more rear tyre pressure. Oversteer at 140km/h in a fwd car is not a problem. Just accelerate out of the situation and correct with steering. Sure it might be a problem for unaware drivers and also in wet conditions, but used in the right way it can be quite advantageous

[euGeR]

I will tell you after a re-adjust my sussy I am going to lower the front more.

I've had a relatively flat set up to lower rear (so more weight in the rear). East coast suspension, who corner weight my set up, was a little concerned that my rake could have been too biased to the rear. My cross corner weight was approx 55-58:45-42 (have to check the sheet).

The rear is is more stable under brakes - less tendency to pitch and squirm, but also less tendancy to lift off oversteer. The lines you take have to be more accurate as trail braking becomes more difficult.

Long swooping bends have an nice stable planted feel, no twitchiness or understeer.

It will understeer if you try and turn to abruptly and is likely to go wide if you dont get the corner right haha - rotation is a bit harder to get.

In the end, I think it will be a personal opinion, but I guess you'll never really know until you try right?

[narada]

I have to disagree with some of your comments. I have found that by rmoving the spare tyre makes the car quite tail happy when high speed cornering compared to having it in.

In addition to this very stiff rear suspension also makes the car tend to be a lot more tail happy. When tracking my car i have the front sussy very stiff with the rear quite a bit softer. This is because of the weight difference of the front and rear half of the car.

You make the rear as stiff as the front and it will become very twitchy and jumpy and on a track with an uneven surface this is a very bad setup. Allowing more travel at the rear, coupled with the lighter half of the car ultimately results in more grip at the rear.... Trust me a car which oversteers at 140kph is not exactly a fun experience.

hahah i think some of my comments were misunderstood..

first of all leaving the spare tyre in the rear creates unnecessary momentum in the rear of the car, but doesnt mean oversteer.. the rear of the car takes slightly longer to respond and when you have a stock chassis like mine creates a little bit of flex and instability

but your right.. taking out the rear tyre can aid oversteer.. or understeer.. depending on how you drive..

and by saying stiff front and rear suspension, i didnt mean they should be equal.. stiffness should be relative to the weight of the car too but the rear suspension should still be "stiff" enough so you dont lift up your inside front under acceleration..

my rear is actually too stiff compared to the front for cornering and braking purposes, but is useful under power cos i dont have an LSD

i guess things like this are more apparent in a car like my stock clio.. where there's no LSD and the chassis is a little more flimsy =D

just remember.. how you drive the car is what makes the difference!

Euge.. i didnt realise lowering the rear of the car balances out the weight!

[spoondc2r]

So should i lower the rear tyre pressure and rebound a bit more if my car oversteer when i brakes (no matter how hard) during corners? I just keep feeling that the car will oversteer during corners, no matter i am stepping on the accelerater or brake. But it will oversteer definitely if i tap on the brakes.

[Evatec]

Normally, reducing rear tyre pressure and softening rear suspension improves rear wheel traction during cornering. If you cannot reduce the oversteer, then try a different brand of tyres or simply go to bigger tyres. Dropping the throttle or tapping the brakes going into corners certainly increases the chances of small to major oversteer.

[Evatec]

Personally I prefer 2-3psi more rear tyre pressure. Oversteer at 140km/h in a fwd car is not a problem. Just accelerate out of the situation and correct with steering. Sure it might be a problem for unaware drivers and also in wet conditions, but used in the right way it can be quite advantageous

Once I experimented with a dubious set of rear tyres that really caused the car to oversteer. And sure, what you say is correct, if you have the power, you can pull the car out of oversteer by planting the right foot on the throttle pedal. From my experience, I find the DC5 with the 2 liter motor is better suited to this type of driving than the 1.8 liter DC2 because of the greater torque from the larger motor. And, yes, there are sometimes advantages of hanging the tail out to aide cornering especially turn 6 at QR that effectively is a 180 degrees corner. On this bend, one can let the tail hang out and actually get the car in a straight line for a faster exit. The advantage is gained from front wheel traction with the car going straight under acceleration rather than cornering still. But...., definitely slower lap times overall. On 140 k + corners, I feel you are losing speed going sideways and giving the rear tyres a hard time in the process.

[spoondc2r]

Normally, reducing rear tyre pressure and softening rear suspension improves rear wheel traction during cornering. If you cannot reduce the oversteer, then try a different brand of tyres or simply go to bigger tyres. Dropping the throttle or tapping the brakes going into corners certainly increases the chances of small to major oversteer.

I am thinking the feeling of the "oversteer" are actually cause by the LSD, think i should keep holding the throttle rather than let it go a bit right?

[tinkerbell]

I just keep feeling that the car will oversteer during corners, no matter i am stepping on the accelerater or brake. But it will oversteer definitely if i tap on the brakes.

reduce your rear swaybar diameter...

[spoondc2r]

reduce your rear swaybar diameter...

Sigh.... it's a stock type-r swaybar....