Hi I need a little exiting the turn 101.

I have a problem with my rear end sliding out when i add throttle .

I have an open diff and i have an adjustable sway bar.

so

# 1. would i need to make my sway bar softer or stiffer ?
# 2. would an LSD help me to get more grip ?


Thanks !

 

Don't know the answers to your specific questions, but have you tried getting on the gas sooner in the corner? Assuming your problem isn't overpowering the rear wheels, you would start to transfer weight to the back before the centrifugal force started to carry your back end around.

 

soften your rear bar

LSD would help you accelerate out of the turn but it sounds like you're already traction limited. you'll have a higher chance of looping your car with an LSD and you break the rear end loose under power.

how much throttle input are you adding when you rear end breaks loose? barely tipping in, 25%, 50%, WOT?

is the entire rear end coming around or are you spinning the inside rear tire?

 

i have that problem a lot where the right rear tire well spin only when powering out of a turn, mainly when i'm giving it like 50% 75% gas trying to just get the end out a little at the end of the turn but i hate the feeling when only that one spins, does that mean i need LSD or am i doing soething wrong?

 

softer rear bar for more rear traction.....

 

i can't say that it feels like the inside wheel is slipping... my entire rear end is sliding out. i think @ about 35-60 % throttle. now this is in a fast ( 45 - 55 mph ) turn pulling over a g.

my car is lowered on eibach coilovers and i am also using eibach sways.

tires are adavn sports . 245 f / 275r

and here is my alignment

 

soften the sway bar - done !


will see how she does next time.


so lsd is not needed and can make things worse ?

 

Definitely softening the rear sway bar should help. What helped for me also is experimenting with the amount of gas in the tank. It really does make a difference as far as how your rear end handles and how much traction you get coming out of the corners.

I removed my stock exhaust and have a dual exhaust, which made my rear end lighter. I tried full, 3/4, 1/2, and 1/4 tank for autocross. I found out 3/4 tank is the sweet spot for me. I actually started a poll in this forum, which was very enlightening with some of the comments posted. Try searching.

 

^ thanks !

my car is a lot lighter ... i have a very light exhaust / cats and i do not have a spare.

 

i thought that was the benefit of a rwd. hehe

i feel that a lot even with 275 size rubber. try a different line that will rotate your car more on corner entry so u can exit in a straighter line.

 

In my experience, the open diff is the biggest contributing factor to the rear end sliding out.

As you corner, the weight shifts to the outside tire. As you get on the throttle, you add acceleration forces to the inside tire and the force vectors exceed the traction circle, causing the tire to spin, thus you loose grip in the rear.

What you want to do is get traction, and more wieght to the inside wheel.

The point of softening the rear bar is to transfer more weight to the outside tire. In theory, if the suspension is set up properly, this will help with more grip. However, if the differential is not transfering any power to the weighted wheel, softening the bar will actually make it worse in this case.

Having said that, experiment with different things and see what works. If you have an adjustable rear bar, and it doesn't cost anything, try different settings.

Good luck,
Rich

 

I just noticed that you have lowered your car. While I can't tell how much lower your car is that has a BIG impact on the handling. We had serious issues with the rear of our car being too low. The back end would always step out. We slowly raised the rear, a bit at a time (as well as other changes) until this went away.

One thing we have definately seen is that lowered Zs really like to step the rear end out. Don't go too low. If you live in the SF Bay Area, you're welcome to come by our race shop and I'd be glad to show you what we've done.

-Rich

 

Your rear camber is quite excessive. That combined with your lack of LSD are causing your traction problem.

Try -1.3 camber all around and zero toefront and rear. That will improve things alot.

JET

 

^ thank you guys ! will work on the lsd and the sway bar setup. here is a pic of my hight, i assume it is not too low....

 

I never understood why you would mod a car until you knew fully knew how it handled in stock trim. Just my approach to learning a car and then modding it once I know exactly what I want.

Who's to say your suspension setup is causing you pain?

For me, it sounds more LSD than anything else. Also, what tire pressures are you running?

LSD.

 

You are lowered but on stock shocks?? no no no no no

Stiffer front bar and some Koni yellows. And an LSD (quaife)

 

+1.

 

I would slow down. Or began accelerating earlier.

 

I thought this worked the other way around, the stiffer the bar, the more weight/load you put on the outside tire?

 

^+1 Exactly . . . I think he's got it backwards.