Why does my front tire lift?
#1
Why does my front tire lift?
In autocrossing my FC, I always get people coming up and telling how I lift my front wheel all around the course. My question. Why?
Suspension is Ground control coilovers, 450# front/ 250# rear, on Tokico Illuminas Front/ Koni Sports Rear, with stock sways. I have DTSS eliminators and the rear camber adjuster. I would estimate power between 200 and 250 RWHP. Nothing extraordinary.
The followup question will be, is this desirable, or should I be doing things to correct it? If so, what do I need to do.
Photo illustration:
Suspension is Ground control coilovers, 450# front/ 250# rear, on Tokico Illuminas Front/ Koni Sports Rear, with stock sways. I have DTSS eliminators and the rear camber adjuster. I would estimate power between 200 and 250 RWHP. Nothing extraordinary.
The followup question will be, is this desirable, or should I be doing things to correct it? If so, what do I need to do.
Photo illustration:
#4
Buildup Thread Encourager
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I'm 5'11 and my head is (was) too close to the roof for my taste. I'd hit it if I ran over a bump I didint see. I swapped for TII seats to solve it
Anyways, I hope someone helps you with your wheel issue.
#6
Senior Member
It's been a long time since I autocrossed, but, as I recall, that is a sign that the front roll stiffness is way higher than the rear. If desired, you can correct with a smaller front sway bar, or lower rate springs, or maybe by doing the opposite in the rear.
I wonder... do you get a lot of roll in the rear, instead of oversteer?
Never mind about my question--I just looked at your picture again, and you do.
Great picture, by the way.
I wonder... do you get a lot of roll in the rear, instead of oversteer?
Never mind about my question--I just looked at your picture again, and you do.
Great picture, by the way.
Last edited by buttsjim; 09-05-06 at 07:10 PM.
#7
you look like a big guy. all your weight being shifted to one side of the car in a turn will do that. even it out.i moved my battery next to the intake. it provides much better wieght distrubution.
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#9
strike up the paean
wow
450F 250R?
thats like 8/4... mad understeer
how well does the car rotate with spring rates like that?
edit: just looking at the pic... the rear outside is squatting... alot, especially relative to the front. its no surprise the front inside is lifting. i would put stiffer springs in the back.
450F 250R?
thats like 8/4... mad understeer
how well does the car rotate with spring rates like that?
edit: just looking at the pic... the rear outside is squatting... alot, especially relative to the front. its no surprise the front inside is lifting. i would put stiffer springs in the back.
Last edited by aznpoopy; 09-05-06 at 08:00 PM.
#10
Senior Member
I wouldn't add weight, since he doesn't notice any ill effects when driving. He only knows the wheel lifts because people have told him so.
Unless I was getting too much understeer, or driving on the sidewall, I'd live with it (lots of good autocrossers exhibit that trait (or used to, anyway)).
Unless I was getting too much understeer, or driving on the sidewall, I'd live with it (lots of good autocrossers exhibit that trait (or used to, anyway)).
#13
strike up the paean
happens turning both ways? i would rule out your size being a factor.
imo, (as stated above), rear too soft relative to front
increase rear spring rate or reduce front springrate
especially since your driving style must be to:
turn in and then use throttle to rotate the car
that will only load the rear more
imo, (as stated above), rear too soft relative to front
increase rear spring rate or reduce front springrate
especially since your driving style must be to:
turn in and then use throttle to rotate the car
that will only load the rear more
#16
strike up the paean
Originally Posted by JDuncan
350#? 450#? What to put in the rear? I still haven't upgraded the sways. Was looking at going with the full Racing Beat bar set. What would be a good autocross spring rate setup with the Racing Beat bars?
keep the rear softer than the front but bring the rates closer together. how close is up to you ... maybe ask a few local autox'rs for advice.
#17
I R SAD PANDA W/O BAW
Go down with your front spring rates and/or smaller front sway bar. I'd recommend you stay away from the rear RB sway bar, several people including myself realize it makes the rear too stiff. Go with a stock sway bar or none at all (I'm doing the latter).
#18
Lives on the Forum
I'd try something like 350lb/in rear springs and some Eibach sways, as they're adjustable, and the RB's aren't. They're also stiffer. When Dave Turner Motorsports was competing their GTUs in STS2 they used 400lb/in fronts and 325lb/in rears, so 450/350 is pretty close to that for the relative stiffnesses.
I've got RB bars with stock springs and it still understeers, but with stiffer springs it's a different story that I have no direct experiance with. But a blanket statement that the RB bars make the rear too stiff isn't true.
I've got RB bars with stock springs and it still understeers, but with stiffer springs it's a different story that I have no direct experiance with. But a blanket statement that the RB bars make the rear too stiff isn't true.
#19
Haven't we ALL heard this
I am going to just toss this out....
You bought coilovers....
Have you ever heard of getting your car corner weighed?
I think that is where your problems lie.
If you haven't done it yet...its the MAIN benifit of owning coilovers.
James
You bought coilovers....
Have you ever heard of getting your car corner weighed?
I think that is where your problems lie.
If you haven't done it yet...its the MAIN benifit of owning coilovers.
James
#20
I R SAD PANDA W/O BAW
Originally Posted by Black91n/a
But a blanket statement that the RB bars make the rear too stiff isn't true.
#24
Sharp Claws
iTrader: (30)
rear end is squatting too much, really. yes i said really, the problem lies mainly in the rear of the car not the front.
higher spring rates in the rear or try cranking up the coils. see the *** dragging on take offs and hard cornering? that is bad because the whole frame is trying to twist.
keep cranking the rear end up until you just start having oversteer issues then back off a little.
higher spring rates in the rear or try cranking up the coils. see the *** dragging on take offs and hard cornering? that is bad because the whole frame is trying to twist.
keep cranking the rear end up until you just start having oversteer issues then back off a little.