fdslave_g

Today my car has just crash...badly. It was over steer at launch. ANyone has any reason to that?
I think it would be either the tire or the suspension...what do you guys think?

skunks

oh my...

In anycase, Oversteer is when your rear gets loose and you pretty much are throw into a drift (thats why I love rwd cars ) AKA: Front wheels have too much grip, more grip then the rears do. Understeer is when you turn the wheel and nothign happens (scary, especially when your driving a 2003 accord which does not even belong to you, but thats another story) AKA: Front wheels dont got enuf grip.

I think you might be talking about torque steer which usually happens on a FWD car with monster hp. In anycase, what happened? are you ok? are you gonna rebuild the car? when did this happen (Like at a red light or at the track)? Was it raining? What kinda tires/rims did you have?

fdslave_g

I'm driving FD therefore it's RWD. The front rim is 17" rear 18" it wasn't raining. This thing happaned today, on my wayback home on the bridge neck (slope). After that my car felt into the small water track...gosh! almost cry when i saw it like that

BLKTOPTRVL

In the first post you said it happened at launch? Then you said it happened on a "Bridge Slope" is that like an on ramp? If it is, and if you are saying that you hit a puddle of water, than I think the answer is that you applied power while the car was in transition, the rear end lost grip due to the wet surface, and you ended up in a spin.

If you are saying instead that the Bridge Slope is the road leading up to the bridge, then my experience has been that sometimes the surface of the road approaching a bridge (or on the bridge) does not have the same adhesion as normal surface road, and if you applied power and there was not enough grip available, then that would also cause you to spin.

Either way, Sorry to hear.

fdslave_g

I think it would be pretty much like the second case, cos the road is dry, just that I can't control the car's rear.

Any solution to this anyone? cos i keep spining for this reason. Will harder suspention help?, or should i go with softer?

particleeffect

As you come onto the bridge and there is a bump in the pavement seam (sp?) than softer could help, but of course you lose out on a turn in general with softer. The smartest thing to do is keep the car in a straight line from before you hit the bridge until your suspension has resettled after you come back off the bridge. If you are trying to turn anywhere near the grip limit of your tires, and something bumps them off the road, you will spin. They also do not need to leave contact with the road, but just have a large sudden change in weight on them, like the kind you get when cresting (going over the high point) a hill or bridge and you feel a little light for a moment –of course the tires are going through this too, and if you are already near their grip limit, you will pass their limit and spin.

Tire temperature, tread rating/condition, road condition, suspension stiffness, car weight and attitude and more things I won’t remember right now no doubt all have influence on whether your car can keep its hold, or spin out.

I used to read a lot about suspension dynamics, but once I reached a level where I was felt I had a reasonable understanding, I stopped, and thus I have no idea where all my good links are hidden, lol.

http://www.turnfast.com/tech_handling/handling.lasso

Basically, there are too many variables for us to tell you exactly what causes you to spin without more information. If the read seams like it is bouncing off of the ground and to a side, it could be that your suspension is too stiff, and the rear tires meat the seam at different times. That is, if a simply pavement seem is the problem.

Chronos

cute taiwanese girl same age as me sad because she crashed her FD...this is like one of my weird dreams

sorry to hear about your loss, I offer my condolences to you.

skunks

idk if she crashed her car and totalled it or just spun out (she said she keeps having trouble on this one spot in the road so I assume her car is still running). Also, fdslave_g, how come you keep going so fast over the same spot on the road and keep spinning out? why not just slow down if you know the road there is crappy?

Chronos

taiwanese = Thai sorry about that!

Fritz Flynn

iTrader: (263)

stiff slides first Just take some nuts and bolts out of the back end.

fdslave_g

I guess this might because people always dare me around that area, well, it's around my university, and those people always think girl can't beat guys, which always pissed my off. (well, in Thailand girls don't tend to drive that fast, and tend not to mod their cars...but not me) so that's why I keep driving fast.

And true the street is truely crap. My car is still siting in garage, waiting for new pain job and new suspention, since the suspension is totally ruined.

BNA_ELLIS

fdslave_g
real name would be easier I'm not used to calling people a slave. Well what happened depends on what size tyres you have on what width wheel. Also the stock setup of a fd is superb a lot of people mess up the handling by their choice of wheel size and tyre size, This often makes the car look better but handle worse.
An example i borrowed someone's stock wheels to put on my car for a few weeks. Th estandrad wheel is 16 inch x 8 inch He had 225 50 16 tyres on the front which is standard and he had 245 45 16 on the rear my car would oversteer like crazy, even when accelerating hard a from standing start, when I put my stock wheels back on a few weeks later which had less tread on the tyres it handled much better. 18 inch wheels tend to look good on a fd but often mess up the feel of the car. what suspension do you have ? If standard then it's nto the suspension. Depends on what you have and on what kind of roads. Speaking to people in Japan Tein suspension is very popular for fd's out there and their cars glue to the road yet in the uk for our type roads the stock suspension makes the car handle better. Also the same for tyres in Japan the have a harder compund which suits there roads fine but are no good over here. So Basically the setup on a fd is not always perfect for different kinds of roads.

rgds
Brian

BLKTOPTRVL

I'm not sure there is anything you can do to prevent the car from exiting the road when you meet those road conditions.

Even if you were to get the best tires and suspension in the world, when you hit a bump and wet spot while applying power you are going to take an unwanted trip.

Suppose instead of spending all that money to fix one condition - I gaurentee whatever you do to fix this, something else will suffer - why not learn that spot and back off for the instant you hit the bad spot and then hit the gas again.

Your friends may want to challenge you, but will they pay your repair/hospital bills?

GoRacer

iTrader: (2)

My cars *** is allways loose when I punch it on corners but just let go of the gas and it will correct itself. I've never felt torque steer.

You can also get a little loose launching if you are crooked when you take off, specially with cold street tires. Although the LSD is supposed to prevent that, I beleive.

Reword your question better, then post it in the suspension section: What size and kind of tires, suspension, launching or cornering.

skunks

Tire compound is also a huge factor as well as how you drive. Even with the widest and stickest tires, you can still break them loose.

Chronos

and why the hell would a wider tire in the rear create oversteer? It would seem to me that having more contact patch in the rear would give you MORE traction resulting in understeer, not oversteer.

EDIT: I think you may have forgotten to take tire compound in consideration and simply assumed that it was the tire size that made the handling difference...I can't think of any other reason why wider tires in the rear would create oversteer.

BNA_ELLIS

If you read my reply, you would see I stated as possible cause but I asked for her wheel and tyres size. The point I made with oversteer was on my car If put wider tyres on wider whells of cause you will get more grip etc
but if you put wider tyres on a stock wheel size you will find out how easily the back end steps out. Mazda put 225 50 16 on the 8 inch width wheel for a reason. You go and put 245 45 16 on the rear it may well look good but I can assure you that you will not have more grip because of the way the wider tyres sits on the rims. The only use for something like that without I can think of would be drifting. I did not say this was the cause of slave girl accident as I don't know what size rims and tyres she has, that's why I requested this info before passing any judgment.

rgds

Brian

Chronos

Thanks for the clarification Brian, I just rather skimmed over your comment...Do you know exactly why the wider tires have less grip??

skunks

It's all about the compound, well that and thread depth.


P.S. I still dont understand if she totally wrecked her car or if it just slid a little and screwed up the suspension...

fdslave_g

I slide a little... in fact I was almost be able to counter steer after 2 rounds of 180 degree spin, but one of the wheel felt in to the hole that leads to the water track first, then the whole car start losing control again and felt down in to the water track on the road side. I might go get the pix of my car soon, and maybe I'll post it up with the site, where the accident happen. :'(

Cihuuy

is ur avatar, ur ride??

BNA_ELLIS

basically the tyre is too big for the Rim and tends to white line. i.e.
follow the road camber and road markings too easily hence makes the car feel
twitchy at the back end not good.
The increase in tyre width does not aid traction as the tyre is effectively
ballooned and does not sit flat on the road so is more likely to loose grip.
get some 17 x 10's on the back with tyres too suit then you'll have grip. But if you put on 17 x 10 tyres on a 17 x 8 wheel you will have what I described above.

Hope this help's

rgds

Brian

fdslave_g

Yes that's my darling, "da silva bulleta"

fdslave_g

I'm thinking of changing to 17" too Should the width of the wheel be Front 8 Rear 9 or Front 9 Rear 10??? BTW does it help much?

BNA_ELLIS

17's all round woud be fine, to have wider wheels means you have to ahve correct offset as you may find if you do too wide it may not fit withour soem additional trimming. I said 17 x 10 as an example not as a neccesity. 17 x 8 front and 17 x 9 rear would be fine
Correct tye size would be 225 or 235 front and 245 or 255 rear don't mix it too far apart though i.e don't use 225 front and 255 rear. Makesure you have you camber setup correctly should be approx .5 negative camber as stock as it doesn't matter how good tyres and wheel combo you have if the geometry is off then unexpected things can still happen. As a rule rx7's are not too good in the wet fullstop. In the dry the're fantastic but in the damp or wet the're not good. mY little honda civic would probably beat my rx7 round a circuit in the wet.
Hope damage is not too bad, Good luck

rgds

Brian