idamaster

Im having a pretty bad understeer problem in my s13. I think its the tires because compared to everybody elses tires my treads are kind of hard. The tires are supposed to be sticky but I dont think they are at all. I hydroplane pretty easily too. Ill sometimes spin leaving a red light/stop sign. But the main problem is that I can corner faster in a jeep. If I try to take a turn faster than usually the front wheels will be turned to one side and the car will slide forward. Its also very easy to throw the car into a slide. Someone said they think that my front tires are too big and thats why but that makes no sense to me.

What Parts I think matter.
s13 sr20
KTS coilovers
Tanabe Swaybars with RSR bushings
Tanabe front/rear strut bars
SPL steel steering bushings
Bassett racing wheels
Cusco Motor mounts
Dunlop super sport 9000's all in 225/50/15

S13CoupeLover

I know what you mean about under steer. I am on Nexen's at the moment and they're not the best tires for anything really. but heck try to get a good alignment, what i have right now is about .5 camber in the front with 1.5 ish in the rear. i would also say put the toe to maybe 0 or some negative toe in the rear. after i got this done you just need to get the valving to where you like it. the adjustments done to the coilover has allot to do with it also. the guy i go to told me to try and get the rear end softer than the front and mess with the air pressure in the tires. and just mess with what you can.

I'm not sure form what you said you may not have RUCAs, toe rods, to get the rear end to the proper alignment. the front adjustability should get you where you would want to be at.

hoped that helped a little.

Antihero983

Just so you know, S13s are notorious for understeer.

You seem to have the mods to help alleviate that, so I dunno.

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Silverbullet

most aftermarket roll bars are way thicker than they need to be, especially in the rear. the car should have oversteering tenancies. Make sure your alignment is in check as well as your tires. Are you running same set of tires on all 4 corners?

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roboticnissan

how much experience do you have racing cars?? it could easily be you.

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NINJASPY

do you have a lsd?

Grenade180sx

best question ever... you must be a race car driver to not understeer now. BAHAHAHA

dsastr_clan

i used to have mad undesteer issues till i talked about different suspension settings withs lots of drifters and after messing with my suspension i fixed my problems, im on a SOHC pretty weak but it gets the job done, i have my coils on the hardest setting on the rear with 45 psi and on the front i go all the way to soft and go 10 clicks back and run 30 or 35 psi depending on the weather, is better when u have the front softer than the rears you will noticed less understeer. Give it a shot

mothon

I bet your front toe is off. Also how much camber are you running?

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ajbrain

i would say how you turn into a corner and what are you doing in the corner. are you going too fast getting into the corner and give a hard brake action? are you keeping steping on the brake in the corner? slow down to the max speed to get into a corner than give a little brake or gas in the corner. accelerate when you get out the end of the corner period.

idamaster

Im not wanting to say im some kind of professional driver but I know my way around the block. Yes, Ive got the same tires all around. I took 2 pictures for the front settings:
Right

Left

dsastr_clan

oh and i run 2 screws on camber plates to so i can get lots neg camber at front( im wreckless like that)

mothon

That is absolutely zero help in telling me how much camber you are running.

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babyjesus

go with a smaller front sway bar, maybe like stock, then you'll get just a bit of overesteer depending on how big your rear sway bar is. ....i had the same problem, gonna run a slightly bigger rear sway bar, should be fine like that

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idamaster

Ill do my best to fill you guys in on the info but I don't know suspension in detail. Just let me know what you want to know. Tell him how to measure whatever you guys want and Ill do it.

Xplat

First of all, you need to make sure EVERYTHING that is adjustable on your car is set to a proper starting point before you go fiddling with shit.

Start by making sure your tire PSI is proper for your tire. Check tire specs. Too high means less grip.

Next, make sure your front coilover perch heights match. Then check rears. Mismatched shit leads to corner weight problems. Which can cause anything from understeer to oversteer depending on how you've set your car up.

Next, set ALL damper settings to their softest setting and work your way up to your preferred settings.

Finally, get your car aligned front and rear.

fcdrifter20

This is the first thing that should have been brought up. dont kno how many times i have seen this before.

Kids complaining about under steer saying its that they need to adjust the suspension or that they got shitty front tires. then i tell them to check psi. they are running 40- 45 psi and wonder why under steer occurs during cornering??

start at checking that, bring it down to 30ish psi and see how that works

fckillerbee

omg...full of fail

check all tire pressure

have the car properly aligned

if everything is in spec, remove front sway bar to creat oversteer

when all else fails...replace the driver.

idamaster

Tires pressure is 32psi. I think it is the tires not gripping the road because the car wants to turn but it rather starts to slide.

fckillerbee

now go take off your front sway bar and drive the car around.

PoorMans180SX

Move the two inner bolts in your camber plates towards the out bolts and adjust for more camber. About 3 degrees is good. It will definitely help with the understeer.

Get tension rods (or at least bushings) And a tension rod brace. These will help immensely. Your whole front suspension will move around a lot less and keep your tires from overloading.

Mess with the valving on your coils. Try different settings out. See what you can do.

Add more tire pressure in the rear.

Also try smoothing out your driving style. Go in slower and smoother and step on the gas later.

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drift freaq

Hahahahaha and thats some comedy right there. Actually S13's are not that bad in the understeer department. You should now this as well because you have played with S30's which really have understeer issues. Truthfully if the guy is having understeer issues. First off has he corner balanced the car? Since he is running fully adjustable coilovers.

Oh and how stiff does he has dampening? Because with Tanabe sways ( which are fucking huge and probably more swaybar than he needs on a street car) Its going to eliminate all body roll which could induce understeer especially if the car is slammed and he has the coils set on full stiff. Which can make the car way over sprung and fuck with handling.

Oh and dialing negative camber in is not the answer to all either.

First rule of thumb would be either dial back the dampening a bit or go to smaller sways especially if you are trying for more traction.

There is a reason a lot of guys in Japan run stock or SE and Hicas bars on their cars with coils.
True D1 guys use larger bars but ah your not a D1 driver. LOL

Oh and a lot of the Road race guys run no rear bar at all.

Take of all of this for what its worth.

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racepar1

That shows how much you know about driving. An idiot driver can easily cause a perfectly good car to understeer. More then that an idiot driver is likely unclear and uncertain as to what the car is REALLY doing.

The way you are describing how the car drives just doesn't make any sense to me.

Just to start though 225/50/15 dunlop sp9000 tires are pretty lame. Your suspension is far too aggressive for those shitty tires.

kuramaya

You don't mean "starts to slide" but "starts to push" right?

First have you had your front alignment set? What are the specs?

225/50's too much side wall for me. I run 215/45 and thinks thats a good setup. People are mentioning different types of tires...I dont think thats an issue. I Run FED RSR on the front and 595's o the rear and never have a push problem...As mentioned check PSI. You should be running Neg camber if your sliding anyway for control. How stiff do you have the front shokacho at? Play with that a bit. Does it happen when going right and left? If so could be a toe problem.

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jspaeth

I run Tein SuperStreet, slammed pretty well, but no tuck really. My shocks are set way too high probably.

All aftermarket (solid endlink) suspension, except for LCAs.

SPL subframe spacers, aluminum subframe bushings.

Tanabe swaybars.

Let me say, that at higher speeds, the car feels pretty neutral, and I can give it gas and get traction and control the car.

However, sharp turns at relatively low speeds, the car always feels like it wants to lose the back end.


May try loosening the rear swaybar and softening the rear struts.....

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Shvltme93Notch

problem solved. seriously? ok. try getting your front camber a ittle closer to factory spec and then see how it drives.

fcdrifter20

mite come down to that last option lol

PoorMans180SX

Hahaha, you're kidding...right?

BTW, Drift Freaq is probably most right.

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idamaster

What I meant by the car wants to turn but starts sliding is that the front tires lose traction and just start to slide forward. I talked to the man I bought the car from and he said he spent a pretty penny on the tires and he said he was very, very disappointing with how they performed. Would softening up the suspension help with hitting small bumps while cornering because my tires seem to lift off of the ground if I hit a bump in a fast corner. Ive got the rest of the RSR bushings but I dont have the right tools/ parts like new ball joints to change these out so they're going to have to wait. Im still learning about suspension so take it easy on me you bashers.

LayNLow

Go to your local autoshop and ask for an alignment CHECK and for them to print out the numbers front and rear. Then get back to us. In my area alignment checks are free, but if not it shouldnt be more than 20 bucks.

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