understeer

[DOMAV]

what can help understeer?? my 2009 yaris is lowered by tte springs and handles really well but have some under steer, what can i do to improve this?? thanks

[tk-421]

rear sway bar has helped the most in my case

[IllusionX]

just becareful with oversteer, one might not be able to handle it when it happens.
understeer can be corrected easily by slowing down.. not over.

Anyways.. to eliminate understeer, you can get a rear swaybar, or use of stiffer rear suspension. Hence the reason why you should know your spring rates before lowering.

[Lazerdot]

I used a TRD rear sway bar, spring and struts from TDR, Camber bolts up front. I AX as much as posible and only swung the rear end once. I'm on Kumo MX 17/215-40s which may hold the rear in. I'm planning on Penguin Spacers and Camber in the rear and have ordered the Ultra racing 23mm sway bar. This car is hard to oversteer in my opinion. On Stock tires,...maybe. Just my 2 cents for all its worth...

[ozmdd]

Rear swaybar makes the Yaris feel like a new car. Universally considered one of the best bang-for-buck mods you can do. Really, the Yaris should have come with one from the factory but for the fact that its marketed as a high-efficiency, low cost car.

If you had the car dropped, its almost certain that you have significant toe-in. If you haven't had a GOOD alignment done after the new springs, then I'd be willing to bet that's your problem.
My new springs, combined with camber bolts, left me with 3.9 degrees of toe-in! That was a fun drive home.

[RedRide]

Yes, a get a rear sway bar. I love mine.

About understeer vs oversteer.....
Granted, oversteer casn be dangerous and this is why manufactures bulid in understeeer.

However, we are talking about limiting understeer, not adding oversteer.
The stock Yaris definatley has excessive understeer.

[Tamago]

alignment, tire pressures, and lastly, a rear swaybar.

[TheRealEnth]

alignment, tire pressures, and lastly, a rear swaybar.

Thats the way to go, then learning how to swing the back

[ddongbap]

You can always find another non-full sized spare, and put two of those in the rear.

[SilverBack]

That or heavy straight-line braking with almost no trailing, followed by not-so-heavy throttle through the corners

[DOMAV]

heyyyy thanks for all your help... my new 09 yaris was ordered with factory lowering springs which i belive they are TTE for eibach, i think they done the toe-in.

so i think the rear sway bar is the solution, can you sugests a good one?

and how about front upper strut will it do any differance?

[tk-421]

The TRD sway bar is 19mm, and the U*R offers it in 19mm and 23mm. I went for the 23mm and it is great (and less expensive). You can info on the bars here:

19mm:
http://shop.microimageonline.com/product.sc?productId=100&categoryId=4

23mm:
http://shop.microimageonline.com/product.sc?productId=125&categoryId=4

[Tamago]

alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment alignment

[Tamago]

people keep mentioning parts he should buy














i wager he needs a REAL alignment








one is not enough

[ddongbap]

I plopped down one of those adjustable camber bolts that Garm sells. WHOA. Just, WHOA.

[ozmdd]

The camber bolts are great, but you will REALLY need to follow Tamago's advice and get a good alignment once you install them. After NF210's and camber bolts installed at the same time, I had 3.9 degrees of toe in up front!! Can you say "tire dust?" Don't cheap-out on it either, go to NTB or a racing/tuning specialist.

[cali yaris]

all good advice. alignment is super important for higher performance in turns. so is a rear sway bar in this car.

[YarisSedan]

So for a decent mild alignment for street use should you go with 1 degree negative camber as well as zero toe? If thats the case then camber bolts shouldnt be needed i would assume just tilting of the strut slightly and then zipping them up to gain that one extra degree.

[ozmdd]

Anywhere from 1 to 2 degrees of negative camber up front should give a nice street set-up. You can purchase non-adjustable camber bolts from rockauto.com very cheap. I'm not sure how much, if any adjustment you can make without the use of camber bolts. While 0 degrees toe-in is preferred for performance, a very slight toe-in (1/16") will make the car track much better at highway speeds.

[ddongbap]

Anywhere from 1 to 2 degrees of negative camber up front should give a nice street set-up. You can purchase non-adjustable camber bolts from rockauto.com very cheap. I'm not sure how much, if any adjustment you can make without the use of camber bolts. While 0 degrees toe-in is preferred for performance, a very slight toe-in (1/16") will make the car track much better at highway speeds.

Toe out helps with speeds, not in. It seems like thats what you meant tho.

[TheRealEnth]

we need a real 1 incher on the rear...

[cali yaris]

stock set up should produce -1 degree if adjusted for that.

[TheRealEnth]

im talking bout an inch swaybar

[tk-421]

we need a real 1 incher on the rear...
Thanks but no thanks... :laugh:

[DOMAV]

why do you change the camber bolts? what do they have different from stock?

[TheRealEnth]

you can easily get more +/- camber with new ones

[Tamago]

Toe out helps with speeds, not in. It seems like thats what you meant tho.

no you're wrong

toe in = high speed stability.

[ozmdd]

Toe out helps with speeds, not in. It seems like thats what you meant tho.

Tamago is correct, toe out improves turn-in, not tracking straight. Toe-in basically points the wheels towards each other, so the car is "trying" to steer to the center, toe-out has both wheels pulling away from each other, or constantly "fighting" each other. Whichever way you favor, the car will move more quickly in that direction.

[ozmdd]

why do you change the camber bolts? what do they have different from stock?

Camber bolts, particularly the nice ones like Garm sells - have an eccentric lobe on the shank (like a camshaft) where it fits through the strut bracket. By adjusting the position of the lobe, you tilt the bottom of the strut "in" or "out" from vertical, and the hub/wheel goes with it. Viola! - camber!

The stock bolt you replace is exactly that; a regular bolt that doesn't have adjustability.
I hope that helps.

[ddongbap]

no you're wrong

toe in = high speed stability.

I am corrected.

[DOMAV]

Hi all thanks for all the help, so first a get the yaris aligned, then i do the rear sway bar! what will the front upper strut do? will it help?

as far as the alignment what is the factory setup? i think the garage guy will know but better if i know so i'll tell him thanks all for the help

[Tamago]

Hi all thanks for all the help, so first a get the yaris aligned, then i do the rear sway bar! what will the front upper strut do? will it help?

as far as the alignment what is the factory setup? i think the garage guy will know but better if i know so i'll tell him thanks all for the help

you don't want the factory setup. you want -1.5 degrees camber up front, 0 toe.

the rear you can't mess with without shims.

go read the "ultimate suspension guide" before you throw money away on a front upper strut bar.