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09-27-2009, 04:50 PM | #1 |
Drives: Yaris 09 T-spirit 1.33 Join Date: Jul 2009
Location: MALTA
Posts: 121
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understeer
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
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09-27-2009, 04:57 PM | #2 |
Super Moderator
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rear sway bar has helped the most in my case
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09-27-2009, 06:13 PM | #3 |
It's the illusion you see
Drives: 07 Yaris Sedan Aero Join Date: Oct 2006
Location: Brossard, QC
Posts: 3,888
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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. |
09-27-2009, 08:59 PM | #4 |
Drives: Blazing Blue 08 liftback Join Date: Dec 2008
Location: Euless Texas
Posts: 241
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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...
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One Year One Oil-AMSOIL at www.Trulube.com TRD Exhaust, Springs and Struts. TRD SSK. NST Underdrive Crank Pulley. Amsoil Dominator 10w-30 Racing Oil, Amsoil DOT4 brake fluid, Amsoil Severe Gear 75w-90 transmission oil, Ultra Racing 23mm Sway Bar, Camber Bolts, R1 Drilled Slotted front Brakes and SS Brake cables from Micro-Image. Orange Konig Daylight 17s, Kumo MXs. Greg@TruLube.com |
09-27-2009, 09:47 PM | #5 |
Reluctantly Crouched...
Drives: 2008 Yaris HB M/T Join Date: Oct 2008
Location: DFW, TX
Posts: 867
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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. |
09-27-2009, 09:50 PM | #6 |
Drives: '09 Yaris carmine red 2d HB Join Date: Jun 2009
Location: Middletown, NY
Posts: 1,502
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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. |
09-27-2009, 11:01 PM | #7 | |
Start another Oil Thread!
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alignment, tire pressures, and lastly, a rear swaybar.
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09-28-2009, 12:20 AM | #8 |
Beast
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Thats the way to go, then learning how to swing the back
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One you've taken a yaris for a spin, there's no turning back. Its a Chao!!! |
09-28-2009, 06:21 AM | #9 |
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Drives: yw calls me douche and racist. Join Date: Aug 2007
Location: hay
Posts: 2,183
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You can always find another non-full sized spare, and put two of those in the rear.
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09-28-2009, 07:25 AM | #10 |
Joey
Drives: '14 Scion xD 5-speed Join Date: Oct 2008
Location: El Monte, Ca
Posts: 3,529
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That or heavy straight-line braking with almost no trailing, followed by not-so-heavy throttle through the corners
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09-28-2009, 05:48 PM | #11 |
Drives: Yaris 09 T-spirit 1.33 Join Date: Jul 2009
Location: MALTA
Posts: 121
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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? |
09-28-2009, 07:36 PM | #12 |
Super Moderator
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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/pro...0&categoryId=4 23mm: http://shop.microimageonline.com/pro...5&categoryId=4
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09-28-2009, 08:33 PM | #13 | |
Start another Oil Thread!
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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
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09-28-2009, 08:36 PM | #14 | |
Start another Oil Thread!
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people keep mentioning parts he should buy
i wager he needs a REAL alignment one is not enough
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09-28-2009, 11:27 PM | #15 |
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Drives: yw calls me douche and racist. Join Date: Aug 2007
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I plopped down one of those adjustable camber bolts that Garm sells. WHOA. Just, WHOA.
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09-28-2009, 11:46 PM | #16 |
Reluctantly Crouched...
Drives: 2008 Yaris HB M/T Join Date: Oct 2008
Location: DFW, TX
Posts: 867
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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.
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09-29-2009, 12:27 AM | #17 |
ULTIMATE
Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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all good advice. alignment is super important for higher performance in turns. so is a rear sway bar in this car.
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09-29-2009, 01:09 AM | #18 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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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.
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