|
|
10-12-2009, 04:12 PM | #1 |
Reluctantly Crouched...
Drives: 2008 Yaris HB M/T Join Date: Oct 2008
Location: DFW, TX
Posts: 867
|
Serious Autocrossers?
Not to suggest that you must be "serious" to enjoy autoX, but I'm looking for anyone who is/has also preparing their Yaris for SCCA classing beyond H-Stock.
I'm planning on running in ST all next year, and would like to run some regional events, maybe even Nationals, so proper prep is critical. I can't do much else HP-wise, but I will be looking at class-legal chassis bracing and more suspension tuning/upgrades. I'd like to start by getting your feedback about alignment specs that you've tried on the autoX track. Particularly the rear. I know many people like to run negative camber in the rear, but this would reduce rotation, which increases understeer, so not sure it is useful. What about rear toe settings? I'm currently at -2.25 camber in front (each side) and zero toe. Thinking about trying a bit more, and maybe 1/16" toe-out. This car has to stay daily-driver -friendly. After that, what ST-legal bracing options can anyone suggest or give feedback about? While the Yaris is definitley not a class-killer in ST, I think it can be a competitive car. I ran less than 1.5 seconds behind a fully-prepped Focus SVT whose driver has placed at Nationals in that car before, so I dont' think we're out of the running completely. |
10-12-2009, 04:56 PM | #2 | |
Start another Oil Thread!
|
no "bracing" is legal in ST or even FSP classes.
front strut tower bar is your limit. skip that useless rear "strut" tower "bar" as it does nothing but weigh your car down. alignment, if you want to help with rotation, throw a Penguin Garage camber shim under the front lower bolt on either side of the rear hubs. that'll give you a bit of camber, but more importantly dial-out some of the aggressive toe-in that occurs (and worsens with lowering of the car)
__________________
Quote:
|
|
10-12-2009, 05:35 PM | #3 |
SIPNDEW
|
|
10-12-2009, 07:28 PM | #4 |
Reluctantly Crouched...
Drives: 2008 Yaris HB M/T Join Date: Oct 2008
Location: DFW, TX
Posts: 867
|
That may be correct, but I do know that "odd"vehicles often get thrown into the SP or SM classes at our SCCA events, since they aren't likely to be protested there. Not planning to X-brace, so should be safe there. Thanks.
|
10-12-2009, 09:14 PM | #5 |
Right beside you, wave
Drives: 08 PBM Yaris Sedan Join Date: Oct 2008
Location: Louisville, KY
Posts: 742
|
Tires. A rear sway bar helps. But setup is key. I run a slight bit of camber in the rear. Noticed a difference in rear grip.
__________________
2008 Toyota Yaris Sedan. Pacific Blue Mica. Custom vinyl eyebrows, color matched interior trim pieces, Vios lip spoiler, 17" Maas rims 2010 Scion xB 7.0 Release Series. 1535 of 2000. Murasaki. Stock with TRD springs. |
10-12-2009, 10:13 PM | #6 | |
Reluctantly Crouched...
Drives: 2008 Yaris HB M/T Join Date: Oct 2008
Location: DFW, TX
Posts: 867
|
Quote:
When you say "rear camber" do you mean positive or negative, and do you know how much? How about toe? Thx! |
|
10-13-2009, 07:14 AM | #7 | ||
Start another Oil Thread!
|
Quote:
no TRIANGULATION is allowed.
__________________
Quote:
|
||
10-13-2009, 05:39 PM | #8 |
SIPNDEW
|
|
10-13-2009, 07:36 PM | #9 |
rarer than JDM -1 of 1!
|
F- STREET PREPARED is not prepared (eg.- FP,/EP/BP, etc.)
Prepared classes are where you would be with the gt-spec under bars. And a yaris has no place in ANY prepared classes. Go look up what runs in prepared classes. |
10-12-2009, 05:00 PM | #10 |
Slowy getting there
|
You want to give some info on what your setup that you have now. I will give what I have picked up at different events and from other reliable sources.
A little toe out in the rear will help your car rotate more. Might want to think about getting some stiffer springs than your NF210's you already have a good wheel and tire setup. Lots of track time is one of the best things you can do.
__________________
|
10-12-2009, 07:26 PM | #11 |
Reluctantly Crouched...
Drives: 2008 Yaris HB M/T Join Date: Oct 2008
Location: DFW, TX
Posts: 867
|
Thx. I misspoke with the "bracing" term. My overall impression of the front strut tower bar is that it doesn't offer much improvement on our cars, due to the 1-bolt strut top design and the towers being attached to the firewall. Any mounts out there that actually tie the strut tops, and wouldn't that put a strain on the center shaft?
|
10-12-2009, 11:08 PM | #12 |
Slowy getting there
|
Ummm... The weight of an 18" wheel would kill a Yaris at auto-x. A front sway bar is going to cause more inside wheel spin. Check out this thread about the front sway bar.
http://www.yarisworld.com/forums/showthread.php?t=20049
__________________
|
10-12-2009, 11:11 PM | #13 |
Reluctantly Crouched...
Drives: 2008 Yaris HB M/T Join Date: Oct 2008
Location: DFW, TX
Posts: 867
|
Oh... adjustable shocks are legal, but not lowering springs (in HS).
Anyway...back to the original thread... |
10-12-2009, 11:48 PM | #14 |
Drives: 2008 Yaris HB Join Date: Jan 2009
Location: Syracuse
Posts: 101
|
My car is completely legal all I have is a TRD Rear Sway bar(factory option) and sport exhaust which is allowed
|
10-13-2009, 10:38 AM | #15 | |
Reluctantly Crouched...
Drives: 2008 Yaris HB M/T Join Date: Oct 2008
Location: DFW, TX
Posts: 867
|
Quote:
Same thing goes for your 6.5" wide wheels. Stock class is extremely strict, specifically because the cars are carefully class to be competitive. You are currently being given the most generous PAX index of any car in autocross, but your car has been given a significant handling improvement over your HS competitiors and the rest of the feild by way of your PAX. You wanna win that trophy fair-and-square, right? If you doubt me, post the question on your local SCCA forum. |
|
10-13-2009, 01:25 PM | #16 | |
Drives: street-legal go-kart Join Date: Oct 2008
Location: bowser's castle
Posts: 627
|
Quote:
|
|
10-13-2009, 02:02 PM | #17 | ||
Start another Oil Thread!
|
Quote:
__________________
Quote:
|
||
10-13-2009, 02:04 PM | #18 |
rarer than JDM -1 of 1!
|
If i could add to this topic. I've been solo-ing for 4 years. And in subarus, now that i've blown a motor, i've been racing the yaris for a few events. I plan to run it for the rest of this season, and possibly for the next.
With that said, I now know why Yaris-x is soo fast in his class. His car should be classed in Street touring. In hawaii region, as per scca classing, NO rear sway-bar allowed, as well as aftermarket spring/struts. You can replace your strut, but stock springs must be used. There are a few modifications to be done in H-Stock, and are mostly small bolt-on stuff like axleback exhaust, a front swaybar may also be added or removed. And R-comps (tires) are allowed. That's mostly it. Here's my mods, and it's crappy, but i'm in ST because of them. Blitz intake, TWM SSK/shifter bushings, ultra room bar, and TRD swaybar. THAT'S IT!! I am currently on hankook rs-2's in the front, and primewell's in the rear. I can kick out the rear and spin this car like no ones business! I am getting smoked right now by 2 honda fits, a maxima, and a few other cars in ST. Mods would help i would think, but i'm trying to improve myself as a driver (although to be honest i'm pretty good w/ AWD) trying to learn FWD. Yeah, good tires would help, maybe 20 more HP, some neg. camber upfront and a smidge in the rear. Some toe-out in the rear. But i can't see this car competing against miatas, esp. on tighter courses, which we run in our region a lot. But i guess i will be the only one racing, as you guys will have winter break soon, so i'll post up my results. |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
When did you experience your first mechanical failure? How serious was it? | twowheels | General Yaris / Vitz Discussion | 40 | 08-21-2009 02:38 PM |
anyone else serious about a IQ trade-in this summer | regal | General Yaris / Vitz Discussion | 34 | 06-02-2009 11:29 PM |
Pictures from Autocross at FedEx field in landover MD (autocrossers inc.) | BrazdonW | Photo-Video-Media Gallery | 16 | 04-14-2009 12:29 PM |
Obama topic SERIOUS | Bob_VT | Off-topic / Other Cars / Everything else Discussions | 6 | 12-11-2008 04:16 PM |
Yaris 2001 - serious problem | adnanmalik | General Yaris / Vitz Discussion | 10 | 06-19-2006 08:59 AM |