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Old 06-25-2009, 12:37 AM   #1
Scooby South
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Default Throttle off oversteer....08 STi STU

What is a good way to get rid of Throttle off oversteer...
08 STi for STU competition....STU Tune on Sport Sharp....Diff is 0 traction control on or off...doesn't matter..:/...Coilovers...STock Sways....Camber...still on stock Dunlaps...seems to happen more on the transition stuff....in particular ....Slaloms...or any sweeper turn where you have to let off the gas...


Any ingenious ways to get rid of it????

Thanks
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Old 06-25-2009, 01:16 AM   #2
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32mm front bar....
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Old 06-25-2009, 01:32 AM   #3
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keep your foot on the gas!
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Old 06-25-2009, 01:43 AM   #4
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who makes the bar?
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Old 06-25-2009, 01:45 AM   #5
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Keep your foot in it...
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Old 06-25-2009, 01:58 AM   #6
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Niles makes custom bars. I dunno if he's here, but I know he's on IWSTI. I had a 32mm front bar on my STi when it was in AS, and I know he makes them for GR/GH's as well.

(Not that I was serious about him getting one, just that it would fix that oversteer problem up right quick)
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Old 06-25-2009, 07:24 AM   #7
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Niles is local to me. Last I knew, he still had barstock in the garage and the jig still tacked up on a table..... He's been really busy with work and school, as well as getting his trackwhore sorted, so timely responses may not happen consistantly. I'll pass along the word to have him make another couple bars.

Jay Storm
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Old 06-25-2009, 09:33 AM   #8
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In all serriousness my old WRX with a 6-speed swap was the most tail happy car ever. I was even going to enter it in drift events but someone told me AWD wasn't allowed.

I'd learn to drive with it. If you can't then set some toe in
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Old 06-25-2009, 10:48 AM   #9
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so....to summarize....

-A Bigger Front bar...
-keep your foot in it...
-dial in some rear rebound
-Dial out some some front Compresson
- rear toe in
-Alignment check...(front -3.5 about 1/4 toe out... -1.2 rear, 0 toe )

Ok...this only happens when you lift....to say to enter a slalom, or heavy transitions....where you lift to Set the car....

Bill
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Old 06-25-2009, 11:20 AM   #10
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Quote:
Originally Posted by Scooby South View Post
Ok...this only happens when you lift....to say to enter a slalom, or heavy transitions....where you lift to Set the car....

Bill
My advice Bill. Just catch it an go! Drive a miata, then drive that STi again. You'll quickly learn how to catch oversteer early and get back on the skinny pedal.

I see lift throttle oversteer as an excellent thing for any awd/fwd car. Damn - wish I could have made my former DS WRX handle like that!

P.S. +1 on adding slightly more rear rebound and/or adding some rear toe in.
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Old 06-25-2009, 12:17 PM   #11
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We used to have that problem on my old 06 STI - a bigger front bar was the solution.
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Old 06-25-2009, 02:04 PM   #12
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Quote:
Originally Posted by BlkWRXWag View Post
We used to have that problem on my old 06 STI - a bigger front bar was the solution.

Thank you sir...Exactly what I was looking for......no way to get it before sun I guess.... oh well


Thanks again...

Bill
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Old 06-25-2009, 02:06 PM   #13
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Quote:
Originally Posted by Splash View Post
32mm front bar....
perfect..
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Old 06-25-2009, 02:09 PM   #14
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Having said that, it was fast if you could catch it! However, the odds of a clean run were slim. Every time you lifted off the car wanted to spin. When my codriver Aaron took his first run in the car, I think he spun in it within the first 200 yards

Braking and turning were just impossible though if a course required it. This was with the stock FSB. I replaced it with the Cobb 25mm hollow and the problem went away.
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Old 06-25-2009, 02:14 PM   #15
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Snap oversteer has been commonly a trait of the open/viscous cars and largely went away with the STIs. However, odd setups can exacerbate the issue even with good diffs. The 03 WRX we are setting up has snap oversteer and we are trying to eliminate it (and have been unsuccessful so far). I'm told it is needed to make the car rotate. The 06 STI we are setting up had snap oversteer but we eliminated it. It can use the diffs to make the car rotate.

If you are dealing with a lift snap, it is typically caused by instantaneous loading/unloading of the tires. This translates into rear rebound, front compression, front spring, and front or rear bar. More rear rebound limits the weight transfer from the rear. More front compression limits weight transfer to the front. More front spring limits weight transfer to the front. More front bar limits weight transfer to the front. Less rear bar limits weight transfer from the rear. Keep in mind that rebound, compression, and bars are for lateral transitions (slaloms/offsets), and springs are for constant loading (sweepers) or longitudinal transitions (braking/accelerating).

I didn't notice the snap on my 08 STI, but it is a very premature build with lowering springs and bars so far. The 08 STI, specifically, will add camber and toe-in when weight is transferred to it. If you have excessive body roll, you may be significantly decreasing camber and going toe-out.
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Old 06-25-2009, 02:17 PM   #16
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Quote:
Originally Posted by BlkWRXWag View Post
Having said that, it was fast if you could catch it! However, the odds of a clean run were slim. Every time you lifted off the car wanted to spin...

Braking and turning were just impossible though if a course required it.
I agree with this. It is a little unsettling when you have to worry about when you hit the brakes or if you can catch it fast enough as it rotates through the slaloms. Fast, though, if you stay ahead of it. The lifting/braking is what deters me from this setup. It is ok if you can hit the gas to smooth out the transition- braking doesn't exactly settle it.
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Old 06-25-2009, 02:22 PM   #17
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Nightmare scenario - fast curving entry into a tight slalom!

I lost the Atwater Tour a few years ago, as the car simply could not get into that slalom without going sideways!

Last edited by BlkWRXWag; 06-25-2009 at 02:27 PM.
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Old 06-25-2009, 02:25 PM   #18
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Quote:
Originally Posted by stimpy View Post
Snap oversteer has been commonly a trait of the open/viscous cars and largely went away with the STIs. However, odd setups can exacerbate the issue even with good diffs. The 03 WRX we are setting up has snap oversteer and we are trying to eliminate it (and have been unsuccessful so far). I'm told it is needed to make the car rotate. The 06 STI we are setting up had snap oversteer but we eliminated it. It can use the diffs to make the car rotate.

If you are dealing with a lift snap, it is typically caused by instantaneous loading/unloading of the tires. This translates into rear rebound, front compression, front spring, and front or rear bar. More rear rebound limits the weight transfer from the rear. More front compression limits weight transfer to the front. More front spring limits weight transfer to the front. More front bar limits weight transfer to the front. Less rear bar limits weight transfer from the rear. Keep in mind that rebound, compression, and bars are for lateral transitions (slaloms/offsets), and springs are for constant loading (sweepers) or longitudinal transitions (braking/accelerating).

I didn't notice the snap on my 08 STI, but it is a very premature build with lowering springs and bars so far. The 08 STI, specifically, will add camber and toe-in when weight is transferred to it. If you have excessive body roll, you may be significantly decreasing camber and going toe-out.
That puts things in a better perspective for me....thanks..so either way your trying to limit to Transitional forces to be more predictable....or better yet so the car doesn't get upset when these transitions occur...so essentially, Any of the above will have a greater effect on Results, be it better or worse...

I See..Thanks...I was trying to figure out what was going on...now when the car is on power and in transition...it handles with a slight understeer, but ease off the go pedal..and the backend wants to swap ends...not violently but a gradual motion...IE: Slo-mo Spin...

thanks again

Bill
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Old 06-25-2009, 02:25 PM   #19
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Quote:
Originally Posted by BlkWRXWag View Post
Nightmare scenario - fast curving entry into a tight slalom!

I lost the Atwater Tour a few years ago, as the car simply could not get into that slalom with going sideways!
EXACTLY.....same type of scenerio
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Old 06-25-2009, 02:26 PM   #20
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Quote:
Originally Posted by stimpy View Post
I agree with this. It is a little unsettling when you have to worry about when you hit the brakes or if you can catch it fast enough as it rotates through the slaloms. Fast, though, if you stay ahead of it. The lifting/braking is what deters me from this setup. It is ok if you can hit the gas to smooth out the transition- braking doesn't exactly settle it.
Yep....Same...
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Old 06-25-2009, 05:01 PM   #21
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Quote:
Originally Posted by BlkWRXWag View Post
Nightmare scenario - fast curving entry into a tight slalom!

I lost the Atwater Tour a few years ago, as the car simply could not get into that slalom without going sideways!
Max,

Left foot braking is your friend. =0

-Paul
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Old 06-25-2009, 05:04 PM   #22
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Quote:
Originally Posted by AtomicRacer View Post
Max,

Left foot braking is your friend. =0

-Paul
I'm not that talented!
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Old 06-25-2009, 10:08 PM   #23
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slow down more earlier and then power out of it? you can't just keep on it everywhere.
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Old 06-25-2009, 10:31 PM   #24
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so Bill you have a new STi ?
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Old 06-25-2009, 10:38 PM   #25
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Quote:
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I'm not that talented!

All you gotta do is push the middle pedal. It's easy.

Keep in mind, a vacuum assisted braking system won't work well at WOT, so you can really stomp on the brakes.
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