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-   BRZ First-Gen (2012+) — General Topics (https://www.ft86club.com/forums/forumdisplay.php?f=23)
-   -   Oversteer during overtaking (https://www.ft86club.com/forums/showthread.php?t=75509)

Roarke 10-07-2014 11:20 AM
Oversteer during overtaking
 
Hey guys,

I had some strange behaviour which never happened to me with other cars. I would like to explain it, but my English is far from perfect, so hope Ill do it right ;)

First,m I know that it was my fault and it was a dangerous maneuver ;( So please dont punish me, my wife already did it ;)

Basically, I was driving on highway around 140Km and a little bit in hurry ( i know, whole accident was because of this) .. So I was in left lane, behind slow car and very close (because he didnt want to return to right lane).

When he began return back to right lane, I begin accelerate (slightly). When I was on the side with him (something like my nose in his center) , my car oversteer to the left. I was really surprised, crash barrier was so close, car oversteered to the left, my wife screaming. So I stopped accelerate and brake a little bit.. and luckily get grip again. Anyway, nothing what I would like to experience again.

I assume, that because I accelerated, I had more grip on rear wheel and wind from second car break grip for front wheel and car begin skid...

do you have any experience with something like this ?

Best
Roarke

jvincent 10-07-2014 11:40 AM
When you say the car "oversteered to the left", do you mean it started to drift to the left?

Oversteer usually means the back of the car turns faster than the front. It sounds like you were going is a straight line and the car just started to drift.

Roarke 10-07-2014 11:48 AM
Quote:
Originally Posted by jvincent (Post 1974933)
When you say the car "oversteered to the left", do you mean it started to drift to the left?

Oversteer usually means the back of the car turns faster than the front. It sounds like you were going is a straight line and the car just started to drift.
Its hard to explain with my English. The car didnt move to the left without changing direction. it begin turning to the left and it was oversteer IMHO.. the back definitely wanted to overtaking front ...

AdrianG 10-07-2014 12:18 PM
You probably hit some oil on the road or something to make you lose traction. At 140+ km/h you would have to at least try and induce a slide in regular conditions.

- AdrianG

aznatama 10-07-2014 12:27 PM
So let me get this straight... you were tailgating, the car moved over to the right, and you sped up going straight, then the car felt like it turned to the left?

Probably a combination of wind turbulence and some slight loss of traction due to road conditions, or you just hit a dip or tracked a rut in the road that you didn't see.

You don't "oversteer" going in a straight line, unless you were cornering and the rear slid out.

Roarke 10-07-2014 02:32 PM
Quote:
Originally Posted by aznatama (Post 1974995)
So let me get this straight... you were tailgating, the car moved over to the right, and you sped up going straight, then the car felt like it turned to the left
This, except it didnt feel, but really turn left (without feedback on steering wheel)

jvincent 10-07-2014 03:16 PM
If you weren't moving the wheel then the only things that could have caused you to move that much would be something on the road (water or oil) or a dip or bump in the road that cause the car to bounce which made it seem like it turned.

140 KMH isn't fast enough to have an aero induced lack of traction.

unlimited86 10-07-2014 03:22 PM
Quote:
Originally Posted by Roarke (Post 1975140)
This, except it didnt feel, but really turn left (without feedback on steering wheel)


Happen to me in the rain before..thats rwd for you. You could of hit an oil patch or something and slightly broke traction in the rear, just ease ease off gas a little and you should be fine.

paulca 10-07-2014 03:49 PM
Did you hit a sharp bump in the road?

ZionsWrath 10-07-2014 04:04 PM
There was a skunk in the road and since the opposite lane was clear I decided to dodge it. The TC kicked in hard, not sure why I wasn't THAT aggressive lol.

But since you didn't lane change I don't know what happened

paulca 10-07-2014 04:08 PM
Why do I have a vision of you in court saying,

"There was a skunk in the road and ....."

"Your honor...."

ZionsWrath 10-07-2014 04:12 PM
wtf it was 6 am no one in sight either direction, just mr stinky

Roarke 10-07-2014 04:20 PM
No bump or something.. I still think that it was because aerodynamic wind from second car...

Anyway thanks for input ;)

ashtray 10-07-2014 04:41 PM
Are your rear tires worn out?

luelanski 10-07-2014 06:14 PM
The Brz can overtake cars?

carma143 10-07-2014 10:00 PM
Quote:
Originally Posted by luelanski (Post 1975478)
The Brz can overtake cars?
Ha ha. But ya. if my dad's 3100 lbs 110 bhp car can overtake, the BRZ most cetainly can.

ashtray 10-08-2014 02:26 AM
Did you downshift and dump the clutch?

Ultramaroon 10-08-2014 02:47 AM
Quote:
Originally Posted by ZionsWrath (Post 1975286)
wtf it was 6 am no one in sight either direction, just mr stinky
poor mr stinky

nikitopo 10-08-2014 06:27 AM
Quote:
Originally Posted by Roarke (Post 1974923)
Hey guys,

I had some strange behaviour which never happened to me with other cars. I would like to explain it, but my English is far from perfect, so hope Ill do it right ;)

First,m I know that it was my fault and it was a dangerous maneuver ;( So please dont punish me, my wife already did it ;)

Basically, I was driving on highway around 140Km and a little bit in hurry ( i know, whole accident was because of this) .. So I was in left lane, behind slow car and very close (because he didnt want to return to right lane).

When he began return back to right lane, I begin accelerate (slightly). When I was on the side with him (something like my nose in his center) , my car oversteer to the left. I was really surprised, crash barrier was so close, car oversteered to the left, my wife screaming. So I stopped accelerate and brake a little bit.. and luckily get grip again. Anyway, nothing what I would like to experience again.

I assume, that because I accelerated, I had more grip on rear wheel and wind from second car break grip for front wheel and car begin skid...

do you have any experience with something like this ?

Best
Roarke
Small bumps or road imperfections can cause this behaviour. I don't believe BRZ's strong point is on the highway. The suspension is too stiff and sometimes causes the car to bounce even in relative medium speeds (i.e., 140 km/h).

I have a STI suspension in my forester and it is way more compliant for highway driving. The car doesn't bounce at all! Overall, I feel much more confident to go with 180+ km/h with my forester than with my BRZ. Of course, forester's suspension is not so stiff.

stonenewt 10-08-2014 06:33 AM
Quote:
Originally Posted by nikitopo (Post 1976129)
Small bumps or road imperfections can cause this behaviour. I don't believe BRZ's strong point is on the highway. The suspension is too stiff and sometimes causes the car to bounce even in relative medium speeds (i.e., 140 km/h).
Stiff suspension doesn't cause this but over damping, & lack of suspension travel, does. :mad0259:

nikitopo 10-08-2014 07:20 AM
Quote:
Originally Posted by stonenewt (Post 1976135)
Stiff suspension doesn't cause this but over damping, & lack of suspension travel, does. :mad0259:
I was replying to this guy with simple words, because he said his English are not very good. Bouncing is not the most accurate word. If you want to be more accurate, I wanted to say that wheels are losing easier the contact with the road. In some cases, they are losing contact all of them and this resembles a bounce. Fact is that BRZ or its variants are not for highway driving in high speeds. Personally, I feel more unsafe with the BRZ than with my Forester. Of course, in the track it is another story because over there you don't have so many imperfections. Besides, power is limited and you'll hardly manage to go even in a track with more than 170-180 km/h. Now, if this is an issue of the stiffness or because of something else it is another discussion. A lot of people have a definite opinion about stifness and think that it is always good. This is not always the case. There are always trade offs. And don't forget that I'm mentioning my experience with the new BRZ model which has a revised suspension.

.


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