Simviation Forum
/yabb
Real World >> Autos >> A question for you
/yabb?num=1360520699

Message started by Steve M on Feb 10th, 2013 at 1:24pm

Title: A question for you
Post by Steve M on Feb 10th, 2013 at 1:24pm
For many years I have heard these so called experts at winter driving, advising people to let off the gas pedal and turn the wheel into the slide. This of course is true with rear wheel drive. But I've owned all three modes, rear wheel, front wheel and four wheel drive. I haven't owned anything with Sensitrack or computer chip controled traction. With my front wheel and four wheelers I always found that adding a little bit of power would pull the machine out of a spin and decreasing power didn't help much. Of course with rear wheel, decreasing power puts a slight drag on the back end and it will try to follow the front end.
  Let's assume we are on open road and not about hit something. I have thought for quite a few years that these folks are giving incorrect advice. What do you think? I'd love to know..

   

Title: Re: A question for you
Post by ozzy72 on Feb 10th, 2013 at 1:47pm
I've done the skids course at Brands Hatch amongst others and I've always found ease off the throttle, get the wheels into the turn then slowly open up on the gas and you'll get straight.
That said if you're in a BMW 3-series just give it loads of oversteer and hang it through the corners on the throttle... mind you I'm a nutter and not the best person to ask on these things. Too much time spent watching rallying as a kid ;D

Title: Re: A question for you
Post by Steve M on Feb 10th, 2013 at 2:00pm
We pretty much agree then Ozzy, it's not all about letting off the throttle and things will come out allright. As these folks have been advising every  >>Edit:  . I had to delete some of this post after some thought.. ::) If I offended any soccer moms I apologize and think you look great in those yoga pants.  :)

Title: Re: A question for you
Post by Strategic Retreat on Feb 10th, 2013 at 10:48pm
To repeat what the excellent Jeremy Clarkson said not so long ago (few hours ago as I type, in fact) in Top Gear, in a bend rear wheel drive card tend to over-steer and front wheel drive tend to under-steer.

To complete what he said it must be added that at the limits of the envelope, the two kind of cars must be treated differently.

And must be treated differently, in kind, even when loaded differently, but I'm not going there or I'll be writing War and Peace II - the Return of the Cossack, here. ;D

Usually though, when a front wheel drive starts over-steering, like I seem to understand you're wondering, slamming the the throttle close and applying opposite lock only is quite the mistake, because the resistance of the engine braking (which normally is quite useful) will worsen the over-steer no matter how much opposite lock you apply.

I've driven both kind of cars up to the jagged edges of their envelopes and USUALLY when dealing with over-steering front wheel drives (thing that happens mostly because of contaminated tarmac) you should CUT power to the front wheels with the clutch, leaving them to freely spin, and GENTLY apply a degree of opposite lock to recover.

Applying a bit of power instead CAN be as much as useful, but you MUST be able to gauge HOW MUCH POWER to apply, or you will end up only exacerbating the problem and losing control.

This, in fact, poses the problem that if you have an automatic, how you recover is up to the behavior of the gear system. If its clutch releases totally at your cutting the power, you can use the same technique listed above, and if it doesn't (because its advanced system wants to apply engine braking to aid pedal braking, like it is usually done in a manual gear car)... you SHOULD apply a little bit of power, as you hypothesized. The right amount. Which, of course, changes from car to car, from tires to tires, from gear system to gear system, from situation to situation. Just be ready to learn while spinning... which, done in a secure environment, can be quite fun. :D

Generally speaking, that is. :)


PS
Never dealt with four wheel drives. Here in south Italy they're the cars of the bombasts, and I'm quite proud not to be one of them. :P ;)

Title: Re: A question for you
Post by eno on Feb 14th, 2013 at 3:47pm
Unless you are a rally driver applying power or braking in a skid will only make it worse ..... Feet off everything and turn into the skid.

Me, like Ozzy, I've had some rally/skid control training ..... as long as its safe anything with rear wheel drive gets power slid ..... that has included coaches, double decker buses and rigid 28tonne trucks. Front wheel drive let the power off as it causes let off oversteer and will pull the rear wheels into line.

Title: Re: A question for you
Post by Steve M on Feb 14th, 2013 at 7:15pm
Remember now, I mentioned winter driving. Going into a slide on black ice is very much different than sliding on pavement or wet pavement. On ice turning your front wheels into the spin is correct. Speaking from experience, and from actually seeing cars around me go into a spin on ice we just keep spinning helpless unless we get slightly proactive with the throttle. So from my experience with front wheel drive, on ice, in a spin, a blanket statement from all the experts that you just turn in and release the throttle is not good advice. The car will only recover when the speed has slowed enough to allow the tires to grab. And you will need very good winter tyres (tires) to recover at higher speeds. I got out of my slide (on ice with front wheel drive) by using moderate amounts of throttle to coax the car into a forward facing position until the tire treads were  facing the direction in which they were meant to face.

Thanks for the comments and keep them coming! Sideways on ice equals very little traction to be compared to Formula racing.    8-)

Title: Re: A question for you
Post by Ivan on Feb 15th, 2013 at 4:55pm
In most modern cars all handling is artificial. Too much electrics trying to outsmart the driver

With my car:
1: If it is going to skid, stay off the brake, coutersteer and SMALL amount of throttle (or the turbo kicks in @1800rpm and you get 220nm of torque on the wheels) will get back control. What the rear end does depends on the amount of fuel in the tank.
2: Every accelleration and shift will end up in swerving to the right, so be perpared to counter that, especially when you get in the rpm range where you get max turbo effect


For genral use
- Never use large wheel angle changes or you will just throw snow on the roof and go straight ahead.

Title: Re: A question for you
Post by Fozzer on Feb 15th, 2013 at 5:16pm
On my Motor-bike I just stay at home 'till the snow and ice melts...

...or catch a 'Bus!... ::)...!

Paul...Snow is 'sno joke... ;)...!

Title: Re: A question for you
Post by Steve M on Feb 15th, 2013 at 5:39pm

Fozzer wrote on Feb 15th, 2013 at 5:16pm:
On my Motor-bike I just stay at home 'till the snow and ice melts...

...or catch a 'Bus!... ::)...!

Paul...Snow is 'sno joke... ;)...!




How is your foot coming along Fozz?  ;D ;D ;)

Title: Re: A question for you
Post by Fozzer on Feb 15th, 2013 at 7:22pm

Steve M wrote on Feb 15th, 2013 at 5:39pm:

Fozzer wrote on Feb 15th, 2013 at 5:16pm:
On my Motor-bike I just stay at home 'till the snow and ice melts...

...or catch a 'Bus!... ::)...!

Paul...Snow is 'sno joke... ;)...!


How is your foot coming along Fozz?  ;D ;D ;)


All better now. Thanks, Steve!.... ;)..!

It took more than 4 months for the leg and foot swelling to go down!
It was bloody painful for ages. Luckily nothing broken!

In the meantime, I had to ride my smaller, lighter, Yamaha Motor-Bike, instead of my big Honda.
Motor-Bikes are my only means of transport; (no traffic-jams!), just a problem in snow and ice!

Paul...Motor-Bikes since 1950!...(Defying death!).... 8-)...!

The Painful Reminder...(Motor Bike falling onto leg!)...>>> http://www.simviation.com/phpupload/uploads/1361006442.jpg

Simviation Forum » Powered by YaBB 2.5 AE!
YaBB Forum Software © 2000-2010. All Rights Reserved.