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Old 10-15-1999, 01:18 AM   #1
Apexboy
Scooby Newbie
 
Member#: 343
Join Date: Sep 1999
Location: Bellevue, Wa. US
Vehicle:
1998 Legacy GT
Granite Pearl

Exclamation ABS Braking Techniques

One word of caution while you drive your beast in wet, and eventually snowy
weather, with your AWD system working full time...
*
Read this carefully, and slowly.
*
Imagine your braking power level from 1 to 10 (10 being the strongest "slam").
*
Ignore Level 1 through 5, since ABS won't kick in.
*
Level 6: ABS kicks in, but the braking power isn't that great, so the ABS only releases the "lock-up" of the wheels a little - ABS works only for a moment. (B: Brake/R:Release)
BBBBBBBBBBB R BBBBBBBBBBBBBBBBBBBBB R BBBBBBBBBBBBBBBBB (Hey, ABS is great!)
*
Level 8: You have to stop earlier than "6".* Harder braking, but the wheel wants to lock up more.* ABS is working harder, and the period of wheel release is longer.* Consequently, the wheel is being stopped, but at less power than you want.
(B: Brake / R: Release)
BBBBBBB RRR BBBB RRR BBBBBBBBBBBB RRR BBBBBBBBB RRRRR BB (Whew!)
*
Level 10: You're slamming the brakes, but the ABS is decreasing the braking power since you're inducing more lock-up.* Basically, you're getting as much braking power as "6" or "7".
(B: Brake / R: Release)
BBBB RRRRRRRR* BBBBBBB RRRRRRRR* BBBBBBBBB RR BBBBBB RRRR (Crash!)
*
Are you getting the drift, here?* It means, you want to drive in a way that ABS barely works.* If it's working fully, you're not getting the stopping power you need.* ABS basically eases back on the braking power to avoid lock-up.
*
Now, ABS was created so that you can steer during braking. Here inlies the problem in snow.* Your tires aren't omni-directional, and tires are good in straight motion, but side-ways, the tires are basically
worthless unless designed for such vectoral motion.
*
As such, imagine this.
*
-You've got four people in the car (more weight - greater inertia).
-You're heading for a snow-bank at 40mph (Single vector motion).
-You slam on the brakes (dual vector).
-No lock-up (good).
-You steer (fully depending on the ABS, you add another vector)).
-Tires don't grip well for turning in snow.
-Brace for impact.
-Airbags go off.
*
So, the verdict is...* Even with AWD, the steerability of the vehicle in
slippery conditions is only as good as the tires you run.
*
Best tire choice for snow is: Narrower, and wider tread patterns (to spit out snow faster).
Just remember to drive in a way that you do not invoke ABS fully.
Rain driving is just as demanding - just be careful.
*
The good news is, with AWD, compression braking applies to ALL FOUR WHEELS,
so braking power is distributed evenly.* For FF set-up, the rear is idle,
so it tends to slide out more.* But remember, sideways motion will throw out
a car, no matter what the final drive configuration is.
*
Just a word of caution - as the nasty weather is quickly approaching.*
Remeber that no car is Almighty (maybe a bulldozer...).
*
Forget about the FR cars - they're toast.


------------------
98 Legacy GT (black)
Seattle, WA.
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