Braking distances

TheDogFather · 16 Jul 2006 at 19:06

The_Dark_Side said:
the fact that the OP said car(S) in plural says to me that he is looking for comparisons.
if i've misunderstood then i apologise.

But what he appeared to be interested in was if it takes 12m to stop from 30 mph, the data was just to satisfy his doubt ?

TDF.

The_Dark_Side · 16 Jul 2006 at 19:10

TheDogFather said:
But what he appeared to be interested in was if it takes 12m to stop from 30 mph, the data was just to satisfy his doubt ?

TDF.

that's not the way i read it.
it appeared to me the OP doubted the stopping distances and wanted similar data on many vehicles as a comparison.
the road surface doesn't come into play as it would effect every vehicle being tested.

Gaygle · 17 Jul 2006 at 00:17

I was just lookin at the highway code and it saying 12meters to brake to 0 and thinkin "eh? that can't be right, i'm sure my car can break quicker than that!". I was simply wondering if there was any website out there that has a list of all different cars and their braking distances from 20mph,30,40,50,60,70mph?

Yeah, in reply to poster above (Dolph i think) i heard it was a very dated set of results.

aztechnology · 17 Jul 2006 at 00:19

The_Dark_Side said:
not a great deal, i was referring to the reasons that 4wd cars that don't always brake as well as their 2wd rivals though.

I agree with that some 4x4 4WD don't stop as well as the average modern saloon, but I'm sure it's to do with their inertia (i.e. they are have a lot of moving mass to slow down) and very little to do with the fact they are 4WD, which is probably what your getting at. I'm sure the stopping distances of something like a 2WD and 4WD audi TT will be near identical

The_Dark_Side · 17 Jul 2006 at 12:15

aztechnology said:
I agree with that some 4x4 4WD don't stop as well as the average modern saloon, but I'm sure it's to do with their inertia (i.e. they are have a lot of moving mass to slow down) and very little to do with the fact they are 4WD, which is probably what your getting at. I'm sure the stopping distances of something like a 2WD and 4WD audi TT will be near identical

unless i'm mistaken the TT isn't permanent 4wd though?
anyhoo that's by the by, the point is when you have both 4wd and 2wd versions of the same car the 4wd version always has larger brakes.
the extra weight of the drivetrain components only comes to the same as a passenger or 2 so an actual increase in rolling mass isn't much of a factor.
it's the fact that the transmission is shunting you along that needs to be overcome.