Jump to content
SAU Community

Can a 1050kg car out brake a 1500+kg r34 gtr?

Intensevil
 Share

Recommended Posts

lou15x Community Regular

lou15x

Posted
Posted

Quote by R33:"Now the heaver car will have more weight on the tyres. This means that more braking force can be applied before lock up. Therefore the heavier car is capable of more braking force before reaching its maximum which occurs just before lock up. It is because of the fact the heavier car can apply more force that it will stop quicker."

Dude, i think what you are refering to is pressure....that because of the extra weight, there is more pressure per square inch of the tire's contact patch compared to the lighter car, and hence should be able to apply more force without reaching the grip limit and locking up.

But i think you forgot to factor in that while there is more weight and pressure on the tires to give it an increased grip limit, there is also that extra weight which will overwhelm the grip as well.

Put simply...if what u said were true.....F1 cars would weigh 10 tonnes and wear 175mm tires.... but we dont see that happening dont we?

dojobi Experienced

dojobi

Posted
Posted

I like R33man's theory. It makes total sense to me, but I'm really not qualified to say if it's right or wrong.

Anyway, just to add some more to the topic, I did an advanced driving course with Ian Luff a year or so ago and he said that trucks can generally brake as well as most cars. This is because of the contact area of the tyres to weight ratio.

Duncan Grand Master

Duncan

Posted
Posted
I like R33man's theory. It makes total sense to me, but I'm really not qualified to say if it's right or wrong.  

Anyway, just to add some more to the topic, I did an advanced driving course with Ian Luff a year or so ago and he said that trucks can generally brake as well as most cars. This is because of the contact area of the tyres to weight ratio.

and there's a great reason to find a different advanced driving school!

Doughboy gave the right answer in the 3rd post, why are we still talkin about it?

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
and there's a great reason to find a different advanced driving school!

not nessasarily.

Your average truck (without the million variables) can brake at approx 75% of what your family sedan can.

so he was sorta right in saying what he did :(

Maybe not 'as well' but it's not 'too far' off

Warpspeed Experienced

Warpspeed

Posted
Posted

Very true.........

Surprisingly one of the hardest things to make brake quickly is a motorcycle. High centre of gravity, and short wheelbase. They are awsome in every way except braking capacity. You would not want to lock the front wheel, or go over the handlebars I think.

I have not looked at figures, but I would not be surprised if a top bike could stay with a formula one car in acceleration, but the formula car would kill it for braking.

Kinks Grand Master

Kinks

Posted
Posted
Regardless of the brakes the tyres will provide a given coefficient of friction (Cf).

Precisely. As mentioned bigger brakes will only mean that you can stop from a higher speed without fade or multiple times without fade. We're assuming the brakes on both cars are adequately sized for at least 1 100->0km/h stop.

Remember the old adage "brakes stop the wheels, tyres stop the car". Small brakes can lock wheels no problem, your braking is limited by the tyre's adhesion with the road until you reach the point where the brakes start to go off.

As for who will stop first, the heavier car will have a bigger contact patch proportional to its weight. The Cf shouldn't change IMO because at a given point on the contact patch the tyre can only push down on the road with a force equivalent to its internal pressure. So the braking gain of the higher car is related to having a bigger contact patch. I think both cars would be fairly similar really.

Busky2k Veteran

Busky2k

Posted
Posted

More weight means more pressure on the tires, and it does seem logical that they would stop better. However the tyre will be under much more stress and deform more, and thus, traction will not increase in a linear relationship with weight.

Half the reason you dont want body roll around a corner is to help spread the load onto the inside tyre. Sure the outside tire has alot more weight on it, and theoretically should hold the road better as you get more body roll but it gets to a point overloaded and looses traction and it ends up worse!

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Butters
      WA PITS: Am I screwed?

      By Butters · Posted

      I'm not up to date on the latest, but for basic modifications like pod filter, lower springs etc you can get a modification permit at the time of inspection.  For more serious modifications you will need engineering.  Intercoolers used to fall into the mod permit rule but its been a long while since i looked it up.   Either way you will be able to get it registered, just a case of $300 vs $3k . 
    • Degzy
      WA PITS: Am I screwed?

      By Degzy · Posted

      Hi everyone! I’m the new owner of a 1996 R33 GTS-T, I’ve purchased this car over from Queensland and brought it to Western Australia and I’ve found that there is a hole cut out in the engine bay for the FMIC that enters into the wheel well (fender liners are in the boot). For anyone that has had to get their car over the PITS here, will this be a major issue?   
    • Ozdavroz
      One of these is not like the others 😂

      By Ozdavroz · Posted

      Yeah I've spotted this one too, whenever it's lotto superdraw week and I'm browsing car sales dot com for my new ride They must be dreaming, maybe it's worth 150k for the link to Brock?
    • Shoota_77
      Shoota's R33 GT-R RB30/26

      By Shoota_77 · Posted

      100% accurate!  We are a pack of know it alls....  But, I bet people go to you when they have a problem! I've been on a bit of a clean up rampage too over the past month!  I've thrown more shit in the bin over the past 2 weeks than I have in the past 3 years combined! Anyway, it's all good fun being different! My wife sometimes does not agree!  
    • MBS206
      Shoota's R33 GT-R RB30/26

      By MBS206 · Posted

      ADHD in all form isn't about "can focus, or can't focus" or is hyper active or isn't etc.   It's all a dysregulation. Either time feels to be stationary, or time just vanishes in a split second. We are either under focussed on the task at hand (as we're over focussed on our surroundings) or we have no idea an atomic bomb went off beside us as we're so hyper focussed and locked in on things.   Not to mention the rapid fire thought process. What it takes a "normal" process to think up a solution to a problem, ADHD will be able to give you 5 different ways to solve the problem, and the pros and cons of each. While we can be highly impulsive and lack the ability to "control ourselves" we can also become paralysed with the inability to make a decision for ourselves. While most of us have an OCD like requirement for perfection, we lack the ability often to remain focussed to get things to a perfect state. Those with undiagnosed ADHD as adults, can often find the last part actually stops them ever attempting to do things that they have the ability to do, as the reasoning is often "if I can't do it perfectly, it's not worth doing"   As for projects... Ha ha ha, I still need to take the other half of my wall trim down in the Fiance's office so I can paint it. Need to finish digging and running the back yard drains, my R33, getting the Ninja bike registered (now being sold), the moped project, fixing either of the lawn mowers so they're reliable, along with a myriad of other things.   It's why I've been going through lately and just being brutal and clearing projects off that I won't actually ever complete. IE, moped will go to the tip, or be given away, bike is being sold, Subaru project being sold, some parts for other projects given away. Or I've been making myself focus on one thing at a time, by ticking off the smallest quickest ones first.   There's also a reason by our mid twenties we seem to be "know it alls", as we've all been down some of the weirdest and oddest rabbit holes when you follow the dopamine trail. It's often also why we're more a jack of all trades, but not a master of one.   However, pretty much all of my hobby projects, in one way or another, all come back around to automotive. That's my zen area.
×
×
  • Create New...