I am assuming that if the tires have enough grip, and the car is going fast enough. The intertia of the wheels and car would overcome the grip that the brake pads have on the brake rotor. That is only my hypothesis, don't hurt me.
I am assuming that if the tires have enough grip, and the car is going fast enough. The intertia of the wheels and car would overcome the grip that the brake pads have on the brake rotor. That is only my hypothesis, don't hurt me.
So you are testing engine braking? Did you play with the engine braking settings on the BF1? That will have a big effect on the results.
Also, wasn't Nick's comments about the actual braking and not the engine braking? His comments seem to correlate nicely with LFS as the high downforce cars are very easy to lock up at lower speeds because of the high brake settings you can use effectively at higher speeds because of the downforce.
The engine brake reduction was set to 0. The downforce to almost max.
I also think Tristan is right about that the drag probably isn't right. When coming out of a slipstream, it's so easy to pass the one your were slipstreaming even before the corner. You keep your speed when you come out of the slipstream. And I think that the slipstream is still too big..
Heidfeld's commend was indeed about the normal brakes I think.
I'll test it again in hotlap, so I can show the graph's between the road car and the F1 car.
EDIT: Here you go. The cyan coloured line is the BF1. The red line is the XFG.
-1.26 G for the BF1, -1.16 G for the XFG.
I'm talking about the linear velocity of the edge of the tyre, in absolute terms (assuming a non-moving planet and stellar bodies, thanks Storm Cloud).
All I am saying is that, at twice the speed, you have four times as much energy to remove from the wheels before maximum braking will begin. Of course you will be braking harder and harder throughout this phase, but this still increases your stopping distances and makes the wheels harder to lock.
Hence brakes that slow wheel quickly at low speed may not slow the wheel quickly enough at high speeds, and locking the wheel at high speeds becomes much much harder (although this is a good thing really).
blah
not exactly
but i am too tired to explain. has to do with the rate at which you reach maximum pressure on the brake pedal, the amount of energy that needs to be dissipated at the brakes and its relation blaaaah i'm bored...
not exactly
but i am too tired to explain. has to do with the rate at which you reach maximum pressure on the brake pedal, the amount of energy that needs to be dissipated at the brakes and its relation blaaaah i'm bored...
Why do you think inertial forces are negligable when it comes to how easy it is to lock a wheel? Please explain, with your maths if possible.
i dunno man, you beat me
Regardless of whether your physics say it *shouldn't* be harder to lock the wheels at high speed, the fact that a few people on here who are racing drivers in real life say it definitely *is* harder makes me inclined to think there's something wrong with the calculations, rather than reality itself.. 
uhhh at higher speed it is indeed harder to lock the brakes (we're talking about a car without downforce and usual/normal/road brakes).
If break help is off, then try raising the brake force in the brake settings while in the pits.
I keep my brakes set to, in the XRG: 1200 Nm, in the FBM: 800 Nm per wheel and have no problem locking the brakes if i really wanted to.
Why? Road friction makes wheels spin, as you reach a certain slip ratio that contribution stops being sufficient. But the brakes' ability to convert kinetic energy into heat is limited, so even if you put the pedal to the floor, it will take longer to lock the wheels at 300 kmh (since the initial KE was so high to begin with), and if locked, just a slight lift off the brake will fix the situation. Of course you could argue that brakes are slightly more efficient at high speeds since they are cooled faster, but I doubt it matters that much.
If you are talking about high speeds and having the brakes lock, then that is because LFS allows you to put silly high braking force values on the car. Real cars won't lock up at high speed no matter how hard you press on the brake. Try it in your passenger car. Get up to 60 or 70 mph and mash the brakes. You won't start feeling the ABS until you are slowed down to something like 40ish mph (assuming you have decent tires). I would say start at a higher speed, but that would be unsafe and illegal unless you were at a track.
If you put on a big brake kit, you will have more brake force available and then you might be able to lock the tires from a higher speed. You have to be very careful with this though since that starts getting very dangerous.
The best brake setup is one in which the tires will be at an optimal slip angle range when you apply full braking power at you highest expected speed and then the driver or ABS will have to modulate the brakes as the car slows down.
that's what i'm saying
Sorry I have a Miata with no ABS, its a really light car and can lock up at 60 to 80 MPH. Personally, I like really strong brakes with very low power assist.
It makes for more sensitive brake control, which makes driving more fun.
Thats because of those itty-bitty skinny tires you use on that tinkertoy car
.Yes, there are exceptions and yes, you can put more brake on a car than is necessary or wise (I'm not saying you have, btw). Still, LFS allows you to put on so much brake that you can lock up at full speed with minimal brake pressure. That is a bit silly, but I suppose it could be done in real life too.
BTW, how do you reduce the boost? I am wanting to do that to my track rat too.
Oh I'm sure I have more brake force than necessary, or wise for that matter.
Reduce boost? Now why would you want to do that? What car do you drive at the track? Do you have a Mazda Speed Miata? I am not sure how to reduce boost. I think it has something to do with the waste-gate.
Sorry, wrong words. How do you reduce power assist on the brakes? Do you put a restrictor in the vacuum line or do you just replace the whole brake booster.
I have an 87 BMW 325is (E30) track rat. The engine is completely disassembled right now while I work on the rebuild. Stupid PO who didn't change oil.
Why would you do that? Do you want to be standing on your brakes every time you try to stop? It's better to have vacucme assist.
He doesn't want to remove pressure booster, he wants to lower the brake pressure a bit, sounds sensible for a track car, because you never want the brakes to lock from a slightest touch
Really? I've driven several cars with no abs, few times had hard braking, few years ago from almost 140kph (~85 MPH) and tires locked all the way to zero kmh. Car in this case is Renault Clio 1.5dci (65HP) ~1000kg
Also recently, I braked from little over 100km/h (60mph) and wheels locked totally - tires on the car were around two weeks old. This here is Renault 19 1.4 (72HP), 930kg...
So i think your statement isnt quite right.
Like it was explained in above posts, it may vary, it may depend on such factors as width of your tyres, weight of rims etc
Or, if you manage to lock your tyres all the way from 85mph to 0, a complete lack of talent (or mechanical sympathy).
Of course it's possible to lock brakes from any speed - it's only applying some friction to overwhelm the tyre friction. But it is a LOT harder to do it at speed than it is at jogging speed...
Of course it's possible to lock brakes from any speed - it's only applying some friction to overwhelm the tyre friction. But it is a LOT harder to do it at speed than it is at jogging speed...
jesus christ. i hope you are either joking or testing something.
or, at least, learn to brake!!!
First situation 85 to zero - COW went onto the road. Luckily missed it and slowed down in time...
Second sitation, happend last week.
Im driving my way home, tired after work. Open road, not city. Coming to a junction, I'm on the main road. And coming into it, I see what. A car driving form the left side. What should I do? i just stomped on the brake pedal. In the last few meters, just moments before we should crash, he stopped completely, I was still sliding on my locked wheels. I released the brake and went around him. And the again stomped on it.
Infact I know really good how to threshold brake, and heel n toe very good. I'm actually forced to use heel n toe, because shifting from 3rd into 2nd in my r19 is impossible without throttle blip.
But in a situation i described above you are just not prepared and you arent "awake" enough to react properly. Ive mentioned it just to correct someone saying it is impossible to lock wheels on normal cars...
sorry for the offtopic.
Wouldn't you stop faster if you DIDN'T lock up the brakes?
Abs?
(81 posts, started )
FGED GREDG RDFGDR GSFDG