Hi guys,

I hard HJ Stuck talking about left foot braking the Quattro to keep the boost pressure up in the turbo in the corners. Has anyone tried this in a real vehicle? It seems to be simulated in LFS, but you have to press the throttle all the way to get the turbo pressure to rise; is this realistic?

Thanks!

Quote from George Kuyumji :

2:47 Schumacher brakes early on the outside, and then get the run on JPM on exit. That is what I meant at the top of the post

http://www.youtube.com/watch?v=l6xwLC9Vlkk


The dark blue line is the car that is blocking the inside, he goes more wide then you on exit, the light blue can be you behind him.

Perfect example!

You bring up a very interesting point! It's quite simple, actually.

The driver in front is using a very powerful tactic by staying on the inside. However, he has to slow down enough to keep the car on the tighter radius needed to get around the corner. If you are on the outside, you can brake slightly earlier than normal, drive the right line for the corner behind the car, and time it so you are closing in on the car by the time you've passed the apex to the corner.

Skip Barber points out 'Surprisingly, this doesn't happen very much. Seeing a car drive defensively up the inside tends to befuddly the driver on the outside and more often than not, they give up the passing attempt!'

Just what has happened to you)

Good Luck!

BTW, I posted this in another thread. If the answer to my question is that drivers have set up the car that max pedal pressure = 100% braking, that is kind of like an aid, and certainly unrealistic. It's funny no one has a hint of trail braking, just 0% - 100% instantaneous response. I am very skeptical with regard to this. Schumacher's own braking for a hairpin shows significant trail braking...and that's in an F1 car!

'Looking at the telemetry for the best laps in the XFG, I noticed that all the top laps have seemingly digital braking. The brake pressure goes from 0% to exactly 100% for the needed period and then back to 0%. And all this instantaneous...not a slight hint of lockup or modulation - just 100%! Looking at real telemetry this is never the case, especially in the case of heel-toe, when the foot inevitably loses some of the pressure it is maintaining on the brakes.

Can anyone please explain this phenomenon?'

Vitali

A mechanical engineer was telling me that even if you are on the limit of your braking, engine braking will slow the car down further. You have to discriminate between kinetic energy and potential energy here. Even if your brakes or tyres are on the limit of adhesion (ie. 15% slip), engine braking will help as the energy is not dissipated through the tyres.

The thing is, when you rev match, engine braking is working at its max, also. If you were to blip the engine any higher than the output shaft speed and then engage the lower gear, the car would jolt forward, increasing your braking distance.

Quote from obsolum :

From what I remember from that thread scipy mentioned, engine braking doesn't really help slow the car down if you're already using the brakes to their full extent (ie. the tyres are at their grip limit). So it's pointless. That's it in a nutshell.

Minimaxman, I read in two racing books that a driver only jabs the brakes before a corner if he senses his brakes are fading/close to being finished. One of those books was Skip Barber's the other Alain Prost's.

Hope they were right)

Quote from Minimaxman :

Yeh I'm still not completely convinced the reason they do it is to make sure they've still got brake pressure. What if they did one of these quick jabs only to realise the brakes weren't working, when they come to brake they still won't work.

This is taken from one of the comments from the video NotAnIllusion posted, and sums up what I was getting at in my first post in this thread using the correct terminology:

"My guess is pad knock back. Any lateral movement of the brake rotors can push the pads back into the caliper causing some brake pedal effort being wasted on just moving the pads back into place. In severe cases, it can cause enough knock back so a full pedal press does nothing, requiring another stomp on the pedal. The first time that happens when you're not ready for it is not fun, especially if you're at speed when it happens. Tap the brake down a straight and you reset the pads."


EDIT: When I say I don't think they are checking for brake pressure in my first sentence above, I mean actually checking to see that the brakes are slowing them down, not just tapping them to make sure all the pads are seated properly.

Hi everyone,

Looking at the telemetry for the best laps in the XFG, I noticed that all the top laps have seemingly digital braking. The brake pressure goes from 0% to exactly 100% for the needed period and then back to 0%. And all this instantaneous...not a slight hint of lockup or modulation - just 100%! Looking at real telemetry this is never the case, especially in the case of heel-toe, when the foot inevitably loses some of the pressure it is maintaining on the brakes.

Can anyone please explain this phenomenon?

Vitali