The Technical Questions Thread

[NSXType-R]

Can anyone give me a timeline of ceramic brakes? When were they first used if at all in F1 cars?

And did the manufacturers develop it separately?

Thanks.

[RacingManiac]

I though carbon ceramic is a road car thing....F1 cars uses carbon-carbon, which descended from aviation industry...

Not sure what the first street car has carbon ceramics though, 996 Turbo maybe? In which case most likely it might have been a Brembo thing.

[RacingManiac]

Interestingly the current issue of R&T has a little blurb on the carbon ceramic brakes. They mentioned it was first used on production road car in the 996 Turbo and GT2. Carbon-Carbon was first used in F1 in 1976. The ceramics were added to allow for lower temperature effectiveness.

Edit:
Carbon Ceramics - Carbon Ceramic Brakes

[NSXType-R]

Hmm, thanks!

Learn something new every day.

[NSXType-R]

Another random question- is there a reason why F1 cars are still open cockpit other than history?

[Kitdy]

Another random question- is there a reason why F1 cars are still open cockpit other than history?

No. (I think)

[RacingManiac]

Well canopy design isn't exactly straightforward....ingress/egress in the event of an accident still needs to be considered, and their optical property vs material used with something that curvy is going to take some doing as well. And then being closed cockpit too the ventilation and fire safety needs to be considered as well... IIRC FIA has been looking at closing off cockpits but no real solutions yet.

[karabiner98k]

What is the point of using different number of teeth to achieve the same ratio??!

I have seen these two Final Gear Sets:

1) 7x30 = 4.285714285714286
2) 14x60 = 4.285714285714286

What is the difference between these two gear sets in terms of performance and other factors?

If anyone knows, please explain it to me.

[RacingManiac]

Size, stress, packaging...etc?

[drakkie]

Size, stress, packaging...etc?

Not to forget cost. Say you want to transfer 100 Nm, the forces on the teeth will be split by more teeth in the second situation. Thus it requires less strength aka weaker and cheaper material, I'd assume. Logi cal thinking brings me this far anyway

Just get a CVT. In the end I still work for the company that once invented the Variomatic

[karabiner98k]

So, you think less teeth can tolerate more torque. Any other idea?

[karabiner98k]

Hello guys!
Could you help me with this problem?

I have noticed that when my low speed fans turn on, the temperature gauge in the instrument
cluster reads a little higher than the line in the center.



I have seen 3 or 4 cars of the same make and model and checked them that when their low speed fans turn on the temperature gauge reads a little lower than center!



So, by comparison I thought that there is something wrong with my car and my fans turn on later and my engine runs WARMER than normal.

BUT! some days ago something very strange happened!!

I checked the temperature of the engine when low speed fans turn on with the help of a Diagnostic device and noticed that not only my car but also the 4 other cars of the same make and model mentioned above, showed similar results!! The low speed fans in all of them (including my car) turned on @ 96 °C and turned off @ 90 °C!!!!

I can't understand the result of diagnostic data! How can this be possible??!!

If the temperature of my car when low speed fans turn on and off is the same as the others (exacty the same!), why my temperature gauge shows higher temperature in the instrument cluster?!!

I mean when diagnostic data reads 96 °C my gauge is above the center line but other cars were a little below the center line when diagnostic device announced 96 °C for them!!!!

NOW, my problem is that which one is telling the truth in my car?? Diagnostic data or temperature gauge in the instrument cluster?? Is my car really runs WARMER than normal?!!

[RacingManiac]

I'd trust the diagostic tool over the dummy gauge in the gauge cluster. There is a reason why there are no numbers on that...Its not meant to be a reading, rather its a status indicator. Where it sits normally means its "normal" If it goes anywhere near H, it'll be cause for concern, and if it is near C, means the car has not be warmed up yet...

[karabiner98k]

I'd trust the diagostic tool over the dummy gauge in the gauge cluster. There is a reason why there are no numbers on that...Its not meant to be a reading, rather its a status indicator. Where it sits normally means its "normal" If it goes anywhere near H, it'll be cause for concern, and if it is near C, means the car has not be warmed up yet...

Thanks for your answer!

I just want to be sure that my car's temperature is normal and there is nothing wrong with it.

How can I be sure that the diagnostic data is true? Is it possible that Diag. Data is wrong too?!

I'm worried!

I also want to know where does that Diag. Data come from? Coolant temp. sensor?

[RacingManiac]

There is probably a coolant temp sensor(might even be more than one). Some cars might even have an oil temp read out. If you do you might see that reading in the diagnositc tool and the 2 value shouldn't be too far off each other(they will likely to be different though), but the trend should follow.

While its not impossible for the temp sensor to be faulty, its unlikely for it to have a nice even reading if it is broken.