Re: Bill's Thread "Going Down Through the Gears, 5 Litre Style"

[JabberWocky]

Missed the previous thread and this one seems to be solved but,

Indycar drivers (who use a h pattern) go straight to what ever gear they want cos it is faster. They change to the gear they want to come out of the corner in. Much quicker braking and like what has been said, they are on the threshold anyway so how can they brake any harder ??

This is proven when driving my car. I recently bloew a small hole in the diaphram in the brake booster so as a result I have non assisted brakes atm. (and the pedal feels so much nicer to drive with). I noticed after doing it that when I went down a gear you could feel the car pushing the brakes harder and hence had to brake harder to slow down. IN comparison to not using the engine to brake.

But, on do assume that, like what was said, using the engine to brake would be more efficient as you don't need to use the brakes as much. But is doing this worth the extra fuel and stress on the motor ... or should that be in another thread ???:D

Cheers

Jabber

[Merry Vanly Stan]

Originally posted by baggins
gears are for going, brakes are for stopping.

I would rather get a new set of discs and pads over a gearbox or engine rebuild anyday! If your brakes aren't up to the job, then it is quite obvious what needs attending, even a small outlay of some decent pads is affordable.

hrt probably cares more about performance than the number of gearbox rebuilds.. if they can stop 0.002 seconds quicker and that means having to rebuild their gearbox after every round (which they were probably going to do anyway) i reckon they'd be doing it..

[old baggins]

Originally posted by dan
hrt probably cares more about performance than the number of gearbox rebuilds.. if they can stop 0.002 seconds quicker and that means having to rebuild their gearbox after every round (which they were probably going to do anyway) i reckon they'd be doing it..

I was referring to a street car, hardly a comparison to draw against HRT.

[Evaku8]

That is awesome, I bet you couldn't believe the man himself called. Good on him for taking the time to answer your question. I have to say HRT aren't my favourite team, but if this is any indication about how they run their team, then no wonder they are so far in front.

Great work by Mark and HRT.

[Merry Vanly Stan]

Originally posted by baggins
I was referring to a street car, hardly a comparison to draw against HRT.

true, but we are discussing why hrt goes down thru the gears, not a street car! so comparing it to a street car isnt really a fair comparison

[old baggins]

Originally posted by dan
true, but we are discussing why hrt goes down thru the gears, not a street car! so comparing it to a street car isnt really a fair comparison

jesus, dude, read the post that I replied too?!?!?!

[No-Logic]

Indycar aka CART use Sequential shifts...

Originally posted by JabberWocky

Indycar drivers (who use a h pattern) go straight to what ever gear they want cos it is faster.

[JabberWocky]

No Logic: I stand corrected but when I saw the interview, with Paul Tracy it was about two years ago and he said thats how they brake and I assumed h pattern to do so but I suppose they still have a clutch (don't they ?) and would still be able to do it with a sequential box anyway.

Cheers

Jabber

[Kangz]

Originally posted by JabberWocky
No Logic: I stand corrected but when I saw the interview, with Paul Tracy it was about two years ago and he said thats how they brake and I assumed h pattern to do so but I suppose they still have a clutch (don't they ?) and would still be able to do it with a sequential box anyway.

Cheers

Jabber

No clutch.

[JabberWocky]

Are you guys absolutely sure about this. I'm 99.9% sure I remember seeing them physically change the gears from camera shots and if no clutch how can they not stall the motor when they spin. Did this all change in the recent few years ??? I thought that was one of the majors that made them different from the f1s: clutch, gearstick (no paddles or sequential), steel brakes and no carbon fibre in the body. I must admit though, I haven't been paying much attention to it lately..

Cheers

Jabber

[No-Logic]

They def have sequential shifting, tho its operated manually using the gearstick, up = down, down = up. The way its MEANT to be I hate Sequential shifts where up is up a gear..stupid.

Anyway, I think there is a button that engages neutral or they pull the stick up or something. It could even be R-N-1-2-3-4-5-6-7 and they engaged N by going thru the cogs.

[FeTt]

Jabberwocky : The sequential gearbox as used in CART does not have electrohydraulic clutch/shifter operation like you see in F1. CART gearboxes are a conventional sequential box as found in many forms of motorsport, they are a purely mechanical device and use a clutch just like any road car. (although the clutch is often not needed when shifting between gears)