Simviation Forums

two topics in one really so help always appreciated.
Firstly, Watching some videos of a both a V8 car being driven and a Nascar being driven by Montoya, on both cases on the upshifts niether used the clutch with the exception of pulling away. Now I know you can change gear without a clutch but everything I have read suggests you need to drop the rev's then steady them before doing it. But in both cases these guys had their foot flat to the floor when upshifting. Any idea's?

Secondly just watching an old top gear with Clarkson testing the ascari A10 with its sequential gear box. It appears on the upshifts he's just pulling the stick as you would in most, but on the down shifts it appears he's using a clutch pedal. Again, is this one of the standards of this type of gear box or is it just a trick of the light and maybe he's just reacting to the braking or something?

As for the Ascari A10 with its sequential gear box, you need to look no further than motorbikes (though Fozzer would be a better person on this subject), they have aways had sequential gearboxes. The top racers never use the clutch to change up, it is time lost in the power train and that translated to lost time in a lap. If you watch them, they only use the clutch to change down. In my bike days................before I got married, I use to change up without the clutch, not so often, it was a road machine and not a racer. I see no reason why a sequential box in a car could also not be used in such a fashion. Also, you have no idea what come CPU is doing in the back ground. Foot flat to the floor, reach a set RPM and a computer controlled clutch does in a millionth of an eye blink what would in comparison take a driver three days to do. Just watching what the driver does today no longer gives you a complete picture to how one of these cars operate (unfortunately)

Matt

In my old Brooklands 1931 Riley 9 Car with its "crash-type" silent 3rd. gearbox, where each toothed gear had to be physically meshed with the next gear, it was necessary to carry out what is referred to as "Double De-clutching" between changing gears.

This necessitated depressing the clutch, changing into neutral,  releasing the clutch, allowing the revs to settle and the gears to slow down, depressing the clutch again, and changing into the next gear.

This was necessary in both upward and downward gear changes.

The practice was also common on old Lorries (Trucks).

Modern gearboxes contain syncro-mesh gears using "dog clutches", (where the gear teeth are constantly in mesh), rendering this practice unnecessary nowadays.

A definite technique, and loads of fun...especially under racing conditions...in old cars.........and old Lorries!.. ...!

Paul... ...!

You don't need a clutch to change up or down.

In the dim and distant past when gearboxes didn't have syncromesh,

In my time in the British Army....long, long ago...thankfully...

My  old Army petrol Scammell tractor unit, tank transporter, and my old Bedford QL and K3 3-ton Lorry, and my old Coventry-Climax 1/2 ton electrical generator Unit with its wooden cab and perspex windows, all required double de-clutching their gear boxes during gear changes.....

With central, cab mounted gear boxes, many of the gear-shift levers were located BEHIND the driver!

...Gear changing was a VERY long-winded, body twisting, and time consuming process...

...trust me......!

(Quite good fun tho'...at the time!)

Paul....REME....BOAR....distant past...

In my time in the British Army....long, long ago...thankfully...

My  old Army petrol Scammed tractor unit, tank transporter,

I think you mean Scammell. Scammed has a slightly different meaning.

Was it anything like this? http://www.youtube.com/watch?v=qFUurpWn3Gs&feature=related

In my time in the British Army....long, long ago...thankfully...

My  old Army petrol Scammed tractor unit, tank transporter,

I think you mean Scammell. Scammed has a slightly different meaning.

Was it anything like this? http://www.youtube.com/watch?v=qFUurpWn3Gs&feature=related

Sorry Doug....my Typo Error....

...distant memories and general confusion... ...!

Yep...that's the one!.... ...!

The "Petrol" Scammell engine/bonnet was much larger than the Diesel version...VERY inpressive... [smiley=thumbsup.gif]...!

I loved it to bits....hauling Centurion Tanks down the German Autobahn!.... ...!

Paul....getting scammed, on occasions... ...!

... ...!

The Jerico transmission is used in NASCAR, also in drag racing. It is designed to allow shifts without clutching, although some old-timers like Mark Martin still clutch-shift.
I have an old 1975 C-10 pickup/ute which can be shifted up and down without clutching.

My advice to you:  Stop watching NASCAR

[quote]My advice to you: