How fast can you go backwards?

GM228

Totally random silly question, but curious how fast you can go in reverse?

Presumably the same as how fast you could go forwards in 1st gear before you take the revs off the clock.

(Laws and common sense aside )

*Kol*

If you have the misfortune to spin 180 degrees at high speed you are technically going in reverse albeit it not intentionally!

xabi

depends on the gear ratio, but id imagine its similar to 1st, each car is different

keithclancy

https://www.youtube.com/watch?v=aauRlIuPpSo

Wonder how fast a Honda CVT can go in reverse ?

Bigus

Old rolls Royce silver shadow used to do 54 mph top speed in reverse as an anti kidnap measure afaik/ remember

Bigus

http://www.digitaltrends.com/cars/nissan-leaf-sets-world-record-for-fastest-car-in-reverse/

Depends on the car. They were doing it on mythbusters there a few months ago and got up to a far whack in reverse over 50mph.

GM228

Always reminds me of the opening scene from Naked Gun-driving back from the airport!

s8n

GM228 wrote: »

Always reminds me of the opening scene from Naked Gun-driving back from the airport!

GM228

Why do you feel the need to signoff your posts ??

GM228

s8n wrote: »

Why do you feel the need to signoff your posts ??

Bad habit I suppose, I signoff a 101 letters a day so must be from that!

Would you believe I never actually even realised until you noticed

Squall Leonhart

s8n wrote: »

Why do you feel the need to signoff your posts ??

I have wondered this as well over the last week or two

R.O.R

165.08 km/h

Ant695

Wasn't there a couple of pickup truck type things if one of the F&F films that went a fair clip in reverse and I seem to recall seeing somewhere that they had built them to do that and it wasn't just an editing room trick.

Think they were stealing tankers or something.

s8n

GM228 wrote: »

Bad habit I suppose, I signoff a 101 letters a day so must be from that!

Would you believe I never actually even realised until you noticed

Cool - I always wonder !!

:)

Falcon L

Last 5th gear did a compare piece on the Merc V Jaguar executive saloons. Part of the course was to do a J turn. The Merc did it no problem but the Jag had a limited reverse speed. It couldn't even get up enough speed to do the J turn!

Brasso

Electric cars just invert the current through their motor so they can spin the wheels as fast forward as backwards. They put an electronic limiter on them for this reason but I suppose aerodynamics would give a lower reverse speed than forwards.

colm_mcm

isn't there some car that can go the same speed forwards and backwards. somehing to do with the gearbox?

Alun

colm_mcm wrote: »

isn't there some car that can go the same speed forwards and backwards. somehing to do with the gearbox?

The old DAF's with the Variomatic (aka rubber band!) transmission used to. See Keithclancy's post up thread with the video.

R.O.R

colm_mcm wrote: »

isn't there some car that can go the same speed forwards and backwards. somehing to do with the gearbox?

The figure I posted earlier is the world record speed in reverse.

Caterham Fireblade - as there is no reverse gear with that engine, there's some fancy system to "create" reverse, so it essentially does the same backwards or forwards.

Special Circumstances

colm_mcm wrote: »

isn't there some car that can go the same speed forwards and backwards. somehing to do with the gearbox?

G wagen?


Nope. Dunno where I got that idea... maybe I misremembered the G-Wagen instead of Lambo LM002 and some old italian army "5 reverse gears" joke?

GM228

s8n wrote: »

Cool - I always wonder !!

:)

And I hadn't even realised-force of habit!

Bit of a pleb I feel-doh!

Brasso

Brasso wrote: »

Electric cars just invert the current through their motor so they can spin the wheels as fast forward as backwards. They put an electronic limiter on them for this reason but I suppose aerodynamics would give a lower reverse speed than forwards.

Most tractors have a separate selector for forward and reverse (shuttle). Means you can reverse the same as going forward, change gears etc.

foxy farmer

Amelie Tall Trigonometry wrote: »

Most tractors have a separate selector for forward and reverse (shuttle). Means you can reverse the same as going forward, change gears etc.

John Deeres actually have a higher reverse speed. About 5kmh faster in top reverse gear. Some have an interlock to prevent reverse in the higher ranges.

charcosull

Brasso wrote: »

Electric cars just invert the current through their motor so they can spin the wheels as fast forward as backwards. They put an electronic limiter on them for this reason but I suppose aerodynamics would give a lower reverse speed than forwards.

Unless its a Boxster

millington

R.O.R wrote: »

The figure I posted earlier is the world record speed in reverse.

Caterham Fireblade - as there is no reverse gear with that engine, there's some fancy system to "create" reverse, so it essentially does the same backwards or forwards.

Yea you can get extra gearboxes that go behind standard ones to reverse the motion, used in kit cars sometimes where engines rotate opposite to normal.

9935452

foxy farmer wrote: »

John Deeres actually have a higher reverse speed. About 5kmh faster in top reverse gear. Some have an interlock to prevent reverse in the higher ranges.

New hollands with range command , you cant select the c range in reverse

Brasso

Amelie Tall Trigonometry wrote: »

Most tractors have a separate selector for forward and reverse (shuttle). Means you can reverse the same as going forward, change gears etc.

Interesting. I suppose there's a need for that for certain types of tractor work that require pushing and pulling, which you'd never have the need for in a car.

I was thinking about how the electric cars reverse the voltage or whatever and how it would be possible in a combustion engine. If you could get the engine to run backwards so the output shaft spins the opposite way. You would want a fairly simple engine for that I think (less stuff to wreck) and you would also be sucking air through a small exhaust pipe which would reduce engine performance.

5W30

100 kmh on a Dublin bus.

DFGrange

"How fast can you go backwards?"

Not fast enough to perform a J-turn on a dry surface.

RandomAccess

Eh question, does the speedo work when your in reverse I expect not..

Cos if it did then this thread could really get interesting.

I've never noticed myself for obvious reasons!

power pants

GM228 wrote: »

Bad habit I suppose, I signoff a 101 letters a day so must be from that!

Would you believe I never actually even realised until you noticed

you sign off the other 101 letters with your boards username ?

The Sidewards Man

power pants wrote: »

you sign off the other 101 letters with your boards username ?

Why are you still focusing on a user who signs off on their posts?

The Sidewards Man

mickdw

GM228 wrote: »

Would you believe I never actually even realised until you noticed

I would not believe that.

GM228

When your signing documents/letters all day long you get used to signing off on anything you write such as sticikes, postits, posts here etc, bad habait (or good perhaps?) and nothing more and yes it's something I do without really realising, perhaps it's just me? And I don't always use my username, sometimes I even us my own name (hope no letters out there doing the rounds wth GM228 signoffs ).

I suppose you could call it a professional courtesy!

Why does it matter so much anyway?

Big Nasty

RandomAccess wrote: »

Eh question, does the speedo work when your in reverse I expect not..

Cos if it did then this thread could really get interesting.

I've never noticed myself for obvious reasons!

Ever see Ferris Bueller?