Just nailed a tree....Oops!

I'm guessing the other big factor is that there is no road resistance? Right?


You seem to love trying to rip into people and prove them wrong Mr Firestar. ;)


Got any pics of the car now Tesla? It's surprising how such low speed incidents can cause so much damage. :(
 
Scarfacé said:
You seem to love trying to rip into people and prove them wrong Mr Firestar. ;)
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Whilst i don't agree with the idea in principle, everyone has seen someone do a burnout at some point, my major point of disagreement was achieving off the clock figures stated at 150mph in a Xsara, i do admit i may have been slightly upfront yesterday about that so i'm sorry about that PMKeates but i still find the quoted speed hard to believe.
 
There's no wind resistance if you're just spinning on the spot, which is what slows you down when moving normally. Remove that and you're basically just limited by gearing.
 
yes but i doubt enough to hold 500nm of torque and he said he was moving albeit very slowly therefore he was on ice and not going through the ice into the mud all the time. And i dont see why its so hard to believe, A pug 306 gti-6 for example has 6th gear ratio that if pushed to the limiter will allow the car to reach almost 170mph, ofc it never will reach that speed due to aerodynamics vs power war. but if you jacked both front wheels up into the air i am sure you could get that car to hit the limiter in 6th, you are recreating this effect by having next to 0 friction on the ice.
and it is completly theoreticly possible since my car shares the same box as his 1.8 xsara and as he says it does 70mph at 2900 rpm so in 5th gear that means 41.429 rpm/mph in 5th so lets just multiplay that by his guestimate of 150mph (indicated)
6214.285rpm

or we could go the other way the limiter is at 6250 rpm
70/2900= 0.0241
0.0241 =mph @ 1 rpm
0.0241 * 6250 = 150.862mph @ 6250 rpm in 5th gear

figures rounded up on here but not on calc if anyone wants to spot faults :P
 
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Also don't forget that if it hasn't got an lsd chances are one wheel will spin in it's own, so effectively doubling the speedo reading.

How's the car, still able to sell it on Telsa?
 
austinpowers said:
Also don't forget that if it hasn't got an lsd chances are one wheel will spin in it's own, so effectively doubling the speedo reading.

How's the car, still able to sell it on Telsa?
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That is very true and a point I had neglected to think about :)

Well it looks like I have been (Correctly) backed into a corner :p

Sorry Mr Keates for doubting you so, just seemed rather far fetched upon first thought, no hard feelings :)
 
I've got this very long treadmill with a 'plane on it that's trying to take off ...

:D

Wind resistance goes up by the cube of the speed btw. I.E. speed x2 = WR x8
 
austinpowers said:
Also don't forget that if it hasn't got an lsd chances are one wheel will spin in it's own, so effectively doubling the speedo reading.

How's the car, still able to sell it on Telsa?
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It won't double the speedo reading unless the Xsara has a very unusal speedo drive. The majority of FWD cars have the speedometer driven from the "third motion" shaft in the gearbox, which is the shaft that drives the crownwheel on the differential, so it will indicate the same speed irrespective of how many wheels are being driven.

I'd say it's perfectly feasable to hit the redline in top on ice, though probably not a great idea to actualy do it. Wonder if the tyres were rated for 150mph? ;)

I can remember my brothers mini getting stuck on an steep icy hill. We got out of the car to push it, and he left it in first, with the engine idling, and the car was perfectly stopped with the front wheels slowly turning away...
 
Dogbreath said:
I can remember my brothers mini getting stuck on an steep icy hill. We got out of the car to push it, and he left it in first, with the engine idling, and the car was perfectly stopped with the front wheels slowly turning away...
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Now that's cool. Static vehicular moonwalking.
 
Dogbreath said:
It won't double the speedo reading unless the Xsara has a very unusal speedo drive. The majority of FWD cars have the speedometer driven from the "third motion" shaft in the gearbox, which is the shaft that drives the crownwheel on the differential, so it will indicate the same speed irrespective of how many wheels are being driven.

I'd say it's perfectly feasable to hit the redline in top on ice, though probably not a great idea to actualy do it. Wonder if the tyres were rated for 150mph? ;)

I can remember my brothers mini getting stuck on an steep icy hill. We got out of the car to push it, and he left it in first, with the engine idling, and the car was perfectly stopped with the front wheels slowly turning away...
Click to expand...


So why when i spin the wheels on say a roundabout, the speedo goes way higher than it would do if both wheels are rotating at the same speed?
 
I noticed the speedometer on my mums micra seems to lag ? Maybe thats just me and my braking for cameras :D

I think gearing varies on car brand a lot and engine type, I had my old Honda at the redline in top gear for 5 minutes and it was 130mph (apparently), no ice needed or wanted.
But thats japanese cars for you, high revs and short gears I guess where as a big truck or something more traditional probably has these long gears for economy with far more torque.


Good point about the speed rating on the tyre, 1 blown tyre at 150mph would give a lot of traction all of a sudden.



Speed shown shouldnt vary with the angle of a turn (and the varied speed of the two tyres), that'd be real bad.



Sorry about your bonnet, the bumper is built to deform at 5mph and even recover but metal isnt quite so clever I guess. Expert panelbeaters ?

I've done the same thing with grit on concrete, a brick wall and a built-to-burst headlight-indicator
 
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