C7 Posted September 22, 2004 Share Posted September 22, 2004 Why does a LSD allow you to do donuts better than a normal diff ? Simple explanations please 😳  Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted September 22, 2004 Area Representative Share Posted September 22, 2004 Without an LSD one wheel will spin and the other stay stuck to the ground. The LSD drives both wheels. Link to comment Share on other sites More sharing options...
caterhamnut Posted September 22, 2004 Share Posted September 22, 2004 Some very basic desriptions here and a clip of Tessa doing some on the Chat thread. 😬 HUGE UPDATE NOW WITH VIDEO here 70,000miles in 3 years Link to comment Share on other sites More sharing options...
Sue Dinnim Posted September 22, 2004 Share Posted September 22, 2004 Although I won't pretend to know the full technical details. A normal diff allows one wheel to spin faster than the other so when you go round corners they can turn at different speeds and not try to push forwards. This means if you start one wheel spinning all the power goes to that wheel and none to the non spinning wheel. The LSD as its name suggests limits the amount of slip between the wheels so if one spins the other will still turn which means if you get both spinning then you can go round and round to your hearts content. This is why some real 4x4's have diff locks so if they get one wheel in slippery ground or in the air they can still make progress. If you have ever got a car stuck in mud and one wheel starts spinning then you can't get out. The LSD allows the other wheel to still turn. Probably not as good as A&T's description but hopefully it helps. A slowly increasing number of photos here plus a shameless link to my company as I cannot do it from Blatchat. Link to comment Share on other sites More sharing options...
Lotus Boy Posted September 23, 2004 Share Posted September 23, 2004 Hope no-one minds but can I hijack this thread for some advice? I test drove a Seven recently that is fitted with a Quaiffe 'box and although I didn't find it too loud, it did make a loud droning/whining noise when coasting. As soon as you apply a bit of throttle the noise pretty much disappears. Is this normal or could the noise be related to a problem or something else? Thanks for any advice. Link to comment Share on other sites More sharing options...
Peter T Posted September 23, 2004 Share Posted September 23, 2004 Yes this is normal, backlash in the gears causes the noise, and when you apply torque the meshing of the gears disapears as load is applied. Some straight cut gearboxes are very noisy when no load is on. Â Support the 7 Society...... Ehhh? Link to comment Share on other sites More sharing options...
Lotus Boy Posted September 23, 2004 Share Posted September 23, 2004 Thanks for the reply Pete. Sadly the car was sold before I could get back to the guy. Ho-hum sure there will be another long soon... At least I will know for next time. Link to comment Share on other sites More sharing options...
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