What is the Q2 differential like and what does it do ? - Alfa Romeo Forum
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What is the Q2 differential like and what does it do ?

Hi guys, interested in buying a 147 sport Q2 but I was wondering just what the Q2 differential is and how it works? I have a 147 Ti version at the mo with the 1.9 150bhp engine, so just what difference is there between the two ? any info on this would be appreciated
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Basically it limits the torque steer effect and critically its stronger than original ,as there have been many cases of exploding diffs

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Makes a massive difference in terms of reducing understeer, and improving the way power is applied.
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A must have if you have the choice.
Try one without then the one with it should be very different.
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I've only had my 147 q2 sport for a few weeks but have had various cars previously with and without diffs and can honestly say its one of the best "feeling" cars i've had. The diff makes the car feel so much more connected with the road whereas i find a car without a diff feels very "numb". Makes the power delivery very good out the corners as well! Well worth it if you can get one.
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Surely the 'Q' in 'Q2' stands for Quaife, no?
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Originally Posted by androo View Post
Surely the 'Q' in 'Q2' stands for Quaife, no?
No it doesn't

Alfa copied the Quaife diff but the Q in Q2 has nothing to do with Quaife

Alfa use the Q to describe lots of transmissions, Q4 , Q Tronic etc etc

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Oh right, do you know what the Q stands for? or Did Alfa just picked a random letter of the alphabet?
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All cars with two driven wheels have a Diff...

This is just a limited slip differential. Hence it locks at certain amount of slip.

IE you go round a corner tight and plant the accelerator. The out side wheel is spinning faster than the inside front wheel. The engine naturally through a standard diff sends power to the outside wheel (As it is spinning faster) which is where you don't need the power. You need it on the inside driven wheel. The outside one needs as much grip as possible as the weight from the car and turn is being force upon it.

But what happens is a standard diff sends the torque to the outside wheel meaning the inside wheel doesn't get much and thus causes the outside wheel to spin. This means in a corner you run wide or cause a lot of tyre smoke.

A Limited Slip Diff means that it can't do that. It locks at a certain point (well transmits the torque to the inner wheel) allowing the car to essentially grip more power down.

Its mechanical advantage which really every car should have. They don't even cost that more in the first place and make huge differences.

But alas car companies are forever trying to cut costs somewhere.

Look up Limited Slip diff on you tube and you should get decent videos on how they operate.

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