Many of you will know me from my F1 Brera thread, but some may not, so I thought it best to post this latest update in my thread and under a more informative title here too.
How it started
A few weeks ago I recieved a pm from Ned, he explained how he had met the Quaife rep at the Autosports show and that in talking the rep said they now did an ATB LSD differential for the F40 gearbox used in all 2.4 159/Brera's.
Ned said afaik you've changed just about everthing on that car except the diff...would you be interested as I'm putting in a high volume order to get the best price.
Well Yes of course I'm interested, Ned said well problem is we don't know yet how long this may take, the F40 gearbox needs to be removed from the car, opened up, old diff removed, ring gear removed and tranfered to Quaife diff, then new diff bearings fitted and all re-assembled and tracking aligned.
No problem I said, you can borrow the car for as long as it takes, now I've thought about it, this is exactly what this car needs!
The back ground.
A std 159/Brera has an “open” diff that does nothing for maximising the traction available from our tyres, the std diff transmits torque to the wheel with LEAST resistance/traction, its as simple as that and spins it up! and then a very complicated and slow traction control system brakes that spinning wheel and if thats not enough, cuts your throttle too, all you wanted to do was leave that slippery junction quickly and merge with the higher speed traffic!
So what can be done to get more power to the ground before wheel slip accurs? Well finding a way to send torque to the wheel with MOST resistance/traction would be a good start…how about that for an idea?
Quaife has the answer with there Automatic Torque Biasing Limited Slip Differential.
The Automatic Torque Biasing (ATB) Helical LSD differential is Quaife's unique design, and is an after-market differential that provides smooth, constant traction for racing or slippery road conditions. Suitable as an ideal replacement for any front, rear or four wheel drive application, this differential has the added benefit of no adverse effect on the steering of a front wheel drive vehicle. Quaife ATB differentials have been used in a wide array of applications, from Formula 1 cars to emergency and public utility vehicles, where all weather mobility is essential, and where the product must perform in the most demanding of conditions.
The differential progressively locks as torque increases; there are no plates or clutches to wear out, unlike the more conventional limited-slip designs. The Quaife differential is particularly effective in combating the effects of FWD torque steer and understeer.
As engine power outputs through modification increase ever further, the ability to use this extra performance becomes more important. Wheelspin may look spectacular, but such loss of traction from either a standing start or exiting a bend wastes time, whether driving on the road, circuit, rally stage or drag strip. Fortunately, QUAIFE's patented Automatic Torque Biasing (ATB) Helical Limited Slip Differential (LSD) is an effective, well-proven, low-cost solution.
As a direct replacement for the standard, factory-fitted ‘open' differential, QUAIFE's unit can transform the performance of any car.
Unlike a conventional plate-type limited slip unit, QUAIFE's item relies on gears rather than clutch plates for its operation. That means it’s much smoother in operation, as it never locks harshly with a set pre-load of wheel slip across the driven axle. Rather, it automatically biases the torque away from the spinning wheel across the axle, to a constantly varying degree.
How does it work?
Sets of floating helical gear pinions mesh to provide the normal-speed differential action. In the event of wheel slip, torque bias is generated by the axial and radial thrusts of the pinions in their pockets. The resultant friction forces enable the differential to transmit a greater proportion of the torque to the appropriate wheel. The effect is progressive and at no stage does the differential lock solid, hence the inherent safety and user-friendliness of the QUAIFE ATB Helical LSD unit.
To the driver, especially of a front-wheel drive car, the results are significant performance improvements; superior, controllable traction without the harsh steering wheel snatch or torque steer that have long been associated with performance differentials.
The QUAIFE diff is quiet in operation, requires no special maintenance or rebuilds, is long-lasting, and retains the standard method of lubrication, making for an easy, pain-free upgrade. Proven in rallying, racing and on the road, this differential offers safe, reliable, winning performance - everything you would expect from a QUAIFE product.
Standard "open diff"
Quaife ATB LSD.
Quaife ATB LSD with ring gear attatched.
Quaife installed in F40 gearbox.
How does it feel?
I returned a few days later to collect the car and meet some of the Autolusso guys, all very friendly and I was told the finger print recognition caught a few out! lol, they kindly checked my Brands Hatch track settings on Neds high tec aligner, manythanks.
Out on the road this diff is very impressive, I can finally get all the power available from the F1 remap to the ground!
As soon as I drove out of the first junction I felt there was a huge increase in traction, no scrabbling of tyres when there is alittle bit of loose gravel under one wheel, just put your foot down and go! No torque steer, super smooth operation.
Entering roundabouts at speed feels more stable, and applying throttle exiting a roundabout with steering lock still on and the car stays on line as the torque is sent to the outside loaded wheel with most traction, its quite a feeling to be hugging the corners with far more throttle than before and feeling all the traction available!
I can't reccomend this diff highly enough, its exactly what ford fit to there RS model, its exactly what Renault fit to there Megane`Cup, why? because they are high powered fwd drive cars like ours, and these ATB LSD diffs really work and traction is king!
Ned says a 1 day turn around is possible. Price is £1250 including VAT.
If your having a clutch or DMF done at the same time a very competitive package deal can be done, if you ask nicley he may even put my Brands Hatch geometry settings on for you too.
Autolusso is based in Houghton Regis, near Dunstable.
Phone: 01582 869560
Autolusso - Alfa Romeo Specialist | Q2 & Superior Quaife Differential
Manythanks to Ned and his team from me.