{"product_id":"differenziale-autobloccante-fiat-punto-evo-abarth-cambio-c635","title":"DIFFERENZIALE AUTOBLOCCANTE Fiat Punto EVO Abarth CAMBIO C635","description":"\u003ctable border=\"0\" cellpadding=\"0\" cellspacing=\"0\" width=\"736\"\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd align=\"left\" valign=\"top\" width=\"736\"\u003e\n\n\u003cp class=\"schedatitolo\"\u003eLIMITED SLIP DIFFERENTIAL FOR FIAT C635 GEARBOX\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd align=\"left\" valign=\"top\"\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd align=\"left\" valign=\"top\"\u003e\n\n\u003ctable border=\"0\" cellpadding=\"0\" cellspacing=\"0\" width=\"736\"\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd align=\"left\" valign=\"top\" width=\"450\"\u003e\n\n\u003cp class=\"schedatesto\"\u003eFront-wheel drive sports cars can suffer from poor traction due to the high engine torque transmitted to the wheels.\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eThis is especially noticeable when exiting a bend, where the inner wheel is partially relieved of the weight acting upon it due to load transfer caused by centrifugal force: this results in one of the two wheels being able to transmit significantly less torque to the ground than the other. It's important to remember that an open differential always splits torque equally, meaning the maximum torque that can be transmitted to the ground is limited by the grip of the wheel with less load.\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eMany modern cars are \u003cstrong\u003ealready equipped as standard\u003c\/strong\u003e with an electronic system called \u003cstrong\u003eTTC, which SIMULATES\u003c\/strong\u003e \u003cstrong\u003ea limited slip differential\u003c\/strong\u003e: in practice, when one of the two drive wheels loses grip, the electronic control unit responsible for traction control sends a braking impulse to the brake caliper of the slipping wheel: the negative torque added to the wheel \"fools\" the standard differential, sending an equal amount of torque to the wheel with better grip. TTC is certainly a valid and safe system that ensures good vehicle control; however, we reiterate that it is not a limited slip differential and does not guarantee the same performance that only a good limited slip differential can provide.\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan class=\"schedatesto\"\u003eIf you regularly use your car on the track during track days, or you don't like suffering from the annoying slipping of the inner wheel every time you exit a corner a little too enthusiastically, then a true limited slip differential might be for you.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eOur helical gear limited slip differential allows the engine's torque to be divided asymmetrically, meaning the wheel with more grip will always receive a surplus of torque compared to the wheel with less load. The locking percentage under acceleration is \u003cstrong\u003eapproximately 35%\u003c\/strong\u003e. We chose not to go higher given that the cars on which the differential can be mounted are road cars.\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eThe helical gear differential operates very progressively and does not create undesirable effects in normal driving. \u003cbr\u003eThe locking percentage on overrun is limited to approximately 25%, so as not to affect braking and corner entry.\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan class=\"schedatesto\"\u003eIt's very difficult to explain the resulting effect in words, but the feeling of opening the throttle after the apex of a corner and not feeling the front end going off on a tangent, but pulling towards the inside, is something unknown to a front-wheel drive car with a standard differential.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eFurthermore,  \u003cstrong\u003eour differential's operation is compatible with TTC.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eHow does a limited slip differential work? First, let's consider the operation of a normal standard front differential. \u003c\/p\u003e\n\n\u003cp\u003e.\u003cimg alt=\"Prometeo Limited Slip Differential\" height=\"291\" src=\"http:\/\/www.prometeomeccanica.it\/immagini_prometeomeccanica\/Differenziale_spiegazione_500Abarth_1.jpg\" width=\"346\"\u003e\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eThe differential is a device that divides the engine torque coming from the gearbox exactly in half for each of the two half-shafts, regardless of the difference in rotation speed of the two wheels on the same axle. So, as shown in the figure, if the input torque to the differential is 100 (units are completely arbitrary), a torque of 50 will end up on each wheel.\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eHowever, there is another important parameter to consider: tire grip on the ground. Torque can be \"transmitted\" to the ground up to the \u003cstrong\u003egrip limit\u003c\/strong\u003e of the wheel; this limit is therefore proportional to the fraction of load acting on the wheel and the coefficient of grip, which mainly depends on the consistency of the ground.\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan class=\"schedatesto\"\u003eSo if one of the two front wheels ends up in an area with reduced grip (e.g., on slippery asphalt), the torque that can be transmitted to the ground by that wheel decreases, as the wheel itself reaches a slipping condition. Due to the property of the differential stated above, which is to be a mechanism that divides the input torque into equal parts, we will have the same torque value on the other wheel, even if it maintains good grip.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg alt=\"Prometeo Limited Slip Differential\" height=\"291\" src=\"http:\/\/www.prometeomeccanica.it\/immagini_prometeomeccanica\/Differenziale_spiegazione_500Abarth_2.jpg\" width=\"346\"\u003e\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eAs can be seen from the previous figure, if the slip limit torque value for the front left is 20, the right wheel can also only transmit a torque of 20 to the ground. Therefore, the total traction of the front axle is reduced to a value of 40, significantly lower than the 100 in the previous example.\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eIf we install the \u003cstrong\u003ePrometeo limited slip differential\u003c\/strong\u003e instead of the standard differential, traction improves in these cases. Let's see how and by how much.\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eFirstly, in conditions of good and homogeneous grip, the limited slip differential behaves like a normal differential, as shown in the following figure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg alt=\"Prometeo Limited Slip Differential\" height=\"291\" src=\"http:\/\/www.prometeomeccanica.it\/immagini_prometeomeccanica\/Differenziale_spiegazione_500Abarth_3.jpg\" width=\"346\"\u003e\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eHowever, if one wheel loses grip, the limited slip differential transfers more torque to the other wheel. \u003cstrong\u003eThe total torque transmitted to the ground by the front axle is therefore greater than that transmitted by a common differential.\u003c\/strong\u003e The following figure is very illustrative of this mode of operation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg alt=\"Prometeo Limited Slip Differential\" height=\"291\" src=\"http:\/\/www.prometeomeccanica.it\/immagini_prometeomeccanica\/Differenziale_spiegazione_500Abarth_4.jpg\" width=\"346\"\u003e\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eThe 35% locking percentage is the best compromise found through numerous tests performed under various conditions. We must not forget that an excessive locking percentage would have made the vehicle too understeering in normal driving, with consequent driving problems. And, on the other hand, too low a locking percentage would have reduced the benefits of the limited slip differential, making it objectively useless.\u003c\/p\u003e\n\n\u003cp class=\"schedatesto\"\u003eContact us for any information!\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e","brand":"MR","offers":[{"title":"Default Title","offer_id":55347568345436,"sku":"MR 152","price":999.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0948\/8341\/4364\/files\/differenziale-autobloccante-cambio-c635-evo.jpg?v=1756392416","url":"https:\/\/www.extremeitalia.com\/it\/products\/differenziale-autobloccante-fiat-punto-evo-abarth-cambio-c635","provider":"EXTREME ITALIA s.r.o.","version":"1.0","type":"link"}