Mazda MX-5-ish | Spotted model was dubbed the 'Phoenix' and was also available with the more powerful 1.8-litre S-VT engine with a 4.1 ratio Torsen limited slip differential. As a JDM import. Differentials by OS Giken Super Lock LSD - NC Mazda MX-5 Miata 06-15 MZ091-HA OS Giken Super Lock LSD Mazda Miata NCEC 06 & Up OS Giken utilized its accumulated racing knowledge and engineering experience to develop its own limited slip differential Four years of extensive research and development lead to a new. Mazda created a global phenomenon with the 1990-'97 MX-5 Miata, so the company was careful in crafting that car's replacement. The second-generation Miata, sold in model years 1999 through 2005, was an incredibly successful redesign that saw the youthful original turn into a voluptuous, mature figure, without sacrificing its reliable reputation or accessible performance Mazda MX-5 NC / 100D Quaife ATB Helical LSD differential. Please confirm your application using the attached technical drawing before purchase. In stock. Excl. Tax: £645.00 Incl. Tax: £774.00 . Buy Now. Quaife ATB Helical LSD differential for the MX-5/ Miata NC Axle. A direct replacement for the standard open differential, the Quaife ATB. Mazda Miata Differentials At Andy's Auto Sport, we have a huge variety of Mazda Miata differential to ensure that you have every differential option available to you. We go out of our way to carry every major line of Mazda Miata differential, so that whether you are looking for a aftermarket Mazda Miata rear differential or a performance.
JDM Mazda Miata MX-5 NB 6speed Torsen LSD Differential Limited Slip Diff 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 It was removed from one of our. There are two types of Torsen (TORque SENsing) differentials. Both are used on the Miata. The torque bias ratio in either case is about 2.5 to 1. This means that the differential is capable of supplying 2.5 times more torque to one wheel than the other Ever take a hard turn in a Miata with an open differential and try to get on the gas mid-corner for a quick exit? You'll notice the inside (unloaded) tire is fighting for traction, while there is very little actual acceleration going on. Now take the same hard corner in the same car with a Torsen LSD and you'll notice that power is now being routed to the outside tire (loaded), and actually helping you accelerate out of the corner.
Home Shop Powertrain Differential Miata/MX-5 Torsen differential. Mazda: NA 89-98, NB 99-05. Productcategorie: Drive. Reviews There are no reviews yet. Only logged in customers who have purchased this product may leave a review. Related products. Clutch Miata MX-5 NA/NB-Competition Clutch Stage Discover what changes can be seen from the previous model in our comparison of the 2020 Mazda MX-5 Miata vs the outgoing 2019 Mazda MX-5 Miata. Regardless of the model year, Miata shoppers still choose from a selection of three excellent trim levels - Sport, Club and Grand Touring Kaaz Limited Slip Differential for Mazda MX-5 NB, activate maximum grip, traction and control. Cost effective, tough, direct fit plate LSD's from Kaaz. Available at DriftShop.com
Debuting at the New York Auto Show, the Club version of the 2016 MX-5 Miata gets exclusive features including a limited-slip differential, Bilstein shocks and shock tower brace when equipped with. Tan interior with tan leather seats, tan vinyl top and boot, Torsen limited slip diff, 16 inch alloy wheels, 195/50R16 W-rated high performace tires, power door locks, remote keyless entry, cruise control, windblocker, carpeted floor mats, Bose music system with 4 speakers, door mounted tweeter In 2003, Mazda switched from the Torsen to the Tochigi-Fuji (T-F) LSD. The 2003 T-F diffs were prone to failure, so avoid these if you can. Be advised that the 2004-2005 Mazdaspeed Miata was equipped with a similar 7 ring and pinion, but the differential unit itself is larger Torsen TBR is about 2.5 to one, decreasing slightly from Type I to Type II Torsen. The TFS has slightly less capability to move torque from one wheel to the other with a TBR of 2.0. To the extent that the TBR is reduced, the LSD becomes less interesting to the competitive driver. Race car guys use an RX7 clutch unit, Kaaz, or a spool. For sporting street use the TBR in the realm of 2.0 to 2.5 is certainly an improvement, while being very unobtrusive. How many people post here that they can't tell if they have a Torsen or not?
The NA6A and the NA8A all sported 14 inch wheels. The 1.6 had a 5.5-inch rim and 60-aspect profile tyres, the NA 1.8 litre came with 6-inch rims and 55 profile tyres. Jeff H., CA (2011 Mazda MX-5 Miata Grand Touring 2.0-L 4 Cyl) Seals and/or weather-stripping The weather stripping where the hard-top convertible matches with the windshield was worn and had to.
Get the best deals on Differentials for Mazda MX-5. Shop with Afterpay on eligible items. Free delivery and returns on eBay Plus items for Plus members. Shop today Below is a list of the years it was offered in US market Miatas, along with the gear ratio, and how to identify which cars came with it from the factory. Keep in mind that they were only offered on cars that had a manual transmission. Another thing to keep in mind is that Miata owners love to modify their cars, so sometimes a car that didn't come with one has already had one swapped in, or a car that was supposed to come with one no longer has it. For help in visually identifying which differential the car you're looking at buying has, or which differential your local parts guy is trying to sell you, check out the link at the bottom of the page titled " Differential Spotters Guide"., the 2009 Mazda MX-5 Miata, more than any other car, begs the question: Are you man or mouse? Sadly, it turns out I'm the latter
All iterations of the MX-5 deploy Mazda's 155-horsepower 2.0-liter Skyactiv-G inline-four, so one's extra cash is for naught down in the engine room. Pretty sure the Club has limited-slip differential and the Sport does not. That's the main reason I'd spring for the Club. 2020 The Truth About Cars From 1990 to 1993, the Mazda Miata LSD was a viscous unit. This replaces the clutch pack friction material and preload springs with a bizarre fluid between closely spaced rotating plates. One series of plates is connected to each axle shaft. Speed difference between the axles causes the plates to rotate at a rate relative to each other. This shear rate (and shear rate alone) of a thin film of silicone enhanced fluid increases the fluid’s viscosity. Picture a beer mug sliding across the bar on a thin film of water. The increased shear rate (speed of the mug) increases the viscosity of the fluid, creating more friction. This allows the fluid to transmit torque (makes the beer mug harder to push). The beer mug and water really do not behave this way. Neither does gear oil. That is why a special silicone based oil is permanently sealed into the factory LSD unit. Regular gear oil lubricates the ring and pinion gears.2) If your car came equipped with ABS from the factory make sure you use axles from an ABS equipped donor car. Alternatively, if your car did not come with ABS, you can use ABS or non-ABS axles interchangeably. 2007 Mazda MX-5 Miata Reviews and Ratings Hardtop 2D Touring . CHANGE CAR COMPARE Values Pictures Specifications Reviews & Ratings Safety. Values Pictures Specifications Reviews & Ratings Safety. Consumer Reviews. 4.9. overall had stang for 12 years,mx-5 many more.
Also the rotary engine product list and Mazda's motorsport history. chrome parts and a Torsen limited-slip differential. Based on the M Package (700 units) 1998. Jan. Mazda MX-5 production reaches 900,000 units, sets new Guinness World Record; Sep 1989 First-generation MX-5 And the clutch pack wears out too. An additive is in the differential oil to allow the clutch pack function in an oil soaked world. By the way, friction modifier will also slightly increase the TBR of the Torsen. Mazda MX-5 - MX-5 ND Rear Differential failure - Manatee : I can see the relevance of a LSD to off-roadability, for drifting which would amuse me for no more than 5 minutes, and to track use on a performance or racing car where simply getting power down improves lap times
TORSEN limited slip differential conversion kits for the 1990-1997 NA MX-5 and 1999-2005 NB MX-5. PLEASE NOTE THAT THE AVAILABILITY OF THESE KITS VARIES. When ordering, please expect approximately 2-3 weeks before shipping. Call 1(800) 221-5156 or e-mail firstname.lastname@example.org for more info Both 1.8 liter differentials. The one on the right is from an automatic transmission car as there is no damper. This means it will not be a Torsen LSD.Mazda seemed to think so when they started offering them as a factory option in 1994 and we agree with them! Just makes the whole driving experience more cohesive and predictable in our eyes. Another reason for upgrading is for peace of mind if you have the failure prone 1990-1993 open or VLSD differential, or the 2003-2005 Tochigi Fuji Unit. We won't go into detail on those in this blog, instead we'll leave that for a future article.
Mazda MX-5 Torsen 4.1 Differential Diff Fits MK1 MK2 NA. <br> <br>Removed from my 1997 Eunos V-Special Roadster <br>See photos for condition <br> <br>Collection Only <br> <br> <br>I am breaking my entire car, for more MX-5 parts please check my other auctions or message me for a specific par Mazda MX-5 Miata. Discussion in 'GT4 Tuning' started by My GUESS is that GT4 cannot model the action of a Torsen differential, but there is a possibility. If someone could verify whether or not the game is accurate, I'd be grateful. Using either the 1600 NR-A '04 with 114BHP or the MX-5 '89 with 108BHP. (because it's the last race for. Different scenario: You plan on taking off from the line hard on an uneven surface or the surface is slippery. In the car with the open differential power is going to be routed to the tire with the least traction and will likely sit there and spin that tire before acceleration slowly begins to happen. Same scenario with an LSD, and you'll notice that the tire with the most traction will be favored, thus allowing for forward acceleration. Mazda Mx 5 OLX.ro. Prin clic pe butonul Inregistreaza-te, accept Termenii de utilizare. Am înțeles că S.C. OLX Online Services S.R.L. îmi folosește datele personale în conformitate cu Declarația de confidențialitate și Politica privind modulele cookie și alte tehnologii similare.S.C. OLX Online Services S.R.L. recurge la sisteme automate și la parteneri care analizează modul în.
. Yet the soul of the MX-5 remains unchanged, reminding us what it truly means to take the wheel - with the freedom and joy of no destination in mind. For more detailed information, download the 2020 Mazda MX-5 ST specifications and features View detailed specs, features and options for the 2020 Mazda MX-5 Miata Club Manual at U.S. News & World Report
1994-2005: Upgrading to a 2004-2005 Mazdaspeed Torsen, you'll need: Full Mazdaspeed differential with aluminum housing and both Mazdaspeed axles: The top-performing Miata Roadster is the Club model. When optioned with a manual transmission, the MX-5 Club comes with Bilstein shock absorbers, a limited slip differential, added shock tower bracing, and an induction sound enhancer. The Club also gets unique wheels, a front air dam, a rear spoiler, a nine-speaker audio system and other niceties To me, a "torque sensing" differential has helical gears, not cone clutches. But, I'd hate to defend that position in court. The 2019 Mazda MX-5 Miata places near the top of our sports car rankings. It's an all-around winner, delivering razor-sharp handling and a comfortable cabin. One of its few downsides is a micro.
2003 Mazda MX-5 Miata LS The vehicle has great handling around corners and the ride is smooth and very responsive. Very comfortable on long or short drives. I have never had any problems with this car. It has low maintenance and is extremely reliable. . The only con is that the highway ride is a little noisy Used Torsen limited slip differential, 4.1:1 ratio, Mazda MX-5 mk1 1.8, 1995-98 and mk2 5-speed 1998-2005. As fitted to all UK 1.8 mk1 1.8iS cars from 1995-98 and import Eunos Roadster 1.8 manual models (except R-Ltd, RS-Ltd & VR-Ltd which had the 4.3:1 ratio version) from 1995-98 Another way of looking at the same idea is that the open differential can deliver no more than 50 percent of the available torque to any wheel. When both wheels are on a hard surface and the car is pointed straight, this is not a problem. 50 + 50 = 100. As you exit a corner and the lightly loaded inside wheel begins to spin, the torque to the outside wheel drops also. If one wheel is performing at 25 percent, the other is at 25 percent. The rest of the available torque goes to wheel spin or the driver is forced to lift throttle to avoid overreving/spin out. It is the loss of tractive effort from the outside wheel that racers want to eliminate. The spinning of the inside wheel does not matter much by itself. That wheel is lightly loaded anyway and can not contribute much to propelling the car out of the corner.
With the car on a lift, it has been suggested that the relatively puny force of you rotating one wheel, will not over come the internal friction of the Torsen. Both wheels rotate together. However, with the driveshaft constrained, the opposite wheel should rotate the other way just like an open differential once you exceed the TBR. Perhaps a bored member reader would like to experiment with some ropes wrapped around the wheels and those unused workout weights… Caveat Emptor: the 1994-1997 model years came with a torsen lsd, but the earlier cars came with a viscous lsd. The merits of either is its own discussion. Happy Hunting! There are multiples way to find out if your Miata has a LSD. And don't fret if you Miata doesn't have a limited-slip differential The test for a viscous LSD says a rear wheel must turn no faster than 3.75 rpm with 11 foot pounds of torque on an axle (page M-26 Shop Manual) with both wheels free to rotate and the driveshaft constrained. Although the shop manual does not give any more data points, the resistance to turn should increase with the speed of rotation. Of course European MX-5 fans know that the 2.0 has a Torsen-style limited slip differential to make up for itself, but that's a part you can order from Mazda and jam under the 1.5 as well
View and Download Mazda 2002 Miata MX-5 owner's manual online. 2002 Miata MX-5 Automobile pdf manual download. Also for: 2002 miata mx5, 2002 mazda mx-5 The Mazda MX-5 Miata is getting a host of new upgrades for the 2018 model Spend $29,155 for an MX-5 Club with a six-speed manual and you'll get a limited-slip differential, shock tower brace. Select another mazda model mazda mx-5 differentials and parts Replacement Car Parts. We offer differentials and parts replacement car parts for all mazda models, if you would like to see parts for a model other than mx-5 click one of the car images below
3) Miata axles like to get stuck in the spindles, a conscious effort to remove them carefully will help prevent damage to the axle upon removal, or help prevent them from being permanently stuck in the spindle. If they do get stuck, a replacement spindle may be necessary. Get the best deal for Differentials & Parts for Mazda Miata from the largest online selection at eBay.com. Browse our daily deals for even more savings! Free shipping on many items The 86 pipped the MX-5 RF by little more than 0.1 second: the 2017 Toyota 86 at 1:30.26 and the 2017 Mazda MX-5 RF with a 1:30.39 best. Considering the RF gives up 50 horsepower to the 86, that's. Bid for the chance to own a 24k-Mile 1994 Mazda MX-5 Miata 5-Speed at auction with Bring a Trailer, the home of the best vintage and classic cars online. Lot #30,688. which is sent to the rear wheels through a five-speed manual transmission and a Torsen limited-slip differential. Service under current ownership included replacing the clutch.
AXLE RATIO & IDENTIFICATION See AXLE RATIO SPECIFICATIONS. To determine axle ratio, divide number of ring gear teeth by number of pinion teeth. DIFFERENTIAL ASSEMBLY 1991 Mazda MX-5 Miata 1990-91 DRIVE AXLES Differentials & Drive Axles - 929, B2200, B2600i, MX-5 Miata, MPV, Protege & RX-7. We know this is a 1.8 liter because it has a pinion damper and stub shafts with four ears, each with a stud in it, but no extra ears in between. It is open, as also circled, are the spider gears. Later 1.8 liter halfshafts, after mid '95 are one piece - without separate stub shafts. So this is an early 1.8 liter differential.Over the weekend a friend asked me how to tell if a Mazda Miata has a limited-slip differential (lsd- and not the drug). It got me thinking that there are some other people that might want to know this too. Since it’s an important feature to have if you want to race your Miata. This LSD guide is an overview for the first generation Mazda Miata (1989-1997). 2020 Mazda MX-5 Miata Suspension Deep Dive The 2020 Club and Grand Touring come with a limited-slip differential. It's not a Torsen differential as was sometimes used in past years, but is. Well, when is a clutch not a clutch? The Torsen has clutches too, but since they are not obvious and not serviceable, and do not wear out for a long long time, they are ignored. Torsen clutches don't look like clutches either, but rather metal washers. In some cases, even the washer is omitted and the "clutching action" is a rotating gear against a stationary housing.
2003 Mazda mx5 Nevada 1.8 In good condition 105,000 miles 5speed Has got Torsen LSD, heated leather seats , strut brace, Nardi steering wheel, few new parts Comes with soft top but can include hardtop at extra cost 4 good tyres No mot Quarter panels need attention bu 1.8 liter Type I Torsen on the left and 1.6 liter on the right. Circle notes that the 1.6 liter differential never has the rubber damper of the 1.8Luckily Mazda made these cars like Legos, meaning that you can easily replace your factory differential with bolt in parts, no further modifications needed. The Tochigi Fuji Super (TFS) uses cone clutches made of metal which I assume is machined to exacting tolerance and hardened. Cone clutches can transmit higher torques for a given diameter than traditional flat plate clutches.
Popular Equipment Package "PEP": Look for power mirrors, power windows, cruise control AND power antenna. It also featured on the 2002 USA Special Edition model around the same time. This shade of warm, vibrant yellow would not be used on the MX-5 again. Since the car is a 5-speed NB2 model, the 1.8 Arizona is fitted with a 4.1 Torsen limited slip differential, instead of the 3.6 reserved for the top 6-speed Sport models Sport Package: Look for Bilstein shocks, front lip spoiler, 15" wheels, strut tower brace, "Hard-S" designation on info sticker on passenger side door jam. (4.3 Gear Ratio)Although the rim sizes increased from 14 to 15 to 16 inches, the profile of the tyre reduced from 60 to 45. Lowering of the tyre profile reduces the circumference of the tyre. The tyre profiles and sizes are detailed in "Know Your Car Series 5".You would not have a spool on your street driven Miata. If a spool is installed and the car is on a lift, the wheels will not turn unless the driveshaft is free to rotate. The wheels always turn in the same direction and speed.
The higher the ratio number the greater is the number of turns of the tail shaft to turn the wheels once. For example, a 4.3:1 ratio, as in the NA6A models, requires 4.3 turns of the tail shaft to turn the wheels once. The 1.8 litre cars in the NA and early NB models had a 4.1:1 ratio; the NB8B had a 3.636:1 ratio. Once again the NB8A anniversary models were different; having a limited slip differential with a 3.909:1 ratio. Limited Slip Differentials available in the 1.6 litre models were viscous LSD's. The viscous LSD contained a silicone fluid. When one wheel began to spin it caused the fluid on that side to spin and in doing so becomes thick and transfers the motion to the other side of the differential. The 1.8 litre cars came with Torsen type differentials (4.1:1 in NA8A models and 3.909:1 in the NB Anniversary 6 speed models). A Torsen LSD uses parallel helix gears to keep the torque balanced to each drive wheel. Used low ratio Torsen limited slip differential, 4.3:1 ratio, Eunos Roadster mk1 1.8 R-Limited & RS-Limited, 1994-95. As fitted to the R-Ltd and RS-Ltd special editions instead of the standard 4.1:1 ratio version from 1994-95 Mazda is bestowing some updates to the MX-5 Miata roadster and RF models for 2020.; There are newly available colors and a few pieces of new equipment. Prices rise by $700-$890. The 2020 Miata. There have been just 2 gearboxes, the 5 speed and the 6 speed. The 5 speed, introduced in the 1989 NA6A (1.6 litre Aug 1989 - Sept 1993), continued on to be the standard gearbox through the NA8A (1.8 litre Oct 1993 to Nov 1998) and NB8A (1.8 litre Dec 1998 to Oct 2000). The only exception being the NB8A anniversary models which had the 6-speed gearbox.
To the driver, the open differential is the safest, most forgiving system. Floor it coming out of a corner and you get less acceleration than you wanted and the outside wheel is still in rolling contact with the road, holding the rear end of the car in line. CSI Automotive Sales, Service & Parts. New, Used and OEM Automotive Parts - Large Inventory - Great Prices 1994-2005 Mazda Miata Mx-5 Differential 1.8l Open Rear Diff 41 Ratio Used Oem. 239.99. 94-05 Mazda Mx-5 Miata Torsen Open Diff Differential Housing Carrier Cover 8177. 149.00 Mazda MX-5 Miata Dapper Lighting Matsushita Gen III Ballasts With Mounting Brackets Genuine Mazda Miata OEM Driver Side - Left Hand Door Lock Barrel and Matching Key 1990-1997 Retail Price: $69.9
Lastly, here are our recommendations for these specific scenarios. Of course, personal preference and driving style may dictate a different path for your car:Flounder: Josh Taylor Editor in Chief: William Byrd Lead Writer: Jacob Auernheimer Writers: Andrew Fails, Andrew Murphy, Andrew Pascarella, Danny Korecki, Sean O’Donoghue, Host, Untitled Car Show: Ike
Mazda MX-5 ND Racing Differential Cooler Kit. This Mazda MX-5 ND Racing Differential Cooler Kit from Sick Sideways contains everything needed to install a racing differential cooler for your Mazda MX-5 ND. This product will improve the performance of the vehicle during long strenuous use km (7,500 miles). However Mazda recommends to rotate every 8,000 km (5,000 miles) to help increase tire life and distribute wear more evenly. *4Tire Pressure Monitoring System (TPMS) initialization must be performed so that the system operates The normally (if equipped). *5 If this component has been submerged in water, the oil should be replaced 2017 Mazda MX-5 Miata Overview Is the 2017 Mazda MX-5 Miata a Good Used Car? The two-seater 2017 Mazda MX-5 Miata is an excellent sports car. The Miata comes with either a manual soft top or a power-operated hardtop. It lacks the abundant horsepower found in some rivals, but it doesn't need it The Mazda MX-5 (NB) is the second generation of the Mazda MX-5 manufactured from 1998 to 2005. The model continued the MX-5's philosophy of being a lightweight, front mid-engine, rear-wheel-drive roadster while featuring numerous performance improvements, however lacking its predecessor's retractable headlamps. The NB is also the only generation to feature a factory-built turbocharged variant. 5. 1999 Mazda MX-5 Miata 10 th Anniversary Edition. Anniversary editions for a lot of cars are little more than a few graphics and new badges. The 10 th anniversary MX-5 Miata was a lot more than.
2003 MX-5 Miata New Car Test Drive. 205/45WR16 tires, a Torsen limited-slip differential, power door locks, and cruise control. For 2002, the Miata LS features a modular Bose audio speaker. Learn more about the 2007 MAZDA MX-5 Miata. See the 2007 MAZDA MX-5 Miata price range, expert review, consumer reviews, safety ratings, and listings near you R-Package: Look for manual steering, Bilstein shocks, front and rear bumper lip spoilers, trunk spoiler and alloy wheels.
1.6 liter viscous limited slip differential (VLSD). If you look in the holes (in real life, not this poor picture), you see spider gears. The sealed viscous unit is off to one side in there. Works well in all Miata differentials from standard to viscous (90-93) to Torsen limited slips (94+). One quart required. Not for use in the transmission, use either MTL or MT-90 there
Popular Equipment Package "PEP": Look for power mirrors, power windows and cruise control at a minimum. For all advertising and business related opportunities please don’t hesitate to get in touch and Contact us. A Quick History of Mazda's MX-5 Miata, from 1989 to Today. Both offer essentially the same equipment—a Torsen limited-slip differential, a six-speed manual transmission, white-faced gauges. 94-05 Mazda Mx-5 Miata Oem Lsd Diff Differential Lsd Torsen 4.10 1.8l Manual. 550.00. View Details. Oem New Ford Racing Torsen T2r Limited Slip Differential Lsd 2015 Mustang Irs. Jdm Mazda Mx5 Miata Torsen Lsd Differential 1994-2005 Limited Slip Diff 3.9 Axle. 1,299.00. View Details. Carrier Gt 3.73 Ratio Torsen Differential Fits 15-17.
With the car on a lift with the driveshaft constrained (in gear), turning one rear wheel will cause the other wheel to turn the other way. You should be able to turn it rapidly with relative ease. With the driveshaft free to rotate (gearbox in neutral), the internal friction of the open differential is probably not high enough to turn the driveshaft anyway and the result is the same.So, the Miata VLSD is probably not weak or broken, just poorly matched to its application. If it DOES break, it can be overheated oil, or broken tabs on the 'clutch' plates, or I suppose the fluid could leak out. In any case, the unit is not serviceable and one suspected of being defective is discarded.
2001 Mazda MX-5 Miata Base European made Mazda miata, very simple to maintain, very reliable, easy on the gas mileage, comfort drive, easy getting in and out of traffic. Bose sound system, with the greatest surround sound. Not hard to find replacement part at a very good price The 2020 Mazda MX-5 Miata convertible is nearly the last of its kind. It's a small, nimble 2-seat convertible for less than $30,000, and its only real competition is the Fiat 124 Spider, which is based on the MX-5 Miata's platform but has revised styling and a turbocharged engine. But that's about all you'll find — unless, of course, you move to the used car lot, in which case an. Since a spool will send 100 percent of the torque to one wheel (but has an infinite torque bias), the clutch style limited slip people needed a figure to describe how close their clutch pack approaches a spool. Take a torque bias of 5 to 1 for example: 5/(5+1) = 83 percent. An open differential at torque bias of 1 to 1: 1/(1+1) = 50 percent. Or a spool: infinity/(infinity + 1) = 100 percent. So the “stiffness” of clutch pack limited slip can be expressed as a percentage between 50 and 100. The various combinations of gearbox and differential ratios when combined with tyre sizes require differing engine rotations to cause the car to travel a particular distance. Table 1 shows the engine (crank) rotations and the distances travelled for combinations of gears, differentials and tyre sizes. To upgrade an NA MX-5 (Miata) diff you must have the following: 1. Replacement diff (obviously) 2. Replacement drive shafts- shortened torsen spec (due to larger size of the torsen replacement) 3. Replacement prop shaft- shortened torsen specific 4. 0.65 litres API GL-5 Differential/gearbox oil 5. Goggles (I had to have rust removed from my eye.