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Limited Slip Differential Types Compared

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A few weeks ago, I posted about traditional clutch-type limited slip diffs (LSD's) and how they work. You can read about those in the previous post: How Limited Slip Diffs Make You Faster on Track. But as you might know or have learned from reading the article, they aren't without their faults, which means engineers are always working to get around those limitations.

You may not be surprised to learn that something like the Ferrari 488 GTB doesn't use a traditional limited slip diff, but it's not limited to super cars, far from it. Cars like the Golf GTI, the Civic Type R, various Mustangs, Corvettes, and BMW M cars, and even the Lexus RC F and GS F, all avoid a traditional limited slip diff in favour of one of these technologies. To keep things simple, I'll focus on two wheel drive vehicles. The vast (vast) majority of principles apply to all and 4 wheel drive vehicles, but there are some subtle differences that I'll cover in a future post.


Gear-type Limited S…
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Bridgestone Potenza RE-71R Track Review

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For better or for worse, I have heard and read so much about RE-71R's. Everyone swears by the grip but complains about the wear. Generally speaking, the pros are:

1. They grip as well or better than most R comps.
2. They don't wear as quickly as R comps if driven occasionally on the street.
3. They work better in the rain than R comps.

The cons were limited to overheating quickly when used on track (being an autocross tire) and wearing too fast on heavy cars like mine.

In the popular 200 TW category, they are faster than the popular Hankook RS-4's and BFGoodrich Rival S's according to published Tire Rack Tests. According to plenty of reviews, they are also faster than well established R comps like R888R's (which don't seem to work too well on heavy cars anyway) and the venerable NT01's. But I was still hesitant for a while until I talked to a tire tech support gentleman at Tire Rack who has gone faster on RE-71R's than NT01s. In a Mustang (his own, not…
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Stock Suspension S197 Mustang With Square 305/30/19's

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If you've had any doubts about whether or not they will fit, fear not! You absolutely can run square 305/30/19's. I had a lot of doubts before pulling the trigger, even more so when the wheels where on the car. The tires do poke out a bit and I figured rubbing is all but guaranteed at full compression but I couldn't be happier I trusted APEX and those on here who have run it.

Here's what you need:

1. Camber plates: I have MM C/C plates and they are maxed out at -2.3 deg with the stock struts. I have been running them for years with many track days without issue.

2. 1"/25 mm spacer: I have Motorsport-tech 1" spacers and they look like high quality units. There is maybe a 1/4 inch clearance in the back so you can't go any narrower than 25 mm. http://www.motorsport-tech.com/adaptec/car/ford_s and you want Design 2.


3. Elongated studs: your best bet is to get the FPP hubs with elongated studs instead of reusing the old one. Bearings are consumables anyway so…
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How Limited Slip Diffs Make You Faster on Track

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Over the years, I've found that limited slip diffs (LSD's) are some of the least appreciated performance parts you could get (or upgrade) for a car. LSD's make a big difference, though, because they can vastly improve how early you can get back on the power and, therefore, how good your corner exit is.

That last bit is very important if you're driving on track and want to get a good lap. You don't have to just take my word for it, though. F1 royalty Sir Jackie Stewart puts an emphasis on the importance of corner exit. When Captain Slow was sent to him to cut 20 seconds off his lap time (Top Gear Season 8 - Episode 5), Sir Jackie told him: "the exit of the corner is FAR more important than the entry of the corner, with regards to smoothness."


You really need to nail the exit. And to get a better appreciation for and understanding of LSD's, you first need to know how open diffs work and where they fall short. If you're not sure, brush up on Differe…
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Does An Aftermarket Grille Really Increase Airflow?
I put a Saleen S281 grille to the test to answer that question.

Stock Suspension S197 Mustang With Square 305/30/19's
What you need to fit a proper size square tire setup.

How Limited Slip Diffs Make You Faster on Track
What you need to know about how they put power down and pros and cons.

Can Telemetry Explain Schumacher's Talent?
A comparison between Schumacher's and then team mate Herbert's data.





Cayman GT4 Track Review
The first Cayman with proper (911-challenging) power.

Is an EcoBoost Mustang any good on Track?
Two days at the track in a Mustang short 4 cylinders.

2016 BMW M4 DCT Track Review
It's quick (properly quick). But is it fun?

Can a stock Golf Diesel handle a Track Day?
Not your every day track beater.



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Stock Suspension S197 Mustang With Square 305/30/19's

By
If you've had any doubts about whether or not they will fit, fear not! You absolutely can run square 305/30/19's. I had a lot of doubts before pulling the trigger, even more so when the wheels where on the car. The tires do poke out a bit and I figured rubbing is all but guaranteed at full compression but I couldn't be happier I trusted APEX and those on here who have run it.

Here's what you need:

1. Camber plates: I have MM C/C plates and they are maxed out at -2.3 deg with the stock struts. I have been running them for years with many track days without issue.

2. 1"/25 mm spacer: I have Motorsport-tech 1" spacers and they look like high quality units. There is maybe a 1/4 inch clearance in the back so you can't go any narrower than 25 mm. http://www.motorsport-tech.com/adaptec/car/ford_s and you want Design 2.


3. Elongated studs: your best bet is to get the FPP hubs with elongated studs instead of reusing the old one. Bearings are consumables anyway so…
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2020 Mid Engine Corvette C8.R Race Car And Engine Specs Revealed

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It's finally time to welcome the brand new 2020 mid-engine Corvette C8.R race car. I'd say this is the most hotly anticipated race car to debut since the current Ford GT, but Ford surprised the world with the GT so there wasn't a whole lot of anticipation. This may be the most hotly anticipated new race car ever in quite a while, much like its street going mid-engine sister.

It's the first clean sheet design in about 20 years, Chevy says, since the 1999 C5.R and will race for the first time ever at the 2020 Rolex 24 Hours of Daytona. Chevy says there is a deeper connection and technology transfer between the C8.R racing version and the road-going C8, and the highest percentage of shared parts of any Corvette generation before.


In fact, the C8.R utilizes the production chassis built right alongside the other chassis meant for street duty in the Bowling Green Assembly plant that builds the street version. As expected, there are some modifications to meet race requiremen…
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2020 Shelby GT500 Top Speed & Downforce Figures Revealed

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The last iteration of the Shelby GT500 that debuted in 2012 as a 2013 model year had 663 hp and a claimed top speed of over 200 mph. While some publications tried and failed to replicate the top speed claim, you knew that somewhere under specific conditions, Ford probably was able to crack 200 mph. If you were expecting the new one with "over 700 hp" to also crack 200 mph (I was), you'd be wrong.

Ford is going to equip the new Shelby GT500 with a 180 mph governor, meaning the GT500 will be electronically limited with a top speed of 180 mph. That is, at least until someone fiddles with it like they do with BMW's and remove the 155 mph limiter. Thankfully, it appears that top speed has been sacrificed at the altar of track performance.


A More Balanced Pony Car

A Ford spokesman told me that "Ford Performance engineers and professional drivers have found the sweet spot to make the all-new Shelby GT500 as fast as possible at both road courses and the drag strip."…
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This Lanzante Porsche 930 is powered by a GP-winning F1 Engine

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Whenever I hear of an outlandish 911 build, I always wonder what hardcore 911 would think. In my experience, they tend to love tradition and preserving the 911 legacy. This car breaks two of the holy trinity of classic 911's; rear engined, flat-six, and air-cooled. It is still rear engined but it uses a V6, water-cooled engine. But I can't imagine a single 911 fan being upset about this.

You see, this isn't just any water-cooled V6 engine. It is a Formula 1 twin-turbocharged 1.5 litre V6 out of a McLaren MP4/3 F1 car. Further preserving the Porsche-ness of this build, the engine was built by a partnership formed between Porsche and TAG to provide engines for McLaren F1 team. Porsche was responsible for the technical burden of design and engineering and TAG financed the effort and stuck its name on the engine as "TAG turbo" since McLaren didn't want Porsche's name on their F1 car.

Lanzante first revealed the car in October last year shortly after the annu…
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