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Archives for October 2015

The Datsun Z as a Roadster – A Background and History

October 21, 2015 by Greg

Almost since the S30-chassis Z car was introduced in 1969, some enthusiasts have envisioned it as a roadster. Others abhor the idea, considering the chassis is already flexible, with its long door openings and lack of a true B-pillar. It’s a polarizing thought, argued with equal vigor from both sides.

Regardless, numerous Z cars got the droptop treatment over the years, ranging from backyard hack jobs to beautifully-executed professional roadster conversions.

Each car, no matter how well-done, seems to generate the same discussion – Was the Z ever intended to be a roadster, or is it a desecration of the original styling exercise and the sporting intent of the car?

It’s important to note that the Z was the successor to a platform that was ONLY available as a Roadster – the 1600 and 2000 Sports Fairlady Roadsters of 1962-1970. Those cars saw success in Japan and abroad, and placed Datsun on the map from a performance and racing standpoint.

Well, we can discern the answer to that question with a little reading. NISSAN DATSUN FAIRLADY (Specifications and Performance of Vintage Japanese Cars), a book written by Koichi Inouye and published in Japan, seems to hold the key to this disagreement. In the styling analysis of the Datsun Z, from early prototype drawings all the way through to completion of the final design, factory photos of the prototype cars represent the Z as a traditional sports coupe – but we also find designs of a roadster, and even a Targa-top version, of what would become the iconic Datsun Z.
datsun_Z_prototype_roadster (3)
datsun_Z_prototype_roadster (2)
Sadly, it did not come to pass, due to a couple reasons: Federal rollover safety standards, and weak sales of open cars in the primary market (the US) made Nissan’s decision easy – Neither the open-top nor the Targa-top S30 platform would be built.
datsun_Z_prototype_roadster (1)
So, that settles that argument.

However, there were steps taken to address that void in the lineup. An excerpt from Michael F. Hollander’s ‘The Complete Datsun Guide’ (1980):

“Frank Boulton has been a Datsun enthusiast for years. It so happens that he is also a Datsun dealer in Miami, Florida, where the weather gets rather warm. Frank loves open top sports cars, so naturally, he wanted one of his own. Being a Datsun dealer, he also wanted something to draw customers to his show room. So, Frank Boulton set his staff to work and came up with the Griffith Z roadster, a modified Z car with a solid trunk lid instead of a hatch, and a removable soft top. Boulton Motors at the time of introduction said they would build one for anyone for $3200 plus the cost of a Z car to be converted. Thus, the dream of enthusiasts came to fruition, not in Japan, but in sunny Florida.
griffith_Z_roadster
The Griffith Custom Coach Company of Fort Lauderdale, Florida, performs the actual work on a Datsun Z from Japan. The car is reinforced in the rear bulkhead area, undercarriage, and windshield frame to overcome the disadvantage of cutting the integral unit-body of the Z. The luggage compartment permits stowage of the cloth top and bows, as well as luggage. When the trunk is opened, a courtesy light comes on, illuminating the fully carpeted compartment. The Griffith Z has brought the styling exercises of Nissan to life in a spectacular way. For the Z car enthusiast, it may be the ultimate sunroof.”

Of the Griffith Z conversions, Popular Mechanics said in 1977:

“The guys who customize, personalize and unhomogenize look-alike production vehicles are flourishing. The more our wheels are standardized, the bigger the market for the wielders of imagination who can give a tricky twist to the commonplace. The new wrinkle for Datsun Z cars is a roadster setup. Griffith Custom Coach in Fort Lauderdale is working with participating Datsun dealers on the conversion of stock Zs to ragtops. Add $3200 to the sticker for a Z and Griffith will hand-tailor the new top to the car.”
griffith_z_2 griffith_z_1
Sadly, very few of the Griffith conversions were made, and as of this writing, almost none remain. While several other custom coachbuilders developed conversions for the Z, and even more local shops lopped the tops off of ill-fated Z cars, most have been rendered parts donors due to their compromised structure and the passage of time.

An open-roof Z car would not grace showrooms until 1979 with the arrival of the S130 platform, available with a t-bar roof (or t-tops). Another thirteen years would pass before a true open Z arrived, after the unveiling of the 1993 300ZX at the 1991 Tokyo Motor Show (and a retractable-roof 300ZX Spyder concept made waves at the 1992 Paris, Geneva and Detroit auto shows).

Chime in on this and other interesting Z car discussions in the Datsun Z forums!

Filed Under: Z cars

In Traction: The Cure for Datsun Wheelspin

October 8, 2015 by Greg

Special thanks to Cody Busch of Race Tech Connection and Quaife for this article!
Quaife-Feature-725x300
After circuit racing our little small block powered Datsun 260z in the 24 Hours of Lemons in May, and drag racing with the NMCA WEST just two weeks ago, one thing stood out as the biggest issue on the car. Wheelspin! Our warmed over small block Chevy puts out way too much power for one 225mm tire to transmit to the pavement. As a solution to that, we contacted Quaife USA to provide a limited slip differential to tame the little beast we call Detroit Datsun.
differential
The Problem:
Before getting into the function of our new limited slip differential, it is important that you understand how an open differential works. Looking from the top at a vehicle going around a corner the outside wheels must spin faster and further than the inside wheels.The idea behind a differential is to allow both wheels to spin at different speeds. See the illustration above, or for explanation of any of the technical terms blowing your mind in this article, see our full explanation of commonly misunderstood drivetrain parts here: Drivetrain Basics

Strictly speaking of rear wheel drive cars, the power comes in from a transmission connected to the rear end via a driveshaft. The drive shaft is bolted to the pinion gear and the pinion gear powers the ring gear which is bolted to a carrier. That carrier can be open, locked, or a limited slip (interchangeable with traction lok, suregrip, positraction, etc). Each has its own benefits and drawbacks, but an open differential has the handicap of always powering the easiest to spin wheel. If you are going around a corner that is usually the inside wheel. If you are on snow it is whichever wheel is on the slipperiest surface; the exact opposite of what you would actually want in either situation! This is where an open differential leaves you with a useless spinning tire and no power transfer to the ground, and it is also where a limited slip differential comes in handy. It does exactly what the name implies. It limits the slip of the tire that is easiest to spin!

Evidence:
In our Datsun’s case, the problem is that around corners and on the dragstrip our small block Chevy has too much power for the one wheel that is receiving the power in low grip situations.

If the vehicle is going to be as quick as possible we are going to have to limit wheelspin in corners and on the dragstrip. Take a look at the right rear tire smoke in that video and you’ll see why we needed to contact Quaife. The miles per hour on our timeslips indicate that if we can get both tires to transmit power to the ground, we’ll be much faster than the elapsed time indicates.

Our solution to that awesome and ridiculous one wheel wonder burnout is a new Quaife automatic torque biasing (ATB) helical limited slip differential (LSD).

We called upon Quaife for a few reasons. First being the reputation that their products carry. Quaife puts so much quality manufacturing and engineering into one piece of equipment, that the finished product looks like a work of art. All of the machined surfaces, gears and quality of metal are absolute top-notch eye candy. Quaife also offers a type of limited slip that is different from many other brands. You may have heard of a clutch type limited slip and you have probably heard of a Torsen type limited slip. A Quaife ATB differential is a “helical” limited slip.
Quaife_diff
What is that and why is it right for our/your car?

While traditional clutch type limited slip differentials use clutch friction packs that are compressed by the outward forces of gears and the inward forces of high traction tires (once again see our drivetrain explanation), this helical type of differential uses gears. The separation and compression of these gears inside of a machined pocket in the carrier together with side gears connected to the drive axles inside of the differential, automatically biases the power to the higher traction wheel. However, unlike some clutch type limited slips, not all the power is distributed to the higher traction wheel, and the benefit of an open differential being able to corner is still maintained. A gear actuated “helical” LSD also allows for automatic adjustment over different terrains. What that means is that in a rainy road racing environment with puddles etc. the lower traction wheel will not be the only one spinning, allowing for higher grip, better handling, and lower lap times. For drag racing, that translates to letting you lay down down two strips of rubber, like John force at the NHRA Winternationals.
Quaife-_internals
Other benefits of Quaife’s helical limited slip design over traditional clutch/Torsen type LSD’s, is no extra maintenance, no unique lubrication needs (i.e. friction modifier), and no wearable parts that will need to be replaced. It is smooth and quiet, and requires no break in period!

Why Quaife?
Since 1965 Quaife has been manufacturing the highest quality transmission and drivetrain components in the world. Through constant innovation, and improvement of quality and precision, they have found themselves as a worldwide leader in racing drivetrain components. All of the elements that go into manufacturing any of their products are sourced from the UK, and all of their ATB limited slip differentials are backed by a limited lifetime warranty. With Quaife’s Products enjoying success in Formula 1, rally, circuit racing, and rallycross racing worldwide, you can truly rely on them for quality and performance. They have applications for over 950 different vehicles just on the limited slip line of products.

Just as an example of their excellence in manufacturing, the following pic shows one of the Quaife differentials side gears (on the right) compared with a competitor’s gear (on the left) both for the same vehicle. The Quaife gear shows little to no sign of wear, no metal porosity, and an overall beefier design.
Quaife
Quaife has an in-house group of engineers and performance specialists constantly improving their already amazing products. Trust us, just holding one of the products in your hand you can feel the quality of workmanship. They’re on the cutting edge of computer aided manufacturing, and they feature in-house CNC machines in the creation and inspection of their products. What that means for you is the greatest quality products the first time, with a warranty and history to back it up! There is no corner cut and no steps skipped in creating any Quaife product. Their mission is simple, to continue to deliver the highest quality drivetrain components without any compromise. For more information, see their website via the link below, or contact one of their retailers.

The Next Steps:
Our new mission is simple as well! We will be installing this beauty into the rear end, then testing the difference it has made at the next NMCA WEST Drag racing event to truly show you the difference that a Quaife ATB limited slip can make for your car! Hopefully improving upon our best timeslip of 14.2 seconds at 101 MPH.

Along the way, we’ll walk you through how simple installing a limited slip is, and give you some feedback from our ride’s new toy.

Thanks again to Quaife USA!
(855) 417-4300
[email protected]
http://www.quaifeamerica.com/

Filed Under: Performance, Z cars

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