Z Car Garage is excited to collaborate with Datsunworks and develop their brilliant KN20 dual-overhead cam (DOHC) cylinder head designed for the Nissan inline-6 L-Series engine.

 

Datsunworks founder Derek Minetti is the pioneer behind the KN20 DOHC cylinder head. This is a custom (very limited production), 6-cylinder head derived from Honda’s venerable K-series 4-cylinder engine. The KN20 offers superior head flow rates combined with modern valvetrain components to effectively transform your L-series single-overhead cam into a high-revving, dual-overhead cam engine. The power potential is impressive.

Gary’s Datsun 240Z

 

There are ten KN20 heads in the wild with only three installed and currently running in cars. Z Car Garage has two KN20 cylinder heads. This KN20 is serial #SN10 and it has been installed into our long-time client Gary’s Datsun 240Z, affectionately named the “Behemoth”. ZCG is always exploring the boundaries of powertrains and Gary’s Z has seen a few engines including an RB30DET, OS Giken TC24 and now the Datsunworks.

 

Here are few details on the powertrain setup for this Z:

-Rebello 3.1L Engine

-KN20 Cylinder head SN10 (but the performance level goes to 11)

-Induction type: Jenvey ITB EFI with Injector Dynamics injectors

-Engine management: Haltech Elite 750

-Header: Equal-length, custom fabricated by RacecraftNW

-Transmission: Nissan CD009a

-Rear Diff: R180 4.11 OS Giken LSD

 

Pictures of the initial engine installation, with more in the gallery:

 

For further information on the KN20 cylinder head we urge you to visit the Datsunworks blog:
Datsunworks Blog

Performance

 

We are still in the tuning phase so Gary’s car is on a comfortable (conservative) setting. With the Datsunworks head it made 350hp/248tq at the wheels on 91 octane:

 

Even in a testing stage it is absolutely thrilling to drive. Gary’s car is a full ZCG-style restoration so it has the chassis to harness the power. The sound it makes is a sonorous tone only the K-series derived KN20 head creates…with a gnarly exhaust note to match. The ITB induction also provides a healthy wail…it’s a sensory overload and revs seem to climb endlessly.

 

To illustrate the Datsunworks experience we captured some video of what it is like to drive around town…the 6-speed and EFI really allow this car to be docile, especially when cruising on the freeway and at part throttle. Drop a gear and its becomes a wild animal. Not going to lie…it gave me goosebumps both as a passenger and spectator.

Watch the video complete with multiple dyno passes, street acceleration and fly-bys. VOLUME UP!

 

 

Potential

 

Z Car Garage is stoked to be a part of the Datsunworks KN20 development. It is a clever design that pushes the envelope for L-Series engines. Sharing this experience is also part of the fun so we anticipate having a KN20 setup in a dedicated shop 240Z for clients to test drive and further evaluate. Although each application is different, we envision offering a bolt-in setup for your six-cylinder L-Series engine. The power potential is tremendous with the KN20…both NA and forced induction. We thank Derek at Datsunworks for giving us the opportunity to work with this innovative product.

 

Stay tune for more updates and LONG LIVE THE (TWIN CAM) Z!

 

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What sparked your interest in Z Cars? For Scott W it began when he was about 15 years old, and eventually led him to Z Car Garage:

“My best friend’s brother’s friend had a silver 240z. He would take us to lunch and we had to lay down in the back. From that time on I wanted a Z! I started reviewing zcarblog.com and found a very nice 260z for sale that was owned by an older retired couple. Based on all the work performed by ZCG I met with Rob and I purchased it. The 260z was originally gold with the 5mph bumpers.”

 

Indeed the gold 1974 260z was our very own customer Geri R’s. When she retired and moved to San Diego she told Rob, “If you are not in SD my Z car can’t come with me…please find it a new home.” Scott W visited ZCG in 2013 and purchased the Z, well before the S30’s garnered high prices! He had a very clear vision of building the ultimate Z Car:

“I told Rob my plan was a car that was great to look at but I’m going to drive it! And drive it hard. My goal was to keep it looking 1974-ish on the outside but modern under the skin.”

So we began the process of upgrading an already solid, clean chassis that Geri lovingly maintained.

Drivetrain

The first item we discussed was the engine. Scott wanted more power and Rob suggested a Rebello 3.2L Stroker engine. Supporting parts included an MSA 6-into-1 header,  ZCG exhaust system, KOYO race radiator (custom upper hose) and ZCG heat shield. A few pictures of the engine build/installation with many more in the gallery:

 

Induction is handled by Jenvey individual throttle-body fuel injection, managed by a Haltech Elite 750 standalone system.

 

A NISMO Competition oil pan was installed to cope with high cornering loads from road course driving. Also shown is the Nissan 240sx 5-speed transmission. This “KA24” unit is significantly stronger than early S30 transmissions. It handles the 3.2L’s extra power, and we offer this conversion to customers.

 

When we upgrade the transmission we also install a JWT HD clutch with aluminum flywheel. Helping put the power down efficiently is an OS Giken LSD. The R180 houses a 4.11 R&P and the assembly is setup in-house (by Joshua Corwin). Rounding out the drivetrain upgrades are a set of ZCG CV Axles(shown below)

 

The ZCG Exhaust system using 2.5″ piping to a stainless resonator and Magnaflow muffler with slash-cut tip. Listen to the sound in the video below!

   

The completed engine bay. All hoses, hydraulic lines, fittings etc were removed and restored/replaced with new parts. Zinc plating hardware throughout:

 

On the dyno, Rob tuned the Z with the Haltech making 257hp/229tq to the wheels. An improvement from the stock 121hp/130tq:

Chassis

 

Suspension upgrades were next, focusing on the ideal setup for open track days while remaining comfortable on the street. Scott outgrew the Tokico 5-ways and now has Koni Yellows with our Ground Control coil-over setup from back in the day. Techno Toy Tuning control arms, T/C rods and more complement the total suspension restoration. All parts were powdercoated and hardware plated.  We really appreciate Gabriel at T3 and his staff. They make some of the best suspension parts out there for Z cars.

 

Panasport Wheels

 

Custom sized 17×9 Panasport C8 wheels allow us to run a wide 255/40/17 tire at all four corners, without flaring the fenders:

 

Bridgestone RE-71R tires are shown below. The 17″ diameter wheels also give clearance for our ZCG Big Brakes!

  

ZCG Big-Brakes and CV Axles

After driving our customer Lou’s Fairlady, Scott was sold on our Z Car Garage Big-Brakes.

  

Not to be confused with our familiar Z Car Garage Big-Brakes (for small wheels) that we currently offer, this Big-Brake kit was our initial setup from many years ago. Our first collaboration with Stoptech, this 328mm sized kit requires 17″ diameter wheels and the massive ST-42 calipers are finished in bright red. This kit was installed on our OS Giken TC24-powered 240z and a few other customer cars.

 

 

The ZCG Big-Brakes framed nicely behind the black-spoked C8s. We are currently re-vamping this kit using Stoptech’s latest ST-43 caliper.

    

Our Z Car Garage CV Axles help transmit power to the ground and ensure smoother operation compared to your standard half shafts. We have over 70 CV axle kits on customer cars and we are stoked with all of the positive feedback.

   

Scott’s 260z received ZCG CV Axles set #250

  

More pictures of the ZCG axles installed, also visible are the T3 control arms and ZCG exhaust system:

  

Comfort

 

Scott’s 260z had an interior in fair shape. We gave it the full ZCG treatment with a refurbished dash, new carpet and creature comforts like Bluetooth, radar detection and functioning HVAC. In-progress shots below with more in the gallery:

 

New carpet throughout, integrated speaker box in hatch:

 

The stock seats were in bad shape Scott was sliding around on them so we upgraded to leather Recaros. Perfect for keeping him locked in place during track days.

 

The heater system from core to blower was completely restored:

 

Full A/C setup using a smaller Toyota compressor with existing A/C parts:

 

Performance

 

Balance. This Z has power and the chassis upgrades to transform it into a well-rounded sports car. Remember Scott’s goal of building the Z to drive really hard? He has been taking his S30 to Buttonwillow Raceway every month, putting our ZCG products to the test on the track.

 

Enjoy the sounds of Scott’s Z in this short video below:

 

 

Exterior

 

You didn’t think we would forget to mention the total paint color change, did you?  About six months into his build Scott called to request a color change from gold to a Mercedes-Benz shade of Gun Metal. Our man William painted the body, retaining all side-markers to maintain a stock look:

 

Scott however was adamant about changing the stock impact bumpers. Rob located Euro-style 240z bumpers and had them sectioned/re-chromed:

 

Thank you Scott for letting us build your Ultimate Z Car! We are proud to see you enjoy it on the track and street.

LONG LIVE THE Z!

More pictures in the gallery below!
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Every year we have a local Holiday light show called the Fantasy of Lights at Vasona Park. It’s a drive-through event and I always wanted to take my family in the roadster.

  

Last week we did it! Fun for the wife and kids and a bit emotional for me…15 years ago Rob Fuller handed me the keys to this newly SR20-powered Datsun and it’s been an integral part of my life ever since.

Enjoy the video:

 

Happy Holidays🎄 and Happy New Year! We hope you you can Enjoy The Ride with family and friends.