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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The iconic, 1976 IMSA GTU Championship-winning Transcendental Racing Z is at Z Car Garage! This early 1970 production 240Z has an exciting history battling against factory-backed teams with names like Jack Scoville, Brad Frisselle and John Morton behind the wheel.

The chassis was also highly-developed by a team of All-Stars including Joe Cavaglieri (Crew Chief), John Knepp (engine), Trevor Harris, Mac Tilton (suspension) and Yoshi Suzuka (chassis, roll cage and body). Current owner Randy Jaffe has commissioned Z Car Garage to bring this Z back to period livery, refresh the chassis and drivetrain components, and re-assemble the interior before traveling to its new home in Atlanta.

The Z came with many spares, period photos and even original molds for the bodywork!

Getting the livery sorted has begun, with a proper “Frisselle” windshield banner (left) based on period photographs (right)

Here is a short video of the Z as it arrived to the shop early this week. Dyno testing with video coming soon!

Always Meet Your Heroes

The “Frisselle” car captivated us for many years. We watched it race locally and and eventually shared track time with previous owner David Martin (RIP) at major historic events. (Below, Left) David Martin and Rob Fuller (#49 Joel Anderson car) in the Corkscrew and (Right) Rob with David and Brad Frisselle at the RMMR 2018.

You can imagine how excited we are to have this iconic race car at Z Car Garage. Big thanks to Randy for always believing in us. More photos from my brief visit:

Enjoy these videos we’ve captured over the years racing with David Martin piloting the Transcendental Racing 240z:

In a moment of sheer happiness, Rob Fuller can be seen driving the #47 Brad Frisselle Z through the paddock back in 2015!

A David Vs. Goliath History

Ever wonder about the history behind this famous 1976 IMSA-GTU Championship-winning 240z? Check out www.my240z.com. Our friend Glenn Chiou created this website to document the racing provenance for previous owner David Martin (RIP):

Glenn’s impressive knowledge of historic Nissan/Datsun racing is bolstered by hundreds of scanned photos, some never seen before along with stories from ex-drivers Brad Frisselle, Jack Scoville and John Morton. We are even given new insight on the R&D effort that went into the Frisselle car making it by far, “the best race engineered 240z in its period”.

So if you want to know “what’s it all mean?” check out www.my240z.com!

LONG LIVE THE Z!

On June 5-6, the Classic Sports Racing Group (CSRG) hosted the Vintage Races at Laguna Seca. Z Car Garage was fortunate to participate and support several client’s Datsun 510 race cars running in B-Sedan Group 9. It was a great weekend filled with competition, camaraderie and plenty of Alfas, BMWs and Datsuns sharing the track. Enjoy our report with photos from photographers Raj Narayan, Nick Dockery and Jim Rose plus exclusive in-car footage!

Z Car Garage Supports Two Datsun 510s!

It is our pleasure to bring more enthusiasts into the world of vintage racing. Our services do include full race support and car-preparation to help make client’s race days seamless and worry-free so they can focus on driving. One of our specialties is dyno tuning. Before a race weekend we confirm that your car is running well and make necessary adjustments while on the chassis dyno. Below is a video of two Datsun 510 B-Sedans (Rob and Tom) on the dyno prior to the Speedfest weekend. Enjoy the sweet L-series music!

510s Galore!

Plenty of Datsun 510s in Group 9, it was a Dime-lover’s dream to be in the paddock and watch the races. Although the event did not officially allow spectators, we’ve got you covered! Let’s take a look at the Datsun 510s that we supported, beginning with our clients. Both cars ran flawlessly:

#72 Tom Dockery

Tom Dockery drove his Ex-Norm Balzer/Koobation 510. This car made its debut in May 2019 and we are excited to share its full story and profile Tom’s journey into racing.

“Overall, the weekend was great.  Smaller field but the top half of the field was equally fast. I had some good exchanges with Jon Normal, whom I never expected to be able to keep up with, so that was fun. Some dicey moments with Daniel Cagginao, thought his lines were a bit off (Sun race 2). I managed to set a new personal best lap time of 1:46:09 which was great.

My other comment would this ….Every time I watch these in car vids ….and I watch them all the time just to hear the noise/sound, I see places I gave time away and I just want to go back out again. It’s intoxicating. My car was perfect, no issues and ran in top form all weekend long thanks to Josh and Rob.”

#7 Rob Fuller

With the assistance of ZCG crew Josh and Keith we also supported ZCG owner Rob Fuller in the Bay Area Datsun Dealers tribute car:

Photo by Jim Rose

 

Rob performed admirably with a fastest time of 1:41.837, here is his experience:

“CSRG is one of the oldest race groups that we run with. It’s been 20 years since they had a Laguna Seca event so we were excited to participate. They had 9 different run groups and I have been pushing to make Spec Miata part of vintage racing. We tried to get a big group out, but only two Miatas raced with Group 8 (Tim Wright and myself). Despite this, it was fun to start at the back and move through the cars”

  

“The big excitement of course was B-Sedan group. Tom Dockery was quicker than ever, and I was getting closer to Troy Ermish. We really had fun, dramatic racing. First race out (qualifying) I was close to Troy. He and I were a good 3-4 seconds ahead of the field with a nice battle. Race 2 I had a good start and took off, then about lap 4 my car’s transmission got stuck in 3rd gear. We  were so far in front that even with 5-6 laps left in race I was able to adjust my driving style and finished in 2nd place. Pretty proud of that.”

Photo by Jim Rose

Race 3 on Sunday was dramatic. Troy and Rob were just .033s apart at the finish!

“In the 3rd and final race (afternoon feature) Troy and I battled again. He started to gap me but car issues slowed his pace. I started to reel him in. The last lap was the closest I’ve ever been to Troy (see video below), and it’s no secret that he’s a phenomenal driver. I definitely want to catch cup to him and race with him when our cars are both 100%.”

You can see in-car footage of Rob below:

Catch more of Rob’s sessions on his Youtube Channel. Race Results from the Group 9:

Datsun Car Corral!

CSRG is awesome. Since the general public was not allowed to spectate, they hosted a vintage Datsun Car Corral! Participants were spoiled with FREE parking in the paddock area and full access to the race for the weekend.

Willie Gutierrez brought his Datsun 510 along with a few friends. My roadster friend Raj Narayan (photo contributor) also attended in his 2000.  They got to enjoy the beautiful weather and day of racing without crowds…amazing!

Cool Cars

The paddock was filled with wicked metal. This special Datsun Roadster is a factory “lightweight” model, piloted by Michael Sweeney. More pictures in the gallery!

Photos By Raj Narayan

Thank you!

We hope you have enjoyed our report from the 2021 CSRG Vintage Race event! CSRG did an amazing job with the event. Rob’s parting words:

“It was fun to catch up with friends like the crew from Racecraft.  Ex-driver of Tom Dockery’s 510 John Koobation was there. I enjoyed racing Miatas and hangin out with Tim Wright, a famous musician from 3rd Eye-Blind and Primus. We hope October’s event with CSRG will be open to spectators!  Our client Kelvin missed this event but assures us he’ll be racing at Sonoma. None of this would be possible without the help of our ZCG crew Josh and Keith Corwin. If you haven’t experienced a Historic racing event I encourage you to come out, it’s a blast!”

*See you in October for the CSRG Charity Challenge in Sonoma!*

The stories behind every Z car and their owner play a huge part in our love for keeping them on the road. The Nunes family has owned this 1978 Datsun 280Z 2+2 from new, starting with Gilbert and soon to be passed on to his son Dillon. This S30 was treated to a ZCG-style mechanical restoration including a new drivetrain, engine bay restoration, our Z Car Garage Big-Brakes and Z Car Garage CV Axles, total suspension rebuild and more.

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We admire the 280z cars (see Cece, Greg and the Roth’s builds) and met with Gilbert to discuss his needs. Updating the Z while preserving the exterior patina was the vision. First, let’s take a look at the Nunes’ family history with their Z.

From Father to Son to Grandson

Gilbert recalls how he got the Z:

“It was Christmas of 1977 and my parents decided to reward me for doing good during my first year of College at San Jose State. On Christmas Day by surprise I was handed a little box with keys in it. They knew I wanted a sporty car, but they had their own requirements. My dad wanted it to be an automatic, and he wanted a back seat so our whole family could fit in the car. The first attempt at buying a 280z didn’t work because of a dumb salesman at Downtown Datsun…

 

…They went there and asked to look at the Z’s however the salesman didn’t want them to buy a Z thinking they were too old for one. So they went to Stevens Creek Datsun and found a salesman who was dying to sell a car since Christmas was close. So in no time at all they found a automatic 280Z 2+2. I had no idea of the color or exactly what I was getting when I pulled up to the dealership, but I was very happy with the car.”

  

Gilbert would daily drive the Z that he got from his parents for 30+ years. His son Dillon grew up in the back of the 2+2 and has fond memories:

“My dads 280 is actually still in his possession, it will be left to me some day. I have a lot of stories from growing up in this car, mainly being a little kid and my dad letting me ride in the backseat with no booster seat because the seats are small enough. I remember of my dad driving my sister through a decent sized flood making sure she made it to her piano recital, all in the Z…

 

…I was very excited about getting my Dad’s car restored (it’s something we have literally talked about for 20 years). I’m not sure how he heard of Z Car Garage but I know I have been going there almost all my life. My earliest memory at ZCG was at a Friday car meet (Our 5th Anniversary gathering) where bbq burgers and hotdogs were being served. I was about 12 years old, and loved seeing all the Z’s and other Nissans, especially the GT-Rs.”

The Nunes family dropped off their beloved 280Z at the shop and the transformation started.

 

Drivetrain

Gilbert’s Z received a total engine bay restoration along with upgrades to the driveline for smoother driving and improved torque. Please visit the gallery below for more pictures documenting the engine bay restoration work, it’s where our efforts shine!

Engine

 

A fresh 2.8L  “street” engine with replaced the tired L28 (above), new L28 below:

   With the engine/transmission removed we focused our efforts on restoring the engine bay. Everything was zinc plated or powdercoated. New parts included brand new injectors, all new fuel system, hoses, fuel filter and all the drive belts.

 

Intake manifold cleaned up and powdercoated:

 

An MSA exhaust header was installed. Powdercoated and plated parts laid out for installation. We bag/tag every nut and bolt:

 

All new hydraulic lines, emissions plumbing and more engine bay clean-up (full re-paint by our man William) before/after. More pics in the gallery!

  

More detail work:

 

Engine bay restoration, before/after:

   

Suspension

 

Gilbert wanted a fantastic driver that was worry-free. We replaced all of the hydraulics and front/rear suspension assemblies to match the new driveline.  All suspension was either zinc’d or powdercoated:

  

We installed KYB strut inserts with lowering springs, Suspension Techniques sway bars, Techno Toy Tuning adjustable rear lower control arms, TC rods, and rack bushings, all new wheel bearings and new ball-joints. We do offer a full coil-over setup for track day/performance-oriented customers, and this spring/strut upgrade for those that want a better stance with improved handling without getting beat up.

Suspension refresh with T/C rod and steering rack detail:

        
Rear end with T3 lower control arms in:

 

ZCG Big-Brakes and CV Axles

We are proud to have several of our ZCG products on Gilbert’s 280z. We installed our Z Car Garage Big-Brakes (for small wheels) and also upgraded to Z Car Garage CV Axles! These products have been standard on numerous ZCG builds.

     

As fellow S30 owner/racer Glenn C mentioned in his review, on top of braking performance, pedal feel is extremely important and our Big-Brakes deliver. This is a direct result of working with Stoptech to create a totally bolt-in solution requiring no M/C change or additional proportioning valve/adjustments. All fitting behind a 15″ Watanabe or Panasport wheel and retaining factory emergency brake lever! A few details below:

Calipers: Stoptech ST42 4-piston front & rear race calipers (Alum 6061 mil-spec Type III anodized)

Rotors: 280mm x 20.6 with Alum 7075 hats

Pads: Stoptech 309 sport street pads

Blog posts documenting all of our customers running the ZCG Big-Brakes can be found HERE.

A few closer detail shots of the calipers, rotors and hardware:

 

We went ahead and got Gilbert dialed in with the ZCG big-brake kit for small wheels with parking brake and a new brake booster/master cylinder. More pics in the gallery!

  

Front brake installation:

 At the rear, the factory drum brakes were replaced with our ZCG Big-Brakes. Factory handbrake functionality IS retained!

    

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 130+ CV axle kits on customer cars and we are stoked with all of the positive feedback.

 

Gilbert’s standard half-shafts shown on left and ZCG CV Axles on right. Also note plated brake lines:

 

Panasport Wheels

   

Our ZCG Big-Brakes also look great behind Panasport wheels in our offset allowing us to run 225/50/16 tires (Bridgestone S-007a). Gilbert really wanted black so we had the spokes powdercoated in black with the polished lips cleared…they look sharp!

 

Details

 

The little things are what we excel at. The rear differential was refurbished. All electrical connections re-done. The original A/C system was retrofitted to use R134a refrigerant and made to blow super cold. New battery cables and wiper blades. We also replaced all of the fuel vapor hoses in the hatch. Please check the gallery below for more detail shots, there are too many to list in this blog post!

Enjoying The Ride

 

Gilbert’s son Dillon came down to ZCG pick up the 280. He was impressed:

 

“As far as how the car performs, its amazing. I have taken the car on a few drives and from my perspective the car corners like its on rails and stops on a dime. I took it up Sierra road and had a blast, still waiting to take it up highway 9. I was also surprised by how smooth it was driving on the freeway to a car meet at the USS hornet. With the stiff suspension I expected an unpleasant ride all the way to Alameda but was pleasantly surprised at how smooth it was cruising at 85mph on 880. My only complaint is the auto trans, I would personally prefer to have it converted to a 6 speed that I have seen on your blog but my dad hates manuals:(“

 

Dillon and the Z at the local VALT Cars and Coffee in Alameda:

Here is a short video from Dillon shortly after picking the Z up:

Gilbert is enjoying the Z as well!

Thank you Gilbert for letting us re-birth your Z car. It makes us happy to see it being driven and soon passed on to your son Dillon. ZCG is honored to help keep the family Z on the road.

LONG LIVE THE Z!

 

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