We are huge fans of the 1990-1996 Nissan 300ZX and this “Stillen GTZ” example is a unicorn among Z32s. In the early 90’s the GTZ was a limited run, special edition 300ZX Twin Turbo produced by Steve Millen Sportparts Inc. Only 6 GTZs were built in the series, and our client Mike B owns #6 finished in Diamond Black Pearl Metallic. Z Car Garage performed a mechanical refresh with dyno tuning to get it back in fighting form.
From Z to Super Z, by Stillen
Photo by Ryan Brackin
Steve Millen took Nissan’s World Class Sports Car and transformed it into the GTZ. Suspension, engine, transmission and aerodynamic upgrades used in developing this special 300ZX Twin Turbo could be found in Stillen’s performance catalog:
GTZ-specific parts included 17″ Billet Wheels…designed by Steve Millen and Elite wheels allowing 275mm-width tires:
Aerodynamics package highlights included the LeMans-inspired GTZ Rear Wing and GTZ turbo front spoiler that directed air into side-mounted intercoolers. Also shown are the vented front/rear fenders and louvered front panel:
Optional GTZ single tip exhaust system, fitting through GTZ Rear Valance opening. Performance upgrades included Brembo front brake calipers, EVC boost controller, HKS Boost and exhaust gas temp gauges. Catalog scans courtesy of Z32 enthusiast Jay S:
The GTZ received accolades from the press, with an orange example gracing the cover of Road & Track Magazine. Their April 1991 issue featured and extensive review of the car:
“It’s and absolute carnival ride to tip into the throttle, hear those twin turbos spool up and hang on as the GTZ reels in the horizon…a tractable, smooth road car that performs, handles and feels like a race car”
Motorweek put the Stillen GTZ up against a tuned Mazda RX-7 of the same area in their wonderful road test video, you can see it HERE. The GTZ is not to be confiused with the SMZ which was a special edition of the 300ZX that was produced in collaboration with Nissan to celebrate 25 years of the Z car.
Mike’s Z32 Story
Before we get into the mechaincal work let’s hear from Mike and how he acquired his 1991 Stillen GTZ…
“I was working in Phoenix during most of the 90’s in advertising and design for major automotive brands. My job was so stressful but at the beginning and end of each day I had a 30-45 minute drive home. I was driving a 1964 Triumph TR4 at the time and also a 1991 Crown Victoria Police Interceptor. I wanted a 300 ZX TT in black and then I would add all of the body stuff like wings and front valence etc later. Saw the ad for a Stillen GTZ in Autoweek magazine and bought it in 1994 with about 7,000 miles on it. It was like brand new.”
“I bought the car from a lady who had just moved back to Beverly Hills from Hawaii. While in Hawaii she saw the orange GTZ that was on the cover of the April 1991 cover of Road & Track magazine and wanted to have one built for herself. She called a Nissan dealer while she was in Hawaii that was in San Juan Capistrano, CA and ordered a Diamond Black Pearl Twin Turbo. She paid for it with a credit card. It cost about $40,000. It was then trucked to Stillen in Costa Mesa where the car was turned into a GTZ. She spent somewhere around $45,000 on the car to do that. She also had a car phone installed in the center console. It is still there and works. She also had TeleTrac installed which was a GPS tracking device in case the car was stolen, pretty rare at that time. Once the car was finished Stillen put the car in a wooden crate and it was air-freighted to Hawaii. She moved back to the mainland, got pregnant and decided the GTZ was not the car for a pregnant woman so she bought an Infiniti Q45 and had Stillen trick it out. I had the car serviced by Stillen, for the most part, while I was living in Phoenix.”
Mike recalls attending a Stillen Z meet in the 90’s and meeting Steve Millen for the first time with his GTZ. A recent visit to their facility in Orange County in 2022 yielded some great results:
“Steve Millen had sold the company and had moved back to New Zealand, but as I walked up the path to the front door of the shop an older guy was walking out of the building towards me….I was all…that looks like Steve Millen, and it was! We talked for a bit about the car and how he remembered it and the lady who commissioned it. He wrote a short letter for me stating that it was a genuine GTZ, number 6 in a series of 6 built by him. It also stated that my car was most likely the only one still in existence.”
The GTZ at Z Car Garage
We met Mike B in early 2022. He has owned this Z for 28 years and it was not running correctly so it came down to Z Car Garage from SF. We performed a full inspection, resolved some items while it was here and ordered several parts for it: “I was getting an oil change at a Nissan dealer south of SF a few years ago. While it was on the rack they noticed a few things that needed to be fixed. They didn’t recommend their dealer do the work and gave me Rob’s number and info. It was in the middle of covid so times were weird. They said Z Car Garage was one of the best in the country for Z work and I was happy to hear the shop was about 40 miles away from me. I went down to meet Rob and we discussed what should be done with the car to bring it up to snuff.”
The Z had an older exhaust system on it in rough condition. Rob had one in his parts stash so we hooked Mike up with a fresh Stillen axle-back exhaust system. We replaced all power steering hoses, rack bushings, valve covers, PCV valve, EGR, O2 sensors and everything under the plenum:
We installed Koni Yellow sport shocks F/R, lubed sway bars, and performed a full alignment. The passenger side door window motor failed, NLA but we had one and installed it. The oil was changed and car prepped for smog.
Dyno Tuning
With larger 740cc injectors we made a new chip so we could dyno tune it. It has a Greddy Profec b boost controller, set boost for 91 octane and made 310hp/352tq at the wheels. Solid gains over the baseline of 221hp/236tq:
The Stillen GTZ in action: walk-around, dyno runs and in-car driving with Rob and Mike B, enjoy!
Mike was really happy with the Z Car Garage service:
“Z Car Garage is great! I feel really confident that Rob does the best work out there and really knows his stuff. I took my car in for the boots etc and when all of the work was completed late last year my car was like a whole different beast! Rob did work on the engine like larger injectors and replaced all the fuel lines etc. He did some suspension work as well which took it to a whole new level. My first trip down to the shop, when the car was ready, Rob took me for a spin. That car had never handled like that before or performed like that. I think he said I got about another 100hp to the rear wheels after time on the Dyno. It was unreal to drive.”
“The engine pulls now like it has never before. The power comes on fast and it just feels like it can go and go! When Stillen first built the car they installed Bilstein shocks and Tokico adjustable struts. Over the years I had those replaced and the car never handled as well. When Rob was done with the car it now corners like it used to…like a road grader!! We took a corner near his shop at about 80, and this is a corner I’d usually take at about 40. It handled that corner like a race car, no body roll and tons of grip.”
With the mechanicals sorted, Mike went a step further and had paint and bodywork by our man William. Mike also had the original decals reproduced so the car now looks like it did back when it was built:
Mike’s GTZ at home in San Francisco. Although he’s owned it for nearly 30 years it’s time to let it go to another Z enthusiast. The GTZ is up for auction on Bring a Trailer right now! You can view the auction HERE
We enjoyed working your special GTZ, thanks for your support Mike and Long Live the Z! More photos in the gallery below:
Happy Friday from Z Car Garage! We are excited for 2023 and have many projects to share with you. Enjoy these photos from the shop today, Friday 10th with full reports coming to zcarblog.
The Bring a Trailer Datsun 240Z
The Bring a Trailer Datsun 240z is in for a checkup. This Z has seen a ton of driving events, rallyes and gatherings and featuers our ZCG Big-Brake kit.
Rick’s BRE 240Z tribute track car
Rick’s BRE-inspired Datsun 240Z track car just received our first set of Z Car Garage KW coil-over suspension from our latest batch. Clients that have already placed an order: kits will ship soon pending an instruction manual first. We also finalized the CD009 6-speed transmission swap on Rick’s Z that also features our (Race) Z Car Garage Big-Brakes.
Cameron’s Z32
Cameron’s Z32 is here for maintenance work and downpipes, inlet piping, larger intercoolers all from Specialty Z. Cameron has been bringing his 300 to us for many years and we we are really glad to have him back.
William’s Z32TT is getting 740cc injectors, downpipes and more:
Beau’s orange Datsun is 280Z coming together. Fresh from paint featuring Z Car Garage Big-Brakes, Z Car Garage CV Axles, T3 suspension and more. This 280 has many 240Z parts retrofitted and it will be cool hot rod.
One of the real joys this holiday season is the opportunity to say thank you and wish you the very best for the new year. From all of us at Z Car Garage we thank our friends, family and customers again for another exciting and productive year! Enjoy our 2022 recap and upcoming projects. Please note our holiday closure below:
ZCG will be closed from 12/26 through 12/30 for our Annual Holiday Break and we will re-open for business on 1/3/23
Client Updates for 2023
We had a busy year and though the shop will be closed, we won’t leave you hanging for the holidays. Many zcarblog features have yet to be published like our belated race report from the CSRG Charity Challenge and Finale in addition to client stories. Before we take a look back at highlights from 2022, here are several exciting projects coming along at the shop:
Jeff and Ryan B’s LS3-powered Z came to us for mechanical sorting. It’s now sporting our Z Car Garage Big-Brakes (for small wheels) and Z Car Garage CV Axles. Ryan successfully ran the Targa California Rallye in blistering summer heat. He recently got a new set of VOLK TE37V wheels full report soon!
At Z Car Garage we enjoy both modifying Z cars and restoring them back to factory spec. Mike’s 1970 Datsun 240Z came to us from North Carolina and we delivered it in July. This ’69 production VIN#193 is a beautiful driving example of how wonderful these cars were from the factory.
James’s Turbocharged L-series powered S30 will be back after some cosmetic upgrades. We enjoyed making some great power and music:
Rick’s BRE-inspired Datsun 240Z track car is getting a CD009 6-speed transmission, Z Car Garage Big-Brakes, coil-over suspension and track preparation.
Ken’s Series 1 Datsun 240Z (#1762) is getting our Z Car Garage Big-Brakes, ZCG CV Axles, KA24 5-speed transmission and Fujitsubo exhaust. The L28 is now receiving Jenvey ITB EFI managed by a Haltech 750:
Beau’s Datsun 280Z coming together. Fresh from paint featuring Z Car Garage Big-Brakes, Z Car Garage CV Axles, T3 suspension and more.
Taking care of clients!
Z Car Garage takes pride in our ability to handle client’s needs, with same-day service possible. Our parts room with over 1,000 parts on hand allows us to get you in and back on the road. Client Vince S had a clutch hydraulic failure and limped his way in to the shop. We sorted his hydraulics and he was off in 4hrs:
Stan K (VIN #511) and Tony H’s Series Datsun 240Z cars came in for mechanical sorting, interior work and Z Car Garage CV Axles
Datsunworks
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. You can read all about it HERE. We continue to extract more power and run longevity testing with owner Gary’s Datsun 240Z, who has the pleasure of living daily with this beast affectionately named the “Behemoth”.
Khang’s 1973 Datsun 240Z was completed in October and he returned with 1,000 miles on the 3.2L L-Series. We adjusted the valves and double-checked power levels.
Happy to see both builds healthy and confirm power output. Enjoy the music from the both L-Series engines, sporting Jenvey ITB EFI managed by Haltech 750 Elite ECUs backed by the CD009a Six-Speed transmission.
Dyno Tuning your 350z/370z/Q/G
We have been dyno tuning your late model Nissan/Infiniti sports car daily. Bolt-ons, UPREV tuning. Our customers leave happy with more performance. Call us to schedule an appointment! Here are just a few cars:
Eric’s Q50:
R35 and R32 GT-R
R35s in for service and upgrades. Mike and Kurt’s R32 GT-Rs got power and chassis upgrades deserving their own blog features:
Z32
Mike’s 1991 Stillen GTZ. This rare, twin-turbo Z32 300ZX is #6 of 6 cars created by Steve Millen. It featured special 17” billet wheels, Brembo brakes, aero and performance upgrades. Excited to share its story and other client Z32 projects!
Race Cars
Several race cars to report on including the Transcendental Racing Datsun 240Z, Glenn Chiou’s Ex-Finn/Harris U2.5L Trans-Am ’68 510 (sporting ZCG CV Axles), the Corky Bell Trans-Am 510 and more!
Highlights from 2022
Even though 2022 was crazy year for all of us we still managed to have fun on and off the track. The shop made some really great progress as well. Enjoy these highlights from the year and Z you in 2023!
Click on each link or photo to see the full features!
The New Nissan Z
Huge thanks to Nissan for giving us the opportunity to experience the 2023 Nissan Z. We really can’t wait to get our new Z!
Jack Atkinson, friend, extraordinary designer, fabricator and creator of the Primadonna Z, left this world on July 15, 2022. He was 68. Jack and his wife Yolanda have been a part of our lives since the beginning of Z Car Garage. We send our deepest condolences to Yolanda and their family.
Being lifetime members of The Z Owners of Northern California (ZONC) and supporting our shop along the way, we are forever grateful to them. This is our tribute to you, Jack. We miss you and know you are out there Enjoying The Ride!
Design and Fabrication
In the automotive space, Jack was a visionary designer and self-taught fabricator. Many enthusiasts in the Nissan/Datsun community to this day are still impressed with his iconic “Primadonna Z” based on the 1970’s Datsun 240Z sportscars. This is a very special Z car with a history that will be shared in a (deservedly) separate blog post. Briefly, Jack Atkinson built three totally custom 240z cars in the early 80’s. In 2021, Z Car Garage helped reunite Jack and Yolanda with his first Primadonna Z build:
Heavily influenced by the wild IMSA Z ‘s and Porsche 935 bodywork, Jack hand-fabricated the body pieces and affectionately named the cars “Primadonna Z’s”. Only three Primadonna Zs were made. This red car is the first one Jack built, here is a period photo of it:
Jack would go on to build and eventually sell the Primadonna kit, spawning black and white versions:
The whereabouts of the black and white cars have been fairly well-documented over the years, eventually landing (and thankfully) in the hands of caring owners. The white car (known as Jettlag) and red car (known as Z Bait) are currently with Eric and Allison Knutsen of Southern Florida Z. We have so much to tell you about this car’s history, from its current whereabouts back to inception in the skillful hands of Jack. For now, a nice primer can be seen HERE.
Datsun Destiny
Thirty-six years later Jack was reunited with his first creation, Primadonna Z #1. The Z arrived at Z Car Garage and we were able to get it started and take both Jack and Yolanda for a spin. It was incredible to see this Z in person and even sweeter to witness the reunion. This would be Jack’s last ride in the car he built by hand before he passed.
Here is short video of Rob and crew getting the Z started and rolling on the street:
Back in Z Game
After a 20 year hiatus, Jack’s creative mind and passion urged him to get back into modifying Z cars. This time he chose the Nissan 300ZX (Z32) as his canvas, building two “Primadonna Z32” sportscars.
The first Z32 was a 1993 convertible (above) that was transformed into a widebody with several iterations of livery, wheels and color schemes. That was Jack: always seeking to improve his designs:
“I wanted to take an already nice looking Z and make it look like a super car. Even though this car is a one off, my insurance is the complete set of molds, from which the components you see were made. I made the fiberglass molds from the hand-sculpted prototype body of wood, aluminum, styrofoam, fiberglass and bondo. Body components were constructed using hand laid S-Fiberglass, Carbon Fiber and Kevlar and rolled out with a high temperature resin.”
The build started in July of 2005 under a canopy in his backyard and took 6-months to complete-including paint. Below, build documentation and the Primadonna Z32 in all-black:
The second Z32 was a 1996 Twin-Turbo with only 13,400 miles on it. This stunning ZX was one of the last Z32s to roll off the line (#247 of the last 300) and Jack’s hand-made body-work highlighted the car’s lines, while leaving the ‘looks-new’ interior in full view through the windows and t-top. Jack garnered many awards for both Primadonna Z’s including Best of Show and First Place at ZDay in Pismo Beach:
Jack’s LS3-Powered Z32
Jack developed a love for Corvettes and we helped him bridge his passion for the Z by performing an LS3 engine swap into his Primadonna Z32 Convertible. This was a dream come true for Jack, earning him a prize in the Z32 Ultra Modified category at ZCON 2021. Here are a few photos of us wrapping up the LS3 swap with road-testing and dyno tuning. Full report soon!
It even sports full A/C and OEM shifter for the automatic transmission. The Z was loaded up with the OMS pace car and heading to ZCON 2021! You can hear Rob discuss Jack’s LS-powered Z on this episode of Hoonigan Autofocus with Larry Chen from the 34th Annual Z Car Convention (ZCON) hosted by ZCCA in Colorado Springs.
Fellow Z car enthusiast and ZONC board member Ann Devor on Jack’s creative work. Jack inspired many Z-car enthusiasts, including younger folks:
“Jack, with Yolanda’s assistance with fiberglass molding, designed and fabricated all manner of auto body parts – fenders, noses, tails, splitters, wings, all to accommodate the bigger wheels that were necessary for his aerodynamic designs. And the wheels were big! Wheels for Jack’s cars were custom made and it was always one of his favorite jobs to put his new wheels on for the first time. And to his last days, he wanted a set of new wheels for one of his cars. Jack was always thinking about the next big thing he wanted to do, whether it was a road trip or a new design for a car.”
“When Jack started working with vinyl applications and graphics, a whole new world opened up and added to Jack’s already respectable number of design innovations. Jack’s cars visually popped with their huge wheels covered by muscular fenders, big wings, splitters just barely clearing the asphalt, and car paint clothed in colorful spears, stripes, arrows, and emblems. There is nothing else like Jack’s cars.”
Roadtrip Leader
Some of our greatest memories of Jack are the numerous roadtrips he led (with Yolanda’s help, of course) with ZONC. These memorable drives would kick-off at Z Car Garage, with Jack briefing a large group of enthusiasts. You could also count on seeing Jack’s car equipped with a CB radio antenna, whether it was a Z car or NSX. This desire to share the road and its adventures carried with him later in life to the Santa Clara Corvette club where he would lead them on epic cross-country drives.
Datsun Family
Jack and Yolanda have supported Z Car Garage since we opened our doors in 2004. They helped us design and produce special t-shirts and swag (more on the way!) that you may have seen at various race events and gatherings. We are forever grateful for their friendship.
Love. Jack and Yolanda were in love for 43 years. Their partnership was inspirational, doing everything together including working side by side as business partners and enjoying automotive hobbies. Indeed, it was tough to get a picture of them apart, so most of my photos are of them together 🙂 Here are Jack and Yolanda in 2008 at a Z Car Garage dyno day, in their NSX:
We Miss You Jack
On October 22, Z Car Garage attended a Celebration of Jack’s Life in Bakersfield, Ca. There was an incredible outpouring of love from friends and family at the event. Jack’s passion and love for sharing spanned across different marques, eventually reaching NSX and Corvette clubs.
The celebration of life also brought people together. We met Eric and Allison Knutsen, current caretakers of the Primadonna Z cars all the way from Florida. The parking lot was a mini car show with Jack and Yolanda’s cars as well as friend’s rides. We think Jack would be right at home seeing the gathering of cars and people. Enjoy the photo gallery below:
Jack is at peace, and his story will continue to be told. We were fortunate to be in his presence and cherish the time we spent Enjoying The Ride. He truly embodied the words Mr. K said best, “Love cars. Love people. Love life.” Our sincerest condolences go out to Yolanda and Jack’s family. We will miss you Jack!
