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May 12, 2025

Hiroshi Tamura, known globally as “Mr. GT-R”, joins Toprank as the official Global Brand Ambassador



TOPRANK Corporation is pleased to welcome Mr. Hiroshi Tamura, former GT-R and Fairlady Z Chief Product Specialist and Brand Ambassador of Nissan Motor Co.

On April 25, 2025, Mr. Tamura visited TCS (TOPRANK CLASSIC SPECIALITIES) and gave us a message for his appointment as an ambassador. Please watch the video.


❏ Our Vision Passing on the universal appeal of neo-classic cars to the world and to future generations Passion for continuing the legacy of Japanese cars on the worldwide stage

❏ For more information, click here. https://toprankglobal.jp/news/671/?ut... ------------------------------------------------------------------- このたび株式会社トップランクでは、日産自動車株式会社のブランド・アンバサダーで、前GT-R及びフェアレディZ 統括責任者である田村宏志氏を、ブランドアンバサダーとしてお迎えすることとなりました。

2025年4月25日には田村氏がTCS(TOPRANK CLASSIC SPECIALITIES)を訪問、アンバサダー就任に向けてのメッセージをいただきました。ぜひ動画をご覧ください。 ❏ 私たちのビジョン ネオクラシックカーの普遍的魅力を、世界へ、後世へ Passion for continuing the legacy of Japanese cars on the worldwide stage ❏ 詳しくはこちら https://toprankglobal.jp/news/670/?ut... ------------------------------------------------------------------- Toprank Global is your one-stop shop for finding and importing your dream car from Japan, anywhere in the world! We handle everything from sourcing your perfect vehicle to navigating the shipping and import process.

Here's how Toprank Global can make your dream a reality: •Vast Selection: Find your ideal car from our curated stock, or through a personalized request. •Military stationed in Japan? We can deliver a car with Y plates and JCI , ready to drive on Japanese roads. •Financing & Appraisal Support: Considering loans from Navy Federal or Penfed? We can assist with vehicle appraisals. •Not-yet-importable cars? We offer secure storage in Japan for vehicles under 25 years old. •Global Shipping: Live in a country with no 25-year import restrictions? We can ship your car directly to you.

Worried about the import process? Don't be! Toprank Global handles everything, from inspection and purchase to cleaning, shipping, customs clearance, and more. Ready to get started? •Browse our stock: https://toprankglobal.jp/ •Search Japanese auctions: https://toprankglobal.jp/ •Make a personalized request: https://toprankglobal.jp/request/ •Contact us: trade@toprank.jp

Follow us on social media: •Instagram:   / toprank_global   •Facebook:   / topranktrading   Let Toprank Global be your guide to owning a piece of Japanese automotive history!

Buy USA Legal R32, R33, and R34 Skylines at Toprank Importers!
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Nissan Skyline Parts and Toys

2025 RB26 Spark Plug & Ignition Guide For R32, R33, and R34



📝 Overview

This 2025 update consolidates accurate specs, best practices, and field-tested options for spark plugs and coils used in Nissan's RB26DETT engines across the R32, R33, and R34 Skyline GT-Rs. We've included NGK designations, heat ranges, vehicle compatibility, and why reach and coil fitment matter.

BCPR7EIX from Brian's R32 GT-R

🔩 Spark Plug Specifications

FeatureValue
Thread Size14 mm
Hex Size16 mm (5/8")
Reach19 mm (JIS "C" type)
Seat TypeGasket
OEM Gap1.1 mm (PFR6A-11)
ResistorYes (required for EFI/ECU)
BCPR7EIX - great one heat range cooler than stock spark plug for Nissan Skyline GT-R

Applies to:

  • R32 GT-R (1989–1994)
  • R33 GT-R (1995–1998)
  • R34 GT-R (1999–2002)


🔥 Recommended NGK Spark Plugs (2025)

PlugHeatGapNotesAmazon Link
PFR6A-1161.1mmOEM platinum; stock or mild boost (~300–400hp)Buy on Amazon
BCPR6EIX60.8mmIridium version; smoother burn, longer lifeBuy on Amazon
BCPR7EIX70.8mmOne step colder; 400–550hp setupsBuy on Amazon
BCPR8EIX80.7mmTwo steps colder; 550–700hp, aggressive boostBuy on eBay
R7436-880.7mmDouble fine wire iridium racing plugBuy on eBay
R7436-990.6mmTrack-focused 700+ hp buildsBuy on eBay
R7436-10100.6mmExtreme conditions, methanol or sustained high boost useBuy on eBay

NGK Heat Range: Lower = hotter; Higher = colder (e.g., 2 = very hot, 11 = very cold)


🔥 NGK IRI vs IX Series – What’s the Difference?

NGK’s IRI-series spark plugs—marketed in Japan as Iritop, Iriway, and Irimac—are technically identical to the IX-series plugs sold in the US and Europe. These plugs share the same materials, dimensions, and fine-wire iridium construction. The only differences are packaging and regional branding.

⚙️ IRI to IX Cross Reference Chart

IRI Series IX Part Number Notes
IRITOP7 BCPR7EIX JIS length – common RB26 plug
IRITOP8 BCPR8EIX JIS length – Japan only
IRITOP9 BCPR9EIX JIS length – very cold, Japan only
IRIWAY7 BKR7EIX ISO alternative – 2.5mm shorter
IRIWAY8 BKR8EIX ISO – US alternative to IRITOP8
IRIWAY9 BKR9EIX ISO – US coldest option
IRIMAC8 DCPR8EIX For select Nissan platforms
IRIMAC9 DCPR9EIX Alternate fitment – not RB26

📌 US Availability Tip

  • BCPR7EIX: Available in the US (IRITOP7 equivalent)
  • BCPR8EIX: Japan only – source as IRITOP8
  • BKR8EIX: ISO length fallback – not JIS; 2.5mm shorter

⚠️ Important: Using ISO (K-series) plugs in place of JIS (C-series) plugs may affect coil seating or combustion efficiency on RB26DETT engines. Always verify clearance and fitment when using substitutes.

🧾 NGK Plug Decoding (e.g., PFR6A-11)

  • P = Premium platinum
  • F = 14 mm thread, 19 mm reach, 16 mm hex
  • R = Resistor
  • 6 = Heat range
  • A = Firing end design
  • -11 = 1.1 mm factory gap (for OEM ignition)



🔥 2025 RB26 Spark Plug Chart (R32, R33, R34 GT-R)

This chart helps select the right NGK spark plug based on power level, fuel, and use case for your RB26DETT-powered Skyline GT-R.

Power Level Fuel Type Use Case Boost Level NGK Plug Model Heat Range Gap Notes
250–350 hp 91–93 Pump Street / Mild Tune 10–12 psi PFR6A-11 6 1.1mm OEM platinum, long life
300–450 hp 91–93 Pump Aggressive Street 12–15 psi BCPR6EIX / BCPR7EIX 6 / 7 0.8mm Iridium for sharper spark
400–550 hp E85 / 100+ Street/Track 15–22 psi BCPR7EIX 7 0.8mm Best for mixed use
500–650 hp E85 / 100+ Track / High Boost 20–28 psi BCPR8EIX 8 0.7mm Colder plug for detonation resistance
600–800 hp E85 / Race Track Only 25–30+ psi R7436-9 9 0.6mm Double fine wire, racing plug
700–900+ hp E85 / Race Drag / Circuit 30+ psi R7436-10 10 0.6mm Track use only, frequent inspection

Note: Always verify coil compatibility, dwell timing, and plug seating depth. RB26 requires JIS-length plugs (e.g., BCPR, not BKR).

📏 Coil Fitment Note (JIS vs ISO Length)

CodeReachTypeTotal LengthNotes
BC19 mmJIS~53.0 mmCorrect for R32/R33/R34 RB26DETT – coil seats properly
BK19 mmISO~50.5 mmMay not allow full coil engagement; can arc or misfire

⚠️ Always Use Resistor Plugs

  • Prevent RFI to ECU/MAF/CAS
  • Stabilizes spark signal
  • Prevents electrical interference

🔌 Ignition Coils by GT-R Model

ModelCoil TypeIgnitor RequiredNotes
R32Early externalYesExternal ignitor module on head
R33Early externalYesSame as R32
R34Late smart coilNoInternal ignitor (drop-in style)

🔍 What's Next ?

  • Verified replacement for NGK R7436 series (discontinued)
  • Dyno testing modern NGK Ruthenium plugs in RB26

How to read spark plugs, but not talk to them. 



Buy USA Legal R32, R33, and R34 Skylines at Toprank Importers!
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Nissan Skyline Parts and Toys

May 11, 2025

🏁 Nissan Challenge Round 4 – Trackside Support, Ernie’s R32, and Some Familiar Faces

Greg's R35, and Brian's R32 GT-R at Streets of Willow Springs
Greg's R35, and Brian's R32 GT-R at Streets of Willow Springs

Event: Nissan Challenge Round 4 – HTAC vs. Nissan Challenge
Location: Streets of Willow (Clockwise)
Date: May 2025

Round 4 brought out a great field of Nissans to Streets of Willow, with a friendly but fast-paced competition against HTAC and Nissan Challenge. The weather was surprisingly cooperative — cool and clear, a nice change from the typical Willow oven.

I was out supporting Ernie and Brian J. with their R32 GT-Rs, along with checking in on a few other friends like Greg Messinger in his R35. The Bulldog Racing guys, Ernie and Greg both Marines, with Shawn and his son doing support. 


🔧 Trackside Notes from the Pits

🏎️ Ernie’s Saurus R32 GT-R

We’re chasing an issue where the catch can is pushing oil — possibly a combination of blow-by and breather routing. We did try rerouting it. It popped an intercooler pipe a couple times. The OS88 can be hard to shift at times. Something that Ernie has been learning and working on.  We’ll keep refining the setup and may look at venting solutions or modifying crankcase evacuation. His best lap later in the day running with Greg was around a 1:22.


🏎️ Brian Jannusch’s R32 GT-R

We worked on dialing in tire pressures and added a little boost. The result was a more confident car through the mid-corners, but there's still a lot of time left on the table. The diff in the car is bad. Its really hard to give it any throttle on corner exit.  The trans is showing its age. Its occasionally hard to get into gear. 


🏎️ Greg Messinger’s R35 GT-R

Greg had a solid day. He found some loose bolts in his suspension, added some stiffer springs and picked up a ton of time vs the last few times he was out. 


📊 Class Results




Greg Messinger – R35 – 1:21.406

Class 1

  • 🥇 Charles Park – R35 – 1:20.820

  • 🥈 Greg Messinger – R35 – 1:21.406

  • 🥉 Michael DiGuilmi – G37 – 1:23.929


Brian Jannusch – R32 GT-R – 1:25.529
Class 2

  • 🥇 Luke Lederman – 1:21.900

  • 🥈 Brian Hap Hendricks – Z33 – 1:23.361

  • 🥉 Brian Jannusch – R32 GT-R – 1:25.529

Full results across all classes are available at nissanchallenge.com.


📸 Event Media

Yearly tradition

Alvin was out capturing pictures all day, Other than his nap. Big shoutout to SoCal Motorsports West and Brianna for capturing action shots all day long. d podiums online later.


Always bring your helmet

🧰 What’s Next

We’ll take some time over the summer to regroup. Brian’s R32 will get the differential, transmission, and a few other things it needs. Ernie’s oil issues will get more attention on the lift. And we’ll be back with more cars, more tuning, and more laps at  Buttonwillow The Classic- Round 5 - September 13.

See you at the next one — or find me trackside with tools in hand.

– Sean Morris



Buy USA Legal R32, R33, and R34 Skylines at Toprank Importers!
Index and Start Page
Nissan Skyline Parts and Toys
My track/out of the office stack of Ridgid Pro Gear both early and 2.0
Labeled so I don't have to remember what's in them. 


Talking to Ernie. Notice track attire. 



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