31 أكتوبر 2026
Omar Refai

Ammar's 1,948 WHP Nissan GT-R R35 SZM2200: Billet VR38 and 314 km/h

Ammar's 1,948 WHP Nissan GT-R R35 SZM2200: Billet VR38 and 314 km/h

Billet VR38. 1,948 WHP on the hub dyno. 306 km/h at Yas, then 314 km/h in Kuwait.

Quick answer: Ammar's Nissan GT-R R35, built by Subzero Motorsport in Dubai, makes 1,948 WHP and 1,432 lb-ft of torque on a hub dyno, running E99 fuel at 3.9 bar of boost. It runs the SZM2200 package with a Stage 4 billet 4.1L VR38DETT, twin Precision Next Gen 6875 turbos and a Stage 5 GR6 transmission, on the factory ECU with EcuTek. It first made 1,864.4 WHP and ran 306 km/h over 400 m at Yas Marina Circuit. After an ETS water-to-air intercooler, an SZM mechanical fuel system and a JAZ fuel cell, it made 1,948 WHP and ran 314 km/h over 400 m in Kuwait.

Most big-power GT-R builds are shown at one moment in time: one dyno sheet, one run. This one is different. Ammar's car was built, dyno tested, raced, upgraded and raced again, so we can show exactly what changed and what it was worth. On our SZM2200 package with a billet engine block, it first made 1,864.4 WHP and ran 306 km/h at Yas Marina Circuit. With better charge-air cooling and fuel delivery, it made 1,948 WHP and ran 314 km/h in Kuwait.

The engine, cylinder heads, turbos, intake manifold and transmission stayed the same between the two results. The gain came from cooling, fuel and calibration. The current setup has the potential for around 2,100 WHP, depending on boost, fuel and conditions.

Ammar's 1,948 WHP Nissan GT-R R35 SZM2200 with Top Secret-style carbon fibre bonnet, built by Subzero Motorsport Dubai

Key Specifications

The Story Behind the Build

Ammar wanted a GT-R built for roll racing at the highest level, without leaving the factory ECU or the SZM2200 platform. The plan was never a one-off dyno number. It was a car that could be tested, raced, improved and raced again, with every step measured.

That gives this build something most power figures don't have: a clear before and after. The car ran its first event in its original configuration, came back to the workshop for cooling and fuel upgrades, and then went racing again with the changes measured on the same hub dyno.

Project Objectives

  • Build on the SZM2200 package with a Stage 4 billet 4.1L short block for extra strength margin
  • Keep the factory ECU, calibrated with EcuTek by Mohammad Al Jabri
  • Prove the results on the hub dyno and in 400 m roll racing, not just on paper
  • Develop the car in stages, measuring the gain from each upgrade
  • Equip it with the safety systems needed for runs above 300 km/h
  • Keep the recognisable R35 look, with no dedicated weight-reduction programme

How Much Power Does It Make?

In its updated configuration, Ammar's GT-R makes 1,948 WHP and 1,432 lb-ft of torque on a hub dyno. In its original configuration, it made 1,864.4 WHP and 1,322.2 lb-ft. The current setup has the potential for around 2,100 WHP, depending on boost, fuel and operating conditions.

A hub dyno bolts directly to the wheel hubs, so there's no tyre slip on rollers. That makes it more consistent from run to run, which is exactly what you need when you're measuring the effect of an upgrade.

Original configuration: 1,864.4 WHP and 1,322.2 lb-ft

Before the cooling and fuel upgrades, the car ran:

  • SZM Stage 4 billet VR38 short block, 4.1L
  • SZM Stage 3 cylinder heads
  • Twin Precision Next Gen 6875 turbos
  • AMS dual-injector intake manifold
  • Boost Logic Race Intercooler
  • SZM intercooler piping with Vibrant HD clamps
  • T1 brushless fuel system with SZM billet fuel hanger
  • SZM Stage 5 GR6 transmission

Hub dyno result of 1,864.4 WHP and 1,322.2 lb-ft for Ammar's SZM2200 Nissan GT-R R35 in its original configuration

Ammar's SZM2200 Nissan GT-R R35 making 1,864.4 WHP and 1,322.2 lb-ft on the hub dyno, before the ETS intercooler and mechanical fuel system upgrades.

Yas Marina Circuit: 306 km/h Over 400 m

In its original 1,864.4 WHP configuration, the car went to Yas Marina Circuit in Abu Dhabi for a 400 m roll race and recorded 306 km/h (about 190 mph).

At this level, peak power isn't the whole story. Keeping intake air temperatures down, holding fuel pressure steady and controlling boost all the way through a run matter just as much. Yas showed us where the next gains would come from.

Ammar's SZM2200 Nissan GT-R R35 recording 306 km/h over 400 metres at Yas Marina Circuit, Abu Dhabi

306 km/h over 400 m at Yas Marina Circuit, Abu Dhabi, in the original 1,864.4 WHP configuration.

The Upgrades: Cooling and Fuel

From Boost Logic Race Intercooler to ETS water-to-air

Twin Precision Next Gen 6875 turbos heat the intake air a lot as they compress it, and hotter air means less power and less safety margin. The original Boost Logic Race Intercooler is an air-to-air design. For Kuwait, it was replaced with an ETS Pro Series water-to-air intercooler, which transfers heat from the charge air into a separate liquid cooling circuit.

The SZM intercooler piping already had Vibrant HD clamps before Yas, so the piping stays connected under high boost.

ETS water-to-air intercooler installed on Ammar's 1,948 WHP SZM2200 Nissan GT-R R35

ETS water-to-air intercooler installed as part of the updated 1,948 WHP configuration.

SZM mechanical fuel system and JAZ fuel cell

To support more than 2,000 WHP on E99, the car moved from the T1 brushless fuel system to our SZM Complete Mechanical Fuel System Kit, built around a Waterman Racing Lil Bertha mechanical pump. A mechanical pump is driven by the engine, so its delivery rises with engine speed instead of being limited by the electrical system. That matters on ethanol, which needs far more fuel flow than petrol for the same power, and gives the headroom needed at 3.9 bar of boost.

Mechanical fuel pump system installed on Ammar's SZM2200 Nissan GT-R R35 VR38DETT

The factory fuel tank was removed completely and replaced with a JAZ fuel cell. Its baffled design keeps fuel at the pickup under hard acceleration, and the system is set up to keep fuel temperatures lower during high-performance use. Together, these give the fuel headroom for the car's 2,100 WHP potential.

JAZ fuel cell replacing the factory fuel tank in Ammar's SZM2200 Nissan GT-R R35

JAZ fuel cell installed as the main fuel tank, replacing the factory OEM tank completely.

Updated Hub Dyno Results: 1,948 WHP and 1,432 lb-ft

With the ETS intercooler, mechanical fuel system and JAZ fuel cell installed, the car went back on the hub dyno for testing and calibration. On E99 at 3.9 bar of boost, it made 1,948 WHP and 1,432 lb-ft, a gain of 83.6 WHP (4.5%) and 109.8 lb-ft (8.3%).

The engine, cylinder heads, turbos, intake manifold and Stage 5 GR6 transmission were unchanged. The gain came from cooler charge air, more fuel headroom and the calibration that goes with them.

Original vs updated hub dyno results

Measurement Original Updated Change
Wheel horsepower 1,864.4 WHP 1,948 WHP +83.6 WHP (+4.5%)
Wheel torque 1,322.2 lb-ft 1,432 lb-ft +109.8 lb-ft (+8.3%)
Intercooler Boost Logic Race (air-to-air) ETS Pro Series (water-to-air) Upgraded
Fuel pump T1 brushless SZM mechanical (Lil Bertha) Upgraded
Fuel tank OEM JAZ fuel cell Replaced
Intake manifold AMS dual-injector AMS dual-injector Unchanged
Turbos Twin Precision NG 6875 Twin Precision NG 6875 Unchanged
Engine SZM Stage 4 billet VR38 SZM Stage 4 billet VR38 Unchanged

Hub dyno result of 1,948 WHP and 1,432 lb-ft for Ammar's billet VR38 Nissan GT-R R35 at Subzero Motorsport Dubai

Ammar's billet VR38 GT-R on the hub dyno at Subzero Motorsport in Dubai after its fuel and intercooler upgrades.

Kuwait: 314 km/h Over 400 m

With the updated setup, the car went to Kuwait and recorded 314 km/h (about 195 mph) over 400 m. That's 8 km/h faster than its Yas Marina result.

Trap speed also depends on calibration, boost, weather and the track itself, so the comparison isn't a laboratory test. But with the engine, turbos and transmission unchanged, the result shows the cooling and fuel upgrades working on the road as well as on the dyno.

Ammar's SZM2200 Nissan GT-R R35 recording 314 km/h over 400 metres in Kuwait

314 km/h over 400 m in Kuwait with the updated 1,948 WHP configuration.

Yas Marina vs Kuwait

Specification Yas Marina, UAE Kuwait
Distance 400 m roll race 400 m roll race
Trap speed 306 km/h (190 mph) 314 km/h (195 mph)
Hub dyno power 1,864.4 WHP 1,948 WHP
Hub dyno torque 1,322.2 lb-ft 1,432 lb-ft
Intercooler Boost Logic Race ETS water-to-air
Fuel pump T1 brushless SZM mechanical (Lil Bertha)
Fuel tank OEM JAZ fuel cell
Engine, turbos, transmission Unchanged Unchanged

The SZM2200 Package

The SZM2200 Nissan GT-R R35 2,200 HP Performance Package is the top of our street-legal, daily-drivable VR38DETT range. Ammar's car takes it further for competition, with a billet short block, water-to-air cooling, a mechanical fuel system, a fuel cell and a parachute.

Stage 4 billet short block (4.1L)

The standard SZM2200 uses a prepared OEM block. Ammar's car was upgraded to our VR38 Stage 4 Billet Short Block Package on the SZM Spec VR38 Billet Block (Wet), built in the 4.1L stroker configuration. For a full comparison, read Billet VR38 Block vs OEM VR38 Block.

The Stage 4 billet short block is rated at up to 3,000 HP when built with 4.3L pistons and aluminium connecting rods, with the right supporting parts and calibration. Ammar's engine uses the 4.1L configuration with ItalianRP Platinum steel rods instead of the optional aluminium rods, putting strength and durability first under extreme boost.

SZM Stage 4 billet VR38DETT 4.1L engine for Ammar's Nissan GT-R R35 at Subzero Motorsport Dubai

Stage 3 cylinder heads with GSC Power-Division valvetrain

All CNC porting, combustion chamber machining, valve seat work and engine assembly are done in-house at Subzero Motorsport in Dubai.

SZM Stage 3 CNC-ported VR38DETT cylinder heads with GSC Power-Division valvetrain

Twin turbo system

The turbo rating describes what each turbo can flow, not the measured output of the engine. Actual power depends on boost, fuel delivery, charge-air temperature, exhaust flow and calibration, which is exactly why the cooling and fuel upgrades made a difference on this car.

AMS dual-injector intake manifold

The AMS dual-injector intake manifold uses two sets of injectors. The primary injectors handle low-load driving and the secondary injectors add fuel as demand rises, giving the injector capacity this power level needs. It was unchanged between the two configurations, and it's available to order through Subzero Motorsport. Read why we run dual injectors on the GT-R.

AMS dual-injector intake manifold on Ammar's billet VR38DETT Nissan GT-R R35

ECU and Calibration

Ammar's GT-R keeps the factory (OEM) Nissan ECU, calibrated with EcuTek by Mohammad Al Jabri (MRJ), without a standalone engine management system. The calibration manages the billet VR38, the twin Precision 6875 turbos and the mechanical fuel system, and was refined again on the hub dyno after the upgrades.

The car runs on E99 at 3.9 bar (about 57 psi) of boost. Near-pure ethanol has a very high resistance to knock and a strong cooling effect, which makes it ideal for this level of boost, but it needs much more fuel flow than petrol. That's why the mechanical fuel system was part of the upgrade. Read 98 RON vs E85: how much power can you make on each fuel?

At 1,948 WHP, with around 2,100 WHP potential, this car shows what the factory GT-R ECU can do when it's calibrated properly for extreme power.

GR6 Transmission and AWD System

This car runs our Stage 5 Transmission Build, rated at up to 1,600 lb-ft of torque and around 2,400 HP. That leaves headroom above the engine's 1,432 lb-ft. See how much HP the GR6 can handle.

Billet case and housings

Albins gears and shafts

Clutches and differential

Every transmission is fully stripped, inspected and blueprinted in-house, with clutch clearances set, the oil pump serviced, the valve body calibrated and the differentials assembled. The billet case and plates stop the gearbox flexing under load, the Albins gears and shafts replace the factory weak points, and the Dodson clutches hold the torque on hard launches from a roll.

SZM Stage 5 GR6 transmission with billet ETS case for Ammar's 1,948 WHP Nissan GT-R R35

JRZ RS-PRO Dampers and SPL Suspension

Putting 1,948 WHP down from a roll needs the chassis set up for traction and stability. The car runs JRZ RS-PRO dampers with an SPL complete suspension kit.

The JRZ RS-PRO is a 3-way adjustable damper, with separate control of rebound, high-speed compression and low-speed compression. The SPL components replace the factory rubber bushings and fixed links with adjustable parts, so camber, caster and toe can be set precisely and held under load. Together, they let us tune weight transfer, traction and high-speed stability.

JRZ RS-PRO dampers and SPL suspension components on Ammar's SZM2200 Nissan GT-R R35

Brakes and RAYS 18-Inch Wheels

The car runs carbon-ceramic front brakes, a GT1R lightweight rear brake conversion and RAYS 18" wheels. Carbon-ceramic discs handle the heat of stopping from 300+ km/h and reduce unsprung and rotating mass compared with iron discs. The GT1R rear conversion is a complete kit with its own rear knuckles, smaller calipers and rotors, which cuts rotating and unsprung mass at the rear and lets the car run 15" rear drag wheels when needed, and the 18" wheels open up a much wider choice of drag and roll-race tyres than the factory 20" size. For a complete carbon-ceramic setup, see our carbon-ceramic brake kit (front and rear discs with pads).

Carbon-ceramic front brakes and RAYS 18-inch wheels on Ammar's SZM2200 Nissan GT-R R35

Carbon-ceramic front brakes and RAYS 18" wheels.

Top Secret-Style Bonnet and No Dedicated Weight Reduction

The car keeps the recognisable R35 shape, with a Top Secret-style carbon fibre bonnet for a more aggressive look. It hasn't had a dedicated weight-reduction programme. The development focused on engine output, fuel delivery, charge-air cooling, drivetrain strength, chassis control and safety. Some parts, like the carbon bonnet, carbon-ceramic brakes and carbon seat, do save weight, but the build wasn't designed around stripping the car.

That makes the 314 km/h result more impressive: it was achieved with a fully equipped car, roll cage, fuel cell and parachute included. For hidden weight savings on your own GT-R, see our weight reduction parts.

Safety: SZM Roll Cage and Parachute

At trap speeds above 300 km/h, protecting the driver and stopping the car safely matter as much as making power.

SZM parachute kit mounted on Ammar's 314 km/h Nissan GT-R R35

Boost Logic carbon fibre seat and OMP racing harness

The factory driver's seat has been replaced with a Boost Logic carbon fibre seat and an OMP racing harness. Together with the roll cage, they hold the driver firmly in place under hard acceleration, braking and high-speed runs.

Boost Logic carbon fibre seat, OMP racing harness and SZM roll cage in Ammar's Nissan GT-R R35

Exhaust: Valved Y-Pipe with Factory Cat-Back

The car keeps the factory cat-back exhaust with a valved Y-pipe. With the valves closed, the exhaust runs through the factory system and stays quieter on the road. With the valves open under load, the turbos get a free-flowing exhaust path for full power.

Valved Y-pipe exhaust with factory cat-back on Ammar's SZM2200 Nissan GT-R R35

Final Result

  • 1,948 WHP and 1,432 lb-ft on the hub dyno, up from 1,864.4 WHP and 1,322.2 lb-ft
  • 314 km/h over 400 m in Kuwait, up from 306 km/h at Yas Marina Circuit
  • Around 2,100 WHP potential with the current setup
  • SZM2200 package with a Stage 4 billet 4.1L VR38 and twin Precision Next Gen 6875 turbos
  • E99 at 3.9 bar, on the factory ECU with EcuTek, tuned by Mohammad Al Jabri
  • Stage 5 GR6 transmission rated at 1,600 lb-ft
  • ETS water-to-air intercooler, SZM mechanical fuel system and JAZ fuel cell
  • SZM roll cage and parachute, with no dedicated weight-reduction programme

The lesson from this build is simple: at close to 2,000 WHP, the parts around the engine decide what it can really do. Same engine, same turbos, same transmission, and better cooling and fuel delivery were worth 83.6 WHP and 8 km/h. For other SZM2200 builds, see Zaid's 1,833 WHP street build and Al-Lawati's 2023 GT-R Nismo.

Frequently Asked Questions

How much horsepower does Ammar's Nissan GT-R make?

It makes 1,948 WHP and 1,432 lb-ft of torque on a hub dyno in its updated configuration. The original setup made 1,864.4 WHP and 1,322.2 lb-ft. The current setup has the potential for around 2,100 WHP.

How fast is Ammar's GT-R over 400 m?

It recorded 314 km/h (about 195 mph) over 400 m in Kuwait with its updated setup, and 306 km/h (about 190 mph) at Yas Marina Circuit in Abu Dhabi with its original setup.

What upgrades were made between Yas Marina and Kuwait?

The Boost Logic Race Intercooler was replaced with an ETS water-to-air intercooler, the T1 brushless fuel system was upgraded to an SZM mechanical fuel system, and the factory fuel tank was replaced with a JAZ fuel cell. The engine, heads, turbos, intake manifold and transmission were unchanged.

How much power did the intercooler and fuel upgrades add?

83.6 WHP (4.5%) and 109.8 lb-ft of torque (8.3%), from 1,864.4 WHP to 1,948 WHP, measured on the same hub dyno. The trap speed rose by 8 km/h, from 306 km/h to 314 km/h.

What engine and turbos does the car use?

An SZM Stage 4 billet VR38DETT 4.1L short block with SZM Stage 3 cylinder heads, an AMS dual-injector intake manifold and twin Precision Next Gen 6875 turbos.

What is the SZM2200 package?

The SZM2200 is Subzero Motorsport's top street-legal, daily-drivable Nissan GT-R R35 performance package, rated at 2,200 HP. Ammar's car builds on it with a billet short block and competition cooling, fuel and safety upgrades.

Why use a billet block instead of the OEM block?

The SZM Spec VR38 Billet Block (Wet) is machined from solid billet aluminium. It's more rigid than the cast OEM block under high cylinder pressure, giving more margin for repeated high-boost runs at close to 2,000 WHP.

What fuel and boost does it run?

It runs on E99 at 3.9 bar (about 57 psi) of boost.

Why switch to a mechanical fuel pump?

A mechanical pump is engine-driven, so its delivery rises with engine speed instead of being limited by the electrical system. On E99, which needs much more fuel flow than petrol, that gives the headroom needed for power levels beyond 2,000 WHP.

What is the difference between an air-to-air and a water-to-air intercooler?

An air-to-air intercooler cools the charge air with airflow through the core. A water-to-air intercooler transfers the heat into a separate liquid cooling circuit, which helps keep intake air temperatures under control at extreme boost.

Does the car still use the factory ECU?

Yes. It uses the factory (OEM) Nissan ECU with EcuTek, tuned by Mohammad Al Jabri (MRJ), with no standalone engine management.

What transmission does it use?

An SZM Stage 5 GR6 transmission rated at up to 1,600 lb-ft and around 2,400 HP, with a Dodson ProMax 12/12 clutch, an Albins gearset and shafts, an SZM billet ETS case and a Wavetrac rear differential.

What suspension does it use?

JRZ RS-PRO 3-way adjustable dampers with an SPL complete suspension kit.

Has the car had weight reduction?

No dedicated weight-reduction programme. It does have a Top Secret-style carbon fibre bonnet, carbon-ceramic front brakes, a lightweight rear brake conversion and a carbon fibre seat.

What safety equipment does it have?

An SZM 6-point roll cage, an SZM parachute kit, a Boost Logic carbon fibre seat and an OMP racing harness.

What is a hub dyno?

A hub dyno bolts directly to the wheel hubs instead of using rollers under the tyres, so there's no tyre slip. That makes results more consistent, which is ideal for measuring the effect of an upgrade.

Where was the car built?

It was built by Subzero Motorsport in Al Quoz, Dubai, UAE, a Nissan GT-R R35 specialist since 2005, and tuned in-house by Mohammad Al Jabri.

Explore the Components

Build Your Nissan GT-R with Subzero Motorsport

Whether you want a clean 750 HP road car or a 2,000 WHP roll racer like this one, we build every package around your car, your fuel and how you plan to use it. Engine building, in-house machining, turbo systems, transmission builds, calibration and testing on our hub dyno are all done under one roof in Dubai.

Contact us with your power goal and we'll put together a package for your GT-R.

تم التحديث November 11, 2026