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MX-5 NB Turbo: Bang-for-the-Buck Track Tool

In this configuration, the MX-5 NB is currently the best bang-for-the-buck track tool available. Targeted improvements in key areas transform the 1.8L turbocharged roadster (on a stock block) into a pure driving machine delivering 240 hp and 260 Nm of torque.

Performance Specs & Highlights

  • Engine Power: 240 hp
  • Torque: 260 Nm
  • Top Speed: 245 km/h
  • Max RPM: 7,250 rpm
  • Boost Pressure: Up to 0.7 bar
  • Use Case: Time Attack, Track Days, Street

Optimized for maximum driving fun, durability, and performance per euro. The setup has been in place since 2022, with the turbo upgraded from a GBC 20-300 to a G25-550.

Drivetrain Components

  • Tuned for durability under frequent track use
  • Peak power at 7,000 rpm, peak torque at 6,000 rpm
  • Drives almost like a naturally aspirated engine

Components:

  • Xtreme Clutch Stage-1
  • 5-speed gearbox (no cooling)
  • Stock differential (no cooling)

Suspension & Aero

  • Suspension adjusted per track
  • Rear wing usually in mid-position
  • Camber: 4.2° front / 3.5° rear

Setup:

  • SPS Motorsport Track Coilovers with Energy Suspension bushings
  • Bauer ball joints for cost-effective camber gain
  • StopTech 280 mm brakes (brake cooling recommended for heavy track use)
  • SPS Motorsport CFD-designed rear wing (adds stability, slight understeer offset by front camber)
  • Hardrace sway bars for improved cornering stability

Interior & Safety

  • Mostly stock interior retained (sound system, insulation, carpets)
  • Trunk emptied for coilover access

Safety Gear:

  • Clubsport roll bar for added protection and rigidity
  • Sparco Sprint bucket seat (budget-friendly)

Summary

This MX-5 NB offers a well-balanced package for track days and time attack. With smart performance upgrades, a finely tuned chassis, and a reliable drivetrain, it delivers driving pleasure, performance, and affordability. Despite the turbo, the car behaves almost like a naturally aspirated engine. High-quality components like the SPS coilovers, StopTech brakes, and CFD wing make it adaptable to various track demands. Retaining interior usability further enhances its appeal as a daily-capable track tool.


Turbo Comparison – 2024 Season

Turbo Setup

Power/Torque

Track

Temp (°C)

Lap Time

Optimal Time

GBC 20-300:

195 hp / 240 Nm

Oschersleben

17–20

1:44.90

1:43.24

G25-550:

240 hp / 260 Nm

Oschersleben

18–22

1:41.75

1:40.68

GBC 20-300:

195 hp / 240 Nm

Chenevières

24

1:53.78

1:53.17

G25-550:

240 hp / 260 Nm

Chenevières

22–26

1:51.05

1:50.58

GBC 20-300:

195 hp / 240 Nm

Nordschleife

20–24

8:08.39

8:01.39

G25-550:

240 hp / 260 Nm

Nordschleife

22–26

7:49.74

7:46.02

Result: The G25-550 turbo shows a clear improvement, especially on tracks with long straights and flowing corners. Average lap time gain is ~3%.


Comparison with Modern Sports Cars


Hockenheimring

Car

Power/Weight (bhp/t)

Tires

Lap Time

MX-5 NB Turbo:

174 bhp/t

Yokohama A052 205/50 R15

2:03.1

Toyota Supra GR 2.0:

173 bhp/t

Michelin Pilot Super Sport

2:03.8

BMW M135i xDrive:

194 bhp/t

Michelin Pilot Super Sport

2:06.0

Insight: The MX-5 beats both the Supra and M135i thanks to its light weight and agility.


Anneau du Rhin

Car

Power/Weight (bhp/t)

Tires

Lap Time

MX-5 NB Turbo:

215 bhp/t

Yokohama A052 205/50 R15

1:26.56

VW Golf GTI Clubsport:

220 bhp/t

?

1:26.40

Toyota GR86:

190 bhp/t

?

1:27.30

Insight: The MX-5 is just 0.16s behind the GTI Clubsport and 0.74s ahead of the GR86.


Nürburgring GP & Nordschleife

Car

Power/Weight (bhp/t)

Lap Time GP

Lap Time BTG

MX-5 NB Turbo:

215 bhp/t

2:20.70

7:49.74

Lotus Elise Sport 220:

237 bhp/t

2:20.80

7:52.10

Insight: Despite being heavier (~1100 kg vs. ~900 kg), the MX-5 matches and even beats the Elise.


Final Verdict

The MX-5 NB Turbo proves highly competitive against newer, more powerful cars—especially on tracks that reward agility and cornering speed. It’s a true driver’s car, offering exceptional value and performance.

MX-5 Fahrwerk Turbo Tracktool
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