- 12/03/2025
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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.
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