How Much Power Does a Veloster N Turbo Upgrade Add? Benchmarking 200–320 Hp Gains with the Garrett GTX 2867R

The Hyundai Veloster N has earned a loyal following for its sharp handling, playful character, and surprisingly potent 2.0‑liter turbocharged engine. Enthusiasts quickly discovered that the stock turbocharger—while capable—leaves meaningful headroom for more power. Upgrading the turbo is the single most effective modification to transform the Veloster N from a fun hot hatch into a genuine performance weapon. The Garrett GTX 2867R has become the go‑choice for owners who want a large jump in horsepower without sacrificing daily‑drivable manners.

This guide covers exactly what power gains you can expect with a GTX 2867R upgrade, from modest +50 hp setups all the way to full‑race configurations that add 200+ horsepower. We’ll break down the stock system, the turbo’s technology, required supporting modifications, real‑world dyno benchmarks, and the trade‑offs between power, spool, and reliability. By the end you’ll know whether the GTX 2867R is right for your build and what it truly takes to push your Veloster N into the 400‑plus horsepower club.

The Stock Turbo System: Capabilities and Bottlenecks

The Veloster N’s 2.0‑liter Theta II engine is equipped with a twin‑scroll turbocharger from the factory. In base N and N Performance models, the stock turbo flows enough air to produce 250 hp at the crank (approximately 230–240 whp on a Dynojet). The 2021‑and‑later N models received a revised engine control unit and slight boost tweaks, raising output to 275 hp in some markets, but the turbo hardware itself remained similar.

Stock Turbo Limitations

  • Compressor wheel size: The stock unit uses a roughly 46mm inducer compressor wheel. It maxes out airflow around 38–40 lb/min, capping usable power around 310–320 whp on aggressive fuelling.
  • Turbine housing: A small A/R (0.42 or so) helps spool quickly but creates a large exhaust backpressure at higher boost levels, causing premature torque fall‑off above 6000 rpm.
  • Compressor map efficiency: Above 22–23 psi the stock compressor exits its peak efficiency island, generating heat that forces the ECU to pull timing.

Most owners running only a tune and bolt‑ons (downpipe, intercooler, intake) land around 280–310 whp on 93 octane. Beyond that, the stock turbo becomes a brick wall.

Garrett GTX 2867R: Technology and Airflow

The Garrett GTX 2867R is a dual‑ball‑bearing, billet compressor wheel turbocharger designed for engines between 1.6 and 3.0 liters. It is widely used on the Veloster N, Hyundai i30 N, and Kia Forte GT thanks to its excellent balance of quick spool and high‑end airflow.

Key Specifications

  • Compressor wheel: 51.2mm inducer, 71.1mm exducer (GTX billet aerodynamics)
  • Turbine wheel: 53.9mm inducer, 46.9mm exducer (Inconel, dual‑scroll compatible)
  • Housing options: 0.64 A/R twin‑scroll (recommended for Veloster N)
  • Maximum airflow: ~53 lb/min (enough for over 450 whp on race fuel)
  • Boost range: 20–30 psi (32 psi absolute safe maximum on built engines)

The Garrett GTX 2867R’s GTX Gen II billet compressor wheel provides up to 20% more flow than a traditional cast wheel of the same size. Because the compressor maps shift to the right, the turbo maintains efficiency above 25 psi, meaning less inlet air heating at high boost. The dual‑ball‑bearing center section reduces shaft lag and lowers oiling requirements—ideal for a daily‑driven car that sees occasional track time.

For a closer look at the compressor map and sizing details, visit Garrett’s official GTX2867R product page.

Installation: What to Expect When Upgrading

Installing a GTX 2867R on a Veloster N requires patience and attention to detail. The turbo bolts directly to the factory exhaust manifold with the proper adapter plate (most kits include a new T25‑to‑T3 or direct twin‑scroll adapter). While the swap can be done in a driveway, professional installation is heavily recommended to avoid boost leaks, oil feed restrictions, and incorrect turbo clocking.

Required Parts

  • Garrett GTX 2867R turbocharger (chosen housing size)
  • Turbo adapter / manifold (if not using a full replacement manifold)
  • Oil feed and drain lines (AN fittings recommended)
  • New turbo gaskets and O‑rings
  • Upgraded wastegate actuator (14–18 psi spring)
  • Tial or HKS blow‑off valve (bypass style preferred for reliability)

Supporting Modifications to Unlock Full Potential

A turbo upgrade is only as good as the parts around it. To safely and consistently hit the power numbers discussed later, the following supporting modifications are mandatory for anything beyond a low‑boost “stage 1” setup.

Fuel System

  • High‑pressure fuel pump (HPFP): The factory HPFP runs out of flow above 350 whp on pump gas. Upgraded pumps from SXTH Element or LAP3 are needed.
  • Fuel injectors: Stock injectors are adequate to ~400 whp with E85. For race gas / methanol setups, consider Injector Dynamics ID1050x or Bosch 550‑cc units.
  • Low‑side fuel pump: For big fuel systems, a drop‑in pump such as the one from N75 Motorsport ensures enough pressure at high boost.

Charge Air and Exhaust

  • Intercooler: The factory intercooler heat‑soaks quickly. A stepped core unit (e.g., Forge or Wagner Tuning) reduces intake air temps by 20–30°F.
  • Downpipe / exhaust: A 3‑inch downpipe with high‑flow cat is essential. A full 3‑inch cat‑back further reduces backpressure.
  • Intake system: A larger cold‑air intake (CFM increase of at least 30%) prevents the stock airbox from becoming a bottleneck.

Engine Internals and Tuning

  • ECU tuning: Custom calibration via ECUTEK or Syvecs is required. Off‑the‑shelf flashes can work for low boost, but a dyno tune by a reputable Veloster N shop yields the safest and most repeatable results.
  • Head studs: Once you exceed 400 whp on pump gas or 360 whp on high boost, upgrading to ARP head studs is wise to prevent head lift.
  • Oil cooling: The factory oil cooler is marginal for track use; after about 400 whp, an external oil cooler with thermostat is recommended.

Power Benchmarks: From 250 to 450+ Horsepower

The following stages represent typical real‑world results from numerous Veloster N builds. Dyno numbers are given at the wheels (whp) on a Dynojet, which translates to roughly 10–12% less than crank hp. The “gain” is measured from a baseline of the owner’s car on stock turbo with a tune (approx. 270 whp).

Stage 1: Low Boost, Minimal Mods (320–340 whp)

  • GTX 2867R with 0.64 A/R housing
  • Stock intercooler and exhaust (or mild cat‑back)
  • Upgraded HPFP + tuned on 93 octane (23–24 psi)
  • Gained ~50–70 whp over stock turbo tune
  • Peak torque around 3400 rpm, tapering toward redline

This is an excellent “first step” setup. The car remains daily‑drivable, with spool only ~200–300 rpm later than stock. Power delivery is smooth, and no internal modifications are necessary.

Stage 2: Full Bolt‑Ons (370–400 whp)

  • GTX 2867R + 3‑inch downpipe, race cat, 3‑inch cat‑back
  • Upgraded front‑mount intercooler
  • Cold air intake + larger low‑side fuel pump
  • E30 or 93 octane with 26–27 psi peak boost
  • Gained ~100–130 whp over stock turbo tune

At this stage the Veloster N outruns many modern sports cars. The GTX 2867R is in its sweet spot; compressor efficiency remains above 72% throughout the powerband. Torque hits 340–360 lb‑ft at the wheels and stays flat past 6000 rpm. This is the most common configuration among serious enthusiasts. Many tuners recommend staying here for a reliable street car.

Stage 3: High Boost / Race Fuel (420–460 whp)

  • GTX 2867R with E85 ethanol blend or race gasoline (100+ octane)
  • ARP head studs installed
  • Bigger injectors (ID1050x or Bosch 550‑cc) + dual HPFP or surge tank
  • Boost raised to 28–30 psi (tapered near redline)
  • Upgraded oil cooler
  • Gained ~150–190 whp over stock turbo tune

This territory requires careful fueling and aggressive timing. The turbo is operating near its choke line, but still within safe limits on the 0.64 housing. The Veloster N’s engine, with proper preparation, handles the power surprisingly well. Quarter‑mile times typically drop into the 11‑second range with proper traction.

Stage 4: Fully Optimized (470–500 whp)

  • GTX 2867R on methanol injection (single or dual nozzle) + high octane fuel
  • Port injection added for even fuel distribution
  • Built short block (forged rods/pistons) highly recommended
  • Custom twin‑scroll manifold to maximize turbine flow
  • 30–32 psi peak boost
  • Gained ~200–230 whp over stock turbo tune

This is the ragged edge for the GTX 2867R. Compressor outlet temperature rises, and the turbine housing becomes the limiting factor. Only a handful of Veloster N owners go this far, but the results are spectacular: documented runs at over 500 whp on E85+meth. At these power levels, the car is best suited for roll racing or time attack; daily drivability compromises become noticeable.

For a detailed dyno database, visit the Veloster N forum thread dedicated to turbo upgrade results.

Driving Impressions: Spool and Torque Curve

One common concern with larger turbos is loss of low‑end response. The GTX 2867R on the 0.64 twin‑scroll housing mitigates this well. On stage 2, full boost arrives by 3400–3600 rpm, only about 300–400 rpm later than the stock turbo. The torque curve is much flatter and holds above 300 lb‑ft from 3500 to 6500 rpm, giving the car a strong “pulling” sensation throughout the mid‑range. At stage 3, boost comes in a bit later (3700 rpm) but the surge of power above 4000 rpm is addictive. The car feels genuinely quick, not just peaky.

On the highway, the GTX 2867R excels. Passing power from 60 to 100 mph is effortless, and the turbo does not run out of breath at the top of third gear like the stock unit does. Many owners report that the upgraded turbo transforms the Veloster N’s character from a zippy hot hatch to a serious sports sedan competitor.

Reliability and Longevity Considerations

Power comes with responsibility. The Veloster N’s block and rods are strong—they can handle around 380–400 whp reliably on pump gas. Beyond that, ring land failures and rod bearing wear become possible if detonation occurs. A stage 2 build is generally considered safe with proper tuning and 93 octane. For stage 3 and above, budget for forged internals if you plan to run high boost frequently.

The GTX 2867R itself has proven robust. The dual‑ball‑bearing cartridge should last 60,000–80,000 miles under normal street use. However, oil quality and cool‑down habits matter greatly. Use a high‑quality synthetic 5W‑30 and always allow the turbo to cool before shutting off after a hard drive. An aftermarket turbo timer or simply idling for 30 seconds after spirited driving will extend seal life.

Cost Analysis: What Invested for What Gain

Building a turbo Veloster N is not cheap. Below is an approximate cost breakdown for each stage. Prices vary by brand and region; these are US‑market estimates.

  • Stage 1: $2,200–$2,800 (turbo kit $1,600–$2,000, tune $600–$800, HPFP $400–$600)
  • Stage 2: $4,500–$6,000 (adds intercooler $600–$900, downpipe $400–$600, exhaust $800–$1,200, fuel pump $300–$500)
  • Stage 3: $7,500–$10,000 (adds injectors $600–$900, head studs $300, E85 tune $200–$400, labor $1,500–$2,500)
  • Stage 4: $12,000–$18,000 (includes methanol kit $600–$1,200, engine build $3,000–$5,000, port injection $1,500–$2,500)

While the initial investment for the turbo itself is around $1,600, the supporting modifications quickly add up. That said, compared to rival cars (Focus RS, Golf R, Civic Type R), the Veloster N offers one of the most accessible paths to 350–400 whp. The engine platform is robust and the aftermarket is mature.

Alternatives to the GTX 2867R

The GTX 2867R is not the only option. Some enthusiasts choose smaller turbos like the GTX 2860R for faster spool (full boost by 3000 rpm) at the cost of top‑end airflow (max ~380 whp). Others opt for larger units like the GTX 3071R or Pure Turbos drop‑in upgrades that retain the stock housing. The GTX 2867R strikes the best balance for most street‑oriented builds, but if your goal is strictly drag racing, a larger turbo may better suit you.

Final Verdict

The Garrett GTX 2867R turbocharger can elevate the Veloster N’s power output from its stock 250‑275 horsepower to well over 400 horsepower at the wheels. Depending on your target and budget, you can achieve gains that range from 50 hp (conservative daily) to an impressive 200+ hp (race‑fuel setup). The upgrade transforms the car without destroying its character: spool is only slightly delayed, torque is massive and sustained, and reliability remains excellent when supporting modifications are addressed.

For the owner who wants a genuine step up—not just a mild refresh—the GTX 2867R kit is the sweet spot. Pair it with proper tuning, fueling, and cooling, and your Veloster N will become a true enthusiast’s machine capable of embarrassing far more expensive machinery.