Open Monday - Friday 8am to 6pm MST Order Online 24/7
0 Items | $0.00 | Checkout | My Account
Vivid Racing Home Page
    SEARCH BY:  Wheel Size,    Tire Size,    Popular
CLEARANCE DEALSAir IntakesBig Brake KitsBrake PartsBody | Aero KitsECU TuningElectronicsEngine InternalsEngine UpgradesExhaust PartsExteriorFuel ComponentsGaugesInteriorPower PackagesPulleysRacing GearRadiator PartsRoll Bars | CagesSuspensionTransmissionTurbo | SuperchargerWheelsTiresUniversal & RepairVivid Racing GearVivid Motosports

Browse by Brand

Popular Vehicles

Audi R8 Parts BMW M4 M3 Parts Corvette C7 Parts Mercedes AMG Parts Mitsubishi EVO Parts Nissan GTR Parts Porsche 997 Turbo Parts Porsche 991 C2 C4 Parts Subaru WRX STI Parts
Click to Ask a Pro!
Ask a Pro with our
Vivid Racing Support System
Put Wheels on Your Car!
The VR Wheel App
Test Fit Wheels on Your Car

Help & Information

Contact Us Company Profile Wholesale Sales Service & Tuning Price Matching Our Guarantees International Orders Extended Warranty Military Discounts Customer Gallery Installation Articles Product Reviews Shipping & Returns Terms & Conditions Employment

Why Buy at VR

Unitronic Stage 3 Big Turbo 630CC ECU Tuning Software Volkswagen Jetta MK4 1.8T 02-05

  • Unitronic Stage 3 Big Turbo 630CC ECU Tuning Software Volkswagen Jetta MK4 1.8T 02-05
  • Unitronic Stage 3 Big Turbo 630CC ECU Tuning Software Volkswagen Jetta MK4 1.8T 02-05
  Product Information
  Model: S3BT630JTA18T205
  Learn More
1.480.966.3040    Click for Live Support
Add to Wishlist
Product Information

Unitronic brings you the smoothest and most reliable power gains available for your vehicle. All software is precisely tuned for diverse driving conditions to give you the most control possible. All software upgrades are designed to offer your car the highest level of performance and reliability. By offering a non-transferable lifetime limited warranty on our performance flashes, they are setting the standard for the ECU tuning industry.

Today, dynamometer tests provide us with extremely precise results. The dyno tests at Unitronic show you the most accurate results when measuring power and torque for everyday driving conditions. Since you don’t drive all day with your foot to the metal, it is equally important for your engine to be well configured for running smoothly, as it is for accelerating briskly.



DESCRIPTION: Big Turbo Software Precisely Engineered to Run 20psi of Boost on a Stock Engine. (For over 300WTQ you need upgraded rods).

GAS TYPE OPTIONS: 91 Octane - 93 Octane

INSTALLATION: Ecu needs to be sent to the Head Office. The turnaround time is approximately 1-2 weeks from the receiving date. In some rare cases we may require a little more time. In any event we will keep you informed once we receive your ECU.

TURBO OPTIONS: GT28-GT30 Series Turbo or Similar Size


  • Siemens 630cc Injectors
  • OBD2 VR6 or TT225 Maf Housing (Keep Stock Sensor)
  • 3 Bar FPR
  • Upgraded Exhaust System
  • Upgraded Intercooler
  • Cold Air Intake / Short Ram


  • Upgraded Fuel Pump (For over 300HP)
  • Upgraded (DV) Diverter Valve
  • Upgraded Rods (For over 300WTQ)

CAM FILE OPTIONS: Stock - Catcams 3658 - Catcams 3651 or Similar Specs





  • Engineered with Strict Industry Standards
  • Extensively Tested Under Various Driving Conditions
  • Optimized Responsiveness and Drivability
  • Power Delivery Perfectly Optimized Throughout the Power Band
  • Speed Governor Removed
  • RPM Limiter Increased to 7500 (With Stock Head)
  • Optimized for an Upgraded (DV) Diverter Valve or (BOV) Blow Off Valve
  • Ignition Timing Precisely Calibrated for Higher Octane Fuel 

All Unitronic performance software upgrades come with an unconditional 30-day money back guarantee, to ensure that your power and performance expectations. If for any reason you are not 100% satisfied with your Unitronic software, you may return it for a full refund (installation fees may not be covered). This warranty does not cover any ECU parts, any mechanical issues or defective components not related to software installation. Unitronic reserves the right to refuse any warranty claim if problems arise from improper installation, misuse, or abuse of the chip. Unitronic reserves the right to inspect the ECU for evidence of tampering or misuse. If such is the case, Unitronic may decline the claim. If a manufacturer ECU update overwrites the Unitronic software, Unitronic and its dealers will happily reinstall it for you. In such a case, installation charges may apply and may vary between dealers. ECU must be present at the Tuning Facility, if you are not local, you can mail in your ECU. Most of the software is applied via the OBD-II port, however it still must be at our Tuning Facility.

Select Available Options Then Click
Vivid Racing Reviews:
"They have a great selection at comparable prices and a lot of shipping options."
TEXT_OF_5_STARS by Miles
"Great site and great customer service! I love the way they help you out if they are out of stock with something and I love that they have a huge variety or car parts"
TEXT_OF_5_STARS by Jason Brooks
"Ahmed has been very helpful through the process."
"Products are always fairly easy to find. prices are well priced and not over priced. shipping may be a little expensive on some parts but you can't win them all. all in all good company when looking for quality parts."
"Great to find a store where i can buy quality items for my car."

View one of these Hot Items!
K&N 57 Series FIPK Performance Intake Kit Ford Mustang Cobra 4.6L V8 96-01
K&N 57 Series FIPK Performance Intake Kit Ford Mustang Cobra 4.6L V8 96-01
AEM Cold Air Intake System Toyota Celica GTS 00-03
AEM Cold Air Intake System Toyota Celica GTS 00-03
Injen Short Ram Air Intake Polished Nissan 350Z 07-08
Injen Short Ram Air Intake Polished Nissan 350Z 07-08
Megan Racing Downpipe Honda Fit 06-11
Megan Racing Downpipe Honda Fit 06-11
Skunk2 Pro Series 68mm Billet Throttle Body Honda Civic Non-Si 01-05
Skunk2 Pro Series 68mm Billet Throttle Body Honda Civic Non-Si 01-05
Kooks Catalytic Converters Dodge Magnum 5.7L Hemi 05-10
Kooks Catalytic Converters Dodge Magnum 5.7L Hemi 05-10
Magnaflow Dual Competition Series Cat-Back Dodge Challenger SRT-8 08-11
Magnaflow Dual Competition Series Cat-Back Dodge Challenger SRT-8 08-11
Borla Cat Back System Aggressive ATAK Chevrolet Corvette 09-12
Borla Cat Back System Aggressive ATAK Chevrolet Corvette 09-12
AIRAID PowerAid System Pontiac GTO 05-06
AIRAID PowerAid System Pontiac GTO 05-06
Kleemann Large Throttle System for Mercedes S 63 AMG W221 V8 06-13
Kleemann Large Throttle System for Mercedes S 63 AMG W221 V8 06-13

About Manufacturer: Unitronic
The Unitronic story is an intriguing epic. Two Mikes (Michel Szmigiel and Michal Zielinski), passionate about everything related to modified cars, share a particular profound admiration for German automobiles. The superior workmanship of these cars thoroughly embodies their vision of perfection.

The fundamental search for performance first emerged with Mike Z's purchase of a TDI 1.9L. In spite of its promises on paper, the car was too slow. At this point, however, research in engine tuning management systems did not allow the two Mikes to balance the power increase and smoothness of their ride.

Since this type of equilibrium is essential to a pleasurable driving experience, they were compelled to develop software that was more reliable, flexible, and powerful at the same time. Several years of research, development, and sampling of existing products were required to perfect their models through rigorous tests and analyses. The challenge lay in acquiring an in-depth understanding of the logic behind Bosch engineering, so that they could then coherently follow their reasoning.

Eventually, after having fully scrutinized diesel engines and listened to many friends voice dissatisfaction towards gasoline engines, the two colleagues settled upon the 1.8T platform. This decision exposed several avenues for development, due to the rarity of this type of product in the world of modified cars. These avenues attracted both Mikes, and they were each determined to follow their dreams and conquer all obstacles... but not separately. Merging passion and rigor, the two founders formed an extremely competent and unified team. Unitronic was born.

Unitronic Store | Unitronic ECU Tuning

International Sites:
click here Australia
click here Asia
click here UAE
click here Bahrain
click here Brazil
click here Canada
click here Colombia
click here New Zealand
International Sites:
click here South Africa
click here United Kingdom
click here Kuwait
click here Ukraine
click here Germany
click here Spain
click here Greece
click here Hong Kong
International Sites:
click here Indonesia
click here India
click here Italy
click here Japan
click here Korea
click here Middle East
click here Mexico
click here Malaysia
International Sites:
click here Norway
click here Philippines
click here Qatar
click here Russia
click here Saudi Arabia
click here Sweden
click here Taiwan
click here International Orders
VR Owned Sites:
click here Brembo Brakes
click here StopTech Brakes
click here Ford Performance
click here Volk Racing Wheels
click here Corvette Parts
click here Seibon Carbon Parts
click here HKS USA Parts
click here Brake Parts
VR Owned Sites:
click here VR Tuned ECU Tuning
click here HorsepowerFreaks
click here Agency Power
click here GP Helmets
click here Speedway Helmets
click here Status Racing
click here Eisenmann Exhaust
click here Kreissieg Exhaust
Top Brake Parts:
click here Power Slot Rotors
click here Brembo Sport Rotors
click here Steel Braided Brake Lines
click here Hawk Brake Pads
click here Pagid Brake Pads
click here Alcon Big Brakes
click here Drilled Rotors
click here StopTech Brakes
click here Ferodo Pads
click here Wilwood Brake Upgrade
click here Brembo Brake Kit
click here Brembo Racing Brakes
click here Slotted Rotors
click here WP Pro Brakes
Best Exhausts:
click here Capristo Exhaust
click here Porsche 997 Exhaust
click here Agency Exhaust
click here HKS Exhaust
click here Greddy Exhaust
click here Borla Catback
click here BMW M3 Exhaust
click here Eisenmann Exhaust
click here Porsche 996 Exhaust
click here FRS Header
click here BMW M5 Header
click here Remus Exhaust
click here Fabspeed Muffler
click here BMW M5 Exhaust
Top Exotic Parts:
click here Capristo
click here Akrapovic
click here Cargraphic
click here Nissan 350Z Exhaust
click here GruppeM
click here Nissan 370Z Exhaust
click here Subaru WRX STI Exhaust
click here Ferrari 360 Exhaust
click here Mansory
click here Oakley Design
click here Password JDM
click here VF Engineering
click here Wald Body Kits
click here BMW M6 Exhaust
Hot Movers:
click here Walbro Fuel Pump
click here Performance Box
click here Kelford Cams
click here Koni Shocks
click here Cosworth Pistons
click here Fabspeed Tips
click here Clutch Masters Stage 3
click here H&R Springs
click here TechArt
click here Grillcraft MX Series
click here aFe Stage 2
click here Porsche ECU Flash
click here Bilstein PSS10
click here AMS Turbo Kit
Popular Wheels:
click here Vorsteiner Wheels
click here Niche Wheels
click here BBS Wheels
click here ADV1 Wheels
click here HRE S1 Wheels
click here Volk TE37sl
click here Volk Racing
click here SSR Wheels
click here Weds Kranze
click here Enkei Racing
click here Advan Wheels
click here HRE Vintage
click here VFF 103 Wheels
click here 3SDM Wheels
Most Searched:
click here Racing Suspension Parts
click here Performance Coilovers
click here Suspension Bushings
click here Performance Air

click here Suspension Lift Kits
click here Suspension Sway Bars
click here Performance Strut Bars
click here Suspension Shocks
click here Performance Suspension

click here Suspension Mounts
click here Air Intake
click here Performance Intake
click here BMW 3 Series Exhaust