About Speedfactorshop
About Speedfactor
Speedfactorshop is the online shopping site for car parts we sell in store at Speedfactor Ltd. We started Speedfactor in 2001 to help the growing performance car scene in Tauranga. Now after more than 24 years in the industry and moving with continual changes in the performance and race car scenes, Speedfactor has become one of New Zealands leading performance car parts importers specialising in engine components, suspension components, Japanese & European car parts, Silicone, Aluminium Stainless steel, Auto Plumbing plus much more...
As well as our comprehensive performance and race parts inventory, we also have a fully equipped workshop focusing on engine building, street & performance car preparation and modifications.
We endevour to have all of our online store parts available in New Zealand, so no waiting weeks for your goods after you place your order, unlike some of the other online stores! Payments are not processed until stock is physically checked and confirmed as available.
Fabrication & Welding
Welding & Fabrication by SpeedFactor
At SpeedFactor, we offer high-quality welding and custom fabrication services tailored to performance vehicles, race builds, and custom projects. From small modifications to full bespoke setups, our skilled fabricators deliver strong, clean, and reliable work that performs under pressure — on the street, strip, or track.
Our Welding & Fabrication Services Include:
Custom exhaust systems and manifolds
Intercooler and radiator piping
Catch can setups and custom brackets
Fuel system fabrication (fuel cells, hard lines, surge tanks)
and Much More.....
Based in Tauranga, our workshop is equipped to handle a wide range of fabrication jobs in mild steel, stainless steel, and aluminium, using TIG and MIG welding processes depending on your needs. We specialize in performance-focused fabrication with an emphasis on fitment, strength, and flow. Whether you're modifying an existing setup or building something one-of-a-kind, we work closely with you to bring your vision to life with the right materials, weld quality, and finish.
Need parts too? We stock a wide range of flanges, V-band kits, bends, piping, and fabrication components — everything needed to complete your project under one roof.
📍 Located in Tauranga | Performance Fabrication Specialists |
Engine Machining
Engine Machining by SpeedFactor
At SpeedFactor, we offer precision engine machining services to meet the demands of high-performance builds, classic restorations, and everyday engine repairs. With decades of experience and top-tier equipment, our Tauranga-based workshop delivers reliable, high-quality machining for street, race, and marine applications.
Whether you're rebuilding a factory engine or chasing high-horsepower goals, our expert machinists provide the accuracy and attention to detail your build deserves.
Our Engine Machining Services Include:
Block boring & honing
Cylinder head resurfacing
Valve seat cutting & guide installation
Crankshaft grinding & balancing
Flywheel machining
Performance engine blueprinting
Full engine assembly
We work with a wide range of engines — from JDM to Euro and everything in-between. Every job is completed to the highest standard, using quality parts and proven techniques.
Need help selecting parts or planning your build? We can also supply everything from forged pistons to performance gaskets, all under one roof.
📍 Based in Tauranga
Engine Building
Performance Engine Assembly by SpeedFactor
At SpeedFactor, our performance engine assembly service is built on precision, experience, and a deep understanding of what it takes to build a reliable and powerful engine. Whether you're building for street use, motorsport, marine, or boosted applications, our Tauranga-based workshop delivers high-quality, detail-oriented engine assemblies tailored to your exact needs.
We offer full engine assembly for a wide range of platforms — JDM, Euro, American and more — using proven techniques and premium components. Every build begins with proper planning, detailed measurement, and component inspection to ensure everything fits and functions exactly as intended.
Our Engine Assembly Process Includes:
Component Cleaning & Inspection
All engine parts are thoroughly cleaned and inspected for wear, defects, or inconsistencies before assembly. This includes checking block deck height, journal surfaces, piston crown height, rod condition, and crankshaft tolerances.
Clearancing & Blueprinting
We precision-measure all critical tolerances including bearing clearances, piston-to-wall clearance, ring end gaps, crank end float, and rod side clearance. Where required, we clearance and modify components to suit specific performance goals.
Bottom-End Assembly
Crankshaft installation is performed with proper main bearing selection and torque specs. Rod and piston assemblies are matched by weight, rings gapped to suit your application (street, turbo, E85, etc.), and everything is installed with high-pressure lubes and fastener stretch/tension verification.
Top-End Assembly
Cylinder heads are checked for flatness and properly torqued using the correct pattern and angle specs. Valve trains are installed and adjusted (shimmed or lash set), cam timing is precisely dialed in (where applicable), and VVT/VTEC systems are verified.
Sealing & Final Assembly
We use high-quality gaskets, sealants, and fasteners to ensure long-term reliability. Oil pump and water pump installation, front and rear main seals, sump, timing covers, and manifolds are all installed with attention to detail and cleanliness.
Optional Services
Parts sourcing & advice throughout your build
Full dynamic engine balancing
Custom engine break-in setup
Degreeing camshafts.
Whether you're building a mild street motor or a 1000+ HP drag engine, we treat every build with the same precision and care. Combine our engine assembly with our in-house machining, and fabrication expertise for a complete, performance-proven solution.
📍 Based in Tauranga | NZ-Wide Builds Welcome |