Asked Questions

  • Which Yamaha engines can have a NIZPRO Performance Tune?

  • Is reliability and durability compromised in any way by adding a Nizpro 450s Supercharger to a naturally aspirated engine?

    The Yamaha V6 4.2L is an extremely well engineered product.

    In its highest production level (300HP), it makes a mere 71hp per litre at 6,000 rpm maximum engine speed.

    The standard Yamaha V6 4.2L is also engineered with high quality connecting rods, oil cooled pistons and a compression ratio low enough to be the perfect platform for forced induction (supercharging).

    During our own durability testing program, Nizpro tested well beyond the 450hp power level using higher rpm and substantially higher boost pressures to ensure no compromise to the Yamaha V6 4.2L reliability and durability. Of course, routine and regular scheduled maintenance must be carried out to maintain overall outboard integrity and peak performance.

  • Is reliability and durability compromised by Reflashing my Yamaha engine?


    Reflashing or tuning is about taking a great product and refining it.

    We do NOT tune to the limits of the engine, we optimise the existing performance without impacting reliability.

    Additional hp, no extra weight
    Additional torque, no extra weight
    Improved fuel economy, from lower RPM

  • Is my standard lower unit strong enough to handle the hp upgrade?

    The standard Yamaha V6 4.2L lower unit is both strong and durable.

    That’s why we chose Yamaha when we commenced developing high performance products for marine outbooards.

    Nizpro Marine recommends regular scheduled maintenance and high quality lubricants to ensure long term reliability. Correct fuel octane is also critical.

    If the engine has been Supercharged and is used for racing, Nizpro also recommends upgrading to a Nizpro Marine Solid Engine Mount Kit and also a hand built, heavy duty lower unit with fat shaft, heavy duty bearing carrier and even bespoke nose cones.

  • World class production and manufacturing partners deliver a world class product.

    From the initial design concept of the Nizpro 450s supercharger package for the Yamaha VMax SHO and Offshore 4.2 litre V6 engine, Nizpro chose to partner with Harrop Engineering and Eaton Corporation.
    Harrop, renowned for their world class product design and production capabilities and Eaton Corporation to utilise their leading TVS Supercharger Technology.

    Nizpro knew that working in partnership with the best OEM partners would ensure outstanding product performance & reliability and now 8 years later, that has proven to be exactly the case.

  • Fuel Requirements

    Nizpro recommend the best quality fuel for all Yamaha engines to optimise performance and all of our performance products are developed on 98 Australian RON.


    The Nizpro 450s Supercharger requires the following fuel for maximum performance:

    • Recommended fuel – 91 USA pump octane or 98 Australian RON octane
    •  Minimum fuel – 89 USA pump octane or 95 Australian RON octane.
    • Note that maximum power output may not be achieved when running lower rated fuels
  • Why Recalibrating/Tuning development must be performed on a marine dyno.

    Thinking of Reflashing your engine, but heard horror stories at the boat ramp of engine failures?

    The Nizpro Marine Testing Facility is at the core of why of NIZPRO tunes produce high performance gains without compromising engine reliability or longevity.

    Our goal – Optimise engine performance to –
    1. Improve the overall performance adding HP and torque, and adjusting rpm limits to broaden power delivery curves
    2. A focus on improved fuel efficiency at cruising rpms
    3. Give a greater torque spread and mximise throttle response

    Nizpro Marine Tunes are developed exclusively on our state-of-the-art Vertical Inhouse Marine Dyno which enables us to data log and recalibrate the complete tuning map, something that cannot be done accurately when on the water.

  • A number of reasons why on-water tuning (only) makes it impossible to achieve reliable results – and why we use a static dyno cell.

    On the water, you do not have the range of input sensors available to provide real time results, which allow for adjustments and calibrations for climate including atmospheric pressure and temperature.
    You can only calibrate to the atmospheric conditions on that day.
    Tuners will normally try and listen to the engine to hear for spark knock. On water testing in a boat with boat & engine noise make it nearly impossible to hear and very inaccurate.
    Compare this to the engine working under every possible load, rpm and temperature condition that are adjustable on the dyno.

    We are able to listen and monitor audible spark knock and monitor internal cylinder pressure by measuring cylinder pressure through multiple sensors on individual cylinders all at one time, thousands of times per second.

    Speed and boat movement – try sitting in a boat, holding onto a laptop computer at 100miles an hour, while dodging waves and other boats and you understand why a static dyno is so important.

    Our state-of-the-art dyno also means we can log the 100’s of hours required to ensure that our tunes ensure the best performance possible.

  • What is knocking, and why you don’t want it!

    Knocking (also knock, detonation, spark knock, pinging or pinking) in spark ignition, internal combustion engines occurs when the fuel-air charge in the cylinder combusts at the wrong time. The fuel-air charge is meant to be ignited by the spark plug only, and at a precise point in the piston’s stroke.

    Knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle.

    The shock wave creates the characteristic metallic “pinging” sound, and cylinder pressure increases dramatically.

    Effects of engine knocking can range from inconsequential to complete destruction.

    Nizpro’s dyno tune development and stringent processes ensure that your engine will perform exactly as Yamaha designed it to.

  • How do I buy Nizpro Marine Marine Performance Products?

    We have a few options –

    Nizpro Marine Performance Products are available from one of Nizpro Authorised Dealers around the world or direct from Nizpro Marine.

    Check out our FIND A DEALER tab for your local dealer –

    Our secure online shop ships worldwide using DHL Express shipping, usually delivering within 5-10 days anywhere in the world.


    Drop us an email [email protected]

    , make sure to include your engine(s) model and year and we can answer any questions you may have.

  • Purchasing online and having trouble?

    At the Checkout –select BLUE AUD tab.

    This converts the transaction $ amount from the displayed USD to AUD, and will let you complete your purchase.

    After adding your name and address details, hit the PLACE ORDER button & you will then be able to add your card details.

    Please note – We only accept Mastercard or Visa.

  • How do I know my order went through?

    Once your order payment has been processed, we receive notification from the website and you receive an email with your receipt.

  • Why you have to change to $AUD to check out?

    We use $USD for our website pricing, but as we are in Australia, our Credit Card facility requires the amount to be converted to the equivalent $AUD amount at the time of the sale.
    The purchase amount is the same as the USD equivalent.

    The rate is calculated using the current bank rate.

  • Shipping – How long?

    We use DHL Express and ship Monday – Friday. We have found DHL to be the fastest, and most reliable.

    If your order is paid for before 2.00pm weekdays, we will be able to ship it out that day, otherwise next day. Once it has gone we will send you a link to track your goods via the DHL website.

    Average Delivery Times
    – 1-3 days – Australia
    – 5-7 days – US and Europe