Many four-wheeler enthusiasts find the idea of squeezing a bit more power out of a regular vehicle quite tempting. One way you can get that immediate burst of speed is by using NOS (nitrous oxide). Legally, the use of NOS is prohibited on public roads, but it can be used in a racetrack, with certain regulations varying by location.
This blog explains what NOS is for vehicles, how it can boost engine performance, the benefits of using it, the risks and the importance of third party insurance.
What is NOS in cars?
NOS refers to the system that injects nitrous oxide into the vehicle’s engine air intake. Technically, nitrous oxide is a gas (N2O) that, under pressure, is stored in the form of a liquid in a NOS bottle. When it is released into the intake, it increases the oxygen content available for combustion. The nitrous systems for cars enable the extra oxygen to burn more fuel, which can yield a boost of power in a short time. This setup is often aftermarket, which means it's not originally fitted by the vehicle manufacturer.
How NOS boosts engine performance
In NOS cars, the nitrous oxide enters the intake manifold, where it decomposes because of the oxygen and heat. More oxygen makes the engine inject more fuel and burn a richer air-fuel mixture. This rich blend combusts powerfully, generating a surge in the torque and horsepower for a brief moment.
Furthermore, since the nitrous starts as a liquid under pressure, when it vaporises, it cools the intake charge. The denser and cooler air-fuel mixture can enhance the combustion efficacy and give a boost to the performance.
Benefits of using NOS in cars
Using the NOS in cars can offer these advantages when you are looking for occasional bursts of power:
1. Instant boost of power
NOS offers a near-instant increase in the vehicle’s power once it's activated, unlike the superchargers or turbochargers, which need time to build a power boost.
2. Relatively inexpensive
When compared to adding forced induction systems or primary engine modifications, the NOS might provide an affordable way to obtain additional performance, particularly when used periodically.
3. Reversibility and flexibility
Since the nitrous oxide system in cars is an add-on rather than an engine redesign, it can be easily disabled or removed, potentially restoring the vehicle to its original condition.
4. Perfect for certain uses
For occasional races, drag racing or situations that need instant bursts (such as overtaking), NOS can offer an edge without constant power changes.
Risks and drawbacks of NOS
Apart from offering many advantages, NOS also comes with several drawbacks. It’s essential to have a proper idea of what you are risking before using or installing it:
- Potential damage and engine stress: NOS increases heat and pressure, which can break or strain engine parts when the engine is not strong enough.
- Requires proper tuning: NOS needs an adequate fuel supply, strong engine internals and ignition timing. Poor tuning can lead to sudden failure or overheating.
- Temporary power only: The power boost might last till the nitrous is available. Once the bottle empties, the performance returns to normal.
- Higher supervision costs: NOS use leads to periodic refills, possible replacement of stress components and more engine inspections.
- Safety risks: The NOS bottles store high-pressure gas. So poor installation, damaged lines or leaks might lead to dangerous situations.
Legal aspects of using NOS in India
In India, altering a vehicle’s engine performance or capacity without permission can be problematic under the regulations set by the Regional Transport Office (RTO). Installing a NOS kit may be viewed as an unauthorised modification, particularly if it increases the engine's performance or impacts the emission output. This is because the emission standards (especially the ones tied to the Bharat Stage emission standards) are strictly enforced. Any changes made to the vehicle that risk increasing emissions might lead to legal issues.
This might mean that a car with the NOS kit used on public roads could be considered illegally modified. It can lead to complications or penalties during inspections.
NOS effect on car insurance
Car insurance policies are issued based on the vehicle’s specifications as declared to the insurer at the time of purchase. Installing a nitrous oxide system is considered a major performance modification. If such a modification is made without informing the insurance company when purchasing car insurance online, it can lead to policy complications or even rejection of claims.
Most insurers treat unauthorised or undeclared modifications as a breach of policy terms. If an accident, engine failure or any damage occurs and is linked directly or indirectly to the use of an NOS kit, the insurer may deny the claim.
Safer alternatives to NOS for performance tuning
Since using a NOS gas car raises many legal issues and risks, many individuals look for alternatives that enhance performance and are much safer. Here are some of the alternatives you may opt for:
1. ECU tuning/engine remapping
Adjusting ECU settings can help the engine function more efficiently and also offer a safer and smoother power gain without any heavy modification.
2. Periodic upkeep and good fuel
Keeping the vehicle’s engine in better condition and using top-quality fuel can improve performance naturally and also avoid unnecessary damage or stress.
3. Supercharging/turbocharging
These systems can compress air into the car’s engine for much stronger and steadier power. This makes them more controlled than the NOS bursts.
Conclusion
Using NOS provides a short-term boost in power by increasing oxygen and fuel combustion, improving torque and horsepower, but it also raises engine stress, safety risks, and the chance of mechanical failure.
Remember, third-party insurance is mandatory and covers damage to another person’s vehicle, property or injury caused by your car.
FAQs
1. Can NOS be used daily in a regular vehicle?
NOS is not ideal for daily use, as it puts extra stress on the engine and may not comply with road-use regulations.
2. Is NOS legal in India?
NOS use on public roads is generally restricted. Legality depends on local RTO rules and approvals, so you should verify with your regional RTO.
3. Does NOS damage engines?
NOS can damage an engine if it is poorly installed, improperly tuned or used beyond safe limits.
Disclaimer: The information provided in this blog is for educational and informational purposes only. It may contain outdated data and information regarding the topic featured in the article. It is advised to verify the currency and relevance of the data and information before taking any major steps. ICICI Lombard is not liable for any inaccuracies or consequences resulting from the use of this outdated information.
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