Employing Nitrous Oxide to Enhance Your Supercharger Performance

There comes a place in your energy buildup the place you may possibly take into consideration adding nitrous oxide injection to your supercharged vehicle. This level normally coincides with reaching a degree of effectiveness that means improved financial investment and diminishing returns from your supercharger. For illustration, my vehicle arrives from the manufacturing unit with a 5th generation Eaton MP45 supercharger. This supercharger is restricted to about 230hp really worth of move ranking and so no make a difference what I do with bolt-on updates on my motor, my peak horsepower will not exceed 230hp limit simply because that is the place at which the supercharger gets the bottle neck in my method.

As we’ve talked about in former articles there is however the option of porting the manufacturing unit supercharger for a 10 to 15% get in capacity (which in this situation would be a different 23 to 35 horsepower). There is also the selection of retrofitting a larger sized supercharger these as the Eaton M62 to obtain possible up to about 300hp depending on the final preference of a supercharger.

This modification path (porting or changing the manufacturing unit supercharger) can prove to be intricate and high-priced, specially if the supercharger is integrated into the consumption manifold (and maybe an air to h2o intercooler) as the scenario is with numerous factory supercharged cars and trucks.

A doable practical answer for this predicament is to use nitrous oxide injection to complement the energy shipping when racing, and staying satisfied with a reliable lower driven car when the nitrous is off and we are not racing.

The explanation why nitrous oxide (N2O) gets a fantastic power adder is twofold:

1- Nitrous is cheap as much as horsepower for each greenback goes, and particularly in the situations exactly where we’re previously supercharged and so will only be applying it on the rare situations when we do hit the track.

2- Nitrous oxide is a wonderful ‘chiller’ as it will come out of the bottle at a temperature of unfavorable 127*F and is capable of cooling the all round supercharged air demand mixture by more than 100*F as reported by fanatics, this is an extra temperature reduction in excess of the results of whatever intercooler you have fitted. This in-reality would make nitrous a fantastic proposition for automobiles that have already maxed out their superchargers, where by the supercharger is managing at peak rpms and producing very higher outlet temperatures. The nitrous oxide injection can properly raise the thermal effectiveness of the supercharger when it is most stressed out and give us a pleasant, amazing, and dense combination.

3- Nitrous oxide gas shipping is quite straight ahead to set up and to tune, specifically on newer design cars and trucks with return-les gas systems, or difficult to crack pcs that make it challenging to improve (and properly tune) a considerably larger sized supercharger setup. Nitrous oxide gas supply can be set-up entirely independently from the OEM Ecu and fuel process and therefore makes nitrous a feasible application for German cars and trucks with stubborn computers.

4- This is a racer approach… most automobiles seem to complete improved all through the wintertime months since the air is cooler, horsepower is elevated, and the tracks despite the fact that cold, can be ready for traction and will heat up enough during the night to allow for for traction and to give people the means to exploit the chilly dense air to post their finest occasions of the yr. As the temperature will get warmer, traction increases for the reason that the asphalt is warm and sticky, but horsepower is diminished owing to warmer, less dense air. Ordinarily racers uncover that their cars vary in their quarter mile general performance by as a lot as a 50 % a next between their summer months tune and their winter season tune, in particular if you’re using a supercharger or turbocharger that compresses (and further more heats) the incoming air.

The remedy to on-monitor consistency, racers have discovered, is to combine the use of nitrous oxide (which is summer months friendly) with forced induction (superchargers and turbochargers) which are wintertime pleasant. In the summer time, the exterior temperature is superior, and so the nitrous bottle strain is preserved at a higher level over 1100 psi. This lets for a generous nitrous movement price beneath the sustained force (even without a bottle heater) which provides excellent summer functionality for nitrous assisted cars. Even though in the winter, the outside temperatures fall substantially, the nitrous in the bottle contracts and the bottle force drops, subsequently, the nitrous move price drops and nitrous assisted vehicles display even worse effectiveness in the winter season periods.

The finish reverse is legitimate for supercharged autos that develop good horsepower in the wintertime from compressing neat dense air, and weak horsepower in the summer months warmth. When you mix these two energy adders you get very flat and regular horsepower output year round due to the fact the supercharger shines when the nitrous is weak, and the nitrous shines when the supercharger is weak, and therefore jointly, they give regular electric power supply yr round.


Now we have to look at that nitrous oxide is an oxidizer and as a result not only does it enhance the sum of air and gasoline combusting in the cylinder, but it also generates a speedier transferring flame front because of to the oxidizer homes of the nitrous oxide. This usually means that extra timing retard, great octane fuel, and quite possibly colder spark plugs will be expected to run spray on a supercharged vehicle. Additionally, mainly because of its cooling impact, a 100hp shot on a supercharged Camaro can very simply place down About 120 rear wheel horsepower of supplemental electric power. This suggests that the ‘out of the box’ jetting of a nitrous kit may possibly not be satisfactory on a supercharged car and you’d have to make confident to check and probably raise the gasoline jetting to match the last horsepower figure of your automobile). Past but not minimum, if you’re functioning a 500hp supercharged vehicle with an additional 120hp of nitrous oxide injection, then you ought to make confident that your fuel supply (fuel pump and gas lines) are ready to move the whole volume of gas required to provide 620hp.

Apps eventualities:

1- You have a car like mine, a 2005 C230 kompressor that arrives with a 230hp limited Eaton MP45. Eu on the motor vehicle is a Siemens Eu that quite number of persons know how to tune, and the gasoline system works by using a return-much less set up with an in-tank gas force regulator. With this type of setup all sorts of dry nitrous injection are out of the question for the reason that we can neither compensate for gasoline by flashing the manufacturing unit Eu, nor can we elevate fuel strain in the course of the nitrous injection for the reason that the gas stress regulator is in-accessible….

Proposed kit:

A damp nitrous injection kit that injects both equally gasoline and nitrous oxide from the injection nozzle.

Injection location:

Immediately after the supercharger, immediately after the intercooler, and into the intake manifold of the car or truck.

Most proposed injection:

25% of the initial whole power figure which corresponds to all around a 50 hp shot of nitrous on our example.

Anticipated closing horsepower:

60 to 65 wheel horsepower and achievable about 130 ft-lbs of added torque!

2- You have a vehicle that has an accessible gas tension regulator, or an European that can be re-flashed for nitrous oxide or a ‘dual tune’ set up. In this scenario it is advisable to use a dry nitrous package for two motives:

Very first: Dry kits are safer on supercharged autos (as lengthy as the gas shipping by way of the injectors or lifted gas force is ample) since they maintain a reduced probability of ingestion backfires for the reason that the ingestion manifold is dry of gasoline.

Next: Dry nitrous injection consists of no gasoline, and so we you should not will need to fret about fuel falling out of suspension from the injected air. This usually means that we no for a longer period have to spray the nitrous proper prior to the intake manifold and we now have the solution to move the place of injection substantially farther back. Spraying nitrous Before the intercooler, proper right after the supercharger provides the nitrous stream additional time and far more get hold of with the compressed air coming out of the supercharger which final results in much more cooling and further more improved horsepower.

Encouraged package:

A dry nitrous injection kit that injects only nitrous oxide from the injection nozzle.

Injection area:

Just after the supercharger, just before or following the intercooler and not always ideal at the intake manifold of the car or truck.

Most advised injection:

25% of the initial full electric power figure which corresponds to close to a 50 hp shot of nitrous.

Envisioned remaining horsepower:

70-75 wheel horsepower and feasible about 130 ft-lbs of added torque!

3- You have a motor vehicle that has an obtainable gasoline force regulator, or an Eu that can flashed for nitrous oxide or a ‘dual tune’ set up. You also want to make as significantly horsepower as doable from your nitrous…

In this scenario it is proposed to use a dry nitrous package injecting just before the supercharger. As we described in our articles on twin charging (combining turbochargers with superchargers for added performance), when two ‘chargers’ are chained in series wherever a person charger feeds the subsequent, then the two pressure ratios of the charger incorporate since the next charger compresses air that is already compressed by the initially. For case in point two turbochargers established for a 1.5 tension ratio (or 7 psi of raise), working in sequential mode will end result in a closing tension ratio of 2.25 bar (or 18psi of boost) which is more than the ‘expected’ 14psi that is the sum of the two improve concentrations.

Equally, injecting nitrous oxide ahead of the supercharger, delivers previously compressed air. This is real weather we are conversing about nitrous staying compressed mainly because it has twice the oxygen focus as standard air or we are speaking about the nitrous cooling and compressing the incoming air. The ultimate volume of compression noticed by the supercharger inlet will differ depending on the ratio of incoming air to the sizing of the nitrous shot, and can final result in an increase in boost of amongst .5 to 2.5 psi!

This raise boost is in addition to the ability maximize of the nitrous oxide injection and so it can be an further 5 to 25 hp.

Encouraged kit:

A dry nitrous injection kit that injects only nitrous oxide from the injection nozzle.

Injection place:

In advance of the supercharger inlet.

Highest advised injection:

25% of the original full ability figure which corresponds to all over a 50 hp shot of nitrous.

Predicted closing horsepower:

75-100 wheel horsepower and probable about 160 ft-lbs of supplemental torque!

Factors to stay clear of:

1- No matter exactly where you set up the nitrous injection, make certain not to spray nitrous into your MAS air move sensor or your consumption air temperature sensor. These temperature dependent sensors, tell the European to advance the timing in colder conditions. As we described earlier, nitrous is an oxidizer that boosts the speed of journey of the combustion event and therefore calls for maintained (if not retarded) ignition timing compared to a supercharged only set up. Prevent spraying on these temperature sensitive sensors to stop accidental timing advance from happening.

2- Stay clear of spraying a soaked kit (gas) just before your supercharger, as the moist gasoline mist will injury the supercharger rotors and strip their coatings.

3- Make guaranteed you look at your air fuel ratio on the nitrous and you should not stick to the ‘out of the box’ air to fuel settings with the package. For instance an additional 2.5 psi in your intake might or may perhaps not be compensated by your stock European and so based on how well the Eu reacts you will have to regulate the gasoline jetting on the nitrous kit.