Utilizing Nitrous Oxide to Boost Your Supercharger Performance

There arrives a level in your electrical power buildup exactly where you may perhaps take into consideration adding nitrous oxide injection to your supercharged car or truck. This issue typically coincides with reaching a amount of performance that usually means amplified investment and diminishing returns from your supercharger. For case in point, my auto arrives from the manufacturing facility with a 5th era Eaton MP45 supercharger. This supercharger is confined to about 230hp worthy of of flow ranking and so no matter what I do with bolt-on upgrades on my motor, my peak horsepower will not exceed 230hp restrict due to the fact that is the place at which the supercharger will become the bottle neck in my method.

As we have talked about in prior article content there is nevertheless the choice of porting the factory supercharger for a 10 to 15% achieve in ability (which in this circumstance would be an additional 23 to 35 horsepower). There is also the solution of retrofitting a larger supercharger this kind of as the Eaton M62 to obtain prospective up to around 300hp depending on the closing choice of a supercharger.

This modification path (porting or changing the manufacturing facility supercharger) can establish to be complex and high priced, in particular if the supercharger is built-in into the consumption manifold (and probably an air to water intercooler) as the case is with lots of manufacturing facility supercharged cars and trucks.

A possible viable remedy for this scenario is to use nitrous oxide injection to dietary supplement the power shipping and delivery when racing, and getting satisfied with a trusted decreased run car or truck when the nitrous is off and we’re not racing.

The rationale why nitrous oxide (N2O) results in being a wonderful electric power adder is twofold:

1- Nitrous is cheap as far as horsepower for each greenback goes, and specifically in the conditions where by we’re previously supercharged and so will only be using it on the unusual instances when we do strike the keep track of.

2- Nitrous oxide is a great ‘chiller’ as it comes out of the bottle at a temperature of unfavorable 127*F and is able of cooling the general supercharged air cost mixture by more than 100*F as documented by fans, this is an supplemental temperature reduction around the consequences of whatever intercooler you have equipped. This in-fact would make nitrous a terrific proposition for vehicles that have previously maxed out their superchargers, where the supercharger is jogging at peak rpms and generating very significant outlet temperatures. The nitrous oxide injection can correctly increase the thermal effectiveness of the supercharger when it is most stressed out and give us a wonderful, awesome, and dense combination.

3- Nitrous oxide fuel delivery is quite straight forward to set up and to tune, primarily on more recent model autos with return-les gasoline methods, or hard to crack desktops that make it challenging to update (and properly tune) a a great deal larger sized supercharger set up. Nitrous oxide gas shipping and delivery can be established-up absolutely independently from the OEM European and gasoline process and so makes nitrous a attainable application for German cars and trucks with stubborn personal computers.

4- This is a racer method… most vehicles feel to perform superior during the winter months due to the fact the air is cooler, horsepower is elevated, and the tracks despite the fact that chilly, can be ready for traction and will heat up sufficient throughout the night to permit for traction and to give people the potential to exploit the chilly dense air to put up their best instances of the year. As the weather conditions gets warmer, traction increases since the asphalt is heat and sticky, but horsepower is lowered because of to hotter, fewer dense air. Ordinarily racers obtain that their cars change in their quarter mile effectiveness by as substantially as a half a 2nd concerning their summer time tune and their winter season tune, specially if you are using a supercharger or turbocharger that compresses (and further more heats) the incoming air.

The solution to on-keep track of regularity, racers have discovered, is to blend the use of nitrous oxide (which is summer time pleasant) with compelled induction (superchargers and turbochargers) which are wintertime pleasant. In the summer season time, the exterior temperature is significant, and so the nitrous bottle tension is managed at a large degree above 1100 psi. This permits for a generous nitrous circulation amount underneath the sustained pressure (even without the need of a bottle heater) which presents great summer performance for nitrous assisted automobiles. When in the winter, the outdoors temperatures drop noticeably, the nitrous in the bottle contracts and the bottle tension drops, subsequently, the nitrous move level drops and nitrous assisted automobiles show worse general performance in the winter occasions.

The total opposite is accurate for supercharged cars and trucks that make excellent horsepower in the wintertime from compressing cool dense air, and poor horsepower in the summer months heat. When you mix these two ability adders you get very flat and regular horsepower output calendar year round due to the fact the supercharger shines when the nitrous is weak, and the nitrous shines when the supercharger is weak, and consequently jointly, they give regular electrical power produce yr spherical.

Pre-cautions:

Now we have to think about that nitrous oxide is an oxidizer and therefore not only does it increase the sum of air and fuel combusting in the cylinder, but it also provides a more quickly shifting flame entrance due to the oxidizer attributes of the nitrous oxide. This means that more timing retard, fantastic octane fuel, and maybe colder spark plugs will be demanded to operate spray on a supercharged auto. On top of that, simply because of its cooling influence, a 100hp shot on a supercharged Camaro can extremely effortlessly put down Above 120 rear wheel horsepower of additional energy. This usually means that the ‘out of the box’ jetting of a nitrous package could not be ample on a supercharged automobile and you’d have to make sure to keep an eye on and probably increase the gasoline jetting to match the last horsepower figure of your car). Very last but not the very least, if you might be working a 500hp supercharged motor vehicle with an further 120hp of nitrous oxide injection, then you will have to make positive that your gas supply (fuel pump and gas strains) are able to flow the full amount of money of fuel required to supply 620hp.

Purposes scenarios:

1- You have a automobile like mine, a 2005 C230 kompressor that comes with a 230hp restricted Eaton MP45. European on the car or truck is a Siemens Eu that incredibly couple of individuals know how to tune, and the fuel procedure makes use of a return-considerably less set up with an in-tank fuel strain regulator. With this variety of setup all sorts of dry nitrous injection are out of the concern for the reason that we can neither compensate for gasoline as a result of flashing the manufacturing unit Ecu, nor can we elevate gasoline force for the duration of the nitrous injection for the reason that the fuel force regulator is in-available….

Advised kit:

A wet nitrous injection package that injects each fuel and nitrous oxide from the injection nozzle.

Injection locale:

After the supercharger, right after the intercooler, and into the consumption manifold of the car or truck.

Most encouraged injection:

25% of the initial total ability figure which corresponds to all-around a 50 hp shot of nitrous on our illustration.

Anticipated final horsepower:

60 to 65 wheel horsepower and probable about 130 ft-lbs of extra torque!

2- You have a vehicle that has an available gasoline stress regulator, or an Eu that can be re-flashed for nitrous oxide or a ‘dual tune’ setup. In this scenario it is proposed to use a dry nitrous package for two explanations:

First: Dry kits are safer on supercharged cars (as long as the fuel shipping and delivery as a result of the injectors or raised gasoline strain is satisfactory) simply because they maintain a lowered chance of ingestion backfires for the reason that the consumption manifold is dry of gas.

Next: Dry nitrous injection contains no fuel, and so we do not want to fret about gasoline falling out of suspension from the injected air. This suggests that we no more time have to spray the nitrous appropriate before the consumption manifold and we now have the solution to go the point of injection considerably farther back. Spraying nitrous Just before the intercooler, proper right after the supercharger offers the nitrous stream much more time and extra make contact with with the compressed air coming out of the supercharger which effects in much more cooling and more amplified horsepower.

Advised package:

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

Injection area:

Soon after the supercharger, ahead of or immediately after the intercooler and not always right at the intake manifold of the motor vehicle.

Maximum advised injection:

25% of the initial overall electrical power figure which corresponds to about a 50 hp shot of nitrous.

Anticipated remaining horsepower:

70-75 wheel horsepower and probable about 130 ft-lbs of extra torque!

3- You have a vehicle that has an obtainable fuel tension regulator, or an European that can flashed for nitrous oxide or a ‘dual tune’ set up. You also want to make as a great deal horsepower as attainable from your nitrous…

In this case it is suggested to use a dry nitrous kit injecting right before the supercharger. As we described in our articles on twin charging (combining turbochargers with superchargers for extra general performance), when two ‘chargers’ are chained in series in which one charger feeds the upcoming, then the two strain ratios of the charger merge simply because the 2nd charger compresses air that is now compressed by the initially. For instance two turbochargers established for a 1.5 force ratio (or 7 psi of enhance), operating in sequential mode will final result in a final force ratio of 2.25 bar (or 18psi of improve) which is much more than the ‘expected’ 14psi that is the sum of the two raise ranges.

Similarly, injecting nitrous oxide in advance of the supercharger, delivers by now compressed air. This is genuine weather conditions we are conversing about nitrous being compressed mainly because it has two times the oxygen concentration as normal air or we’re chatting about the nitrous cooling and compressing the incoming air. The closing sum of compression noticed by the supercharger inlet will change dependent on the ratio of incoming air to the measurement of the nitrous shot, and can end result in an raise in raise of among .5 to 2.5 psi!

This strengthen enhance is in addition to the electric power improve of the nitrous oxide injection and so it can be an further 5 to 25 hp.

Recommended package:

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

Injection place:

Before the supercharger inlet.

Highest recommended injection:

25% of the primary total electrical power figure which corresponds to all over a 50 hp shot of nitrous.

Predicted last horsepower:

75-100 wheel horsepower and achievable about 160 ft-lbs of extra torque!

Factors to steer clear of:

1- No make a difference where you set up the nitrous injection, make confident not to spray nitrous into your MAS air move sensor or your consumption air temperature sensor. These temperature dependent sensors, explain to the Ecu to progress the timing in colder situations. As we talked about previously, nitrous is an oxidizer that increases the speed of journey of the combustion party and as a result demands managed (if not retarded) ignition timing compared to a supercharged only setup. Stay clear of spraying on these temperature delicate sensors to avert accidental timing advance from taking place.

2- Keep away from spraying a moist kit (fuel) just before your supercharger, as the wet gas mist will problems the supercharger rotors and strip their coatings.

3- Make confident you test your air gasoline ratio on the nitrous and really don’t stick to the ‘out of the box’ air to fuel configurations with the kit. For illustration an extra 2.5 psi in your consumption could or might not be compensated by your stock European and so based on how properly the Ecu reacts you will have to alter the gas jetting on the nitrous package.