Utilizing Nitrous Oxide to Increase Your Supercharger Efficiency
There comes a degree in your energy buildup the place you might think about including nitrous oxide injection to your supercharged automotive. This level usually coincides with reaching a stage of efficiency meaning elevated funding and diminishing returns out of your supercharger. For instance, my automotive comes from the manufacturing unit with a fifth era Eaton MP45 supercharger. This supercharger is proscribed to about 230hp value of stream ranking and so it doesn’t matter what I do with bolt-on upgrades on my engine, my peak horsepower is not going to exceed 230hp restrict as a result of that’s the level at which the supercharger turns into the bottle neck in my system.
As we have talked about in earlier articles there’s nonetheless the choice of porting the manufacturing unit supercharger for a ten to fifteen% acquire in capability (which on this case can be one other 23 to 35 horsepower). There may be additionally the choice of retrofitting a bigger supercharger such because the Eaton M62 to achieve potential as much as over 300hp relying on the ultimate alternative of a supercharger.
This modification path (porting or changing the manufacturing unit supercharger) can show to be complicated and dear, particularly if the supercharger is built-in into the consumption manifold (and presumably an air to water intercooler) because the case is with many manufacturing unit supercharged automobiles.
A attainable viable answer for this case is to make use of nitrous oxide injection to complement the facility supply when racing, and being glad with a dependable decrease powered automotive when the nitrous is off and we’re not racing.
The rationale why nitrous oxide (N2O) turns into an excellent energy adder is twofold:
1- Nitrous is reasonable so far as horsepower per greenback goes, and particularly within the conditions the place we’re already supercharged and so will solely be utilizing it on the uncommon events after we do hit the monitor.
2- Nitrous oxide is a good ‘chiller’ because it comes out of the bottle at a temperature of detrimental 127*F and is able to cooling the general supercharged air cost combination by over 100*F as reported by lovers, that is a further temperature discount over the results of no matter intercooler you might have fitted. This in-fact makes nitrous an excellent proposition for automobiles which have already maxed out their superchargers, the place the supercharger is working at peak rpms and producing very excessive outlet temperatures. The nitrous oxide injection can successfully enhance the thermal effectivity of the supercharger when it’s most wired and provides us a pleasant, cool, and dense combination.
3- Nitrous oxide gas supply is pretty straight ahead to setup and to tune, particularly on newer mannequin automobiles with return-les gas methods, or troublesome to crack computer systems that make it troublesome to improve (and correctly tune) a a lot bigger supercharger setup. Nitrous oxide gas supply will be set-up completely independently from the OEM ECU and gas system and thus makes nitrous a attainable software for German automobiles with cussed computer systems.
4- This can be a racer approach… most automobiles appear to carry out higher in the course of the winter months as a result of the air is cooler, horsepower is elevated, and the tracks though chilly, will be ready for traction and can warmth up sufficient in the course of the evening to permit for traction and to offer folks the power to use the chilly dense air to publish their finest occasions of the yr. Because the climate will get hotter, traction will increase as a result of the asphalt is heat and sticky, however horsepower is decreased resulting from hotter, much less dense air. Usually racers discover that their automobiles differ of their quarter mile efficiency by as a lot as a half a second between their summer season tune and their winter tune, particularly should you’re utilizing a supercharger or turbocharger that compresses (and additional heats) the incoming air.
The answer to on-track consistency, racers have discovered, is to mix using nitrous oxide (which is summer season pleasant) with pressured induction (superchargers and turbochargers) that are winter pleasant. In the summertime time, the skin temperature is excessive, and so the nitrous bottle strain is maintained at a excessive stage above 1100 psi. This permits for a beneficiant nitrous stream fee underneath the sustained strain (even with no bottle heater) which supplies nice summer season efficiency for nitrous assisted automobiles. Whereas within the winter, the skin temperatures drop considerably, the nitrous within the bottle contracts and the bottle strain drops, subsequently, the nitrous stream fee drops and nitrous assisted automobiles present worse efficiency within the winter occasions.
The exact opposite is true for supercharged automobiles that produce nice horsepower within the winter from compressing cool dense air, and poor horsepower in the summertime warmth. If you mix these two energy adders you get fairly flat and constant horsepower manufacturing yr spherical as a result of the supercharger shines when the nitrous is weak, and the nitrous shines when the supercharger is weak, and thus collectively, they offer constant energy ship yr spherical.
Precautions:
Now we’ve to think about that nitrous oxide is an oxidizer and thus not solely does it improve the quantity of air and gas combusting within the cylinder, nevertheless it additionally produces a sooner shifting flame entrance as a result of oxidizer properties of the nitrous oxide. Because of this extra timing retard, nice octane gas, and presumably colder spark plugs will likely be required to run spray on a supercharged automotive. Moreover, due to its cooling impact, a 100hp shot on a supercharged Camaro can very simply put down OVER 120 rear wheel horsepower of extra energy. Because of this the ‘out of the field’ jetting of a nitrous package might not be ample on a supercharged automotive and also you’d have to ensure to observe and presumably improve the gas jetting to match the ultimate horsepower determine of your automotive). Final however not least, should you’re working a 500hp supercharged automotive with a further 120hp of nitrous oxide injection, then you could ensure that your gas supply (gas pump and gas traces) are capable of stream the entire quantity of gas required to delivers 620hp.
Situation functions:
1- You might have a automotive like mine, a 2005 C230 kompressor that comes with a 230hp restricted Eaton MP45. ECU on the automotive is a Siemens ECU that only a few folks know tune, and the gas system makes use of a return-less setup with an in-tank gas strain regulator. With this sort of setup all types of dry nitrous injection are out of the query as a result of we are able to neither compensate for gas by flashing the manufacturing unit ECU, nor can we elevate gas strain in the course of the nitrous injection as a result of the gas strain regulator is in-accessible.. ..
Really helpful package:
A moist nitrous injection package that injects each gas and nitrous oxide from the injection nozzle.
Injection rental:
After the supercharger, after the intercooler, and into the consumption manifold of the automotive.
Most really helpful injection:
25% of the unique whole energy determine which corresponds to round a 50 hp shot of nitrous on our instance.
Anticipated ultimate horsepower:
60 to 65 wheel horsepower and attainable about 130 ft-lbs of extra torque!
2- You might have a automotive that has an accessible gas strain regulator, or an ECU that may be re-flashed for nitrous oxide or a ‘twin tune’ setup. On this case it’s endorsed to make use of a dry nitrous package for 2 causes:
First: Dry kits are safer on supercharged automobiles (so long as the gas supply by the injectors or raised gas strain is ample) as a result of they maintain a decreased likelihood of consumption backfires as a result of the consumption manifold is dry of gas.
Second: Dry nitrous injection incorporates no gas, and so we need not fear about gas falling out of suspension from the injected air. Because of this we not need to spray the nitrous proper earlier than the consumption manifold and we now have the choice to maneuver the purpose of injection a lot farther again. Spraying nitrous BEFORE the intercooler, proper after the supercharger provides the nitrous stream extra time and extra contact with the compressed air popping out of the supercharger which ends up in extra cooling and additional elevated horsepower.
Really helpful package:
A dry nitrous injection package that injects solely nitrous oxide from the injection nozzle.
Injection rental:
After the supercharger, earlier than or after the intercooler and never essentially proper on the consumption manifold of the automotive.
Most really helpful injection:
25% of the unique whole energy determine which corresponds to round a 50 hp shot of nitrous.
Anticipated ultimate horsepower:
70-75 wheel horsepower and attainable about 130 ft-lbs of extra torque!
3- You might have a automotive that has an accessible gas strain regulator, or an ECU that may flashed for nitrous oxide or a ‘twin tune’ setup. You additionally wish to make as a lot horsepower as attainable out of your nitrous…
On this case it’s endorsed to make use of a dry nitrous package injecting earlier than the supercharger. As we talked about in our articles on twin charging (combining turbochargers with superchargers for added efficiency), when two ‘chargers’ are chained in collection the place one charger feeds the following, then the 2 strain ratios of the charger combines as a result of the second charger compresses air that’s already compressed by the primary. For instance two turbochargers set for a 1.5 strain ratio (or 7 psi of enhance), working in sequential mode will end in a ultimate strain ratio of two.25 bar (or 18psi of enhance) which is greater than the ‘anticipated’ 14psi that’s the sum of the 2 enhance ranges.
Equally, injecting nitrous oxide earlier than the supercharger, delivers already compressed air. That is true climate we’re speaking about nitrous being compressed as a result of it has twice the oxygen focus as regular air or we’re speaking in regards to the nitrous cooling and compressing the incoming air. The ultimate quantity of compression noticed by the supercharger inlet will differ relying on the ratio of incoming air to the dimensions of the nitrous shot, and may end up in a rise in enhance of between 0.5 to 2.5 psi!
This enhance improve is along with the facility improve of the nitrous oxide injection and so it may be a further 5 to 25 hp.
Really helpful package:
A dry nitrous injection package that injects solely nitrous oxide from the injection nozzle.
Injection rental:
Earlier than the supercharger inlet.
Most really helpful injection:
25% of the unique whole energy determine which corresponds to round a 50 hp shot of nitrous.
Anticipated ultimate horsepower:
75-100 wheel horsepower and attainable about 160 ft-lbs of extra torque!
Issues to keep away from:
1- Irrespective of the place you setup the nitrous injection, be sure that to not spray nitrous into your MAS air stream sensor or your consumption air temperature sensor. These temperature dependent sensors, inform the ECU to advance the timing in colder situations. As we talked about earlier, nitrous is an oxidizer that will increase the velocity of journey of the combustion occasion and thus requires maintained (if not retarded) ignition timing in comparison with a supercharged solely setup. Keep away from spraying on these temperature delicate sensors to forestall unintended timing advance from occurring.
2- Keep away from spraying a moist package (gas) earlier than your supercharger, because the moist gas mist will injury the supercharger rotors and strip their coatings.
3- Ensure you verify your air gas ratio on the nitrous and do not stick with the ‘out of the field’ air to gas settings with the package. For instance an additional 2.5 psi in your consumption might or might not be compensated by your inventory ECU and so relying on how effectively the ECU reacts you’ll have to modify the gas jetting on the nitrous package.
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