IPD sale Volvo Parts
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy your stuff using this and it helps MVS!

Nitrous: Pray or Spray? FF#26!

How to go faster, stop quicker, and turn harder. Chips, exhaust, larger turbos, bigger/slotted/drilled rotors, high performance brake pads, manual boost controllers, performance shocks/struts/springs, airbox mods and more! Also discussion on HID and Xenon lights, aftermarket foglights and other exterior lighting.
User avatar
matthew1
Site Admin
Posts: 9721
Joined: Sat Sep 14, 2002 11:03 am
Year and Model: 850 T5, 1997
Location: Denver, Colorado, US
Has thanked: 341 times
Been thanked: 129 times
United States of America
matthew1

Volvo Repair Database Nitrous: Pray or Spray? FF#26!

Post by matthew1 » Fri Jan 11, 2013 5:07 pm

Image

Missed last week? Autotragic to Manual Magic!. Take the Fast Friday Poll.

Nitrous: Pray or Spray?
Nitrous oxide systems have been a part of the performance scene for many years now, but thanks (or no
thanks) to the Fast & Furious franchise this staple of hot rod performance and power has been glorified
to mythical status and as such has become the subject of some misunderstanding and ill-conceived
information. So for this week’s article let’s delve into the realm of N2O!

Let's Cut to the Oxygen
To begin we should have a good understanding of the main component in question, oxygen. Oxygen in
the atmosphere only makes up about 23% (measured by mass) of the total components of the air we
breathe but is effectively the only component within the atmospheric air mix that does an engine any
good. Oxygen provides the necessary oxidizer for fuel to combust and burn. Without it a fire would go
out, such as with the use of a fire extinguisher where the effect is flooding the area to remove oxygen
and put out the fire. The same is done with welding gas on MIG and TIG welders to flood the area of the
weld and prevent oxygen from oxidizing the molten hot bead. An oxidizer can be simply defined as any
chemical necessary for a combustable to burn or chemically react.

Image

Introducing... 50% More O2!
Nitrous oxide does effectively the same thing as a turbocharger or super charger, in fact it’s so similar
that it’s been referred to as chemical charging in the past. The similarity between nitrous oxide and
forced air induction is that both methods work to increase the oxygen capacity of the cylinder. However
nitrous oxide does this in a different way entirely. While turbo chargers and super chargers force
more air into the cylinder increasing total mass of oxygen, nitrous utilizes the very nature of its higher
chemical density of oxygen from the start. Unlike atmospheric air that is 23% Oxygen, nitrous Oxide
(chemically shown as N20) has 36% oxygen by weight. By injecting this into the air intake stream we can
increase the cylinder oxygen mass. Additionally since the N2O is stored under pressure in the bottle as a
liquid and sprayed into the motor as a gas, the state change from liquid to gas absorbs considerable heat
energy which is very desirable to further cool the atmospheric air entering the engine as well and reduce
cylinder temps.

The Simple Way
Nitrous in and of itself is not flammable, explosive, or unstable. Only when fuel is added to it can
it provide the gains we see glorified in so many movies. Just like the normal air fuel mix, nitrous
injected must have a matching fuel mass to maintain the ideal air fuel ratio. In ‘wet’ nitrous systems an
additional nozzle is attached to the fuel rail to then join the injected nitrous oxide into the intake tract.
This provides the added oxygen and fuel in a proper mix to increase power. ‘Dry’ nitrous systems do not
add this fuel by virtue of an additional fuel nozzle but instead rely on engine management to add the
additional fuel. This can be done by either a trigger input to the EMS to add fuel based on the quantity
of nitrous injected or in many ‘homebrew’ methods the nitrous is injected ahead of the MAF sensor so
that the MAF can detect the added oxygen and consequently add appropriate fuel. Unfortunately this
later method tends to be less precise, although since it is less costly and easier to install it’s becoming
more common to see it in the aftermarket.

Top, Bottom, & Longetivity
Proper use of nitrous depends on the application in question but commonly you’ll find more moderately
built engines use nitrous on the top end to help maintain power where a smaller turbo might start to
fall out of efficiency. For larger, more aggressive engine builds with larger turbo chargers, nitrous can be
used to help offset the lag that a larger turbo charger generally creates. Either way the added cylinder
pressure
is something that should be considered regardless of engine type and build so that engine
longevity can be maintained.

Kits Rated by HP
Nitrous kits are typically rated by the horsepower they provide to the engine and you’ll see them
marketed as “50 shot” or “100 shot” which again is the measure of the BHP increase you’re likely to
see. Refilling nitrous tanks can be fairly cost effective depending on where you are but per pound will
run between $5.00- $7.00. Tank size can vary and amount of nitrous used per spray depends on you as
a driver so refill intervals will vary wildly from one person to another. Lately more convenience features
have been offered such as remote bottle opening via electric motor as well as bottle heaters to keep the
N2O from getting too cold during prolonged use and reducing cylinder pressure. These added features
help to keep nitrous as a useful and easy to operate performance product.

Further questions??? Post up in the comments!

Robert Lucky Arnold
ARDtuning.com

~ ~ ~
  • Questions, comments, arguments and freakouts accepted and encouraged. Really. Lucky WANTS to answer your questions.
  • If you want to remain anonymous, email me your question or comment and I will post it as "Anonymous User".
  • It takes Lucky and me several hours combined to bring you Fast Fridays. Your questions and comments validate FF's value.
  • I write paragraph headlines, and sometimes article headlines. Yell at me if you find these not to your taste.
  • Same thing with italics and bolds , they're all mine.
  • Cams and turbos and MBCs and chips and... whoo!
Matt[/size]


Help keep MVS on the web -> click sponsors' links here on MVS when you buy from them.
Also -> Amazon link
. Click that when you go to buy something on Amazon and MVS gets a kickback.

1997 850 T5, MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace [gone]
2004 V70 R [gone]

boosted5cyl
Posts: 1100
Joined: Fri Jan 29, 2010 12:52 pm
Year and Model: '98 V70 T5, '99 S80
Location: St. Paul, MN
Has thanked: 0
Been thanked: 0
boosted5cyl

Re: Nitrous: Pray or Spray? FF#26!

Post by boosted5cyl » Sun Jan 13, 2013 11:18 am

Nitrous with methanol as a fuel can be a great way to build power if you are sensible about it. There are lots of jetting calculators about where you can work out the jet size you need based on your system pressure and the desired/required HP boost that you want. Start small :)
I've heard of people using washer fluid as a fuel, but I'd be cautious there unless you know what the exact methanol content it is, running rich on the methanol wont hurt it, but lean of course will!


'04 XC90 2.5T AWD (Angus) 134K.
'99 S80 T6 (Medusa) 214k. On borrowed time LOL
'98 V70 T5 (Vivienne). RIP @ 228K. Spun rod bearings.

ARD-Lucky
Posts: 92
Joined: Fri Sep 02, 2011 3:43 pm
Year and Model: 1994
Location: Portland OR
Has thanked: 0
Been thanked: 0
ARD-Lucky

Re: Nitrous: Pray or Spray? FF#26!

Post by ARD-Lucky » Mon Jan 14, 2013 9:03 am

Agreed, always wise to start small and move up. I'm not sure I've seen washer fluid with high enough methonal content to be used outside of water/meth injection but if you can source it with high enough mix then it should work I would think!



Post Reply