Nitrous tuners - A/F ratio's
03-03-2004, 07:05 AM
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Nitrous tuners - A/F ratio's
When tuning for nitrous, what a/f ratio's will yield the most reliable and largest power gains? I was always under the impression of 12.0:1 - 12.5:1
03-03-2004, 07:14 AM
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Re: Nitrous tuners - A/F ratio's (PrecisionH23a)
Don't go any higher than 12.5:1 on nitrous. I hit a 13.0:1 on the onset of the nitrous. It was too lean and I blew the headgasket and melted a plug on a 100 shot.
03-03-2004, 01:56 PM
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Re: Nitrous tuners - A/F ratio's (PrecisionH23a)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a »</TD></TR><TR><TD CLASS="quote">So what would you say to someone who runs a 9.7:1 afr with a 50 shot?</TD></TR></TABLE>
A little too much fuel, but what was the set-up? It sounds like a wet kit, but who knows.
A little too much fuel, but what was the set-up? It sounds like a wet kit, but who knows.
03-03-2004, 02:16 PM
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Re: Nitrous tuners - A/F ratio's (turbogixxer)
i was always under the impression that the stoichiometric ratio for nitrous/fuel:air was about 1:9 or so.. so a safe tune would be around there... any chemist out there come on? figure out the mole ratio for fuel and N2O against O2. if i am not mistaken i believe this is correct.
Ed-
Ed-
03-03-2004, 05:45 PM
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Re: Nitrous tuners - A/F ratio's (RyanCivic2000)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 »</TD></TR><TR><TD CLASS="quote">9:1 is way too rich.</TD></TR></TABLE>
if it was only fuel and O2 it would be.
but its fuel/N2O and O2. the stoichiometric mole ratio will be different once both those nitrogen and that extra oxigen molecules are added. again i am not exactly sure if i wrote the exact ratio but it is somewhere around there if i am not mistaken.
Ed-
if it was only fuel and O2 it would be.
but its fuel/N2O and O2. the stoichiometric mole ratio will be different once both those nitrogen and that extra oxigen molecules are added. again i am not exactly sure if i wrote the exact ratio but it is somewhere around there if i am not mistaken.
Ed-
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03-03-2004, 07:44 PM
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Re: Nitrous tuners - A/F ratio's (Kataku2K3)
Ok... I have done some research and yes the chemically correct nitrous to gasoline ratio is said to be 9.649:1. Nice copy and paste work 
But that is nitrous to gasoline ratio, not air to fuel ratio. You completely overlooked that part of my question.
So... reguardless of the type of shot (wet/dry) and the amount of the shot, the nitrous to gasoline ratio will ALWAYS be 9.649:1?
If so, using basic chemistry then I can see how you would encorperate this into the 14.7:1 a/f ratio and calculate a 'stoich' af ratio for gasoline powered motors that use nitrous...
Not like this **** matters though since we already know what to tune the motor for.
But that is nitrous to gasoline ratio, not air to fuel ratio. You completely overlooked that part of my question.
So... reguardless of the type of shot (wet/dry) and the amount of the shot, the nitrous to gasoline ratio will ALWAYS be 9.649:1?
If so, using basic chemistry then I can see how you would encorperate this into the 14.7:1 a/f ratio and calculate a 'stoich' af ratio for gasoline powered motors that use nitrous...
Not like this **** matters though since we already know what to tune the motor for.
03-03-2004, 08:39 PM
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Re: Nitrous tuners - A/F ratio's (ModenaTwinTurbo)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ModenaTwinTurbo »</TD></TR><TR><TD CLASS="quote">
if it was only fuel and O2 it would be.
but its fuel/N2O and O2. the stoichiometric mole ratio will be different once both those nitrogen and that extra oxigen molecules are added. again i am not exactly sure if i wrote the exact ratio but it is somewhere around there if i am not mistaken.
Ed-</TD></TR></TABLE>
That is nitrous to fuel ratio. We are talking about air/fuel ratios which are best measured with a wideband o2. You are right about the 9:1 nitrous to fuel ratio, but air/fuel is different.
if it was only fuel and O2 it would be.
but its fuel/N2O and O2. the stoichiometric mole ratio will be different once both those nitrogen and that extra oxigen molecules are added. again i am not exactly sure if i wrote the exact ratio but it is somewhere around there if i am not mistaken.
Ed-</TD></TR></TABLE>
That is nitrous to fuel ratio. We are talking about air/fuel ratios which are best measured with a wideband o2. You are right about the 9:1 nitrous to fuel ratio, but air/fuel is different.
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