Nitrous jet sizes for direct port
Thread Starter
Joined: Jan 2005
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From: Nowhere, AL
Nitrous jet sizes for direct port
I'm assembling a direct port nitrous system from components, and have a jet sizing question.
With a NOS Fogger 2 nozzle on each intake runner, what size fuel and nitrous jets should I use to get a relatively small shot, like 60 or so? A table of sizes to use to get proper ratios and power levels would be appreciated as well.
I plan on scaling it up a good bit, but want to start out small
With a NOS Fogger 2 nozzle on each intake runner, what size fuel and nitrous jets should I use to get a relatively small shot, like 60 or so? A table of sizes to use to get proper ratios and power levels would be appreciated as well.
I plan on scaling it up a good bit, but want to start out small
space cadet
Joined: Nov 2002
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From: Spec Shakesland
Re: (AzCivic1.6)
you can go lower then a 75, but its not smart. the jets are so small that they can become clogged quite easily. one bad tank of gas and bye bye cylinder 
i used this, but calling Holly will work as well. you best bet is to have a lot of jets. it will help properly tune it.
http://www.robietherobot.com/N...r.htm
i used this, but calling Holly will work as well. you best bet is to have a lot of jets. it will help properly tune it.
http://www.robietherobot.com/N...r.htm
Thread Starter
Joined: Jan 2005
Posts: 43
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From: Nowhere, AL
Re: (Shakes)
I plan on running a secondary fuel filter right before the fuel solenoid to help mitigate this, but you are right, it could be an issue.
Thanks for the calculator, that's exactly what I was looking for!
Thanks for the calculator, that's exactly what I was looking for!
space cadet
Joined: Nov 2002
Posts: 6,091
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From: Spec Shakesland
Re: (sleeper95Lude)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sleeper95Lude »</TD></TR><TR><TD CLASS="quote">I plan on running a secondary fuel filter right before the fuel solenoid to help mitigate this, but you are right, it could be an issue.
Thanks for the calculator, that's exactly what I was looking for!</TD></TR></TABLE>
your best bet is to run an independant fuel system for the nitrous. then you can always have race gas for the spray. but thats getting into money.
Thanks for the calculator, that's exactly what I was looking for!</TD></TR></TABLE>
your best bet is to run an independant fuel system for the nitrous. then you can always have race gas for the spray. but thats getting into money.
Thread Starter
Joined: Jan 2005
Posts: 43
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From: Nowhere, AL
Re: (Shakes)
Yeah, can't really afford that right now, but it's a great idea.
For reference, in case anybody wants to know, Holley recommends the following sizes for a 4 cylinder direct port nitrous system, spraying a 75 shot at 45PSI of fuel pressure, using the Fogger 2 nozzle.
Nitrous - .022
Fuel - .014
This jives quite nicely with what the calculator listed above shows. The calculator recommends a slightly smaller fuel jet (.012) though.
For reference, in case anybody wants to know, Holley recommends the following sizes for a 4 cylinder direct port nitrous system, spraying a 75 shot at 45PSI of fuel pressure, using the Fogger 2 nozzle.
Nitrous - .022
Fuel - .014
This jives quite nicely with what the calculator listed above shows. The calculator recommends a slightly smaller fuel jet (.012) though.
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