Do these jet sizes look correct?
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Joined: Jan 2004
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From: Letart,WV
Do these jet sizes look correct?
I found this on another site and I wanted to be sure. This is for a Nos brand EFI single nozzle. I have emailed Nos and am waiting for a reply.
I have an old style tpi kit with two nozzles on each side of the plate. So for a 140 hp shot would I be jetting the nozzles for 70 on each side?
I was told I need to divide them up like this. I would like to only go 100hp but I can't find the jet sizes anywhere for 50 hp.
NOS EFI Single Fogger Nozzle Wet
HP Level Nitrous Fuel@42+ psi
70 .042 .026
100 .047 .030
125 .055 .039
I have an old style tpi kit with two nozzles on each side of the plate. So for a 140 hp shot would I be jetting the nozzles for 70 on each side?
I was told I need to divide them up like this. I would like to only go 100hp but I can't find the jet sizes anywhere for 50 hp.
NOS EFI Single Fogger Nozzle Wet
HP Level Nitrous Fuel@42+ psi
70 .042 .026
100 .047 .030
125 .055 .039
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From: Central Illiniois
Car: 89 Formula 350
Engine: 409 nitrous' small block
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From: DC Metro Area
Car: 87TA 87Form 71Mach1 93FleetWB 04Cum
Metering jets are pretty much the same across the board. It doesn't make a difference what parts you're using for the rest of the N2O system, as long as the parts flow more then the jets the jet size determines the power (in other words, find any complete chart at the FP that your using and it should be about right for your setup)
That being said, the N2O jets that you have listed look a little big for the power level, and the fuel jets are huge in comparison to the N2O jets. For example, your 55 N2O should only need about a 30 or 31 on the fuel side and should be good for at least 135hp (OTOH, adding more fuel with the same size N2O jet will just result in the engine running even richer, hurting power, so I suppose that you may end up with something in the 120-125hp range with those jets).
That being said, the N2O jets that you have listed look a little big for the power level, and the fuel jets are huge in comparison to the N2O jets. For example, your 55 N2O should only need about a 30 or 31 on the fuel side and should be good for at least 135hp (OTOH, adding more fuel with the same size N2O jet will just result in the engine running even richer, hurting power, so I suppose that you may end up with something in the 120-125hp range with those jets).
Thread Starter
Junior Member
Joined: Jan 2004
Posts: 18
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From: Letart,WV
Thanks for the replies. Especially that calculator. That is very handy to have.
Nos replied to me. I guess it Does have to be jetted for half the horsepower level on each side. I'll have to experiment to see what works best. I need a rich/lean indicator so I can step down on the fuel jets as needed for more power.
Hello,
this will be the jets based on two nozzles and 35-40psi of fuel
pressure. 80 100 120 140 160 HP 34/18 37/22 39/24 41/26 43/28 nos/fuel.
This system is the same as a universal wet kit with a extra nozzle.
Thanks
Shane Whitescarver
Holley Technical
Service Representative
Nos replied to me. I guess it Does have to be jetted for half the horsepower level on each side. I'll have to experiment to see what works best. I need a rich/lean indicator so I can step down on the fuel jets as needed for more power.
Hello,
this will be the jets based on two nozzles and 35-40psi of fuel
pressure. 80 100 120 140 160 HP 34/18 37/22 39/24 41/26 43/28 nos/fuel.
This system is the same as a universal wet kit with a extra nozzle.
Thanks
Shane Whitescarver
Holley Technical
Service Representative
Last edited by Jerry Bushman; Apr 5, 2004 at 11:34 AM.
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