Nitrous jets/ratios
#1
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Right, bought my nitrous system second hand and looking to replace the jets for bigger ones to give 75bhp.
Here is the ratios Ive been given:
However are these correct of every nitrous kit (with the same fuel pressure and nitrous pressure)?
I ask as the jets that came out of the kit were .022 Nitrous jets and .018 fuel jets, which seem off ratio. I assume thats due to the particualr car they on beforehand but just want to check. It is a direct port fogger kit.
Cheers
Here is the ratios Ive been given:
20 BHP Nitrous jet .021 Fuel jet .012
30 BHP Nitrous jet .026 Fuel jet .015
40 BHP Nitrous jet .030 Fuel jet .018
50 BHP Nitrous jet .033 Fuel jet .020
75 BHP Nitrous jet .041 Fuel jet .024
100 BHP Nitrous jet .047 Fuel jet .028
30 BHP Nitrous jet .026 Fuel jet .015
40 BHP Nitrous jet .030 Fuel jet .018
50 BHP Nitrous jet .033 Fuel jet .020
75 BHP Nitrous jet .041 Fuel jet .024
100 BHP Nitrous jet .047 Fuel jet .028
However are these correct of every nitrous kit (with the same fuel pressure and nitrous pressure)?
I ask as the jets that came out of the kit were .022 Nitrous jets and .018 fuel jets, which seem off ratio. I assume thats due to the particualr car they on beforehand but just want to check. It is a direct port fogger kit.
Cheers
#2
Too many posts.. I need a life!!
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to be on the safer(ish) side i would put the slightly bigger fuel jet in
ie .003 nos jet and .024 fuel jet keep plenty of fuel there as the other way round you are looking at new pistons!
i had this prob on my old bmw e30 to the point of it pissing out black smoke as it had the biggest fuel jet in as the inlet track was long and i was getting det when i was using the kits data ratios.
ie .003 nos jet and .024 fuel jet keep plenty of fuel there as the other way round you are looking at new pistons!
i had this prob on my old bmw e30 to the point of it pissing out black smoke as it had the biggest fuel jet in as the inlet track was long and i was getting det when i was using the kits data ratios.
#3
It Wasnt Me!
![Default](https://passionford.com/forum/images/icons/icon1.gif)
Nitrous is a pain..
need to chill the bottle to fuck to get it full when filling, need to heat it with a bottle warmer to keep the pressure up when using, runs out often....blah blah
need to chill the bottle to fuck to get it full when filling, need to heat it with a bottle warmer to keep the pressure up when using, runs out often....blah blah
#5
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to be on the safer(ish) side i would put the slightly bigger fuel jet in
ie .003 nos jet and .024 fuel jet keep plenty of fuel there as the other way round you are looking at new pistons!
i had this prob on my old bmw e30 to the point of it pissing out black smoke as it had the biggest fuel jet in as the inlet track was long and i was getting det when i was using the kits data ratios.
ie .003 nos jet and .024 fuel jet keep plenty of fuel there as the other way round you are looking at new pistons!
i had this prob on my old bmw e30 to the point of it pissing out black smoke as it had the biggest fuel jet in as the inlet track was long and i was getting det when i was using the kits data ratios.
#6
PassionFord Post Whore!!
#7
Happily retired
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Not so
I run direct port & 1 Nitrous & 1 Petrol jet at the Pulsoids. The injectors at the ports are all the same.
Ratio is about 3:1 to be safe, I use 4:1 cos thats where it makes most Power but unless your car is mapped with the gas its safer to run 3:1 or even 2:1 is recommended by the manufacturer, who dosnt want engine blow ups every week with people just fitting & squirting.
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#8
PassionFord Post Whore!!
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Not so
I run direct port & 1 Nitrous & 1 Petrol jet at the Pulsoids. The injectors at the ports are all the same.
Ratio is about 3:1 to be safe, I use 4:1 cos thats where it makes most Power but unless your car is mapped with the gas its safer to run 3:1 or even 2:1 is recommended by the manufacturer, who dosnt want engine blow ups every week with people just fitting & squirting.
I run direct port & 1 Nitrous & 1 Petrol jet at the Pulsoids. The injectors at the ports are all the same.
Ratio is about 3:1 to be safe, I use 4:1 cos thats where it makes most Power but unless your car is mapped with the gas its safer to run 3:1 or even 2:1 is recommended by the manufacturer, who dosnt want engine blow ups every week with people just fitting & squirting.
#10
*** Sierra RS Custard ***
iTrader: (3)
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What fuel pressure are you running?
For some applications the nitrous jet actually needs to be smaller than the fuel jet.
When rod/tib refers to 2 or 3 times etc they are talking cross sectional area, not diameter, so you need to square the radius before applying that rule, as the jets they use are measured based on flow not diameter and flow is more or less directly related to the square of the diameter
(i say more or less, as velocity is included too and if the jet size get close to the pipe diameter you can see a velocity drop which results in slightly less flow, this wont be an issue at your level though)
For some applications the nitrous jet actually needs to be smaller than the fuel jet.
When rod/tib refers to 2 or 3 times etc they are talking cross sectional area, not diameter, so you need to square the radius before applying that rule, as the jets they use are measured based on flow not diameter and flow is more or less directly related to the square of the diameter
(i say more or less, as velocity is included too and if the jet size get close to the pipe diameter you can see a velocity drop which results in slightly less flow, this wont be an issue at your level though)
Last edited by Chip; 26-11-2009 at 12:07 AM.
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