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Direct Port Jetting Size

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Old 12-12-2015, 10:20 AM
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Default Direct Port Jetting Size

Given that the stock fuel pressure on a 4th gen fbody is 58ish... On the chart the fuel jet is "N/A"... Does this mean i dont need a jet or that i have to either:
A. Run a 200 shot
Or
B. Use a fuel pressure regulator and jet accorrdingly.

Input and sound advice are always appreciated!




Jetting
Old 12-12-2015, 11:08 AM
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This would be a great question in the Nitrous section...
Old 12-12-2015, 11:12 AM
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Originally Posted by KCS
This would be a great question in the Nitrous section...

Sorry bout that, thanks for the move.
Old 12-12-2015, 11:51 AM
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I would call one of the chaps over at Nitrous Express...
Old 12-12-2015, 05:02 PM
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The 100 shot probably calls for a jet smaller than .009 and no one makes one.


Holy overkill on a direct port for a 100 shot...
Old 12-12-2015, 05:11 PM
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Yeah you may be to small I think even at 200 I was told it's better to run low pressure because the risk of something getting stuck in the jet is higher with such a small opening.
Old 12-13-2015, 06:28 PM
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U need to run 55-60PSI jetting chart for stock fuel pressure 4 generation
for 200 shot for nitrous 26 and fuel 14

for 100 shot for nitrous 20 and fuel Not Available it's best to contact NX to give you the jet size , N/A in the chart doesn't means without jets , Because it will runs too much rich .
Old 12-14-2015, 12:54 PM
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A 100hp shot on the direct port fuel side will be a 10jet which is an extremely small jet hence that's why is was left as n/a.

Just in case you wanted something in between the 150hp shot would be 24-N20 / 12-Fuel

-Chris
Old 12-15-2015, 11:33 AM
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If you want to run a lower HP jet on a Direct Port, I recommend dropping the fuel pressure so you can run a larger fuel jet. You can do so by either using an independent fuel pressure regulator or going to a dedicated fuel system. If you go with a dedicated you'll get the added bonus of being able to run higher octane fuel when spraying-
Old 12-22-2015, 05:44 PM
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Originally Posted by NitrousExpress
A 100hp shot on the direct port fuel side will be a 10jet which is an extremely small jet hence that's why is was left as n/a.

Just in case you wanted something in between the 150hp shot would be 24-N20 / 12-Fuel

-Chris
Thanks for the info!!!

If I were to run a fuel pressure regulator, and wanted the 150 shot at 5psi, what would be the correct jets?
Old 12-23-2015, 10:10 AM
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It would be something like this. 150hp: 24-N20 / 21- Fuel@5psi

Might even get away with a 20jet on the fuel side but i'd start with the 21 and see how it looks via the plug.




Chris
Old 12-23-2015, 12:09 PM
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Originally Posted by NitrousExpress
It would be something like this. 150hp: 24-N20 / 21- Fuel@5psi

Might even get away with a 20jet on the fuel side but i'd start with the 21 and see how it looks via the plug.




Chris
Chris - I called to speak with you, but I was able to talk with Garret...

Thank you guys so much for the awesome feedback and the knowledge gained during our 5-10 minutes phone call was priceless. And saved me about 100 bucks! You have definitely gained a repeat customer!

I haven't been able to locate a 'Vendor Feedback' section on this forum yet, but if I do I will be sure to share my experience...

Customer service at its best!

Last edited by 08RWDTBSS; 12-23-2015 at 12:10 PM. Reason: Additional text
Old 12-23-2015, 12:18 PM
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It was also good talking to you on the phone! Definitely glad he got you covered...

-Chris



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