Ok I have a Few Questions For the Nitrous/EFI Guru's


Ok Say Someone was running a Fuel Injected Engine Built For Nitrous. Now It was Running a HSR and 30lbs SVO's, and this same person wanted to Inject 200 Shot of Nitrous Through a Single Nitrous/Fuel Nozzle That Is Plumbed Before the Throttle Body. Tapping into the Existing Fuel Rail Won't Support Much More Than 125 shot so They Wanted to go with a Dedicated Fule System for the nitrous system.

The System Would be set up like This

ok I know that the Fule Pressur Regulator For the Injectors Has A Vaccum Refernce Port to help keep the Fuel Pressure consistant. Now Would the Fuel Pressure Regulator for the Nitrous System Would also Need to have the Vaccum Port, Correct Using a Regulator Like This Would Be Good YES

Aeromotives #13109

 

Why not just tap into the existing fuel system and use a low fuel pressure cutoff switch. Its easy and safe.

Using the last method with serperate regulators you dont technically need a vacuum line for the nitrous regulator. The only thing the vacuum sorce does is raise fuel pressure for enrichment under high load. You could get away with setting the regulator for nitrous by the mechanical spring in the regulator because you would only be using the nitrous at full throttle.

 

The vacuum port on the regulator is irrelevant for N2O… you should only be spraying with the throttle blades open so there will be no vacuum to change the fuel pressure.

Assuming that your fuel pump is sufficient, you could run much more then a 125hp shot off of the fuel rail. Really, as long as you’re supplying enough fuel to the fuel rails to feed the HP you’re making with the N2O, this is fine. The stock fuel pump won’t do it (I’m not sure that the stock TPI pump will do 125hp reliably, but I’ve done 200 with the stock FP on an LT1 using the pressure port on the rail), but upgrade it to a 255l/h or add an inline and you should be OK to somewhere close to the 700hp range.

If you want to run a separate fuel system your diagram is fine, but I woudn’t waste my money unless we were talking about something that is making >500hp na with and then >300hp N2O shot, or more then about 700hp total.

 

Thank You Both For Your Replies.

I am just doing Research, I was wanting a Dedicated Fuel System for these Reason.

1. I could Do WOT Runs with a WIDE BAND 02 And Adjust the Fuel Pressure With the ADjustable Regulator To Dial In the Correct AFR.
2. Because to Make Sure I don't Put Too Much Strain On the Main Fuel Pump or Take Fuel Away From The Injectors.

Today I Finally Recived a Replay Form [nitrous oxide systems][/b] and Nitrous Express on this same Question. Both The Tech's Replied That A Vaccum Refferenced Regulator Isn't Specifficall Needed but Were Recommended Because the Engine WIll Pull different amounts of Vaccum With Load and RPM. So I see it as A Tuning Tool.

Now 83 Crossfire TA When You Sprayed a 200 Shot, Was that using a Singe Nozzle or Plate or did you Have indiidual Nozzles Per Cylinder.

BTW Thanks for the Replys.

 

In response to your two points of concern.

1-If you get a wet system you will get a recomended jet size for optimum af ratio. Start out rich and lean it out. Youll lose power/time before you do serious engine damage.

2-Thats the reason for the low fuel pressure cutoff. Most likly your stock pump is plenty to supply both systems but just in case the pressure drops you have a safty to protect you engine.

 

N2O systems are jetted for roughly a 6:1 AFR from the factory. Even if you dropped your base fuel pressure 20% it would not significantly effect your fuel delivery when spraying.

No one ever does this, but you can usually run a much smaller jet then what they recommend and make much more power, as long as you’re willing to do a little tuning/experimenting.

But as far as your deal goes, if you just stay with the recommended jets messing with your fuel pressure a few lbs either way will make no difference.

Your call, just size the pump for what you need total and be done with it… or even run your second pump and feed it into the same fuel rails so that you only have to use one regulator.

NX Shark nozzle that came with a NX GenX kit… I think it’s good for up to 250 or 300hp.