Nitrous on a 340 100 shot

[nfhDODGEnfh]

I'm planning on adding a 100 shot of nitrous to my street car. Its a 69 dart 340 and has a mild cam, intake, headers and msd ignition. I'll be tossing out the mechanical fuel pump for an electric one that is 7psi and can handle 60gph at that rating. Looking for any input if that will be enough constant fuel supply for my needs? (It's all 3/8 fuel line) Plan on using a 100 micron pre filter and a 10 micron post filter then teeing off the fuel line and hooking it to the solenoid. They are both earls reusable filters and should handle the gph. Another question I have is about the spark plugs, do I need to get colder plugs when I'm just spraying 100 shot? If so how much colder and do I need to change the Gap? Seems like I could just throw it on and things would be fine, any advice would be greatly appreciated. I'm just looking to get a bit more thrill when I stab the throttle.

 

[a-bodyguy]

For a 100 shot you could proabally just throw it on and be fine
Whats your total timming ?
You wanted it tuned to 9th degree before you spray it
You want a saftey so if the gas solenoid does not open the spray solenoid doesn't spray
Low fuel pressure saftey wouldn't be a bad idea
stock plugs and gap should be fine foe 100 hp
I would start 2 degrees retard from best tune on pump gas read the plugs
Race fuel you dont need to retard timming but i would to start
Less is more sneak up on where you want to be
You will love the thrill best part is its only on when you want

 

[nfhDODGEnfh]

For a 100 shot you could proabally just throw it on and be fine
Whats your total timming ?
You wanted it tuned to 9th degree before you spray it
You want a saftey so if the gas solenoid does not open the spray solenoid doesn't spray
Low fuel pressure saftey wouldn't be a bad idea
stock plugs and gap should be fine foe 100 hp
I would start 2 degrees retard from best tune on pump gas read the plugs
Race fuel you dont need to retard timming but i would to start
Less is more sneak up on where you want to be
You will love the thrill best part is its only on when you want

I will wire both solenoids to the same relay so they work in tandem. Currently I'm at 35 degrees timing and it runs pretty dang good. Are you supposed to pull 4 degrees for 100 shot? That was my plan anyways to dial it back to 31* when I have the bottle on. I'll just make a refence mark so I can switch between them somewhat simply

 

[a-bodyguy]

I will wire both solenoids to the same relay so they work in tandem. Currently I'm at 35 degrees timing and it runs pretty dang good. Are you supposed to pull 4 degrees for 100 shot? That was my plan anyways to dial it back to 31* when I have the bottle on. I'll just make a refence mark so I can switch between them somewhat simply

I would start@2 degrees on 94 pump sneak up on it
Many moons ago i had the nitrous solenoid fail to open it bogged as it still got the gas i had no safeguards young and foolish
Even wired to the same relay the can still stick
no gas no spray

 

[nfhDODGEnfh]

I would start@2 degrees on 94 pump sneak up on it
Many moons ago i had the nitrous solenoid fail to open it bogged as it still got the gas i had no safeguards young and foolish
Even wired to the same relay the can still stick
no gas no spray

What is your recommend solution for ensuring the solenoids both work?

 

[crackedback]

If you run 7 psi fuel to the solenoid, the likelyhood of the tune up for juice will be horribly FAT. That is not a good approach. Fat kills parts too.

 

[nfhDODGEnfh]

If you run 7 psi fuel to the solenoid, the likelyhood of the tune up for juice will be horribly FAT. That is not a good approach. Fat kills parts too.

 

[nfhDODGEnfh]

7psi is the maximum pump output. What would you recommend then? If 7 is too fat and will break parts. Regulating it down to 5 at the solenoid? I'm asking questions because I'm learning about nitrous and looking for advice

 

[crackedback]

What kit? Look at the instructions would be my first suggestion. There will be recommendations on fuel pressure and jet sizing.

Just a baseline to consider from running this stuff off and on for 40 years. If the fuel jet is larger than the nitrous jet, it's most likely a FAT tuneup. It can be cleaned up a lot.

An AFR meter helps a lot. Have the tune up on the engine great, then add juice. Tune juice to the same non juice max MPH AFR if running at the track. Runs best MPH at 12.2 on motor, run the juice at 12.2 as well.

 

[nfhDODGEnfh]

It would be a 100 shot of nitrous from a nitrous express kit ML1000, I assume they will tell me what jets to use for the 100 shot as it's the lowest setting on the kit and the one i would use. The fuel pump in question could be regulated down easily if that's necessary. I have never run nitrous before and am considering it. Just looking for suggestions and info from people who may have already done this or experience as I have not yet. I never considered 7psi being way to FAT as most carbs are good for 5-7 psi. I figured it would be right around perfect to just drop it on and try. Did you have a starting point suggestion for regulated fuel pressure at the solenoid? Wpuld you regulate the whole carb down aswell or just the solenoid? I plan on giving it a try and watching the spark plugs to see how it reacts.

 

[crackedback]

It would be a 100 shot of nitrous from a nitrous express kit ML1000, I assume they will tell me what jets to use for the 100 shot as it's the lowest setting on the kit and the one i would use. The fuel pump in question could be regulated down easily if that's necessary. I have never run nitrous before and am considering it. Just looking for suggestions and info from people who may have already done this or experience as I have not yet. I never considered 7psi being way to FAT as most carbs are good for 5-7 psi. I figured it would be right around perfect to just drop it on and try. Did you have a starting point suggestion for regulated fuel pressure at the solenoid? Wpuld you regulate the whole carb down aswell or just the solenoid? I plan on giving it a try and watching the spark plugs to see how it reacts.

Not close to what was written. My comments ONLY have to do with the juice kit. The carb may be just fine at 7 psi. Most juice kits I messed with were in the 5-6 range.

If you don't have the kit and instructions, you are asking questions that are in those instructions. There will be a tune up. A regulator on the fuel side of your kit will likely be necessary. I bet the instructions are online. Simple enough to see what is suggested.

 

[nfhDODGEnfh]

Not close to what was written. My comments ONLY have to do with the juice kit. The carb may be just fine at 7 psi.

If you don't have the kit and instructions, you are asking questions that are in those instructions. There will be a tune up. A regulator on the fuel side of your kit will likely be necessary. I bet the instructions are online. Simple enough to see what is suggested.

Thanks for your advice and input I'll download the installation instructions and see what they say.

 

[crackedback]

Was shooting the **** with a friend that runs a bunch of NE stuff. They usually want around 8 psi, so your fuel pump isn't going to cut it from the suppliers perspective.

 

[nfhDODGEnfh]

Was shooting the **** with a friend that runs a bunch of NE stuff. They usually want around 8 psi, so your fuel pump isn't going to cut it from the suppliers perspective.

Thanks! Yeah I read that in the instructions after I downloaded them on your advice. So I'll get a pump that can go to 10psi as that's what the 250 shot requires and the 100 does need 8. I'll also get a fuel pressure switch to run in an sttempt to safety the system somewhat.

 

[a-bodyguy]

6 to 6.5 psi is about what it should be with the solenoid open running