i switched over to a duel nozzle setup and did the calculations for the jets. can someone double check me cause im having some richness issues.

02 ss, 347
standalone at 7psi, was at 10 psi 110 octane
SD tune 12.7 from 2500 to 7000 NA
52 nitrous jets (2) 46 fuel (2) nozzles are both 6 inches from throttle body and at 11 oclock and 1 oclock on the intake pipe.

wide band reads 8.5/1 AFR,

are my fuel jets off? doing the math 46 was what duel nozzles called for

 

anybody

 

I would check with the manufacture and see what jets they rec to start off with, and what bottle pressure they use. Yea, way rich. You can also play with the fuel pressure, but should be closer from the get go. Try some smaller fuel jets and/or bigger n2o jets?
Robert

 

thanks robert, i was wondering when you split up your shots from the main line what jets gave you 250 rwhp. was it 62 and a 62 or another combo. im running 52 nitrous jets and i think thats a 200 fwhp?

 

yea the dual 52's are 200 flywheel with 950psi bottle pressure, or about 170rwhp.
Dual 60's are about 240flywheel and 204rwhp using the 950psi. These will vary depending on psi and a/f.
IIRC correctly the 60's I used were my 1st stg on the 285rwhp shot that I blew my engine with, and had them at 1050psi (car is at shop and I still need to confirm my hit size as I had drilled out my jets with numbered bits in parking lot prior to dyno).
Robert

 

i have duel 73s ready to go in, im runnign a standalone do you think that is too big of a shot? i have a wideband and hptuner to check and a fjo controller but is it just too big. if too big could i up the jets in one nozzle instead of both. they t off the same noid and now are mounted up where the mass air was (sd now) im pretty sure they will just mix together since they are both facing the middle. what do you think?

thanks in advance

chris

 

Every approx .002 jet increase is about an additional 5hp (remember guys reading along-dual nozzles math here), so you can figure a close staring point using the 950psi and your proposed dual .073s. I would start smaller and check all your parameters before going that big. This is my normal way, and am usually very methodical, but the one time I got in a hurry I blew my motor. Only you can decide if it's really to big and/or if ya want to go for it. Good luck and keep us updated.
You could get a set of numbered bits and use a micrometer to change to decimal sizes, and then drill out your existing .05x jets and slowly work your way up and watching your a/f as you increase, assuming you are leaving the fuel side the way it was expalined prior (8.x:1 a/f) then you'll see it leaning out and stay out of danger?
Robert

 

doing the math if twin 52s is a 200 fly wheel then twin 73s is a 110 hp more that that so it would be a 310 shot making about 250 to the wheels. am i correct. thanks again for all the help. tomarrow should be interesting

 

Correct amundo, also check the additional info added to my prior post.
Robert

 

thanks again, i just remembered a problem, my nos nozzle is only .063, so a .073 would be too large and not flow.what would happen if one nozzle flowed more than another?

 

Well on a dry nothing, on a wet then you need to vary fuel jets also, gets a little confusing...
Robert

 

so on my wet then i can run different jetting in each nozzle? just in the end watch my wideband to make sure a/f is good?

chris

 

Not really sure? What I mean is, you may end up with different a/f coming from each nozzle, dose this cause any distribution problems? or something else? I have no experiance mixing jets on dual wet hits.
Robert

 

well im not sure either. its been wet all day but is dry now so im heating up the bottle to try. i redid the nozzles theyre both up by where the mass air was next to each other in theory they should mix with each other as they travel up the intake track. any variation in a/f i would think would have time to mix or not be as drastic of a difference. ill let you know how it works.
thanks again

chris