I want some opinion's here I have always been told that the amount of power you make comes from the amount of fuel you can put into the cylinder and properly burn it.

Example
If we take a direct port and jet it at 28/28 times 8 ports at say 6 psi of fuel pressure but are AFR is well below 10.0 will it make 250hp?
Now we take the same 28fuel jet and the same fuel pressure but raise the nitrous jet to get the desired afr is it still a 250 shot?

I am running a 28f at 5.5 PSI with a 34n at 1,000psi bottle pressure How big is my shot?

 

350 shot.

 

A Nitrous jet size of .028" or 0.7112mm should produce:
283.25 HP with 8 port(s)Actual HP to the wheels: 240.76 HP



A Nitrous jet size of .034" or 0.8636mm should produce:
417.65 HP with 8 port(s)Actual HP to the wheels: 355.00 HP

I'm no expert but your 28n, 28f tune up seems really rich so it wont make as much power as say a 28n , 24f even though your giving it less fuel.

 

So where do you or how do you get this info? NOS says 28=250 32=300 36=350 40=400 42=450+ Are they just way under rating them?

 

Ok so i have always looked at it like the amount of fuel in the cylinder burned correctly will make xxx amount of power but i need to be looking at it as the amount of nitrous in the cylinder will make xxx if burned correclty

Am i right here?

 

If you have he correct tune up then both of your statements work.

"Burned correctly" is the key. If its rich it will make less power, if its lean it will make less power.

 

also an update on my car, after the help you guys gave in one of my threads a month or so ago I rejetted my direct port from 40/40 to a 28f 34N and worked on getting it all in in 1 sec or so. I have the afr some what close and have ran much better times than before.

New times from thursday night

1.35 60ft
5.82@123.7

And tonight we had issues getting it to hook but still ran



Here is a vid my wife put together from thursday night
http://www.youtube.com/watch?v=gASYisfxW_U

 

Nice runs!

What tire? looks like you need to do a little harder burnout, maybe that will help it hook.

 

A 325 MT radial Yea i know the burn out sucked lol that was one of the first passes i have made in the car it is normaly my wife driving.

 

325.. big difference from a 250 you thought. now only if you can get her down from 3900lbs. you would be really burning up the track!!

 

blueballz - keep the drama out of here. this is a tech discussion. if you have an issue with someone personally, want to run them heads up, or call him out on the weight of the car, then do it on PM or some other site.

 

Man you never give up do you?
Just freaking drop it already. Why follow over here and start? People will see why this **** has gotten so far outta hand.. You seen the pictures of the scale at the chasis shop.. I mean come on like Greg said it had 3/4 tank of gas and him in it which is over 230lbs 2 memphis 10s in a box and and an amp the car has no wieght reduction. What the hell do you want? What do they wiegh stock 3600+ lbs?

3969-Greg(230lbs)=3739
3739-8 gal(estimate 64lbs) fuel=3675
3675-2 10inch speakers,box and amp(estimate 60lbs)=3615
now what should a fully loaded Trans Am with everything in it minus spare and front swaybar with added LSX block,vic jr intake,12bolt moser, and a th350 with stand alone and directport system and a 15lb bottle(34lbs full) wiegh? Why is the wieght of the car so hard to believe???

Now since I know you didn't read everything we have written the only changes are
8 gals less fuel,race water pump, no a/c compressor and speaker box . now simple math should equal out to about the 3800 range race wieght during above said runs..

 

Well, there are some other things that can efect your shot size, like solenoid size, number of them, line size, distribution style, nozzle design, AFR, bottle pressure etc.

I test systems off the car with a timer relay, and spray them for exactly 10 sec. with a bottle on the scale. That way you know how much N20 is used in 10 sec, and can calculate how much potential HP can be had from that.

Looking at your jetting I'd guess your in the 300+ range, but like everyone else, its just a shot in the dark.
Vinny

 

in most cases the nos side of the shot is what a lot of people rate their hp at. then they use the fuel side to adjust the a/f. i really never heard of using the fuel side to rate your hp or actually shot. if that was the case then when i picked up 150hp to the wheels on a TNT 100 and it was rich, you are saying that if i jet down on the fuel side i would be picking up more power "because i was really rich" but at the same time i would be considered using less of a shot because i had to jet down on the fuel side? or is this just a direct port thing? what would you do with a dry shot? if you have to adjust your a/f ratio it would be almost impossible.

 

Nozzle positioning in respect to the MAF will adjust your A/F ratio on a dry shot. That or you could use the interface controller to adjust it as well.

Not really sure what you are trying to get at with the fuel side of things. Based on a given flow rate of nitrous of course you could calculate the correct amount of fuel you need to achieve max power. This would work the same way in reverse. I'm not really sure how you got what you did from vinny's post. He was basically saying you could flow test the bottle to see how much nitrous you flow in a certain amount of time.

 

yeah, i accidentally quoted him.

 

i didn't want to get off topic here but most f-bodys in my exprience weight between mid 3300 and high 3400 lbs. the heavier cars usually have the ws6 wheels on them. this is stock trim of course. 3600 lbs is in the gto range i believe. i have a certified scale at work the is calibrated every 2 months and is regulated by the state. my car with me in it weights 3680. i am 200lbs and full weight with a cage. this includes the moser 12 bolt and t-400. no weight is taking out of my car. everything works right down to the cruz control. this scale is right on target with the scales at moroso and the CAT scale i paid to get weighed on at a truck stop up here. sorry to get off topic here....