#40 Jet dry kit horsepower question

[Jeff954RR]

I have my dry kit installed on my busa. Bought the billet piece off a member here on the boards to center mount my nozzle in the airbox. I have a NX dry nozzle with a slit in the side (Fanner?). .063 orifice solenoid. -4 supply line. On the dyno ,once I got my syphon tube issue worked out, the bottle was roughly @ 800 pounds maybe more. The most horse it squeezed out was 202.4 and 113 ft/lbs. Air fuel was tuned to 12 to 1 (tuner wanted it fat). Stock horse was 159. Any ideas why my numbers seem down from what I've been reading on the boards? Only thing I can think of is my jet isn't right.

[M Wright]

With a 40 jet at 800psi you are right on point.  Heat the bottle to 900

[Jeff954RR]

Its a 2.5 lb bottle. I'm not exactly sure if my bottle pressure was higher or not. I know it was at least 800. The only gauge I have on it is the POS gauge on my regulator for my air shifter. Does 100 PSI make that much difference in power? I know that if its down around 500 PSI then thats no good.

[Hybrid]

My buddy has an 06 Busa and with the #40 jet he made 214 hp/146 torque. He was just using an MPS Fast fi box and BMC air filter. Stock pipes and no Power commander. Bottle pressure was between 950-1000 psi. A/F was nice and fat at 10:1 on the spray. Here's the dyno sheet:

[Jeff954RR]

My buddy has an 06 Busa and with the #40 jet he made 214 hp/146 torque. He was just using an MPS Fast fi box and BMC air filter. Stock pipes and no Power commander. Bottle pressure was between 950-1000 psi. A/F was nice and fat at 10:1 on the spray. Here's the dyno sheet:

Yeah his was one off the ones I saw which makes me go WTF is wrong with mine?

[Hybrid]

My buddy has an 06 Busa and with the #40 jet he made 214 hp/146 torque. He was just using an MPS Fast fi box and BMC air filter. Stock pipes and no Power commander. Bottle pressure was between 950-1000 psi. A/F was nice and fat at 10:1 on the spray. Here's the dyno sheet:

Yeah his was one off the ones I saw which makes me go WTF is wrong with mine?

It's definitely your bottle pressure. 800 psi is not enough...bump it up! He has since put a #44 jet in there and got 220hp/153 tq and still with a rich a/f ratio.

[Jeff954RR]

It's definitely your bottle pressure. 800 psi is not enough...bump it up! He has since put a #44 jet in there and got 220hp/153 tq and still with a rich a/f ratio.

Well Crap. There are only 2 more races this year at my local track. This wed and next. Not enough time to get a bottle warmer and good pressure gauge lined up. My bottles in my tail so I don't want to torch it. Plus with no good pressure gauge my luck would be I'd burst the rupture disc. I've got a #44 jet in the cabinet at home though . Oh well at least I will get some passes this year on the bottle before I have to put it up.


Edit:
Just looked closer at your buddies graph because mine made a 136 ft/lb run one of the pulls but it was because the back tire spun on the dyno. Looks like his bike is hitting a lot sooner than mine too. I'm not spraying till 7,000 RPMS

[chevelle]

you must have a 2lb bottle,a 2.5 won't fit in the trunck

not exactly a cure all,but tapeing a few of those hand/feet warmer packets on the bottle will help a little

2 lb bottle

59 degrees,760 lb's

2 packets
3 hours later,55 degrees,860 lb  not bad for 66 cents 

[Jeff954RR]

you must have a 2lb bottle,a 2.5 won't fit in the trunck

I traded subframes with a guy who went turbo on his busa. He modded the subframe to hold the bottle. I promise its a 2.5 lb bottle in my bike right now. I have both a 2 and a 2.5 bottle. The base of the bottle is down by my tail lights and the neck is over where my tool pouch goes. It was the trickest mount I'd ever seen for a busa. The bottle sits at a perfect angle for the syphon. Everything is good and solid because it part of the frame.

[M Wright]

you must have a 2lb bottle,a 2.5 won't fit in the trunck

not exactly a cure all,but tapeing a few of those hand/feet warmer packets on the bottle will help a little

2 lb bottle

59 degrees,760 lb's

2 packets
3 hours later,55 degrees,860 lb  not bad for 66 cents 

You can also use a travel baby bottle warmer.  They cost $5 from babies R us and are 12v

[Hybrid]

you must have a 2lb bottle,a 2.5 won't fit in the trunck

not exactly a cure all,but tapeing a few of those hand/feet warmer packets on the bottle will help a little

2 lb bottle

59 degrees,760 lb's

2 packets
3 hours later,55 degrees,860 lb  not bad for 66 cents 

That's a great idea, never thought of that!

[Hybrid]

If you ride in a colder climate (like where I do) then it wouldn't be a bad idea to run a couple jet sizes bigger to make up for the loss in bottle pressure. That's if you don't have a bottle heater though...

[chevelle]

you must have a 2lb bottle,a 2.5 won't fit in the trunck

I traded subframes with a guy who went turbo on his busa. He modded the subframe to hold the bottle. I promise its a 2.5 lb bottle in my bike right now. I have both a 2 and a 2.5 bottle. The base of the bottle is down by my tail lights and the neck is over where my tool pouch goes. It was the trickest mount I'd ever seen for a busa. The bottle sits at a perfect angle for the syphon. Everything is good and solid because it part of the frame.

neat.....can we get some pics when you get a chance

[Shamrock]

2.5

[Hybrid]

How did you have your siphon tube positioned so that it gets good pickup?

[M Wright]

I'm guessing the siphon tube was removed. 

thats a 2 pounder isn't it?

you can fit a 2 pounder in the hump with a tiger tail. 

[Shamrock]

I'm guessing the siphon tube was removed. 

thats a 2 pounder isn't it?

you can fit a 2 pounder in the hump with a tiger tail. 

2.5 lbs

and the  tube  was curved to kinda like this

[Shamrock]

Bottle valve with custom siphon tube

[Hybrid]

I'm guessing the siphon tube was removed. 

thats a 2 pounder isn't it?

you can fit a 2 pounder in the hump with a tiger tail. 

2.5 lbs

and the  tube  was curved to kinda like this

That's what I thought. I tried that on my buddy's Busa with the Tiger mount but it didn't seem to pick up the nitrous that well so we put it in the swingarm finally.

[Shamrock]

I'm guessing the siphon tube was removed. 

thats a 2 pounder isn't it?

you can fit a 2 pounder in the hump with a tiger tail. 

2.5 lbs

and the  tube  was curved to kinda like this

That's what I thought. I tried that on my buddy's Busa with the Tiger mount but it didn't seem to pick up the nitrous that well so we put it in the swingarm finally.

you just have to angle it just right

[Jeff954RR]

Best Pic I have right now.