Question concerning my Nitrous and Air / Fuel.

[Daveeed]

I took the opportunity to dyno my Busa on Saturday and was surprised by the result.
All Motor:      181.4 HP   106.6 Torque
NX wet kit:      228.9 HP   143.1 Torque.
I’m running a NX wet kit with retard box and Schnitz controller.
Bottle pressure was at the top of the Green on the Gauge.
New NX fuel pump. (The 4” long silver cylinder type of pump)
Jets: 24 Nitrous   22 Fuel

By the Book, this jetting should produce about a 70hp hit.
The problem points to my air/fuel mixture, which starts at 13.0 - 13.5 but then Climbs into the 15’s in a sinusoidal type of line. It aint constant or smooth at all.
The air fuel graph seems to cycle up/down every 1,000 rpm.
My base line Brock map is smooth and flat, like a great map should be.

I’m way freakn lean and have slowed as I have changed jetting trying to step up.
Jets:   20 Nitrous   20 Fuel      9.168sec. 155.8
Jets:   20 Nitrous   22 Fuel      9.220sec. 156.2
Jets:   24 Nitrous   22 Fuel      9.340sec. 148.9

The big questions:

Could I have a “bad” fuel solenoid?  How would I know?
Would the bad fuel solenoid cause the variation in ratio?
Running NOS… What is the “target” air fuel ratio?  What’s to lean?

Will dropping my Nitrous jet to a #22 fix my air/fuel problem or should I
Switch the jets to 22 Nitrous / 24 Fuel?
Im assuming I have 4 - 5 lb fuel pressure.

Thanks in advance!

[Daveeed]

Whelp, I took the opportunity to trouble shoot my NX wet system and found I had a bad operating fuel solenoid. The resistance of the solenoid was higher than the Fuel solenoid and was not fully lifting consistently off the seat. As you can predict this put me in a lean condition that was inconsistent.
The bike still dynoed at 180hp all motor so I shouldn't have hurt it that bad.

It all makes sence now... The guy at NX told me I sould have been very rich with some previous jetting patterns... O well. Gusss I should have checked my plugs.
Into the 8's

[hayabusa]

Daveeed,


How are you connecting your fuel line to the tank? (photos), and what year is your bike?

I need to know, sorry to hijack your thread.  

Thanks.

[Daveeed]

The bike is a 99.
I had trouble with adding a T into the fuel line, it surged real bad at launch.  I went ahead and ordered and installed the Pingle dual flow petcock. Well worth the money. Only Issue is I need to run more gas in the tank when racing for some reason