(s)praying for a mile

[XWARRENX]

NOS users.
how much NOS and how long are you spraying during a run?
gear selection.
shot size.
thanks

[JorNic Motorsports]

pm cd109 and tell him I sent you. he is Kyuss over at LAB's.

[XWARRENX]

aw shit....we've been back and forth a bunch over clutches the last couple days.

I'm gonna try to make it for the OCt meet......just to spectate more than likely.

[JorNic Motorsports]

I got one of his PM's about that too.
texas is great. low key, tons of runs, nice people, great facility.

[2fast4u2c]

The key to spraying the mile is to have at least twice as much supply as you have demand.

The main problem with spraying for such a long time (15-23 seconds) is having your supply pressure drop so drastically over the run causing a major rich condition on the top end.

If you run a 60hp dry shot (somewhere around a 44jet), you should run at least 4 lbs of juice on board.

I run a 5LB bottle and the drop in insignificant.

trying to run a single 2 - 2.5lb bottle will cause a dramatic drop.  The top end is where you get your MPH.  You need to keep your pressure up on the big end.

Just my $.02

Guy

[RansomT]

The key to spraying the mile is to have at least twice as much supply as you have demand.

The main problem with spraying for such a long time (15-23 seconds) is having your supply pressure drop so drastically over the run causing a major rich condition on the top end.

If you run a 60hp dry shot (somewhere around a 44jet), you should run at least 4 lbs of juice on board.

I run a 5LB bottle and the drop in insignificant.

trying to run a single 2 - 2.5lb bottle will cause a dramatic drop.  The top end is where you get your MPH.  You need to keep your pressure up on the big end.

Just my $.02

Guy

Guy's $.02 is worth $2,000 .

With a full 2.5# bottle , no matter how much pressure you start with, if you spray for more than just 6th gear, the pressure will bottom out.  Spraying 5th and 6th together, I saw bottle pressure go from 1400 psi to 700 psi.

[TrickTom1]

damn starting with 1400 psi? It would be better to tune it for a lower pressure.

[RansomT]

damn starting with 1400 psi? It would be better to tune it for a lower pressure.

At the time, I was running a Pressure Pro set at 825 ....

[TrickTom1]

damn starting with 1400 psi? It would be better to tune it for a lower pressure.

At the time, I was running a Pressure Pro set at 825 ....

[XWARRENX]

what kind of gearing should I be looking at?

[2fast4u2c]

what kind of gearing should I be looking at?

What's the circumference of your rear tire (roll out and be exact), your HP at the rear wheel, and your desired speed you wish to acheive?

[shiphteeey]

Gearing for 201-205 (i've changed things around).  Spraying in 3rd (approx the 1/8 mile mark) it falls on its face mid-6th gear.

2.5 lb, 40 shot dry.

Time to move up to a bigger bottle and shot!

A.

[Pete]

There's a guy over here in the UK sprays on a top-speed run with no pressure-drop.

[2fast4u2c]

He's using a nitrogen push system I believe.

Guy

[Steve A]

His board name is "Sprinta" on 200MPH.Net.

[Pete]

Yes, sprinta uses a nitrogen-push system.

[Stainless1]

Cool you bottle for 800psi, tune for that, you will be spraying liquid N20 if you bottle is in the correct position (do you have a dip tube bottle).  1200 psi and greater is gaseous N20, there is more oxygen density in liquid.  Of course if you spray from the higher pressure, the bottle pressure will drop because it is also cooling.  Weigh your bottles before and after to know what you have left, pressure is not a good indicator (unless it is zero).  The best bet is to have 25% left in the bottle at the end of the run.  So start at the half and work back.  incidentally, there is only about 10% power loss at 100% rich with N20.  Rich is soooooo much better than lean....
that is my $.02