One Bottle vs. Two ???

Steve,

Question on the one bottle vs two -

Running two foggers, 28/32 and 24/28 - Bottle pressure at the hit is right at 1000, at the end of the 1/4, it is 830 - how much do you figure the pressure drop is effecting ET and MPH that could be gained by going to two bottles?

Thanks for the input...

I'm sure your leaving a little on the table.. I have seen gaining 2-3 MPH many times when adding a second bottle, and plumbing properly. Also lowering your leave pressure will help reduce the pressure drop during the run too.. Thanks, SJ

What would be the proper way to plumb it?

I would use 2 -6 lines as well as a common cross over in them at the intake.. SJ

might want to pull a little more timing out of it. A friend of mine added a second bottle ( and nothing else) to his 706 with 2 foggers (ugh ! Chevy ) and and burned 2 pistons. Would hate to see you hurt your bullet.

Thunderstruck wrote:might want to pull a little more timing out of it. A friend of mine added a second bottle ( and nothing else) to his 706 with 2 foggers (ugh ! Chevy ) and and burned 2 pistons. Would hate to see you hurt your bullet.

so are you saying his tune was incorrect to begin with ?? why would adding a second bottle in the mix burn stuff up ?

No he has run that tune up for the better part of 2 seasons. He spoke to Pat Musi. Pat told him that when ever you add a bottle you need to compensate by pulling a little timing out of it. I realize why you are questioning it because I have the same question myself (N20 pressure is the same 1 bottle or 2) I will have my friend expand on his explanation behind it later tonite and get back to you. But until then its better to be safe than sorry.

Really the biggest benifit to adding a second bottle is to minimize the pressure drop during the run..

Just as a reference I recall from back with I had my Pro Mod here's what I found...

On two stages and a single 10# bottle the car would drop 100 PSI from the start to the finish... With two 10# bottles it would drop only about 25-30 PSI..

I can't talk for the fella above, but if he had a good two stage tune that was close to the edge, then all but eliminated the presure drop, it can hurt parts.. You need to have an idea where your at with you tune or ease your way into this.. Hope this helps.. Steve

Steve, you mentioned using a cross over/balance tube. Do you have any more info for/against balancing bottle pressure?

In the past I have heard both sides of the argument for/against using some way of balancing pressure between two bottles, (for, obviously the argument that both bottle pressures are equal the whole pass.....against, the argument that one system would/could possibly steal liquid volume from the other system at the cross over, supposedly starving it to some degree). I have seen cars with dual bottles/systems go fast both with & without balancing bottle pressure, so obviosly neither method is 100% right or 100% wrong.

I guess from a bench racing standpoint I can see both sides of the argument could be true. But when you factor in two bottles at 900 - 1100 lbs of line pressure I am kinda doubting that with a balanced setup one system could really steal liquid volume from the other. I guess it could be possible if the main feed lines were too small to begin with, but that's just a guess either way.

Thanks for any info.

Just over the years from testing several different ways, I just found for my preference to be with a common cross over.. As far as one bottle stealing from the other ?? Yes, this can happen. Any of you have two bottles running into a "Y" fitting feeding your system or systems ??

Ever notice that one bottle always has quite a bit more used out of it ??

One of the reasons as well is that your almost never going to get both bottles to drop pressure at the same rate.. That being said, ones going to back feed into the other the closer you make them common... Hope this helps you guys.. SJ

Thanks Steve.

Your very welcome.. Thanks, SJ

if you are worried about one bottle stealing from the other why not just put a couple small check valves inline so one can not steal or back feed into the other?


Randy