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Message-ID: <3A710139.8123E86A@rapidnet.com>
Date: Thu, 25 Jan 2001 21:46:50 -0700
From: Joe Amo <jkamo@rapidnet.com>
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To: Wester S Potter <wspotter@jps.net>
CC: John Beckett <landspeedracer@email.msn.com>
Subject: Re: NOS
References: <B6959313.1865%wspotter@jps.net>
Wes, yes, there are Progressive nitrous controllers now, we use one on the
bike, and
that is the biggest
reason that we have just started to gain some speed, before it was nearly
futile,
even with many small
stages, these controllers utilize "pulse width modulation" and vary the pulsing
of
the solenoid, similar to
the way electronic fuel injection pulses injector
Joe :)
Wester S Potter wrote:
> Joe, John,
>
> If pressure drop is great enough that it results in a loss of power going
> into the third mile of traps, why is the second bottle timed to trip at that
> point? Wouldn't a metered, constant flow supply a more even boost? Is
> there a problem feeding both bottles into a single, regulated, supply line
> to the plate under the carburetor? That initial hit is so great that cars
> tend to get loose because of the sudden surge of power. (There was a T-Bird
> that spun out and bent the hood in some funny ways with the hit at the start
> of the timed miles a few years back ... sponsored by NOS Systems) I seems
> that that point is where the metering would be more essential so that the HP
> increase is more gradual. Obviously there is something I don't have
> experience with and don't understand about this sequence. I've listened to
> discussions at SEMA in the NOS Systems booth and they are emphatic about
> getting that first boost in a regulated way. Timers and solenoids to
> control it until the whole boost is there. Perhaps these are street
> applications they are talking about rather than full on racing requirements.
>
> One of these days I'll have to dig out the pictures of the Pontiac Firebird
> with 4 40# bottles in the back window of the car. They used the NOS to cool
> the intercoolers on a gasoline fueled car car ... that went 296 mph.
>
> Wes
>
> > John, just think about it alittle, your pressue drop will be similar even
> > with
> > the 15 lb bottle, provide you had more than a little gas left in the bottle.
> > Remember that one approach is to pressurize the nitrous bottle with another
> > gas,
> > like Dahgren did, somewhat costly but does keep the pressure up.
> >
> > As far as bottle heater goes, will mostly keep pressure consistent at the
> > start
> > of the run, and will contribute little further down course. But it help
> > tremendously to start at 1050 vs 700 or 750, why give away 300 lbs of
>pressure
> > drop right off the bat? that might give you at least another mile, depending
> > on
> > your hp combo, as these orifices are what regulates pressure drop to a
>large
> > degree
> >
> > Have you thought of ensuring decent bottle pressure at each start ie around
> > 1050psi, then incorporate another bottle with decent pressure to "be turned
> > into
> > the system" by a solenoid LATER in the run, then you would at least augment
> > and
> > bring up the pressure by some margin, to get you through the run with
>enhanced
> > pressure until the natural gas law takes its toll again, and equilibrium
> > between
> > the low and high pressure bottles takes shape. Nitrous Express has a
> > pressure
> > transducer regulated bottle heater, I have one now, would have been a god
>send
> > at
> > WOS.
> >
> > Joe
> >
> > John Beckett wrote:
> >
> >> Ed
> >>
> >> I know I was very surprised at how much N20 is consumed on the long course.
> >> Pressure drop in the bottle is the problem. You can run a full mile with
> >> great success, but the pressure drop after two miles of running tends to
> >> make it nose over. So running three miles is out of the question for me.
> >> Would think a 15lb. bottle would be better than 10lbs. Maybe two like Keith
> >> is planning is the ticket. Wondering myself if a bottle heater would help?
> >> Dave would know.
> >>
> >> John
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