Dave
This system I have has a separate fuel enrichment, for nitrous, based on
injector pulse width...which is totally different than the regular map
used...so I don't have a clue how much width to try. Guess you still use
jets to control the amount of nitrous introduced and to regulate the
approximate HP jumps.
Was thinking of introducing the nitrous with spray bars in a plate under
the throttle bodies, but maybe a set of fogger nozzles would be better?
John Beckett, LSR #79
----- Original Message -----
From: "dahlgren" <dahlgren@uconect.net>
To: "Thomas E. Bryant" <saltracer@awwwsome.com>
Cc: "John Beckett" <landspeedracer@email.msn.com>; "Land Speed List"
<land-speed@autox.team.net>
Sent: Thursday, June 01, 2000 10:28 AM
Subject: Re: Nitrous
> are you using alky for both?? did some testing with a noted pro mod
> engine guy and found that if you are running alky as the main fuel the
> nitrous likes gasoline better as an added fuel.. makes a little more
> heat and lights off much nicer. For whatever that is worth to
> you.......Oh and watch out with the dry nitrous systems they can cause a
> big problem depending on how they calculate the enrichment fuel and
> where you add the nitrous.. Most just add a percent of the base map fuel
> which is not the way to go at all.. Nitrous needs the same lbs/hr no
> matter what the rpm is! Unless of course you have an engine that makes
> the same HP all through the RPM range LOL!!! and if you add a lot of
> nitrous in the plenum all bets are off as to how much goes to each
> runner but the injectors are putting the same amount of fuel in each
> runner. Can have some very rich and some very lean cylinders. Been there
> done that got the pistons to prove it.
> Dahlgren
> Engine Management Systems
>
> "Thomas E. Bryant" wrote:
> >
> > John,
> > Hmmm! Don't know if I should help you on this??? You thrash me pretty
> > good without nitrous, but then I have no secrets.
> >
> > We run a Kinsler prepared Crower 2.5 inch injector with the nitrous
> > plumbed on the underside of the manifold. We use a NOS 200 HP system,
> > single stage system that is jetted with fixed nozzles (one fuel and one
> > nitrous) in each intake port. We use a holley fuel pump with an
> > adjustable regulator for the added alcohol when nitrous is applied. This
> > past year we went to a digital MSD that retards (adjustable) when the
> > nitrous is applied. We generally use the nitrous for the last 1 1/2
> > miles at Bonneville and in high gear at the lakes.
> >
> > We have two 10 pound bottles on board. I found early on that for best
> > performance you need a fresh bottle on each run. However, our fastest
> > run at the World Finals was a second pass on the same bottle. We use
> > about 3 lbs. per run.
> >
> > When I was running geared for 8000 to 8200 RPM, the application was very
> > thrilling, like hitting passing gear, but with the present gearing
> > (7600) it is fairly soft, but still exciting. It can get loose when the
> > nitrous is turned on. Nitrous was the trigger for Jeff's spins.
> >
> > A word of caution, I carried a nitrous system on the car for a couple of
> > years before I used it because I was having trouble with a high speed
> > by-pass system on the injection. You have to be certain that the engine
> > is jetted correctly before using the nitrous. The nitrous system is
> > properly jetted, but if you are lean on the basic jetting, when the
> > nitrous comes on it gets expensive, and can shorten your week. I run the
> > fuel pressure on the high side to be safe. With gasoline, proper
> > pressure may be more critical, with alky being a little rich doesn't
> > matter that much.
> >
> > It's fun, but be careful. See you at Muroc.
> >
> > Tom, Redding CA - #216 D/CC
> >
> > John Beckett wrote:
> > >
> > > Tom
> > >
> > > OK, now that I have Nitrous on the brain...hmmm...that's
interesting. I
> > > have a few questions for those who run the stuff on the 'salt' or
lakes. And
> > > you have been doing it successfully for some time now. 1) I guess
you run
> > > with a Hilborn style injection system. So how do you plumb the
> > > system...fogger nozzles? 2) Do you run 1, 2 or more stages? and
> > > approximately how much HP per stage? 3) Do you use a controller? 4)
When
> > > do you first apply the Nitrous? certain speeds, RPM? 5) How much
Nitrous
> > > do you carry and use per run? 6) What's the traction situation like
when
> > > you hit the button?
> > >
> > > Thanks
> > > John Beckett
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