My drag race chrysler uses two stages . One plate and
one fogger type . The plate is a very low hit (150)
and the nozzles are between 250 and 300. Because it is
a chrysler my "testing" (read-- blown up stuff) has
shown that because of the two matched exhaust ports in
the center of each bank of cylinders they need a
different setting than the outer cylinders on the jug.
They simply run hotter naturally. An equal setting in
all holes with a BIG plate hit produced a big BANG.
Now the plate hit is relatively small to protect
against uneven mixing in the plenum. My good run shows
all the plugs about even.It took a few set of pistons
to figure that out .
I know a couple of pro mod guys running "three"
stages. Most of them admit that not many have that
third stage figured out and it is used only for a
final round "I am gonna lose if I don't do something "
effort . It usually ends in death smoke but maybe a
winners check.
By the way with all of the nitrous in my big heavy car
it goes across the finish line with only 15 degrees of
timing in it at the drag strip. MSD timing controller
saves me from any more big BANGS in my view.
George in DC
Hemi Porsche guy
--- Dick J <lsr_man@yahoo.com> wrote:
> Thanks, to you too. I'm cataloging all of this
> stuff.
>
> Dick J
> --- dahlgren <dahlgren@uconect.net> wrote:
> > 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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