Progressive NOS (WAS Re: Part 2: Reading Plugs, pistons,

[Bruce Plecan]

> >IMO, there is just no way *so far* to accurately
> >modulate a 800ish PSI
> >solenoid.
> >The Duty cyle is just soo slow, your more just
> >hammering it.
> Question is, do you really *need* to be that accurate?

IMO, yes, you basically have to fade it one.  It's just not realistic to
expect the crank to change rpm  that fast.

> If you size your NOS jet properly, all you're really
> looking for is a mechanism to ramp NOS delivery over
> time. This is essentially what the "Progressive"
> NOS controllers do with some degree of success.

Some degree is like kinda sorta close.  IMO,  like Len was talking about,
you do what you can with what you have at hand.

> I would think that longevity of the solenoid would
> be an issue with a DC modulated solenoid...

Very much so

> >Then there is the timing of events.
> >The fuel always lags behind the NOS, IMO.
> What if you placed the fuel solenoid physically closer

You need to place the NO2 nozzle several feet away.

> to the nozzle(s)? Make the NOS go through some extra
> plumbing on the way to the nozzle...

Accumulator bleed down probs., ie explosions

> You could also "and" the DC to the NOS solenoid with
> a fuel pressure switch in the line to the nozzle,
> and delay activation until there's adequate FP in the
> system.
> >Then synching the timing as a function of all this.
> >Now if you had a
> >ion
> >detection for detonation, well then I'll give that
> >one to you.
> This is the basic question of the efficacy of knock
> retard in general... how fast is fast enough?

On a properly tuned engine 1 detonation should trigger it in my book, and
each followind knock again more.
ie first knock should force like 4+ d of retard depending on the HP level of
the NO2.   Detonation is a real engine killer in my book.   Racing is a
whole different matter you have to flirt with it all the time, I don't think
that level of tune is appropriate for a street engine, and once again we get
to what is street.   That issue should be a entry in the FAQ for at least
here so we have a common definition.

> *Any* mechanism to cut the NOS when there's deto
> present(KR), is a Good Thing(tm) in my book. Better
> late than never.

Be much faster to kill the timing.
There is always some Nos around for an instant.

> >There are ways, but when *bleeding down the system*
> >(needs an
> >accumulator),
> >there is always a chance of a pan explosion.
> Not following you here, I guess...

You need absolute instant, and total control of it.
ie, long plumbing lines are potential areas of exposlions, are at least
allow enhance there accurance

> >I'd always thought it would be neat to use for
> >spooling up a turbo, but with
> >the correct calibration, that is getting to be less
> >and less of an
> >issue.
> >Again, IMO
> >Bruce

> There's another potential app... control a NOS solenoid
> firing co2 into the exhaust housing until the turbo
> spools up...

How about an EGR valve dumping a rich AF into the exhuast?.
I'd rather use hot gases for spinning it up.
the Garret hydralic turbo sounds like fun.
Bruce

> As far as I'm concerned, I don't want faster spool-up,
> I'm already spinning 4 tires. (well, 2 and a peg-leg)
> :)
>
> Later,
>
> Dig
> turbodig at yahoo.com
> '91 Syclone - 12.43 at 108 on factory original radials.
>
>
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