pcm controlled nitrous

[Kelly Parker]

I was thinking strictly dragstrip.
I think everybody dragraces at WOT :-)

If you set the RPM range where you would normally just "push the button" it 
would automate the process and prevent you from getting carried away. I'm 
just trying to improve on the button to finger interface without spending 
several hundred bucks.

Decaf is the work of the devil,
Kelly


>From: Scott Parkhurst <ScottP at mcmullenargus.com>
>Reply-To: gmecm at diy-efi.org
>To: "'gmecm at diy-efi.org'" <gmecm at diy-efi.org>
>Subject: RE: pcm controlled nitrous
>Date: Fri, 19 May 2000 11:09:32 -0700
>
>Switch to decaf. Most nitrous systems use an arm and fire switch, based on
>fuel pressure and WOT. The programmable systems allow much more accurate
>tailoring of the nitrous curve, but you've still got to be at WOT for them
>to enable and operate the computer program. You wouldn't want to half-ass
>this setup, as nitrous and fuel ratios must be kept constant (and a little
>rich) to ensure no damage occurs to the engine. I setup a system like this
>on a 99 TA/LS1/4L60E, and it works flawlessly on both the dragstrip and the
>road race course. Once the throttle is at 100 percent, the computer begins
>the program, waiting .2-second, starting the nitrous flow at 65 percent,
>then going to 100 percent within another.25-second. All of these numbers 
>are
>variable via the NOS programmer. The car has all SLP bolt-on suspension
>goodies and Eibach spring/shock upgrades, and 18-inch wheels with Toyo
>Proxes tires. When the juice hits coming off a corner, you can't feel it
>shock the tires, so they stick. You do feel the dramatic addition of 100hp
>in the straights, and I went through a 12.5-pound bottle in a single
>15-minute session at Buttonwillow (CA) raceway. Too much fun! Safe, sane,
>and serious.
>
>Scott Parkhurst
>Tech Editor
>Popular Hot Rodding Magazine
>
> > -----Original Message-----
> > From:	Kelly Parker [SMTP:bigblockfw at hotmail.com]
> > Sent:	Friday, May 19, 2000 10:36 AM
> > To:	gmecm at diy-efi.org
> > Subject:	pcm controlled nitrous
> >
> > While I was gettin' hopped up on coffee this morning I began to wonder 
>if
> > there was a way to control nitrous injection with the pcm.
> >
> > What I'm thinking is......As I recall the commercial nitrous 
>"controllers"
> >
> > allow you to set when and how long the gas is injected.
> > Since the EGR valve wouldn't fit in my engine compartment :-) I removed
> > it.
> > The control is still in the pcm along with the wiring, The pcm allows 
>for
> > egr min RPM and max RPM, it seems to me you could replace the EGR 
>solenoid
> >
> > with a nitrous solenoid. Since nitrous has an "arm" and an "inject" 
>switch
> >
> > (arm is a toggle switch, inject is a momentary)
> > it seems like you could just switch off the toggle to keep it from 
>blowing
> >
> > your shorts off when you were just cruising. When you wanted to hurt
> > somebody just arm it and go.
> >
> > Has anybody tried this?
> > Does it make sense?
> > Should I switch to DECAF?
> >
> > Kelly
> >
> > ________________________________________________________________________
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> > 
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