Dragstrip Plus

Sun Oct 8 01:45:42 GMT 2000

Heres the link for those lost to FTP.

ftp://ftp.diy-efi.org/incoming/dragplus.zip

----- Original Message -----
From: Bruce Plecan <nacelp at bright.net>
To: <gmecm at diy-efi.org>
Sent: Saturday, October 07, 2000 2:17 PM
Subject: Re: Dragstrip Plus

>
> Large runner TPI is at least as good as a single plane
> low riser.   I used single low for my cross fire.
> Try using more and see where you wind up.
> The it's always easy to over estimate here or there and look at simliar
> results.
> Maybe just me, but takes a far bit of work for the numbers to line up,
least
> in my experience.  Meaning have actual results lining up,  and then look
at
> projections, and see what the trends are, while reults do vary, several
past
> cars things were close, and I mean in hundreths, not tenths
> Bruce
>
>
>
>
> > Dragstrip plus reports a 1/4 ET of...
> 12.74 at 108.2mph for my combo using an intake manifold choice of "dual
> plane/sports
> > car" (fully upgraded large tube runner setup with semi-siamesed LTRs).
> > That's pretty dang close to my run before the MiniRam and new injectors
> > (12.58 at 107.9mph).
> >
> > Changing the intake manifold to "med. rise single plane" (i.e. MiniRam)
> > yields an ET of 12.61 at 108.4mph.  Wierd.
> >
> > It also says that I need 33.2lb/hr injectors.
> >
> > Tim
> >
> >
> >
> > This all seems way wrong to me.
> >
> > At Sat, 7 Oct 2000 11:44:42 -0500 (PDT), timsiford at hushmail.com wrote:
> >
> > >
> > >
> > >Bruce,
> > >
> > >>Man, I hate hearing of you going past something without testing.
> > >
> > >I apologize for not quite following ... 'past something'?
> > >
> > >>$130 GTech or stop watch may have answered your question.
> > >>  Running something like Drag Strip plus (at FTP), will give you a
> > >clue
> > >>of what your car might run, and a few passes.
> > >
> > >Before the MiniRam and 30lb injectors I was running 12.58 at 107.9mph (NA,
> > >stock body panels, stock wheels).  I went to the track one time with
> > >the
> > >MiniRam installed and WITH the stock 22lb injectors still installed.
> > > I
> > >was running 13.0 at 105.x mph.  I couldn't get any traction and the
weather
> > >was hot and muggy.  This was also completed at a different track which
> > >'for
> > >some reason' everyone has found to be approximately 0.1 slower.  So
> > >- with
> > >traction, good weather, and the same track I would be running about
> > >the
> > >same.
> > >
> > >If the weather holds up I will be taking her to the track this coming
> > >Saturday
> > >to find out if the 30lb injectors made a difference.  I don't trust
> > >my butt-
> > >o-meter.  However, IMHO - the car is out of balance right now.  Balance
> > >is key.  I'm running crappy SLP 1-5/8" headers which cannot support
> > >the
> > >6000+rpm blasts.  However, I have a set of Hooker SuperComp Long Tube
> > >headers
> > >sitting on the floor next to me that will be installed in the spring.
> > > I'm
> > >shooting for NA 11's.
> > >
> > >>There is enough info., to
> > >>quesyimate where you are are, might be, and confrm with plugs.
> > >
> > >With that said ... what plugs do you recommend.  I'll freely admit that
> > >I know squat about plugs and how to read them.  Right now I have the
> > >Bosch
> > >Platinum +4 plugs installed.  Should I switch to a standard champion
> > >plug?
> > > I have the link that you posted to help in reading plugs and will be
> > >using
> > >that along with some books that I have that show good color pictures
> > >for
> > >reading plugs.
> > >
> > >Tim
> > >
> > >>Bruce
> > >>
> > >>
> > >>> Dave,
> > >>>
> > >>> Understood.  I'm in class right now but I'll post the PWs that gave
> > >>me the
> > >>> 100% DC later tonight.  I wrote a convenient VB program that I use
> > >>to
> > >>calculate
> > >>> all sorts of Automotive data.  The DC is based on batch fire cars
> > >>where
> > >>> 100% DC was equivalent to an injector Pulse Width of 10.0ms at
> 6000RPMs.
> > >>>  I'll post the full formula later.  NOTE:  I didn't consider opening
> > >>and
> > >>> closing time.  Thus, the DCs could be even higher.  I went over and
> > >>over
> > >>> and over swapping out my injectors.  Everyone in MAFB said that I
> > >>shouldn't
> > >>> need to go higher than 24lb injectors.  Diacom also reported AOK
> > >O2
> > >>voltages
> > >>> at WOT throughout the entire WOT run (0rpms->6500rpms).  I replaced
> > >>my
> > >>injectors
> > >>> SOLELY because of the DCs I was seeing.  Many people told me not
> > >to
> > >>replace
> > >>> my injectors ... that the 22lb injectors would be enough.  Diacom
> > >>supported
> > >>> that.  But, the DCs did not (and I was running 52psi at the rail).
> > >> I
> > >>upgraded
> > >>> to 24lb SVO injectors based on everyone's recommendations.  Well,
> > >>with the
> > >>> 24's I was seeing almost 90% DCs at 6500rpms.  Those injectors were
> > >>on my
> > >>> car for only an hour before I ordered a set of 30's.  The 30's have
> > >>acceptable
> > >>> DCs ... in the order of 77% at 6500rpms ... and, the car idles
great.
> > >> I
> > >>> have the injector constant set to 33lb/hr in the PROM and I am
running
> > >>45psi
> > >>> at the rail.
> > >>>
> > >>> I do remember that at 4500rpms my injector pulse width stayed pretty
> > >>static
> > >>> until up to 6500rpms.  The fact that the RPMs were increasing and
> > >>the IPW
> > >>> remained the same caused the DC to rise substantially.
> > >>>
> > >>> My butt-o-meter is very inaccurate.  You're talking with someone
> > >who
> > >>couldn't
> > >>> tell too much of a difference after swapping heads/cam.  But, with
> > >>the new
> > >>> SVO injectors (30lb) I noticed a difference in the upper RPMs.  If
> > >>I get
> > >>> to the track soon I might be able to prove it :-)
> > >>>
> > >>> Tim
> > >>>
> > >>> At Thu, 5 Oct 2000 10:00:52 -0400, "Dave Zug." <dzug at delanet.com>
> > >>wrote:
> > >>>
> > >>> >
> > >>> >To clarify, What Pulse width (in Ms) are you calling 100% DC  at
> > >>4500
> > >>> >RPM?
> > >>> >
> > >>> >Were your PW's constantly INCREASING as RPM went up?
> > >>> >
> > >>> >My 383 CI (360hp thereabouts, almost same cam as yours- less flow
> > >>above
> > >>> >5500
> > >>> >though, stock lower intake) uses stock 22# and stock FP almost,
> > >hits
> > >>> >85%
> > >>> >static for a BRIEF moment after the shifts. o2's still on the rich
> > >>side
> > >>> >according to GM sensor (093) , and plug condition backs it up.
> > >>> >
> > >>> >This is not meant as evidence contrary to your observations - just
> > >>more
> > >>> >info
> > >>> >to add to the collection.,.. mine and yours.
> > >>> >
> > >>> >----- Original Message -----
> > >>> >From: <timsiford at hushmail.com>
> > >>> >To: <gmecm at diy-efi.org>
> > >>> >Sent: Thursday, October 05, 2000 9:49 AM
> > >>> >Subject: Re: Nother thought
> > >>> >
> > >>> >
> > >>> >> I was running the stock 22lb injectors on my IROC (218cam, AFR
> > >>heads,
> > >>> >MiniRam)
> > >>> >> for about 3000 miles before swapping to 30lb injectors.  At WOT
> > >>I
> > >>> >would
> > >>> >> reach 100% DC by 4500rpms.  I would continue to shift at 6500.
> > >> This
> > >>> >is
> > >>> >>  great example of how the stock O2 cannot be used for tuning.
> > >>The
> > >>> >O2
> > >>> >volts
> > >>> >> were approx 830mV and greater throughout the entire RPM range
> > >even
> > >>> >though
> > >>> >> I was hitting 100% DC.  After switching to 30's I noticed
> significant
> > >>> >improvement.
> > >>> >>  The stock 22lb injectors never falterered and still function
> > >great.
> > >>> >>
> > >>> >> Tim
> > >>> >>
> > >>> >> At Wed, 4 Oct 2000 23:22:33 -0400, "Bruce Plecan"
> <nacelp at bright.net>
> > >>> >wrote:
> > >>> >>
> > >>> >> >
> > >>> >> >Anybody have any info., about the extended effects of running
> > >>really
> > >>> >> >high
> > >>> >> >DCs on injector drivers?.
> > >>> >> >Just thinking, out loud.
> > >>> >> >Just with all the hours of running stuff here, I can't find any
> > >>real
> > >>> >> >reason
> > >>> >> >for for the 85% DC, as applied to a street car.
> > >>> >> >Just maybe do to worry about a worse case thermal situation,
> > >and
> > >>> >portecting
> > >>> >> >the devices?.
> > >>> >> >Or maybe just a ol wifes tale....
> > >>> >> >Bruce
> > >>> >> >
> > >>> >> >
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