Dragstrip Plus

[timsiford@hushmail.com]

Dragstrip plus reports a 1/4 ET of...

12.74@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@107.9mph).  

Changing the intake manifold to "med. rise single plane" (i.e. MiniRam) 
yields an ET of 12.61@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@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@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@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@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@hushmail.com>
>>> >To: <gmecm@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@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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