Dragstrip Plus

Sat Oct 7 18:06:33 GMT 2000

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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>