HELP - cold air problem

[Carl Summers]

Hi,
     I have seen this also...In my case the spark was the problem...I had
plenty of energy but would rather crossfire than jump the gap...I closed the
gap to .025" and prob went away...after increasing the octane and allowing
earlier timing event, gap was able to move to .030"...remember the less
advance you run the higher the cylinder pressure is when trying to light the
kernel. How are you making that kind of power with one turbo??and I am
assuming you are looking at your ET's...how is the turbo lag???I guess trans
brakes are working good for spoolup???....Is this electronic or mechanical
injection??? Before or after intercooler???? inquiring minds....blah blah
blah
-Carl Summers



-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of dennis
Sent: Wednesday, August 09, 2000 9:04 PM
To: diy_efi at diy-efi.org
Subject: Re: HELP - cold air problem


This sounds like an ignition problem to me, I could be wrong.

My thinking would be that the A/F mix is too dense at that temp for it to
ignite properly. If you lean it, it's more volatile and easier to light, but
more dangerous with the high EGT's.

What kind of ignition is on this thing?

Dennis

--- "Flanagan, Stephen CECOM RDEC STCD"
<Stephen.Flanagan at mail1.monmouth.army.mil>
> wrote:
>I am running a single turbo with a sheet metal intake.  Car has made some
>great HP to date but I have been only using an air to air intercooler.
>
>With the air/air the air charge goes from 100 deg up to about 270 deg (+/-
>20deg)
>depending on the days conditions.
>
>I had my intercooler boxed in and now have an ice-water/air intercooler,
now
>the air charge goes from 70 deg up to about 130 deg.  The car runs great
>through
>1st gear, but breaks up in high gear (2 speed automatic - powerglide).
>Spend several
>days on the track and 8 pulls on a dyno using WB02 (Horiba).  The only way
>to clean up
>the high gear was to lean it out, but the egts went way too high.
>
>Does anyone have any ideas what could be the major problem?  I am thinking
>that the
>fuel may not be atomized correctly at the colder temps, if so, what is a
>good action
>to try.
>
>I have seemed to lose around 150 hp after the intercooler change.  car was
>running
>high 7'50s, now it is running 7.70s to 7.90s.  I do not want to get rid of
>the
>cold air intercooler because I know it is worth at least 100 hp.  (Keep in
>mind this
>is on a 1500+ hp setup).
>
>TIA, Steve F
>
>----- End of forwarded message from owner-diy_efi at diy-efi.org -----
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