Holley TBI & EGR

[Bruce Plecan]

EGR is an emission thing.
I've never found an engine to run cooler with it, course only made an issue
of it two times, and gave up trying to prove that it did work.  In Theory
should improve gas mileage, just niver found any gains.  I'm sure someone
has, just wasn't me.
  You can have a closed loop system that is running at 14.7  (***remember***
that is an average), with a small vac leak and it will *feel* like a light
miss, cure the leak an all is well.
  The reason is, jus cause, IMO.  The swing rich just isn;t rich enough to
keep the temps down, and I think there is a compression ignition issue that
starts to raise it's ugly head.  Again, IMO.
  It's seems like the GM way of richer with more timing with egr on is what
has to be
Bruce




>    Holley claims that you can't run an EGR with their bolt-on TBI system
> (This is the "D" version, which is a closed loop system).  Just for the
heck
> of it, I tried activating the EGR with a vac pump and it caused what
seemed
> to be a miss, but I assume it's either a rich or lean mixture.  I'm sure
> there's a good reason that this occurs (and the O2 sensor doesn't make up
for
> it), but I can't seem to figure out why at the moment.  If someone could
> explain it, I'm sure I could fallow the reasoning. :)
>    Any insight would be apreciated.  Also, I've heard that running an EGR
> would help the engine run cooler, any ideas on this (We do some towing and
> have an over-heating problem).
>
> Chris
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