Re: still going lean

["Bruce Plecan" <nacelp@bright.net>]

> Yes the engine is in a 85 corvette 383,miniram motor.
> A ZF with 4.10s
> I would have to say thats its more sensative in any
> little quirks or stumbles overa auto car.  You feel
> every mis tune.
> I am using diacom.
> I usually keep the tps enable low say 3500up 25%.
> Car is running high 11's
> O2's look great for WOT(I know alot of guys dont like
> reading from these)
> Fuel pump is a high output bosch.
> So Are you saying may be hard or not able to tune 4000
> up above 70kpa.

depending on the motor, you can exceed the amount of fuel possible on the VE
table.  You at some point got to PE, you can move that trip point to cover
the top of the table.  Sometimes taking timing out of the RPM vs K/Pa at
over say 70 K/Pa can help cover that "hole" waiting for the PE to kick in.

> I do have diacom traces if anyone wants to take a
> look.
> So tweaking the pumpshot may help.  I really never
> tweaked with this.  I mainly run GMepr and didnt
> notice a pumpshot thru this edit prog.

In Fuel Parameters there are 3.
Bruce


>
> Thanks Dennis
> --- Bruce Plecan <nacelp@bright.net> wrote:
> >
> > > just to touch base. I converted from a 870 ecm to
> > the
> > > 7730 speed density in the spring time. All went
> > well.
> > > I was running my 24 lb injectors at first and 2
> > months
> > > ago I swapped in some 36lbr's. The 24's were over
> > 10ms
> > > above 6000. so close to static.
> >
> > So this is not a stock engine, right?
> >
> > > Well I everything was decent but I am really
> > trying to
> > > fine tune the drivabilty.  Above 4000 its going
> > lean.
> >
> > How are you determining this?
> >
> > > I set the TPS enable to 90% for all RPM rngs.s(so
> > it
> > > wont bump in open loop) .I also have the blm
> > locked in
> > > at 128.  I had my inj set to 34. wit hthis the car
> > ran
> > > decent ,WOT was right on but above 4000 leaning
> > out.
> >
> > This is the way it's going to be as long as you
> > approach WOT but staying in
> > Closed loop.  Are you running Diacom?, or some why
> > to monitor the commanded
> > AFR.
> >
> > > Now for a while I had the TPS open loop enable set
> > to
> > > like 20 % at about 3000 up so it would run good
> > but
> > > now I am trying to get it right.
> >
> > Stout engines might take a low TPS enable to get
> > enough fuel for it to get
> > along.  Remember the engine tells you what it wants,
> > and then even off the
> > edges to get the drivibility.  As a forinstance, the
> > GN also has a fairly
> > low TPS enable.  On the cross fire, I think most of
> > them were 35%.  Tune to
> > what the table allows.  On a mild engine, you might
> > be able to **tune** to
> > 90ish K/Pa..   Also want to monitor what the WOT
> > K/Pa, a restrictive
> > exhuast, and some seemingly good ones can choke off
> > the motor.
> >
> >  I went from 34 to 31
> > > and turned FP up to 50 and still goes lean the
> > INT's
> > > go up above 150.  My VE tables are maxed out up in
> > > this area as well.
> >
> > Might just be out of Fuel Pump.
> >
> > > I though going from 24 to 31 injector would be
> > alot
> > > but maybe not . Should I go down another 2 counts.
> > I
> > > saw in cats thers a pumpshot value , Is this sort
> > of
> > > like a accel pump?
> >
> > Exactamundo
> > Bruce
> >
> >
> >   Any  sugestions??
> > > TIA
> > > Dennis
> > >
> > > =====
> > > Dennis Zacek
> > > http://geocities.com/bowtie8
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Yahoo! Mail - Free email you can access from
> > anywhere!
> > > http://mail.yahoo.com/
> > >
> >
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>
> =====
> Dennis Zacek
> http://geocities.com/bowtie8
>
> __________________________________________________
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