TPS & MAP setting on aftermarket EFI system

Dave Edge edgedj at yahoo.com
Tue Jan 8 19:05:45 GMT 2002


Hi Huw,

sounds like a great solution to the problem, use the
map values to setup a nice economical fuel delivery
and then fine tune WOT to produce a slightly rich
mixture for more power.

The main drawback from my system is that there isn't a
16x16 grid for speed versus load. There are just three
columns, one for tps, one for map and one for speed.
So it's not possible to say produce a lean spot at
70mph and a light throttle for the motorway. that may
not be such a drawback as my little 930cc engine is
highly intolerant of weak mixtures anyway even with
the throttle nearly closed. I imagine this to be
because a proportionally weak mixture on such a small
total fuel volume results in not enough energy to
propel a car forward, whereas with a bigger engine a
weaker mixture still holds enough fuel energy to
trundle along.

The ecu I've got certainly has very few whistles and
bells and has a fairly limited scope. Still what it
does do, it does very well and for £140 all in with
all sensors it ain't bad.

Cheers
Dave


 --- Huw Scourfield <huw.scourfield at lineone.net>
wrote: > Dave, not sure if I read this right but if
you're
> trying to set up a system
> with a 4d map you'll have one hell of a job, not
> even sure how this would
> work. What I would recommend is what I think you're
> suggesting, set it up on
> MAP alone (expect max fuel times @ peak torque,
> roughly), and once the
> steady state running is favourable then look at
> accell fuelling with the
> TPS. Some EMS have a "blend" facility where you can
> move the strategy from
> map to tps at a certain point in the rpm scale,
> don't know if this is yours,
> but MAP only would be a good starting point. You
> really only want to use the
> tps where the map sensor is ineffective, maybe near
> WOT, snap accelleration,
> other? Let us know,
>     Huw
> ----- Original Message -----
> From: Dave Edge <edgedj at yahoo.com>
> To: <diy_efi at diy-efi.org>
> Sent: 06 January 2002 22:56
> Subject: TPS & MAP setting on aftermarket EFI system
> 
> 
> > > > 5 Map would be my choice for accuracy and
> > > response, espcially for a low
> > > tune
> > > > engine.Tps can be used also, for accell
> fuelling
> > > alone.
> > > >     Huw
> >
> > Hi All,
> >
> > It's been a while since I last posted, simply
> because
> > I hadn't got my efi system working then. Now I
> have
> > but am on a massive learning curve with tuning.
> >
> > I have a tps and map system and was very
> interested to
> > read Huw's comment about tps for fuel pump
> only(see
> > above) about using the tps for accel fuelling
> alone.
> > Does this mean I should put all 0s in my throttle
> > column for my EFI setup. The ECU I have doesn't
> have a
> > 256 value grid for fuel values so it's
> particularly
> > difficult to setup as altering one of the three
> fuel
> > values (tps,speed and map) has a kind of four
> > dimensional effect on the setup!
> >
> > I can set the engine to idle but it runs hideously
> > rich at the top end(the lambda sensor shows 1v at
> > anything other than 0 throttle). To begin to
> counter
> > this, I have been using an idle figure of 52 which
> > tails off to 40 with more revs. Is this normal? I
> was
> > lead to believe by every book I encountered that
> the
> > fuel should rise towards peak torque (3400rpm).
> >
> > Does anyone have any tips on tuning such a setup?
> > should I start resloping the MAP curve, this would
> > allow more fuel at high vacuum (the engine idles
> at a
> > nice steady 0.23 bar) which would not increase as
> much
> > as current (currently the map scale is exactly
> > proportional to manifold pressure, so at 0.22 bar
> the
> > system puts out 0.22x52=11.44 fuel) or should I be
> > zeroing the throttle values or sloping them in
> some
> > other way???
> >
> > Anybody ever seen fuel maps setup like this
> before?
> >
> > If you copy and paste the following text into
> notepad
> > it will make sense.
> >                         Fthr        Frpm Irpm
> > Famp  Iamp       FengT
> >  Throttle:  10 %  Thrt ......   RPM ...........
> > AMP............   C  ......
> >       AMP:  0.32 B  99 .  10 .  7400. 40 . 33 .
> > 2.51.2.50 .-12 .   130.  0 .
> > Eng.Temp.:  95 .C   93 .  10 .  6400. 40 . 33 .
> > 2.26.2.27 .-12 .   120.  0 .
> >       RPM:  2078    87 .  10 .  5500. 40 . 33 .
> > 2.10.2.09 .-12 .   110.  0 .
> >      Fuel:  14      81 .  10 .  4750. 40 . 33 .
> > 1.95.1.95 .-12 .   100.  0 .
> >  Ignition:  25      75 .  10 .  4100. 40 . 33 .
> > 1.79.1.80 .-12 .    90.  0 .
> >                     69 .  10 .  3530. 40 . 33 .
> > 1.63.1.63 . -9 .    80.  0 .
> > Cylinders:   4      63 .  10 .  3050. 43 . 28 .
> > 1.48.1.48 . -6 .    70.  0 .
> > Rpm (F=0): 9766     57 .  10 .  2600. 43 . 25 .
> > 1.32.1.31 . -4 .    60.  0 .
> > AccDetect:   2      51 .  10 .  2260. 43 . 20 .
> > 1.16.1.16 . -2 .    50.  0 .
> >  Acc Fuel:  20      45 .  10 .  1950. 43 . 19 .
> > 1.01.1.01 . -1 .    40.  0 .
> > Inj. Open:  1.0 ms  39 .  10 .  1680. 47 . 19 .
> > 0.85.0.85 .  0 .    30.  0 .
> > Inp. Pol.:   0      33 .  10 .  1450. 50 . 18 .
> > 0.69.0.69 .  0 .    20. 10 .
> > Rpm Limit: 10000    27 .  10 .  1250. 52 . 18 .
> > 0.54.0.55 .  2 .    10. 10 .
> > Start Inj: 255      21 .  10 .  1075. 52 . 18 .
> > 0.38.0.38 .  4 .     0.  2 .
> >            255      15 .  5  .   930. 52 . 18 .
> > 0.23.0.23 .  6 .   -10.  2 .
> >            255       9 .  0  .   800. 60 . 35 .
> > 0.17.0.17 .  8 .   -20.  2 .
> >
> > Cheers
> > Dave
> >
> >
> > > > 5 Map would be my choice for accuracy and
> > > response, espcially for a low
> > > tune
> > > > engine.Tps can be used also, for accell
> fuelling
> > > alone.
> > > >     Huw
> >
> >
> > __________________________________________________
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