TPS & MAP setting on aftermarket EFI system

[Huw Scourfield]

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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