TPS & MAP setting on aftermarket EFI system

[Dave Edge]

> > 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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