Low load tuning help
 

I'm trying to clean up the idle a little bit at the low load (free rev) sections to get a feel for how the microtech LT12 works before I move on to cruise adjustments.

car 88 GT3574 550 primaries 1650 sec

1) I can tune the idle to about 13.5:1 any more than that and AFR doesn't seem to move or at least fast enough and then it dies. So I put it around 12.9-13.1 ish. I'm good here.

2) Moving onto low load in N rev 1500, 2000, 3000, 4000. I see I'm in the ~ -18 load bank but no matter what I do under the load map it does not seem to change from 11.4 AFR and you can hear it miss a little bit. If I go to mix trim and take fuel out across the board I find 1500 likes -5%, 2200 likes -18%, 3000 likes -18% and 4000 likes +5%. How come I can get a significant change in AFR and run quality using mix trim but can't seem to move it with the load screen? Obviously this is adjusted somewhere I just cannot find where.

It appears you are in Matrix mode?

MixTrim is evil, don't use it. :)

Is your TPS set correctly? If it is wrong, you may be reading off of the idle map.

No Aspec tunned the car using normal mode.

I like using mix trim to quickly see if it wants more or less fuel. Not the right approach?

TPS seems right on. As soon as I get into the throttle a little bit to bring up the RPM the status box goes from idle to -

Here is my map if it helps.
Again I'm trying to get control of the low load/idle mixtures. Timing at idle is 22*
Cruise mix is the next step


Setup
Maps Normal
Load Map
RPMwot 2 "hg
RPMcru 18 "hg
AF_ste 5 %
Revstg 2950 RPM
MapStg 4 PSI
%stg 99 %


Pumps
Pump1AMT 10 %
Pump1pulse 2
Pump2AMT 30 %
pump2time 10
pump2trig 16
pumpcold 0

Condition Idle Load
30"hg 1.24 1.38
24"hg 1.29 1.29
18"hg 1.29 1.38
12"hg 1.57 1.81
6"hg 2.95 2.57
0hg 3.86 4.1
2psi 0 5.1
4psi 0 5.38
8psi 0 5.38
10psi 0 5.71
14psi 0 6.05
16psi 0 6.57
18psi 0 7.05
20psi 1 7.57
24psi 1.76 9.67
28psi 2.56 10.05

RPMwot RPMcrs
500 0 0 %
1000 0 -4 %
1500 0 -4 %
2000 0 -4 %
2500 0 -4 %
3000 0 -4 %
3500 -3 -4 %
4000 -6 0 %
4500 -6 0 %
5000 -4 0 %
5500 -4 0 %
6000 -3 0 %
6500 1 0 %
7000 3 0 %
8000 4 0 %
9000 4 0 %


watermap crank
124c 0 0
99c 0 6
82c 0 7
68c 8 10
60c 12 12
46c 15 14
38c 20 17
31c 30 21
24c 35 27
18c 45 39
11c 50 50
5c 54 60
-1c 58 69
-09c 60 76
-17c 70 80
-25c 0 85

What is your fuel pressure? If it's too high, you might not be able to get those primaries low enough with a 99% %Stage.