I have a concern about idle.

S4 T2 block
Lt10S
large streetport
BNR stage 4 turbo
Stock T2 Coils
550 Primaries
1600Secondaries Parallel Fuel rails



My problem is that the RPM at which my car idles at is dependent on temperature

For instance my car idles close to 800-1K RPM's from 100* - 165* but when the electric fan kicks in it will idle constantly around 1200-1400 RPM's at 175* or more.

Is there a reason for this?

No BAC valve

Maps below

http://i451.photobucket.com/albums/q...416_220511.jpg

http://i451.photobucket.com/albums/q...416_220507.jpg

http://i451.photobucket.com/albums/q...416_220504.jpg

http://i451.photobucket.com/albums/q...416_220501.jpg

http://i451.photobucket.com/albums/q...416_220457.jpg

http://i451.photobucket.com/albums/q...416_220454.jpg

http://i451.photobucket.com/albums/q...416_220451.jpg

http://i451.photobucket.com/albums/q...416_220446.jpg

http://i451.photobucket.com/albums/q...416_220441.jpg

http://i451.photobucket.com/albums/q...416_220431.jpg

http://i451.photobucket.com/albums/q...416_220427.jpg

http://i451.photobucket.com/albums/q...416_220422.jpg

http://i451.photobucket.com/albums/q...416_220417.jpg

Any other info needed let me know

Thanks

 

microtechs have no voltage compensation map
,, so if you have a marginal alt,, ( or in the case of s4's ,, marginal B+ wiring as well )
and you put all the current draw on ( lights and fans )
then you drop the voltage avail at the injectors,, which increases their lag time,, and leans your mixture a bit

and so,, when you are fully up to temp,, the fans kick in and thus lean out the mixtures just a little
and so your engine idles fast,, cause it is actually a little over-rich from the map

( or,, more correctly fans and lights may have been on when the tuner set up the initial idle )

 

Sounds like your idle map is too rich.

And this is a large part of it as well.

 

If i remove fuel from my idle map, do i have to compensate in my water map?

I slowly started to realize this, but when i ordered it i had no idea it didn't come with the BAC option standard.....

 

You'll likely need to tweak the water map a but during warmup.

 

Alright, I'll give it a go.

Thanks

 

why hasn't anyone used the auxiliary out for an idle control solenoid yet?

 

I'd love to, but in my case Microtech told me my ECU was too old to have that option enabled. Strange, because my LT8s was purchased about 12 months after the original release. Without the BAC function active, it's just an on/off output and low current, so either a relay or external circuit would be needed to activate a BAC valve.

 

yeah, i figure it wouldn't give a good duty cycle reading with these brain dead units but at least trip a relay at idle throttle poisition to open an idle solenoid valve to kick up the RPMs a few hundred.

 

here's my map in normal view i guess. Need help on what screen to adjust for leaning out crusing afr's......



Idle
Screen 1

30" Hg ... 1.19
25" Hg ... 1.24
20" Hg ... 1.24
15" Hg ... 1.24
10" Hg ... 1.57
05" Hg ... 1.57
00" Hg ... 1.86

Load
Screen 3

30" ... 0.95
25" ... 1.19
20" ... 1.52
15" ... 1.71
10" ... 2.19
05" ... 2.81
00" ... 3.38
2psi ... 2.81
4psi ... 3.29
6psi ... 3.67
8psi ... 4.10
10psi ... 4.48
14psi ... 4.81
16psi ... 5.14
18psi ... 5.43
20psi ... 5.95

RPMwot
Screen 17

0500 ... +00%
1000 ... +00%
1500 ... +00%
2000 ... +00%
2500 ... +00%
3000 ... +00%
3500 ... +00%
4000 ... +00%
4500 ... +02%
5000 ... +03%
5500 ... +02%
6000 ... +02%
6500 ... -03%
7000 ... -03%
8000 ... -04%
9000 ... -05%

RPMcrs
Screen 18

0500 ... +00%
1000 ... -06%
1500 ... -07%
2000 ... -09%
2500 ... -05%
3000 ... -04%
3500 ... -01%
4000 ... +00%
4500 ... +00%
5000 ... +00%
5500 ... +00%
6000 ... +00%
6500 ... +00%
7000 ... +00%
7500 ... +00%
8000 ... +00%
9000 ... +00%

Pump
Screen 19

Pump1 Amt ... +15%
Pump1pulse ... +4%
Pump1Trig ... +10%
Pump1Stop ... 00"Hg
Pump2Start ...2500
Pump2Amt ... +30%
Pump2Time ... +10
Pump2Trig ... +16
Pump2Stop ... 00"Hg
Pump1ADV ... +5
Pump2ADV ... +0
Pump Dwell ... 3.25
Pump Timers ... NO
Pump1 Sync ... NO
Pump Spare ... +00%
Pump Cold ... +05%

Water
Screen 20

124 C ... +00%
99 C ... -02%
82 C ... -03%
68 C ... +03%
60 C ... +07%
46 C ... +14%
38 C ... +14%
31 C ... +22%
24 C ... +30%
18 C ... +34%
11 C ... +42%
5 C ... +47%
-1 C ... +50%
-9 C ... +60%
-17 C ... +70%
-25 C ... +00%

Air_t
Screen 21

124 C ... +00%
99 C ... +00%
82 C ... +00%
68 C ... +00%
60 C ... +00%
46 C ... +00%
38 C ... +00%
31 C ... +00%
24 C ... +00%
18 C ... +03%
11 C ... +03%
5 C ... +04%
-1 C ... +05%
-9 C ... +06%
-17 C ... +08%
-25 C ... +00%

Crank
Screen 22

124 C ... -71%
99 C ... -07%
82 C ... -08%
68 C ... -09%
60 C ... -11%
46 C ... -12%
38 C ... -52%
31 C ... -36%
24 C ... -18%
18 C ... -10%
11 C ... -04%
5 C ... +30%
-1 C ... +39%
-9 C ... +72%
-17 C ... +72%
-25 C ... +72%

t* rpm
Screen 23

Idle ... +16
1000 ... +16
1500 ... +19
2000 ... +21
2500 ... +26
3000 ... +26
3500 ... +25
4000 ... +25
4500 ... +25
5000 ... +25
5500 ... +25
6000 ... +25
6500 ... +25
7000 ... +25
8000 ... +25
9000 ... +25

t*map
Screen 24

20 psi ... -17
18 psi ... -16
16 psi ... -15
14 psi ... -14
10 psi ... -13
8 psi ... -10
6 psi ... -07
4 psi ... -05
2 psi ... -02
00"Hg ... +00
05"Hg ... +01
10"Hg ... +02
15"Hg ... +03
20"Hg ... +04
25"Hg ... +05
30"Hg ... +00

t*air
Screen 25

124 C ... +00%
99 C ... +00%
82 C ... +00%
68 C ... +00%
60 C ... +00%
46 C ... +00%
38 C ... +00%
31 C ... +00%
24 C ... +00%
18 C ... +00%
11 C ... +00%
5 C ... +00%
-1 C ... +00%
-9 C ... +00%
-17 C ... +00%
-25 C ... +00%

t*gap
Screen 26

0500 ... +15
1000 ... +15
1500 ... +15
2000 ... +14
2500 ... +12
3000 ... +10
3500 ... +10
4000 ... +10
4500 ... +10
5000 ... +08
5500 ... +07
6000 ... +07
6500 ... +07
7000 ... +07
8000 ... +07
9000 ... +07

t*Inj
Screen 27

0500 ... 120
1000 ... 150
1500 ... 150
2000 ... 150
2500 ... 150
3000 ... 150
3500 ... 150
4000 ... 150
4500 ... 180
5000 ... 210
5500 ... 210
6000 ... 210
6500 ... 210
7000 ... 210
8000 ... 210
9000 ... 210

t* wat
Screen 28

124 C ... +00
99 C ... +00
82 C ... +00
68 C ... +00
60 C ... +00
46 C ... +00
38 C ... +00
31 C ... +00
24 C ... +00
18 C ... +00
11 C ... +00
5 C ... +00
-1 C ... +00
-9 C ... +00
-17 C ... +00
-25 C ... +00

Option
Screen 29

Opt #1 ... off
Opt #2 ... off
Opt #3 ... Aux FAN_on 67* C/46* C
Opt #4 ... Aux FANadd 0.10
Opt #5 ... Aux FANAIR 0.10
Opt #6 ... Aux AIRmin 10.00
Opt #7 ... Aux AIRmax 10.52
Opt #8 ... Aux AIRwat 0.48
Opt #9 ... Aux AIRafs 0.10
Opt #10 ... Aux RPMset 0880
Opt #11 ... AUX pwmLOW 0.76
Opt #12 ... Aux pwm_HI 7.62
Opt #13 ... Inp RPMlim off
Opt #14 ... Inp AIRadd 0.19
Opt #15 ... Inp Enrich 0.00
Opt #16 ... Inp Timing +05%


Option
Screen 30

Opt MIXtrm +00%
Opt TPScal +17%
Opt TIMtrm +01%
Opt Static +00%
Opt TIMmax +38
Opt RPMwot 02"Hg
Opt RPMcrs 14"Hg
Opt AF_ste +04%
Opt REVlim OFF
Opt REVcut OFF
Opt BstCUT OFF
Opt REVstg 2500
Opt MAPstg 00psi
Opt %stg +99%
Opt Decel 26"Hg
Opt Dwell 3.50

Screen 31

Config +04 Cyl/R
Firing SEQUENTIAL
LOAD = MAP Sensor
DWELL = Time base
Input Trig +POS
Spark Trig Maz+
Timing check OFF
Rpm_ON 2500 Log
Map_ON 02psi Log
Sample +00 Log
Spare +00 Log
SHIFT 7500 Dash
WATER 99 C Dash
Air_T OFF Dash
BOOST OFF Dash