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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 ) |
Originally Posted by BurntOrangeT2
(Post 11061731)
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.
No BAC valve |
Originally Posted by Aaron Cake
(Post 11062328)
Sounds like your idle map is too rich.
And this is a large part of it as well. 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.
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Originally Posted by Aaron Cake
(Post 11063539)
You'll likely need to tweak the water map a but during warmup.
Thanks |
why hasn't anyone used the auxiliary out for an idle control solenoid yet?
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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.
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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.
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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 |
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