Custom Operating Systems [Archive]

Can I swap a segment if I have a custom operating system? (1 replies)
cos5 semi-open e85 (1 replies)
LS1B 1bar SD COS (23 replies)
P59 COS3 04073003 flex fuel issues (24 replies)
Turbo ls breakup/flutter/ bouncing boost gauge (12 replies)
HELP! FEQ_AES_DMA is adding fuel? (2 replies)
Looking for COS and starter tune for Gen1, '411, SD, cable throttle (4 replies)
Questions AutoVE Tuning my first turboed engine custom os #3 LS1B (24 replies)
COS question for LS1B (4 replies)
complete noob needs help opening a .tun file (8 replies)
complete noob needs help opening a .tun file (1 replies)
Need Help with Excessive Timing Retard in Boost - COS3 (2 replies)
Os 04073005 (15 replies)
2003 LS1B 0411 COS3 loss of Timing when under boost (6 replies)
Since GM tuning is ending... (18 replies)
Upgrading to COS E40 ECM (8 replies)
2005 Silverado Installing ethanol content sensor (16 replies)
COS5 N2O Timing Table Activation Limits (5 replies)
LS1b semi-closed loop operation question (B3647) (8 replies)
Do I have to have a commercial license to upgrade OS? (20 replies)
Which OS for my application? LS1B procharged... (7 replies)
Cruise control DBW 03190003 OS (1 replies)
3Bar for 03 Suburban file, MAP scanner values are stuck at 105 kpa (2 replies)
converting cos5 .tun to .ctz (2 replies)
Went to a 2 bar, now the trans line pressure is maxxed out (7 replies)
segment swap in COS5 (26 replies)
High spark and knock after COS3 install (11 replies)
how to update the VE map to cutom 2-3 bar table (38 replies)
E40 cos (2 replies)
Holden vz ls1 cos (1 replies)
cos3-b3618/b3647 (3 replies)
Supercharged 03 Silverado 5.3L (1 replies)
Need a favor os 12212156 to cos5 (4 replies)
COS5 egr "not supported" (10 replies)
Correct way to upgrade from COS 3 to COS 5? (4 replies)
Truck won't start with cos3. Runs fine with regular file. 12587603/04073003 (4 replies)
COS for E67 (1 replies)
2 step possible blown motor 😡 (11 replies)
newbie tune (14 replies)
custom e38 os (0 replies)
STFT and SOL (2 replies)
Cos3 01270003 to Cos 5 02020005. Wont start now (19 replies)
COS 3 Lean Cruise (16 replies)
e40 2bar upgrade (1 replies)
COS #3 for 2004 silverado bricks pcm (5 replies)
Boosted truck running too rich (3 replies)
custom operating system files (11 replies)
Can someone tell me what I'm missing to get it to start? (9 replies)
COS Tutorial question... (11 replies)
COS5 Questions (6 replies)
No throttle after os swap (9 replies)
E38 COS not pulling timing (0 replies)
LS1B Custom OS (5 replies)
Custom Operating System Questions - Compatibility, viewing parameters (5 replies)
COS5 and autoVE (4 replies)
What is the best way to achieve COS5? (3 replies)
Vallet Mode/2 Step PCM pin COS5 (2 replies)
lost my license (8 replies)
COS help (6 replies)
Can I create my own custom OS? I wnat to change the OS number is posible (2 replies)
COS5, how do I setup a 2 step? (1 replies)
AFR different on 2 widebands (5 replies)
Can HPTuners alter a PCM with an EFLive COS? (7 replies)
C2909, a rather obscure parameter but cost us 2 days in COS setup........... (6 replies)
Accuracy and speed of C0S5 nitrous Adders (3 replies)
LS1 Nitrous Trigger using OEM PCM (2 replies)
Help me select a COS (18 replies)
Jenvey ITBs - COS 5 on an LS1 (19 replies)
A0016 Pulling 1.5* - 2.0* more than Commanded. (12 replies)
Co3 stft with command afr 12.00? (7 replies)
Throttle Cracker Active with Clutch In Using COS5? (0 replies)
Help, had a COS made for my car and won't idle. (7 replies)
3bar COS only logging to 255kpa (16 replies)
My pcm won't flash a cos. (12 replies)
flashing cel after cos5 (10 replies)
help with tune co3 50lb whipple (0 replies)
Help with tune - 2 bar COS3 OLSD (8 replies)
E40, 2005, 427 Corvette, running E85 and updated to the custom OS (4 replies)
E40 2 bar question (2 replies)
E40 2 Bar COS scanner to tune PID link issue (8 replies)
COS3 pin 56 question (2 replies)
Cant load COS (24 replies)
Changing from COS3 to COS5 (6 replies)
COS#5 valet switch NO2?? (0 replies)
Idle Airflow with COS5 2bar SOLSD (3 replies)
3 bar SD starting tune (0 replies)
COS3 bootblock error 12212156 (18 replies)
COS for 2007 Silverado 12613246 (2 replies)
TPS VE for idle fueling ? (6 replies)
Semi-Open Loop Questions (16 replies)
Lean Cruise with COS5? (17 replies)
Disable A0014 for Tuning? (2 replies)
G/cyl question (20 replies)
Boost VE Tuning Tips (14 replies)
Random no starts (2 replies)
COS 5 Nitrous retard for Anti-Lag (11 replies)
COS5 Turbo Questions (17 replies)
Breaking up in Boost Randomly (6 replies)
Problem installing COS3 on 12212156 (2 replies)
Custom os tuning questions (17 replies)
Just finished my COS tune and no start (56 replies)
Went from hot weather to extreme cold not truck runs like crap (3 replies)
COS Tuning Steps (1 replies)
tow haul mode 2 tunes? (7 replies)
80e will not down shift to 1st when WOT (11 replies)
COS help? (33 replies)
dbw lq4/t56 magnum swap in 93 lightning 2 bar custom os question (2 replies)
hard to start after reflash (21 replies)
Stock COS3 for Holden 9381344 OS (3 replies)
Dual stage nitrous on a COS5 (5 replies)
60e to 80e segment swap on COS (8 replies)
valet mode/2 steep rpm limiter (3 replies)
02 COS3 Invalid Checksum (7 replies)
Go back to original operating system? (15 replies)
change spark table fron grams/cyl to map (1 replies)
E38 fan rescaling ????? (3 replies)
COS5 Nitrous capability question (2 replies)
COS 04110003 Cant seem to make the "flex fuel" sensor function (12 replies)
Tried flashing COS3 after successful test, but recieved error "ACCESS DENIED"! (2 replies)
Cos full flash (6 replies)
2 bar set up on a 99 k1500 (15 replies)
E40 2 bar Dyn Air dropping and so is fueling and everything else (34 replies)
COS5 nitrous activation issue (9 replies)
E38 COS shifting? (1 replies)
408 stroker stalls when coming to a stop (2 replies)
I have the oddest combo possible..... (2 replies)
Desired airflow COS3 (16 replies)
Custom I/O software logic (4 replies)
E38 Boost + AFM/DOD (12 replies)
E38 Pontiac G8 COS? (3 replies)
2002 Camaro COS5 2/3 BAR MAPS? (3 replies)
Custom operating systems and crankshaft relearn? (3 replies)
Limits for Cos 5 (1 replies)
Any new Custom OS OP's out there? (3 replies)
cos 5 timing going to 0 at high rpms (26 replies)
First time COS upgrade, lost. (12 replies)
Help stuck in dead poll! (4 replies)
A0007 with Calc VE? (1 replies)
"Going Mafless" in COS Tutorial? (7 replies)
Is there a COS available? (4 replies)
PCM OS upgrade is there any benifit??? (4 replies)
COS5 questions (4 replies)
E40 2bar! (9 replies)
2000 to 2002 OS to COS sanity check questions (12 replies)
how do I go back to gm os 12212156? (4 replies)
What COS should I use?? (6 replies)
Back to stock? (19 replies)
COS3 and lean cruise???? (1 replies)
Need a COS to start with (0 replies)
511.99 ? (10 replies)
Full flash after fixing OOR cells? (3 replies)
Help with tune adjustments (58 replies)
COS 5 Help Needed Here...Please (41 replies)
COS Newbee needs a little help (11 replies)
E40 Boost VE tablevalues disappear after flash... (7 replies)
Cold start, IAT, ECT question. (5 replies)
N20 Monitor VE Muiltipler A0015 (1 replies)
TPS VE Table (9 replies)
B3647 Semi Open Cell Interpolation and cmnd AFR (2 replies)
2003 c5 n20 cos (6 replies)
2006 Silverado Turbo. . Really need a COS. (1 replies)
p1221 reduce power mode (11 replies)
COS#5 Car runs bad (3 replies)
No COS fuel trim, what did I fat finger (6 replies)
First time user, help needed flashing COS (4 replies)
Working on a custom operating system without having pcm handy. (2 replies)
WB 02 doesn't follow commanded AFR (9 replies)
map sensor 12615136 reading (4 replies)
COS3 Map calibratin (2 replies)
CO3 Speed density 2 bar temperature modifiers? (0 replies)
smoother idle (0 replies)
Custom OS not showing up after full reflash (11 replies)
99 to 02 to COS5 (8 replies)
COS on jetboat (3 replies)
Why not use MAF for entire RPM range? (24 replies)
MAFless Full pressure (2 replies)
4l80 swap for custom operating system (16 replies)
Full Flash and requirement to isolate from the Class-2 network (5 replies)
98 2 bar custom OS (8 replies)
Can't edit COS (7 replies)
COS for VZ 1MB PCM (2 replies)
Advice Please (12 replies)
2 BAR COS on E40 LS2 (9 replies)
COS 3 Question (4 replies)
99 truck to OS12212156 (2 replies)
switched from COS 3 to COS 5 now reduced power mode (1 replies)
Great results using Alternate Fuel operating system (6 replies)
B4001 question (5 replies)
Lean AFR Problem (5 replies)
crank angle sensor error (2 replies)
stft (your input) (6 replies)
Looking for a 12212156 file (3 replies)
OS upgrade... from 12593555 (44 replies)
Can't get this right (49 replies)
custom os question. (3 replies)
COS3 Idle no run ?? (21 replies)
COS3 fueling issue under boost (4 replies)
COS 3 timing question (11 replies)
I need a custom OS to make my M6 shift faster (7 replies)
Custom OS List (3 replies)
wideband 02 in closed loop (18 replies)
COS 5 Fuel VE multiplier (8 replies)
COS-3 Can I Temporarily Enable LTFT? (4 replies)
Custom o.s#5 (2 replies)
Is there a COS for a 98 pcm yet? (5 replies)
06-07 cos (1 replies)
Custom operating system (13 replies)
Pe (11 replies)
STFT Idle (1 replies)
V2 asking for license again (23 replies)
N2O fueling.. ONLY VE? (1 replies)
clarification on semi closed loop SD (2 replies)
timing questions with COS 0202001 (0 replies)
Flex Fuel for LS1 (15 replies)
Still Pinging (14 replies)
'99 to '02 OS Upgrade issues (4 replies)
STFT and LTFT tuning (1 replies)
I paid for EFLIve, why can't I flash COS3? (20 replies)
Ls1 pcm running electronic throttle (6 replies)
Spark Advance vs. Gear or MPH (5 replies)
Error message? (10 replies)
How about a mph/retard? (7 replies)
0202005 is based on what OS? (4 replies)
custom 5 limiter kicking in (10 replies)
b5915 (1 replies)
02020003 with 0411 will not go semi-open loop (5 replies)
A0001,A0002, and C3003 out of range? (1 replies)
411 computer and custom OS, no flash... (3 replies)
Lean cold start COS3. (0 replies)
idle problem (1 replies)
Can you load a cal into a COS without an ECM? (0 replies)
COS 3 or COS 5 for 2000 Corvette? (2 replies)
COS 5 Question.. (14 replies)
COS 3 Help Please (2 replies)
M6 to 60e swap with COS3 & SD (0 replies)
b5915 (2 replies)
COS3 popping into closed loop even though I'm not commanding 14.68 (4 replies)
COS5 available for this OS? (4 replies)
COS 5 question (2 replies)
97 PCM to cos (5 replies)
reduced engine power can't be shut off (2 replies)
Problem with COS 5 (12 replies)
Car is running VERY rich all of a sudden (39 replies)
4l80e segment swap!!! (1 replies)
Pulling Timing - No idea why (7 replies)
lean low rpm??!! (13 replies)
cruse afr (1 replies)
WTF....i want a COS5 (33 replies)
cos3 semi closed loop (35 replies)
Do I need the Speed Density COS? (3 replies)