- First Thread
- RePost
- Re: going to S/D tune O/S on a 99 PCM
- How do the .cals tie in with the .tun files?
- I got it... Opps I aint got it...
- Finally have the truck back... New COS #3, one problem
- Still problems with B3647 in OS3
- Progress on Cust OS w/E85 issues?
- EQ or AFR
- ecm pin outs
- upgrade OS??
- gen 1 motor with gen 3 ecu
- speed density
- Duramax tuners, see here...
- gm os to custom os
- OS3 installed
- Does this make sense?
- COS#3 ... Max MAP = 105kpa in the scanner?
- Open Loop VE IAT Multiplier Values
- going Custom OS
- Semi-Open Loop Vs Just Open Loop
- Help with IAT issues in SD, Open Loop
- Hmmm. Boost VE and 2nd fuel pump on a Hobbs
- idle fuel efficiency?
- Strangeness with open loop idle lean limit (B3607)
- 2step Timing Based vs Fuel
- New to Custom OS's
- Can someone explain why the '01 and '02 ls1s are better?
- Open Loop Fuel Economy Results
- Tow / Haul
- has anyone had vtd problems after bench flash of costom os
- B3641's usefulness with New Operating System
- can anyone please help me out with tuning...?
- Custom O.S V5 gets a run
- 98 PCM options
- Not entering PE Mode
- next custom os release (external switch...)
- any boosted corvette A4 guy here?
- Custom OS 4 and 5
- Question about semi-open loop and boost/meth
- Show me your A0014's
- Build Boost While Staging
- Valet Mode
- Valet mode finally
- 98 2 bar custom OS
- Installing Custom OS
- custom operating system for 2002 avalanch 12216125 ecm
- Question about Speed Density and dual spark map
- Spark modifier, any use?
- looking for big help with tuning an extremely large cam in my ls1
- custom os and nitrous
- Nitrous Survey
- HP tuner inhanced SD vs efi live.
- Table Names vs Table Number
- Custom OS#5
- Long Term Trims
- Spark Boost retard table
- Personal vs Commercial
- Maf and custom op. sys. 3
- Tune in SD or with the MAF
- setting ve tables
- can you hlp me plsss ???
- Replacing MAP 2002 Vette
- Custom OS B5956
- custom os back to stock
- IAT VE Multiplier - multiplies Boost VE tables also?
- SD tune
- would this be hard
- STFTs very rich after Custom OS tutorial
- Multiple problems after '03 Custom OS upgrade on truck
- Feature Request: Tip-in enrichment
- b4205 and b4108 settings after cust OS tutorial
- Question on logging AFR
- upgrading OS3 to OS5 using Roadrunner
- Custom OS B6619
- Os#12605114
- Car Dies With A/C On
- Custom OS to OS#5
- Tuning a 8TB manifold 383 with big cam
- Returning and starting tuning in Semi open loop SD mode
- 2Bar OS and Readiness Tests
- Tuning idle transition with OS5
- 07 suburban
- 2005 Custom OS3 in a 2006 Truck?
- Dual spark maps, let me get this straight????
- Update to the Camaro 02 OS 12212156
- Lean Cruise 2002 Vette
- Need a COS5 120205 Tune.
- COS #5 what am i doing wrong!!!
- Custom OS, now no PCM comm's
- COS5 Question????
- New here...I think i have a helpful write up for an OS swap...
- COS Idea. Cylinder Balance percentage.
- Os Faq
- 99 -> 02 OS upgrade questions
- Which PCM connector for valet wiring?
- Need help SD
- Personal to Commercial required?
- ETC question for Ross/Paul (and anyone else who knows ;))
- Which OS?
- Upgrading from 2k OS
- A0008 OL ECT Command Fuel Multiplier
- Commanded AFR stuck at 12.53 after warmup
- How do 98's fit in?
- reflash operating system
- Maybe stupid questions ...
- I have a 1998 Camaro..
- OS5 TPS VE Table setup?
- Strange MAF&MAP tune issue...
- Custom OS went screwy?
- AutoVE not working - SOS!
- wide band o2
- Opps, Need Emission Test
- B3647 Question??
- Newbie OS Question
- N20 Switch wiring with OS5.
- Reading PCM
- Full Reflash
- Tutorial
- B6245 and B5911 Units ???
- Custom OS#5
- Why doesn't SAE.MAP not work? (2-bar)
- 2 bar MAF with custom O/S??
- Problem with 04 Vette and speed density (ETC?)
- Another issue with C5 SD tune..
- lean cruise in OS3
- 04140003 VZ Custom Op
- COS5 shuts the engine down after 3 seconds...help!
- Changing the scaler number in COS5 doesn't change the key on engine off map reading??
- limp mode
- Weird Problem
- COS5 question on STFT's
- COS #3 to COS#5
- Thanks to Black02SS, my EFI Live COS5 sd tune is running great!
- Weird AFR at idle
- Custom Os???
- help ????? 2000 to os5 and maps off wack
- Dual Spark Maps - Difference ?
- Copy and Paste
- Custom operating systems for 2006 models
- COS3 cold lean startup solution
- Forced octane scaler
- Custom O.S #3 Update for 2003+
- COS idea
- New COS3c Problems
- COS5 with 60 lb injectors
- Lean spikes commanded vs actual AFR
- Service Number 9354896
- COS types and abilities?
- Looking for help, having some VE tuning trouble
- OS files
- 2003 Vette twin turbo done with OS3
- COS for E40 and fans
- Where did all the COS go?
- Auto VE setup with CO 3
- charge temp blending
- cos 5 with trans brake and n2o
- Stuck from the beginning (as usual)
- Anyone disconnected their front O2's after open loop programming?
- custom operating system nos
- 98 Custom operating system...
- timing map
- COS#5 help
- No Communication After Reflash?
- Accel enrichment
- Injector Flow Rate question
- B3647 = A0008 ???
- starts for 1 sec and then dies
- 3 bar help
- Valet Problems
- Loging A0009
- E40 Valet mode?
- B5908
- Co#5
- Boost Timing Table
- 7.4.2 Cos
- 2005 Cos3
- Loaded Custom OS: 03Z06..starts/dies after 1 sec
- Trouble loading 2002 OS in 1999 PCM
- Compare feature
- Car reduced power mode/dies after idling with A/C on for a bit
- Dfco
- Cos 2
- Service vehicle light with custom os?
- 2004 gto pcm connector colors...
- A0011 out of range...
- Custom OS Locking Ability
- How to combat IAT swing?
- Knock after COS #3 install, but never had knock before
- Rich cruise in COS5
- Need some help with a few issues: tune inside
- Need a little help gettin started on COS3 fine tuning. Please
- COS 5 and Auto VE Tuning Question
- Slightly OT: where to put the Valet switch?
- A0014
- COS 04140003 lean problem
- COS for 2006 OS
- 2 step
- where do I download COS#5
- 2004 Monaro PCM
- B0109
- stuffing a 512kb os in a 1mb os...
- No GM PIDs and no VIN with COS3
- How do you log misfires in COS5?
- Can't flash to COS!?
- nos
- OS#09381344 to COS5 ?'s
- OPEN-LOOP based fuel control in Cos 3...question.
- HP Tuners Custom OS for Real Time Tuning compared to EFILive RTT?
- COS3 out of range calibrations
- B4005 Small Pulse Adjust How does GM create this table?
- COS5: Difference in A0008 and B3632?
- semi closed loop
- lean wot with big ve numbers and low injector duty cycle
- Getting trans segement into COS3
- Will 12212156/COS5 run on PCM used in 2003 Z06...?
- lean not sure what i am missing
- Is there a tutorial for changing your OS to a newer one?
- COS3 and COS5 lean cruise PE Mode AFR error
- Help: Loaded a COS but can't load Cal
- How do you change the VIN when upgrading to a newer OS?
- Spark Retard
- Start up A/F's
- COS5 With A 2 Bar Map Sensor Question
- COS#5 for 2004 silverado
- Which maf fail numbers are you using for C2907 and C2908?
- COS5...which table controls the commanded AF <100F ECT at start?
- Math for the VE multiplier
- Ship Shift
- Upgraded to COS3 and have problem......
- Can anyone help with a couple of problems?
- car wont start with COS#5
- cos3 in o4 vette
- 2004 GTO (OS 12587604) COS options
- moving to co3
- help with COS5
- os3 in 02 zo6 timing problem
- Can You Guys shed some light on this for me...............
- Custom OS on 0411 PCM for L31 Vortec?
- Boost VE map...............
- What OS To Use?
- Could you Guys Please look at my tune.............
- can't get BEN filters to open
- looking for recommendation...
- post up COS5 tune files
- P1516 - Custom OS 02612557 E40
- 0411, marine intake and 4L80E
- LS2 E40 2 Bar Custom OS
- Formal Request for COS5 for 1MB PCMs (04 GTO, etc)
- custom OS with efi v1