Cobb Stage 3 v4.01
Oct 12, 2013, 07:09 PM
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Cobb Stage 3 v4.01
hey guys,
Picked up a 2014 GSR back in mid august. Told myself I would keep it stock through the end of the year...
Mods
Megan DP
Depo HFC
CNT Dual N1 catback
Depo UICP
Perrin Turbo inlet
Cobb AP
Cobb 3 port ebcs
AGP FMIC
Green Filter high flow filter(stock air box)
Just loaded up the v4.01 stage 3 ACN91 map. seems to run pretty good. Been a while since I tuned a car, but from what I can tell, under high load, there is no knock and its running full timing, so that's good.
power is smooth and boost is hitting target of 26.5 tapering to 19 (but it is maxing out boost correction to hit it)
Have no idea on AFR until I get time to put my wideband in. once that happens I will be working on the fuel trims. LTFT used is +8, so I'm gonna have to work on that.
When I get some time I plan on doing a lot more logging and make some tweaks to the map.
I also plan on trying out the 4.02a stage 3 acn91 map before I get heavy into changes on the v4.01 map(if 4.02a is a better start, only makes sense to not spend too much time on the v4.01 map)
What ever changes I make, I will be sure to document and let you guys know about to hopefully help out the community.
Picked up a 2014 GSR back in mid august. Told myself I would keep it stock through the end of the year...
Mods
Megan DP
Depo HFC
CNT Dual N1 catback
Depo UICP
Perrin Turbo inlet
Cobb AP
Cobb 3 port ebcs
AGP FMIC
Green Filter high flow filter(stock air box)
Just loaded up the v4.01 stage 3 ACN91 map. seems to run pretty good. Been a while since I tuned a car, but from what I can tell, under high load, there is no knock and its running full timing, so that's good.
power is smooth and boost is hitting target of 26.5 tapering to 19 (but it is maxing out boost correction to hit it)
Have no idea on AFR until I get time to put my wideband in. once that happens I will be working on the fuel trims. LTFT used is +8, so I'm gonna have to work on that.
When I get some time I plan on doing a lot more logging and make some tweaks to the map.
I also plan on trying out the 4.02a stage 3 acn91 map before I get heavy into changes on the v4.01 map(if 4.02a is a better start, only makes sense to not spend too much time on the v4.01 map)
What ever changes I make, I will be sure to document and let you guys know about to hopefully help out the community.
Oct 13, 2013, 01:27 PM
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Thanks! 
quick little update:
tried out v4.02a car is running better. power is even smoother and it has a better idle.
Made some tweaks to the v4.02a maps that I'm gonna try out tonight.
1. added a little bit of IAT timing retard. I'm sure it was fine as is, but I personally feel that at 100 deg F / 38 deg C there should be atleast a little timing pulled, so I changed the value from 0 to -1
2. copied over the MAF scaling from a stage 2 ACN91 stock intake map. Since I still have the stock intake, it may be why my LTFT used was +8
3. increased wg duty cycle a little in the 80%+ throttle part of the map, should be able to hit target boost more consistently, especially in the lower gears
quick little update:
tried out v4.02a car is running better. power is even smoother and it has a better idle.
Made some tweaks to the v4.02a maps that I'm gonna try out tonight.
1. added a little bit of IAT timing retard. I'm sure it was fine as is, but I personally feel that at 100 deg F / 38 deg C there should be atleast a little timing pulled, so I changed the value from 0 to -1
2. copied over the MAF scaling from a stage 2 ACN91 stock intake map. Since I still have the stock intake, it may be why my LTFT used was +8
3. increased wg duty cycle a little in the 80%+ throttle part of the map, should be able to hit target boost more consistently, especially in the lower gears
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