This discussion only pertains to tuning large than stock frame turbos. It does not apply to stock turbos, or hybrid turbos such as RB, Vargas Stage 1 or 2, ASR or TD so let's leave those out of this thread.
So, here we go, short and sweet hopefully...
Tuning with COBB to 21psi is what is currently supported in terms of max boost on I8A0S and IJE0S ROMs with alpha race code that is under development. Older MSD80 and MSD81 ROMs are limited to 18.5psi but the DME can be upgraded to the latest ROMs for them to be opened to 21psi as well. For 6ATs the Alpina TCU flash is required to push past 18.5psi and resolve certain torque intervention issues before tuning can be pushed past 18.5psi. If your car is older than 03/07 we're unable to currently tune your car reliably because of its older transmission computer.
If you're a 6MT or a 6AT with an Alpina TCU flash and running a fully custom aftermarket large turbo (turbos) kit, not one of the ones mentioned in the beginning, you'd be inclined to push boost higher and so would we. With Cobb right now the 21psi limit is currently in place and it won't budge until resolved. I don't know when it will be raised. I do know it is being worked on and it will come eventually.
In the meantime, we need to find a suitable external boost controller that doesn't hijack the CANBus :)
Current JB4/Procede as boost controllers:
Both currently use CANBus integration to make boost control work the way it does. My comfort level is low to none using them currently out-of-box as they take away ability to log some of the critical engine parameters only available on the AP. We lose visibility into timing corrections/knock across cylinders 2 through 6. Relying on just cylinder 1 timing for me is unacceptable when we can simply see the whole picture when the AP is plugged in. This is also the reason today we reject tuning any cars that stack on top of Cobb for meth or what have you.
I am trying to keep things inside the DME as much as possible, preserving all the critical logging while being able to go past 21psi controllably.
From discussions with Rob Irish back when he was still with Cobb and Terry I know there's a way to move the JB4 to another CANBus node/channel to make it work along side the Cobb AP. This would allow for addressing the boost limit with the JB4 being a non-intrusive external boost controller while allowing for full visibility into the engine's inner workings that the AP so conveniently exposes.
@Terry@BMS , is a JB4 configuration of such nature possible? If not, can the JB4 be moved over so critical Cobb AP datalogging isn't lost by plugging in the JB4 and the two can work in harmony forever :) Same goes to the procede camp as procede is already on Vargas' car as his customer already owned that tune prior to getting this work done (but I think I know the answer there already).
So, here we go, short and sweet hopefully...
Tuning with COBB to 21psi is what is currently supported in terms of max boost on I8A0S and IJE0S ROMs with alpha race code that is under development. Older MSD80 and MSD81 ROMs are limited to 18.5psi but the DME can be upgraded to the latest ROMs for them to be opened to 21psi as well. For 6ATs the Alpina TCU flash is required to push past 18.5psi and resolve certain torque intervention issues before tuning can be pushed past 18.5psi. If your car is older than 03/07 we're unable to currently tune your car reliably because of its older transmission computer.
If you're a 6MT or a 6AT with an Alpina TCU flash and running a fully custom aftermarket large turbo (turbos) kit, not one of the ones mentioned in the beginning, you'd be inclined to push boost higher and so would we. With Cobb right now the 21psi limit is currently in place and it won't budge until resolved. I don't know when it will be raised. I do know it is being worked on and it will come eventually.
In the meantime, we need to find a suitable external boost controller that doesn't hijack the CANBus :)
Current JB4/Procede as boost controllers:
Both currently use CANBus integration to make boost control work the way it does. My comfort level is low to none using them currently out-of-box as they take away ability to log some of the critical engine parameters only available on the AP. We lose visibility into timing corrections/knock across cylinders 2 through 6. Relying on just cylinder 1 timing for me is unacceptable when we can simply see the whole picture when the AP is plugged in. This is also the reason today we reject tuning any cars that stack on top of Cobb for meth or what have you.
I am trying to keep things inside the DME as much as possible, preserving all the critical logging while being able to go past 21psi controllably.
From discussions with Rob Irish back when he was still with Cobb and Terry I know there's a way to move the JB4 to another CANBus node/channel to make it work along side the Cobb AP. This would allow for addressing the boost limit with the JB4 being a non-intrusive external boost controller while allowing for full visibility into the engine's inner workings that the AP so conveniently exposes.
@Terry@BMS , is a JB4 configuration of such nature possible? If not, can the JB4 be moved over so critical Cobb AP datalogging isn't lost by plugging in the JB4 and the two can work in harmony forever :) Same goes to the procede camp as procede is already on Vargas' car as his customer already owned that tune prior to getting this work done (but I think I know the answer there already).