AaYaku_FL5
Member
- Thread starter
- #1
Hello everyone, after being a massive lurker and trying to learn as much as I can I've decided to join the forum and actively participate. I have gone down the rabbit hole of ECU tuning with Hondata and figuring out how these Bosch ECU's work and have been able to tune my car to how I like it with a good power increase with reasonable levels of boost and all the safety measures dialed in.
I am interested in going aftermarket turbo at some point but had some questions regarding how this works with Hondata. To my understanding the ECU will calculate the boost pressure required to achieve the requested air charge based on the torque request. Now this air charge should be dependent on the torque modeling of the engine which would take into account the stock turbocharger turbine housing. There are tables in Hondata to redo the compressor map but there is nothing for the turbine besides some wastegate tables. Based on this how is the turbocharger modeling supposed to be changed to reflect a lower restriction due to the larger turbine?
With the stock turbo for example, I am hitting 200% Air charge at 6500rpm with a boost pressure of 21.5 psi. Now a bigger turbo at this same RPM with a target of 200% air charge would need less boost pressure to achieve this due to the bigger turbine. Am I right to assume that the ECU will still target the 200% air charge based on the stock turbo modelling and to correct this you essentially "fudge the torque request" or limit the turbo with compaction ratio tables or does the ECU target the air charge through mass air flow and will ramp up boost command until this mass air flow is met?
Any further knowledge in this area would be amazing, I'm trying to learn as much as I can, thanks for the help
I am interested in going aftermarket turbo at some point but had some questions regarding how this works with Hondata. To my understanding the ECU will calculate the boost pressure required to achieve the requested air charge based on the torque request. Now this air charge should be dependent on the torque modeling of the engine which would take into account the stock turbocharger turbine housing. There are tables in Hondata to redo the compressor map but there is nothing for the turbine besides some wastegate tables. Based on this how is the turbocharger modeling supposed to be changed to reflect a lower restriction due to the larger turbine?
With the stock turbo for example, I am hitting 200% Air charge at 6500rpm with a boost pressure of 21.5 psi. Now a bigger turbo at this same RPM with a target of 200% air charge would need less boost pressure to achieve this due to the bigger turbine. Am I right to assume that the ECU will still target the 200% air charge based on the stock turbo modelling and to correct this you essentially "fudge the torque request" or limit the turbo with compaction ratio tables or does the ECU target the air charge through mass air flow and will ramp up boost command until this mass air flow is met?
Any further knowledge in this area would be amazing, I'm trying to learn as much as I can, thanks for the help
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