GPT says : If you remove the GPF/OPF (Gasoline Particulate Filter/Otto Particulate Filter) but don’t account for it in the ECU, a few issues can arise, some of which could affect engine performance and reliability: 1. **Check Engine Light (CEL):** The ECU will likely throw an error code because it is still expecting data from the GPF/OPF sensors. This could trigger a Check Engine Light, which may cause the car to enter **limp mode** in some cases, limiting performance to protect the engine. (Not sure this applies considering it had no sensors on there but I’m guessing sensors before and after if there was any could do?) 2. **Fuel Trims and Air-Fuel Ratio:** The ECU is designed to manage the air-fuel ratio based on the presence of the GPF/OPF. Without adjusting the ECU, the removal of the GPF might result in improper air-fuel ratios, which could lead to poor combustion, **reduced fuel efficiency**, or even **knocking** in some cases. - worrying 3. **Post-Combustion Injection:** The ECU may continue to inject extra fuel during specific conditions (like overrun on the motorway) to heat the GPF and perform a regen cycle (as you mentioned). Without the GPF, this extra fuel can lead to excess carbon buildup on the turbo or exhaust valves, which could eventually cause **sooting issues** or impact performance, especially in the long term. 4. **Increased Exhaust Temperatures:** The ECU may still manage the engine’s heat cycles with the assumption that the GPF is present. This could result in **higher exhaust gas temperatures** (EGT) during regens or hard driving conditions, which might stress the turbocharger or other components like the catalytic converter. 5. **Backpressure Changes:** A GPF creates backpressure that the engine and turbo are calibrated to work with. Removing it can alter the exhaust flow, which might improve performance slightly but could also lead to inconsistent exhaust pulses and affect turbo spool behavior. If not properly tuned for, this change could harm turbo efficiency and even cause **turbo lag** or **surging**. 6. **Potential for Sensor Failures:** The GPF system is monitored by multiple sensors (temperature, pressure, etc.). Without recalibrating the ECU, these sensors could malfunction, causing poor engine performance, inconsistent power delivery, or further triggering limp modes and fault codes. In summary, the car will likely throw error codes, and you could experience fueling, exhaust temperature, or turbo-related issues. Over time, carbon buildup could increase, and without correcting the ECU, these issues could affect overall reliability and engine health.
I've never actually seen one with the mppsk in person but a quick Google looks like they never had a centre resonator. Maybe adding a resonator back in would help? Unsure on a 100% answer to this but if your local happy to give it a shot
GPT says :
If you remove the GPF/OPF (Gasoline Particulate Filter/Otto Particulate Filter) but don’t account for it in the ECU, a few issues can arise, some of which could affect engine performance and reliability:
1. **Check Engine Light (CEL):** The ECU will likely throw an error code because it is still expecting data from the GPF/OPF sensors. This could trigger a Check Engine Light, which may cause the car to enter **limp mode** in some cases, limiting performance to protect the engine. (Not sure this applies considering it had no sensors on there but I’m guessing sensors before and after if there was any could do?)
2. **Fuel Trims and Air-Fuel Ratio:** The ECU is designed to manage the air-fuel ratio based on the presence of the GPF/OPF. Without adjusting the ECU, the removal of the GPF might result in improper air-fuel ratios, which could lead to poor combustion, **reduced fuel efficiency**, or even **knocking** in some cases. - worrying
3. **Post-Combustion Injection:** The ECU may continue to inject extra fuel during specific conditions (like overrun on the motorway) to heat the GPF and perform a regen cycle (as you mentioned). Without the GPF, this extra fuel can lead to excess carbon buildup on the turbo or exhaust valves, which could eventually cause **sooting issues** or impact performance, especially in the long term.
4. **Increased Exhaust Temperatures:** The ECU may still manage the engine’s heat cycles with the assumption that the GPF is present. This could result in **higher exhaust gas temperatures** (EGT) during regens or hard driving conditions, which might stress the turbocharger or other components like the catalytic converter.
5. **Backpressure Changes:** A GPF creates backpressure that the engine and turbo are calibrated to work with. Removing it can alter the exhaust flow, which might improve performance slightly but could also lead to inconsistent exhaust pulses and affect turbo spool behavior. If not properly tuned for, this change could harm turbo efficiency and even cause **turbo lag** or **surging**.
6. **Potential for Sensor Failures:** The GPF system is monitored by multiple sensors (temperature, pressure, etc.). Without recalibrating the ECU, these sensors could malfunction, causing poor engine performance, inconsistent power delivery, or further triggering limp modes and fault codes.
In summary, the car will likely throw error codes, and you could experience fueling, exhaust temperature, or turbo-related issues. Over time, carbon buildup could increase, and without correcting the ECU, these issues could affect overall reliability and engine health.
@AI-Records24 sweet 👍🏼
yeah it requires mapping out when gpf is removed on these, will end up running in limp mode if you dont.
@jamielearmonth1039 sweet it went for it anyway so be cool 👍🏼
Wheel barrow tips😂😂😂
😬😬😬
I’ve got a 440i with bmw Mppsk - was perfect until I decatted it! How would you suggest turning the noise down a bit ."?
I've never actually seen one with the mppsk in person but a quick Google looks like they never had a centre resonator. Maybe adding a resonator back in would help? Unsure on a 100% answer to this but if your local happy to give it a shot
I love your work and channel but please tell that ld to wear eye protection cutting that exhaust with no protection is fucking savage
@Joeyhill-wj6js we have almost run out of safety squints so we will start using proper eye protection from now on 🫡🫡
"No vehicles waa driven on uk public roads with illegal modifications" Tesla get out of way!!! 😂😂😂
@@TIM612826 bloody teslas on track days 🤓😁🤣
Big private road must be airfield with bypass
@@rickyperks3895 yep it's a runway 🤣🤝
@naw looks more like blyton park with that straight rather than donington park
@@timburrowsracing 🤣🤣🤣
Reet quiet 😂😂 Alreeet duck
@@craighorton6387 🦆🦆🦆
@@NAWFABZ 🤣