N63 Exhaust Manifold/Header conversion

[JimiJoey]

Originally Posted by Dasky_spas

Just search YouTube for before and after heat test on YouTube. I have or had it on a bunch of parts and its a joke.

The only coatings that seem to demonstrate heat retention are White lightning and jethot. I have s63 manifolds that are already jethot coated for sale if anyone is doing this project.

You decided to stop with your project on the conversion??

[scottminor]

No way! Manifolds arrived today. Got them de-burred with the dremel. Taking them tomorrow to get ceramic coating. It’s part of a bigger project. Changing charge pipes and adding silicone intakes. I also have to get turbo housing machined. I am debating down pipes and bootmod3 tune. I already have Dinan DINANTRONICS X. Not sure if I can run bootmod and Dinan at same time. Early part of research, email in to Dinan on that one.

[Dasky_spas]

Originally Posted by JimiJoey

You decided to stop with your project on the conversion??

Yes. How to Relocate the oil cooler is a mystery and I've heard coding the dme is extremely difficult to get fuel trims correct wth the conversion. I may just get custom log style manifolds made instead.

[scottminor]

Dropped off manifolds with Miller Custom Coatings. They are awesome. We blasted a little too the raw material underneath. I am really hoping this works like I think. Getting the turbo flanges machined is not that big of a deal. What I am trying to figure out is how any why the tune would need to be altered. I have been reading as much as I can find about the difference in how the “cross fire” function is different from the “log” 1-4 and 5-8 manifolds work with the air fuel delivery. The O2 sensor before the cats would monitor if it was lean or rich and make adjustments accordingly. How does each cylinder know if it is lean or rich. Does that principle apply to all cylinders or just one. I understand the issue of left and right side, and now the idea that there is a blend of left and right monitoring by the sensors in each down pipe. Is the air fuel mixter based on the average of both O2 sensors? I don’t really know what the secret ingredients are in the tune. I have a demo copy of winOLS but I don’t have a tune to load to play with to see how it works. Based on some of the maps I have seen, there are sensors that provide feedback to allow the engine to function. Altitude, humidity, octane level, etc. These things alll play a part. The computer will only allow so much within certain sensor ranges. I have rambled here I know and I apologize. I am also learning a lot. I appreciate all the feedback and comments. I love that we have this forum to work together and learn from each other. Please share what you know and help me understand what I am getting myself into. I am really fascinated as to how the one side vs cross fire works with the ECUs.

From CoPilot.
The BMW N63 and S63 engines rely on several sensors to manage the air-fuel mixture effectively:

1. **Mass Air Flow (MAF) Sensors**: These measure the amount of air entering the engine, providing critical data for calculating the air-fuel ratio.

2. **Oxygen (O2) Sensors**: Located in the exhaust system, these sensors monitor the oxygen levels in the exhaust gases to ensure the air-fuel mixture is optimal for combustion.

3. **Manifold Absolute Pressure (MAP) Sensors**: These measure the pressure within the intake manifold, helping to determine the engine's load and adjust the air-fuel mixture accordingly.

4. **Fuel Pressure Sensors**: These monitor the fuel pressure in the system, ensuring the correct amount of fuel is delivered to the engine.

5. **Intake Air Temperature (IAT) Sensors**: These measure the temperature of the incoming air, which affects the density and, consequently, the air-fuel mixture.

These sensors work together with the engine's ECU to maintain an optimal balance of air and fuel for performance, efficiency, and emissions control. Are you troubleshooting an issue or exploring how these systems work?

[scottminor]

Is this what needs to be machined off?

[KurtsM5]

What's funny is after all the time and money you could have just bought an ///M car.

[JimiJoey]

Originally Posted by KurtsM5

What's funny is after all the time and money you could have just bought an ///M car.

F10 M5 was never built with Xdrive. So my idea was to build something faster. Built not bought 😉

[JimiJoey]

Originally Posted by scottminor

Is this what needs to be machined off?

I don’t have twin scroll turbos so it’s a bit different. Yours should be machined to look like this.

[JimiJoey]

Will try to upload a better clip later on today.

[scottminor]

What is the reason for the manifold bolt change?

I’m still trying to understand the tune issue. Does it matter if it’s the older DME or the newer Bosch MG1?

I think I understand. Cylinders 1-4 use one bank and cylinders 5-8 use the other. It would need to be re-mapped so that 1,4,6,7 use bank 1 and 2,3,5,8 use bank 2. Is that right?

[JimiJoey]

Originally Posted by scottminor

What is the reason for the manifold bolt change?

I’m still trying to understand the tune issue. Does it matter if it’s the older DME or the newer Bosch MG1?

I think I understand. Cylinders 1-4 use one bank and cylinders 5-8 use the other. It would need to be re-mapped so that 1,4,6,7 use bank 1 and 2,3,5,8 use bank 2. Is that right?

I personally think it will be even easier to tune the Bosch ecu’s than the single Siemens msd85.1 which I have.

That’s correct about the cilinders. Bank 1 will have cilinders 1,4,6,7 and the rest for bank 2. Now it will enrich the wrong cilinder/bank when it detects it running lean.

[scottminor]

It seems that it would be as simple as assigning the cylinder to the correct bank.

[JimiJoey]

https://youtube.com/shorts/ubHHrYZcE...-JUWyjzoWp5Cry