Re: BMW N55 electronic wastegate
 

I have posi taps Richard that's a good idea. I'll get the voltage by the end of today

Re: BMW N55 electronic wastegate
 

Engine running connector plugged in:

1. Motor (+) - 0vdc
2. Power supply(+) - 4.98vdc
3. Power supply ground
4. Wastegate rod position - 1.2vdc
5. Motor (-) - 0vdc

Re: BMW N55 electronic wastegate
 

Thanks for the quick update. This is good, all makes sense. It appears the rod is at 1.2V at idle.


I think the next steps are leaving the sensor unplugged, go for a drive...

1. Slowly squeezing the throttle, if there are no boost, you can continue to squeeze the throttle slowly until wot.

2. Again squeezing the throttle slowly, if it starts to build boost. abandon the test.

This test is to confirm at what rod position in relation to boost or no boost. Once we have established this, we can then manipulate the pin #4 signal and control boost.

Do you think this is a good plan?

Re: BMW N55 electronic wastegate
 

Yup I'll report back with results

Re: BMW N55 electronic wastegate
 

We are getting quite close to take control of this.

Re: BMW N55 electronic wastegate
 

Awesome!

Ok there is no boost. I make like 3 to 4 pounds at wot.

Re: BMW N55 electronic wastegate
 

This very good news.

Just to recap ....
1. The rod is at "low" boost position at idle after start up.
2. After unplugging, the position of the rod is not changed.
3. Upon driving under load, the boost remained low.


.

Re: BMW N55 electronic wastegate
 

Yup seems to be the case....

Re: BMW N55 electronic wastegate
 

I can think of two ways to controlling the rod length.

1. Positive biasing the rod position voltage at pin #4. to the control loop should extend the rod and lower boost.
2. Positive biasing the T-MAP sensor.
3. Combination of the above.

I will set out a method to make this happen. I notice BMS sell a male/female plug for this wastegate sensor. If you can purchase one of those, I will pay you back. This will make life a lot easier.

http://www.burgertuning.com/N55_JB4_upgrades.html

Re: BMW N55 electronic wastegate
 

Ok cool I have that harness already. I was actually going to mention it but I forgot. This harness only loops the wastegate rod position through the jb4....

Quick question, can this be done with a hfs-4 v2 controller? That's the controller I have...