Eboost2 turbo boost controller help

[ptuomov]

Anyone with any real info how the Turbosmart Eboost2 COr functionality actually works? I don’t know exactly how it works, but looking at the actual resulting solenoid duty cycles Some years ago, it Is clear that the controller doesn’t work the way that this manual page says it works:

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18FE69F3-E02D-4C8A-845B-4E9C23AE5040.png

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It’s not a full closed loop boost controller and the boost isn’t linearly related to duty cycle so there’s zero chance that the manual is 100% accurate.

[ptuomov]

The technical documentation of this boost controller is epically bad by my tastes. It doesn’t describe the basics of the algorithm. The controller itself has been very good in practice, but I’ve had to reverse engineer the functionality and algorithm. I’d rather not be operating on guesswork with 1000 crank hp. Anyone in the know about the control algorithm used?

For example, there’s no description of how the controller performs its basic function of opening and closing the solenoid. My guess (not a fact but just a guess) is that the solenoid is 0% duty cycle when unpowered and 100% duty cycle by Eboost2 when the system is powered and measures a pressure under the gate pressure. After the gate pressure is met, the system ramps down the duty cycle to the programmed set point at a rate that depends on the undocumented “sensitivity” parameter. Do you agree with my guess, in case anyone else has been trying to reverse engineer one of these to write his own users manual?

[ptuomov]

As background, the setup in my car is as follows:

44C4D3F9-2FF4-48CE-A398-B2D9F13D2535.png

[Firechicken]

I used one of these for a short time on my car. If I recall correctly, the solenoids are normally closed and start to duty cycle when programmed boost is met. Starting at 20% and ramping up to maintain the set boost level as you have suggested. My waste gates were single port and I still had boost creep on my setup at 100% duty cycle so I removed the system and went back to a manual controller.

[ptuomov]

I used one of these for a short time on my car. If I recall correctly, the solenoids are normally closed and start to duty cycle when programmed boost is met. Starting at 20% and ramping up to maintain the set boost level as you have suggested. My waste gates were single port and I still had boost creep on my setup at 100% duty cycle so I removed the system and went back to a manual controller.

We’ve got the system working near perfectly now, I’m just complaining about the documentation as I’m trying to do something more. The Eboost2 itself was the cheapest +100hp ever.

[Firechicken]

Good to hear. I could see it working well to help with a boost drop off condition. My turbines are a bit undersized and it had trouble controlling them in my case.

[ptuomov]

Good to hear. I could see it working well to help with a boost drop off condition. My turbines are a bit undersized and it had trouble controlling them in my case.

There’s a way to set it up to deliver high boost even with high exhaust back pressure.

I’m using it to ramp up boost at high rpms to compensate for the NA VE dropping, that’s the most attractive hp/$ use with knock limited engines and large enough turbos.

[vannik]

Maybe it uses a simplistic linear scaling algorithm with fudge factors and that is why they do not want to disclose? But I agree, for such a critical piece of equipment where a wrong application can lead to a blown engine, the documentation sucks.

[Kevin Johnson]

Anyone with any real info how the Turbosmart Eboost2 COr functionality actually works? ...

WAG

https://patents.google.com/patent/US20190136750A1/en

[ptuomov]

Anyone with any real info how the Turbosmart Eboost2 COr functionality actually works? ...

WAG

https://patents.google.com/patent/US20190136750A1/en

That’s unrelated. It’s a patent related to the compressor bypass valve.

[Kevin Johnson]

Anyone with any real info how the Turbosmart Eboost2 COr functionality actually works? ...

WAG

https://patents.google.com/patent/US20190136750A1/en

That’s unrelated. It’s a patent related to the compressor bypass valve.

Yes, I know.

Read the background art.