Originally Posted by piorc (Post 14548813)

Hey guys, someone could help me ?

I just got my Flow and plugged Trinity D4 13.5 ss on it.

Can anyone help me with setup ?

i cant beat the LRP motors.

Which gearing ?

Large asphalt track

Boosted setup

Originally Posted by torg (Post 14545077)

ok, so I got a new logic analyzer today and what better thing to test than the brake modes on 4.7 and 5.4?

For those that said the brakes are better in 4.7, you may be correct if you left them at default (or if you forgot to reset to factory defaults after updating). If you had them both at BD3, I don't believe you.

Here is a quick summary of 4.7 and 5.4 brake settings:

4.7 X-Brake (setting 0):
Features powerful high speed braking towards smoother low RPM braking with very neutral braking effect. Suggested for all classes and conditions.

4.7 Semi X-Brake (setting 1):
Features increasing braking force towards lower speeds. Suggested for wet or lower grip conditions.

4.7 BD3 (setting 2 - default ):
Features most direct feel and strong braking power throughout whole braking band. Suggested for all applications and conditions, especially on high grip and high speed tracks.

5.4 Semi X (setting 0):
Features increasing braking force towards lower speeds. Suggested for wet or lower grip conditions.

5.4 X-Stock (dedicated Stock brake) (setting 1) (default):
Features powerful high speed braking towards smoother low RPM braking with very neutral braking feel. This newly developed default setting will keep the motor temperature as low as possible.

5.4 BD3 (setting 2):
Features most direct feel and strong braking power throughout whole braking band. Note: Please monitor the motor temperatures when using this brake, as this brake puts more load and increases temperatures of the motor.

BD3 vs X-Stock

When HIN is low and LIN is high, battery negative is connected.
When HIN is high and LIN is low, battery positive is connected.
When HIN is low and LIN is low, battery is not connected/floating.

For BD3, they are identical. Both are ~2khz brake frequency (and ~8khz drive btw). Very straight forward and most importantly it is never affected by endbell timing. All the non-BD3 modes fire off the half bridge drivers based on what it sees on the hall sensor. It looks like sometimes two of the three poles are generating a field. Maybe trying to fire in reverse pattern? I didn't compare to the ROAR commutation sequence diagram. I suspect this type of brake can do very odd things if you have your timing all the way up at 50-60 degrees like some motors let you. If you use an LRP motor with timing inserts, it's probably safe(r).

LRP states that x-stock brake keeps the motor temp as low as possible, but it also switches more frequently causing more ESC heat and reducing ESC efficiency (but the motor is more important to keep cool).

Hopefully this provided you with some information so you can choose the braking mode that best suits your track,motor,timing,surface,style...


I also went digging inside (and outside) the updater...

http://i.imgur.com/iV5r5W2.png

Originally Posted by torg (Post 14545077)

ok, so I got a new logic analyzer today and what better thing to test than the brake modes on 4.7 and 5.4?

For those that said the brakes are better in 4.7, you may be correct if you left them at default (or if you forgot to reset to factory defaults after updating). If you had them both at BD3, I don't believe you.

Here is a quick summary of 4.7 and 5.4 brake settings:

4.7 X-Brake (setting 0):
Features powerful high speed braking towards smoother low RPM braking with very neutral braking effect. Suggested for all classes and conditions.

4.7 Semi X-Brake (setting 1):
Features increasing braking force towards lower speeds. Suggested for wet or lower grip conditions.

4.7 BD3 (setting 2 - default ):
Features most direct feel and strong braking power throughout whole braking band. Suggested for all applications and conditions, especially on high grip and high speed tracks.

5.4 Semi X (setting 0):
Features increasing braking force towards lower speeds. Suggested for wet or lower grip conditions.

5.4 X-Stock (dedicated Stock brake) (setting 1) (default):
Features powerful high speed braking towards smoother low RPM braking with very neutral braking feel. This newly developed default setting will keep the motor temperature as low as possible.

5.4 BD3 (setting 2):
Features most direct feel and strong braking power throughout whole braking band. Note: Please monitor the motor temperatures when using this brake, as this brake puts more load and increases temperatures of the motor.

BD3 vs X-Stock

When HIN is low and LIN is high, battery negative is connected.
When HIN is high and LIN is low, battery positive is connected.
When HIN is low and LIN is low, battery is not connected/floating.

For BD3, they are identical. Both are ~2khz brake frequency (and ~8khz drive btw). Very straight forward and most importantly it is never affected by endbell timing. All the non-BD3 modes fire off the half bridge drivers based on what it sees on the hall sensor. It looks like sometimes two of the three poles are generating a field. Maybe trying to fire in reverse pattern? I didn't compare to the ROAR commutation sequence diagram. I suspect this type of brake can do very odd things if you have your timing all the way up at 50-60 degrees like some motors let you. If you use an LRP motor with timing inserts, it's probably safe(r).

LRP states that x-stock brake keeps the motor temp as low as possible, but it also switches more frequently causing more ESC heat and reducing ESC efficiency (but the motor is more important to keep cool).

Hopefully this provided you with some information so you can choose the braking mode that best suits your track,motor,timing,surface,style...


I also went digging inside (and outside) the updater...

http://i.imgur.com/iV5r5W2.png

Originally Posted by Bar (Post 14560844)

Just missed the V5.0 software which is very popular with the 13.5 boosted guys here in the UK, unfortunately LRP removed it from their site for some reason

Originally Posted by torg (Post 14559449)

added some motor pole graphs.

http://imgur.com/a/DFhrO

Interesting that in x-stock they set both HIN&LIN to hi (I plot this as value of 2), I was trying to understand from the half bridge driver datasheet what that meant. I have never seen that before, to me it seems like a (timing) bug. But then again I'm just a hobbyist and not an electrical engineer.

The BD3 mode is less noisy because at full brake it is no longer modulating. All poles are wide open on battery negative, fully shorting all three phases.

Originally Posted by torg (Post 14562960)

So does this mean stock-x is regenerative braking?

Originally Posted by EDWARD2003 (Post 14560967)

:ha::ha::ha::ha::ha::ha:. I just posted the firmware download link a couple days ago. :sneaky:

Go up 4 posts...

Originally Posted by Phillip F (Post 14563682)

stupid question. LRP Flow Works ESC

IN blinky mode ...

how do I add Auto Brake or Drag Brake?
And then adjust Feel/ Initiial Drive?