R/C Tech Forums - View Single Post - NEW HOBBYWING STOCK SUPERCHARGED SOFTWARE
Old 05-10-2011 | 12:47 AM
  #4964  
NTS
Tech Initiate
 
Joined: Dec 2010
Posts: 33
Default High speed brake problem...

Originally Posted by NTS
Hello,

I'm running the Xtreme stock in 13.5 touring. First time out on friday night and generally the ESC went very well, the car was quick enough and the temps reasonable so still has potential to go quicker. The issue I did have was a distinct lack of brakes from high speed, basically hit the brake at the end of the straight and no response. Once the car had coasted down a bit the brakes seemed to come in and were strong enough to stop reasonably quickly. This is also apparent on the bench with a delay in braking from high speed.

Tried various settings and two different motors as a club mate said he had seen the same issue with a Speed Passion ProStock / X12 combination.

30m x 15m carpet track

Software 211
LRP x12 13.5 (-10 insert)
fdr 7.25
1. Running Mode = Fwd / Brake
2. Drag Brake = 0%
3. Low Voltage = 3.0v
4. Start Mode = Level 4
5. Max Brake = 100%
6. Max Reverse = 100%
7. Initial Brake = 0%
8. Neutral Range = 6%
9. Boost Timing = 34
10. Turbo Slope = 18
11. Over-heat = On
12. Turbo Timing = 0 (yes zero)
13. Boost Start RPM = 6000
14. Turbo Delay = 0.4s
15. Timing Punch = 450 rpm/deg

Also tried with Novak SS 13.5 with the following changes:

9. Boost Timing = 44
12. Turbo Timing = 20
13. Boost Start RPM = 3000
14. Turbo Delay = 0.3s

Both motors had good speed and reasonable temps, smooth and nice to drive with the exception of the poor brakes.

Can anyone suggest what I should be doing differently?

Cheers,

Nick
Originally Posted by Benzaah
Sometimes when you think you have no brakes it is actually the brakes locking up on you and your car sliding instead of stopping. I have run all the software since 518 and have found the transition from on throttle to brakes the best on the new 211 software. I really liked the 1224 software and thought that it is slightly faster than 211 but with higher temps and not as nice brakes. i can handle a little less speed as it helps lap times along the way.
.
Benzaah,

Thank you for the thought and I know what you mean about locking wheels making the braking seem poor but that clearly isn't my current problem as the car doesn't slow at all when the brakes are first applied. If I was locking the wheels the car would react and dip as the brakes were applied but then not slow very quickly due to the slide. I can also replicate the braking hessitation from high speed on the bench where locked wheels would be obvious.

I have a few things to try suggested by others so I'll let you know how I get on.

Cheers,

Nick
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