XL2 data graph help
07-05-2014 | 05:30 PM
#1
Thread Starter
Tech Regular
Joined: Jun 2012
Posts: 352
XL2 data graph help
New to the XL2 and the data logging feature. That said ive been reading up on the Ripple and how you dont want it to be to high. Plus it also shows whether your batteries are good or not. Now im doing high speed runs with it. Im trying to figure out if im harming the system or not.
1st set of graphs set up
Motor- Poseidon P1717-C22......its a 1717 size 2200kv motor
ESC- XL2
Battery- Turnigy A spec G2 65c 5000mAh 6s
EC5 connectors
HPI e Firestorm flux
Gearing is 37/30
GRP 1/8 GT tires
Savox SC1257 servo
Futaba 3PL
Speed was 117mph
2nd set of graphs setup
Motor- Poseidon P1717-C22......its a 1717 size 2200kv motor
ESC- XL2, red power wire pulled
Castle Cap installed
Protek 2600mAh 2s lipo hump pack
Castle blower for the motor
voltage regulator
Battery- Turnigy A spec G2 65c 5000mAh 6s
EC5 connectors
HPI e Firestorm flux
Gearing is 37/27
GRP 1/8 GT tires front
BSR 1/8 foam rear
Savox SC1257 servo
Futaba 3PL
Speed was 123mph
1st set of graphs set up
Motor- Poseidon P1717-C22......its a 1717 size 2200kv motor
ESC- XL2
Battery- Turnigy A spec G2 65c 5000mAh 6s
EC5 connectors
HPI e Firestorm flux
Gearing is 37/30
GRP 1/8 GT tires
Savox SC1257 servo
Futaba 3PL
Speed was 117mph
2nd set of graphs setup
Motor- Poseidon P1717-C22......its a 1717 size 2200kv motor
ESC- XL2, red power wire pulled
Castle Cap installed
Protek 2600mAh 2s lipo hump pack
Castle blower for the motor
voltage regulator
Battery- Turnigy A spec G2 65c 5000mAh 6s
EC5 connectors
HPI e Firestorm flux
Gearing is 37/27
GRP 1/8 GT tires front
BSR 1/8 foam rear
Savox SC1257 servo
Futaba 3PL
Speed was 123mph
07-24-2014 | 02:15 AM
#2
Tech Initiate
Joined: Oct 2013
Posts: 29
Here is what Patrick del Castillo says about ripple on the Mamba XL:
You have about 11% ripple, too high. I'd get a cap pack and place it as near as possible to the ESC. Shorten battery wires and make sure you use good connectors.
For your batteries, you generally want to make sure that they never drop below around 3.3V per cell under load. Your log shows 3.2V, that won't kill your lipos instantly but may stress them more. Also make sure that your lipos do not get hotter than 120F during the run.
What was the sample rate with those logs? If you want to "catch" very short current spikes on the graphs, set it to 10Hz.
It would be nice if you could post those graphs (or some new ones) again, but zoomed in so that it only shows the speedrun itself, i.e. seconds 90-115 in the graph. Please also include the throttle input in the graphs, this way people can see better what's going on.
I would be interested in how the XL2 runs with that high gearing, do you have cogging problems?
Is the gearing 37t pinion and 30t spur, or the other way around?
How much does that car weigh ready to run with Lipo?
A good place to be is at less than 5%-7% of pack voltage for the worst-case ripple voltage.
An OK place to be is 7%-10% of pack voltage for worst-case ripple.
10%-12% is marginal, and is risky.
If ripple voltage is above 12-15% (or more) of pack voltage at any point, it's likely that the battery isn't up to the task, and you run the risk of damaging the battery and the electronics.
An OK place to be is 7%-10% of pack voltage for worst-case ripple.
10%-12% is marginal, and is risky.
If ripple voltage is above 12-15% (or more) of pack voltage at any point, it's likely that the battery isn't up to the task, and you run the risk of damaging the battery and the electronics.
For your batteries, you generally want to make sure that they never drop below around 3.3V per cell under load. Your log shows 3.2V, that won't kill your lipos instantly but may stress them more. Also make sure that your lipos do not get hotter than 120F during the run.
What was the sample rate with those logs? If you want to "catch" very short current spikes on the graphs, set it to 10Hz.
It would be nice if you could post those graphs (or some new ones) again, but zoomed in so that it only shows the speedrun itself, i.e. seconds 90-115 in the graph. Please also include the throttle input in the graphs, this way people can see better what's going on.
I would be interested in how the XL2 runs with that high gearing, do you have cogging problems?
Is the gearing 37t pinion and 30t spur, or the other way around?
How much does that car weigh ready to run with Lipo?
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