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Old 01-12-2005, 08:16 AM   #76
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Terry_S -

I am the test you wanted - i.e. Novak Dually. I run two of them in my oval cars.

The stock setting is 1kHz and the modified setting is 7.8kHz. I notice a slight improvement in punch with the stock setting with stock motors

When I run 19 turn motors I actually get better performance from the modified setting because of reduced comm wear. I get 10-12 runs on the modified setting and don't fry the brushes, but only get 3-4 runs on the stock setting and the brushes are discolored after 4-5 runs.
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Old 01-12-2005, 08:44 AM   #77
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WOW, i dont have any input, but what in interesting thread, i was reading it this morning at work, i havent done anything for 2 hours cause i been reading this thing on and off.
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Old 01-12-2005, 09:31 AM   #78
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Cole Trickle I will hopefully have an answer for you when I get back, I'm off out from the office (here in the UK) I think we will get the answers later!

Slots thanks for your input, it was Cole who was asking and you have helped and that's great.

primusblowsgoat good to know it's interesting for you, I found it interesting as well, the thread reappeared after being 'dead' since 2003! It's the sort of thing people want to know about and with the help of others with varying freq ESC's (inc Keyence/KO etc) maybe we can learn more interesting stuff. I find ESC designs fascinating because there is so much high tech in them!
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Old 01-12-2005, 09:52 AM   #79
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This past summer we did alot of testing with drive freq. We took Identical cars/setups/batteries/tires/motors...everything was the same except for the Speeder. One had a Keyance the other had a Quantum. The motor in question was a 10-1 flat wire in a 4mag can. now with the keyance there was no way to make a 5 minute run without burning the brushes (purple) and turning the com red. With the LRP we were able to run 5+ runs and the brushes never discolored (they just wore too small) and the comm showed normal wear (needed to be skimmed). We went and changed the freq to match the LRP's (which I forget now) and the problem was gone. The overall power of the motor was the same but there was slightly less punch. honestly not very noticeable. The conclusion was if you are burning brushes and killing the com raise your freq up. do this in incriments until you have found your spot. now this will change from track to track. Its better to sacrifice a little punch for keeping your motors around.

Bob
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Old 01-12-2005, 09:59 AM   #80
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Quote:
Originally posted by Cole Trickle
I'm wondering about LRP IPC SR and v7.1; Both are operating at 3140 Hz, but the SR is supposed to have more punch (for stock) than the 7.1. Can someone explain how this happens?
LRP IPC SR is marketed for stock motor or over 11T modified because the FET rating is lower grade than V7.1. i.e. there is limitation for ESC pulling high amp motor.

I think it's wrong assumption if you think the SR is supposed to have more punch than V7.1. Both ESC have same driving freq. 3140 Hz but different FET rating.
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Old 01-12-2005, 01:23 PM   #81
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Quote:
Originally posted by Terry_S
.........
I find ESC designs fascinating because there is so much high tech in them!
Exactly!

Hi Terry
How are you? Any news from the MX?
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Old 01-13-2005, 01:28 AM   #82
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Quote:
Originally posted by asw7576
LRP IPC SR is marketed for stock motor or over 11T modified because the FET rating is lower grade than V7.1. i.e. there is limitation for ESC pulling high amp motor.

I think it's wrong assumption if you think the SR is supposed to have more punch than V7.1. Both ESC have same driving freq. 3140 Hz but different FET rating.
I'm not assuming, it's LRP, that calls the SR a "punch machine".

I've copy-pasted a little from the LRP site:

IPC SR DIGITAL

THE PUNCH MACHINE!!

Specially developed for all racing classes with stock-motors, such as the LRP-HPI Challenge.

Automatic brake with power brake can be activated and adjusted.

For outstanding acceleration with motors of 17 to 23 turns.

SR software for rocket-like acceleration.

Digital automatic start system.
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Old 01-13-2005, 02:25 AM   #83
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According to the LRP pricelist the IPC SR and IPC V7.1 have the exactly same hardware specs. Just the software is different. Only thing which I donīt know is drive frequency. For the 7.1 itīs 3140 Hz and for the SR they donīt say but I think itīs much lower as this ESC is designed just for stock.
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Old 01-13-2005, 02:59 AM   #84
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Quote:
Originally posted by V12
According to the LRP pricelist the IPC SR and IPC V7.1 have the exactly same hardware specs. Just the software is different. Only thing which I donīt know is drive frequency. For the 7.1 itīs 3140 Hz and for the SR they donīt say but I think itīs much lower as this ESC is designed just for stock.
I've downloaded the SR manual, and according to this, the SR drive frequency is 3140 ???
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Old 01-13-2005, 03:10 AM   #85
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Do you have both ESCīs the 7.1 and the SR? If so itīs very easy finding out if there is a frequency difference between them. Just use a small loudspeaker instead of the motor. You want know what frequency this is but you can easily hear a difference.
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Old 01-13-2005, 03:18 AM   #86
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Quote:
Originally posted by V12
According to the LRP pricelist the IPC SR and IPC V7.1 have the exactly same hardware specs. Just the software is different. Only thing which I donīt know is drive frequency. For the 7.1 itīs 3140 Hz and for the SR they donīt say but I think itīs much lower as this ESC is designed just for stock.
v7.1 has lower ON resistance than the SR, at least that's what the specs say. I sold my SR in favor of the v7.1


Both has the same operation and I decided based on what the spec sheet says. Even though I can't feel the difference between the SR's 0.00084ohm and the v7.1's 0.00052ohm ON resistance



you can find the manuals at


http://www.balakracing.com/forms.htm
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Old 01-13-2005, 04:27 AM   #87
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Hardware:
V7.1 FET can supply 690A ( 1 sec ) or 100A ( cont. ) @ .00052 ohm resistance.
SR FET can supply 610A ( 1 sec ) or 90A ( cont. ) @ .00084 ohm resistance.
BEC is 1.2A vs 1.1A @ 6v

Software:
V7.1 have reactive throttle control aka. v7.1 software
SR none, but its software is optimized for stock motor.

3140Hz is magic number from LRP's R&D in the past.
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Old 01-13-2005, 12:56 PM   #88
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Quote:
Originally posted by V12
Hi Terry
How are you? Any news from the MX?
I'm fine thanks V12 hope you are too. I found this interesting thread so I'm just taking a break from MX development. Clive is out in Italy for a few days so not too much happening here.

asw7576, you're right about the SR. I'd say it's better to have the option to set the frequency/throttle response by advanced (but simple to set) software/programming and have a better FET rating then you can choose how to run your speedo. Like Bob Barry says it's better to find the right settings for a track by seeing what drive frequency etc works best. Around 3KHz seems to be about the best all-round optimum frequency.
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Old 01-14-2005, 03:12 AM   #89
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Quote:
Originally posted by asw7576
V7.1 have reactive throttle control aka. v7.1 software
Can you explain how this reactive thing actually works?
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Old 01-14-2005, 02:20 PM   #90
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Quote:
Originally posted by Cole Trickle
Can you explain how this reactive thing actually works?
It is similar like fuzzy logic electronic transmission that assist the driver to enter the corner faster, exit faster and overtake other cars in straight. J/K

seriously..... I don't know. I just copied it from V7.1 manual. I think it's marketing craps.
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