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Ask Steve "The Evicerator" Weiss

Ask Steve "The Evicerator" Weiss

Old 11-15-2004, 10:47 AM
  #631  
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Dear Steve,

Thanks for answering my silly question. I meant it to be silly, but I guess a lot of other people would like to see other colors too? I'm sure Novak will never switch from orange! Take care and I'll see you at the track!

Pat
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Old 11-15-2004, 10:48 AM
  #632  
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There are no silly questions...just silly...faces !
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Old 11-15-2004, 11:22 AM
  #633  
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I remember a top national oval racer showing up to Lake Whippoorwill with all his Novak cases dyed black. Bob went ballistic and made him change all his stuff back to stock orange cases. I don't blame him at all. Orange stands out so well in pics its a great marketing idea.
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Old 11-15-2004, 11:53 AM
  #634  
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so true so easy to notice against any colour
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Old 11-15-2004, 02:56 PM
  #635  
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is it illegal to operate an RC car under the influence of alcohol. It just popped into my head. Is there any laws like that??
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Old 11-15-2004, 07:28 PM
  #636  
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Originally posted by Evicerator
There are no silly questions...just silly...faces !
Steve,

How many amps do I charge my SPY Lithium-Ion micro Battery Pack?

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Old 11-15-2004, 08:21 PM
  #637  
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Thad,

Does HPI know how much time you must spend looking for silly pictures online all day long?

Btw, there is a recall on all Li-Ion Spy packs... you should call charlie in Customer Service and have him ...service you so that you don't hurt yourself!
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Old 11-15-2004, 11:17 PM
  #638  
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I think this is the first serious question I've asked in this thread, so here goes:

With all these speedos out there now that you can change the frequencies on, if you set the frequency too low can it actually cost you top speed? I know by altering the drive frequency lower it can improve punch and acceleration, but is there a point of diminishing return where it costs you top speed?
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Old 11-16-2004, 09:04 AM
  #639  
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Gary-

In theory, your drive frequency shouldn't effect top speed at all because at full throttle there is no actual turning on and off of the fets... frequency shouldn't matter at that point...the fets are just on and the ESC is allowing everything that your battery has in it to go to the motor.

That being said, I might be lead to believe that you can run a drive freq that is so low that you can put a tremendous load on your batteries and they are unable to "recover" and produce power "down the straight"...

But that's just conjecture on my part... I'll sit down and have a talk with Adnan about it and see what he has to say.
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Old 11-16-2004, 09:29 AM
  #640  
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Drive frequency only effects how much punch you have at partial throttle. The lower you go the more punch you get until you over heat your motor and fry your comm.

The reason what this works has to do with hysterisis...or how long it takes for the iron in each pole to charge and become an electromagnet. At lower rpm and high drive freq's each pole is getting switched off and on while its trying to reach saturation (the fully charged state). This condition makes a motor feel like it has less punch.

With a lower drive frequency the rpm at which a pole will get switched on and off is lower and you feel more punch. However, if the drive freq is low enough that the pole can fully staturate...thats it... the motor can't spool up any faster than that. If you really lay on the throttle with a low drive freq you motor will get hot, you'll cook the brushes and fry the comm. This is the late race motor fade than some racers experience.

So how low a drive freq can you run? That depends on how good you are at throttle control. If you really snap the throttle open you will have to run a higher drive freq. If you are really smooth and roll on the throttle you can run a much lower drive freq. In stock I have to run ~2500hz to keep my motors alive. Alex Lopez can run 1500hz and his motors look better than mine. In Mod I have to run 4500hz but Paul Wynn can run 1500hz with no problems at all.
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Old 11-16-2004, 09:37 AM
  #641  
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Thank you for your detailed explanation Adrian... I guess importing Keyence stuff has taught you a thing or two

And FYI our GTX's default drive freq is 3.5 kHz... sometimes stock/19T guys like to run lower ... 2.5 kHz and lower

It all basically boils down to your preference and your throttle finger like Adrian mentioned
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Old 11-16-2004, 10:23 AM
  #642  
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Originally posted by Evicerator
Thank you for your detailed explanation Adrian... I guess importing Keyence stuff has taught you a thing or two

And FYI our GTX's default drive freq is 3.5 kHz... sometimes stock/19T guys like to run lower ... 2.5 kHz and lower

It all basically boils down to your preference and your throttle finger like Adrian mentioned
Steve, what is the preset frequency for the GT7? Thanks, Jeff
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Old 11-16-2004, 10:44 AM
  #643  
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in all the newer GT7's that default to profile 5, the drive freq is 3.5 kHz... in the older versions that defaulted to profile 1 the drive freq is 15 kHz.
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Old 11-16-2004, 01:07 PM
  #644  
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I intentionally did not bring up the "K" word as this is your house and I didn't want to disrespect it

I have learned a lot about speedos...unfortunatly...i'm not any faster because of it...lol! All my gear is limited by the loose nut behind the wheel.
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Old 11-16-2004, 01:10 PM
  #645  
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It's all good... I do appreciate your thoughtfulness "when in my house"

I wish all people acted in such a manner... I certainly don't go into tekin, lrp, ko, keyence, mrt, or XXXX threads and start gabbing about how great novak stuff is compred to brand X.

Which reminds me...whatever happened to that meeks fellow?
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