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Old 07-17-2009, 07:35 AM   #1
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Default Car needs a nudge to get going...

Hi All,

I have a Tamiya TA05 chassis, with a Losi Excelorin sensored esc and 3.5T brushless motor.

The problem is that the car wont take off without a nudge, even holding it in the air, most of the time I need to rotate the driveline a little to get the motor to spin under its own power.

My question is, has anyone experienced the same thing?

Heres the history..

A couple of months back, I cooked a sensored Excellorin ESC, it was replaced under warranty, and the new one seems to be having the issues above.

Assuming it was anything but the ESC (because it was a brand new warranty replacment), I first of all blamed the drive line being bent. So I stripped the car and checked re-greased everything and assembeled, it all rotated well.

Problem still exists, so I replaced the motor and sensor wire with a brand new identical 3.5T Losi excelorin. Still the same problem.

Tried a new battery (original was an 11.1v lipo) this time a 7.4v lipo. Still got a problem.

Tried a new steering servo, nope, try again.

Different receiver (Spektrum DX3S and Spektrum telemetry receiver), nup.

Then decided, the chassis must be doing some strange things. It has had a pretty hard life and I wanted to switch to belt drive, so I transfered everything into a brand new Tamiya TA05 (built today).

Tomorrow morning im going to wire up another new Losi ESC and see if the problem is still there. If its fixed, then take it back to the shop for another 4 week wait for warranty. Lucky I bought it from a local shop rather than online, a mate of mine waited 10 months for Horizon to replace the Losi esc he bought on ebay.

I have a couple of Losi Excelorin ESC's in other cars (AE B44 and Kyosho ZX5), and they have worked without fault and taken a beating, I have setup the ESC with both USB interface and program card. What im trying to say, I have had a fair bit of experience with the ESC, and I know the programming well, so its not a programming issue.

So yeah, sorry for the novel! But I was curious to know if anyone has experienced anything similar, or perhaps someone can expand on what could be causing this?

Is the ESC unable to deliver the required power to start to rotor? Is the sensor system screwed?
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Old 07-17-2009, 07:47 AM   #2
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probably the sensor wire or most likely the motor is cooked

i have done 2 , sensor pack in the back of the motor goes
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Old 07-17-2009, 07:49 AM   #3
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Like above, normally that's either the sensor wire or the sensor unit inside the motor itself

Try a different sensor cable, and if that doesn't work try a different motor, borrow one if you don't have 2

Rarely I have seen where the sensor unit inside the ESC is toast as well, but try the first 2 things to determine that
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Old 07-17-2009, 07:54 AM   #4
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Your gear mesh isn't extremely tight is it?
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Old 07-17-2009, 07:59 AM   #5
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Already replaced the motor and sensor wire once with brand new ones.

The drive line is smooth, the spur and pinion gears have a fraction of free movement. I set all my cars the same way.

I will try another known good motor, I dont have any more new ones!
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Old 07-17-2009, 08:19 AM   #6
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Quote:
Originally Posted by rexxxy View Post
Hi All,

The problem is that the car wont take off without a nudge.

My question is, has anyone experienced the same thing?
I had the same problem. it was the BL ESC But a different brand

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Old 07-18-2009, 10:30 AM   #7
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Thanks for the suggestions guys, it was the ESC. I replaced it with another, and it works fine.

So now I have to return the faulty one back to my local shop. So thats 2 Xcelorin ESC's out of 4 that have died.
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Old 07-18-2009, 11:19 AM   #8
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Quote:
Originally Posted by rexxxy View Post
Thanks for the suggestions guys, it was the ESC. I replaced it with another, and it works fine.

So now I have to return the faulty one back to my local shop. So thats 2 Xcelorin ESC's out of 4 that have died.
was the last one repaired or a new one ??

maybe not repaired well

glad you got it sorted out
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Old 07-18-2009, 11:43 AM   #9
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sometimes the rotor just needs to be re shimmed a little closer to the sensor.
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