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Old 10-15-2009, 02:56 PM   #1
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I recently build my Tamiya Porsche 911 GT3 in Aug 2009 (TT01-E chasis)(2007). When I hold it up in the air and accelerate it works fine BUT when I put it back on the floor and accelerate, it moves really slowly??? Is it the ESC??? I've taken the whole car apart and rebuilt it but have FAILED TO SUSS THE PROBLEM...... Can somebody PLEASE HELP AND SOLVE THIS PROBLEM

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Old 10-15-2009, 03:59 PM   #2
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Brushed or BL Lipo,Nimh,Nicd?? could be a few things off the top of my head. Gearing too low. weak battery. its gonna run in the air because you don't have a load on anything start there
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Old 10-15-2009, 08:45 PM   #3
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Could also possibly be a really loose diff(s) (assuming it's a ball diff on that model).
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Old 10-15-2009, 08:50 PM   #4
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tt01 is a gear diff.
Are you using the tamiya esc? how about the stock gearing?

the tamiya esc is a pita, try recalibrating

Stock gearing with the stock silvercan motor is painfully slow
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Old 10-16-2009, 03:27 AM   #5
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I'm using the Tamiya Esc (is it crap???) and I've tried after recharging the batteries but still no difference, which battery is best?? (It's my first build so I don't know much... ) I'm using all standard parts which were supplied with the car apart from the metal ball bearings. motor is standard as well....

I'll try to recalibrate the esc and try again in the summer as I've left my car in Hong Kong during my holiday.

Has anybody experienced this problem before??

Every1's suggestions are HIGHLY APPRECIATED

Many THANKS in ADVANCE
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Old 10-16-2009, 12:09 PM   #6
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Motor could be dirty as well. An overly dirty comm or brushes could do exactly this. Wouldn't hurt to clean both contact points.
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Old 10-16-2009, 12:36 PM   #7
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yes, recalibrate ESC and try a different battery
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Old 10-16-2009, 03:28 PM   #8
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can anyone suggest a good battery for this car (1:10 Tamiya Porsche 911 GT3 2007 VIP CUP)

Thanks
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Old 10-16-2009, 03:56 PM   #9
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My bet would be that you've ran the car a lot. You've probably wore out the brushes on the motor.
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Old 10-16-2009, 04:10 PM   #10
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I would try a lipo if possible.
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Old 10-16-2009, 04:53 PM   #11
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Quote:
Originally Posted by kami View Post
can anyone suggest a good battery for this car (1:10 Tamiya Porsche 911 GT3 2007 VIP CUP)

Thanks
Just a FYI, the stock Tamiya ESC is just fine with the Silver Can motor. We run a TT-01 race series at our club and I have your exact same car. I still only run a 6-cell stick pack Nicd battery with a capacity of 2500MaH.

Take the motor out and make sure everything is turning alright first without any binding. Are you using the stock Tamiya connectors? Or did you make your own battery connections. Check any solder connection that you have done. Re-Cal your ESC.

Are you using a Wall Charger or a better peak charger?

I doubt the motor is bad already if you just built it in August. I have run a motor for 6 months one time, just blow it out and lube the bushings all the time.

Spin one of the front and rear tires and make sure the other tire spins the other way.

Did the car ever work properly?
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Old 10-17-2009, 02:35 AM   #12
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Originally Posted by JonesyCGY View Post
Just a FYI, the stock Tamiya ESC is just fine with the Silver Can motor. We run a TT-01 race series at our club and I have your exact same car. I still only run a 6-cell stick pack Nicd battery with a capacity of 2500MaH.

Take the motor out and make sure everything is turning alright first without any binding. Are you using the stock Tamiya connectors? Or did you make your own battery connections. Check any solder connection that you have done. Re-Cal your ESC.

Are you using a Wall Charger or a better peak charger?

I doubt the motor is bad already if you just built it in August. I have run a motor for 6 months one time, just blow it out and lube the bushings all the time.

Spin one of the front and rear tires and make sure the other tire spins the other way.

Did the car ever work properly?

It ran perfectly well on that day for 5 minutes and it suddenly stopped working. (1st Attempt)


I'm using all standard tamiya parts as supplied, I'm using the safe charger, tires spins alright...

I'll try to ReCal my ESC and if I need to change the motor which 1 should I go for?

Have you guys had this WEIRD problem before?? The car runs fine in the air but so slow on the ground??

Appreciate every1s suggestions
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Old 10-19-2009, 12:43 PM   #13
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The only time that has done that for me was when the battery was just about dead. I forgot to re-charge the battery between heats. We run a spec-class where everyone must use the Sport Tuned (black Can) motor and Tamiya ESC. The tires would spin in the air fine but as soon as the car is put down its painfully slow.

Got any other batteries you can try? Take it back to the LHS that you bought it at if you can or look for local support.
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Old 10-19-2009, 01:14 PM   #14
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I am guessing you bought the XB Porsche 911 GT3 Cup Team KTR, Tamiya model number 57784 that included the Tamiya TEU-101BK Electronic Speed Controller. Assuming I have it right, those speed controls are notorious for failure right out of the box. I would highly recommend you try another speed control and not another of the same Tamiya type.
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Old 10-20-2009, 06:35 AM   #15
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Thanks guys for your suggestions, can't wait to solve the problem

Will let you know if I do solve this WEIRD problem

Thanks again for every1s help
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