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Old 11-24-2007, 04:37 AM   #16
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on that rear belt, does it still have teeth? you said that it was "frayed."

also, you could have a set screw that backed on the brake disk holder, check that.
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Old 11-24-2007, 04:45 AM   #17
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thanks guys, ill have to have a good look at it tomorrow when i can see what im doin, but from what you have been saying i think it might either be the diff( i have gone through a few tyres...) from what i could see before the grub screw was still screwed in, i guess that is why the wheels still turn when the car is in the air, but when i put friction on it, like on the ground its like i have the idle turned too far up one the controller(obviously i dont) the car just basically rolls when i rev it.....sound like a diff?
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Old 11-24-2007, 04:46 AM   #18
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and yes the belt still has teeth, good contact with the pulley
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Old 11-24-2007, 04:49 AM   #19
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by the sounds of it you know these things inside out.... me on the other hand i only know how to put fuel into the car and turn it.. thats it. lol oh hang on in my own defence i have changed a few tyres and a dog bone. woo-hoo
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Old 11-24-2007, 05:00 AM   #20
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pull your diff out check it,be sure you put all your parts in a container there easy to lose, now you could get a diff gear kit and fix it find out what weight silicone to put in it and put it all back together and you should be good to go. the above should not be to expensive.
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Old 11-24-2007, 05:10 AM   #21
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did you ckeck the clutch on the car too. It just rev's you said.......like at high idle......possibly a slipping clutch.....
anyway, good luck......

check this: when the car is on the ground, are the gears spinning as fast as they should be on the 2speed shaft?
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Old 11-24-2007, 05:54 AM   #22
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Maybe try screwing in the high speed needle on the carburettor, possibly the engine is too rich and not developing enough rpm to engage the clutch properly.
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Old 11-24-2007, 06:26 AM   #23
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what type of clutch are you running a 3 shoe or ufo centax? when I upgraded to a ufo clutch on my stock nitro engine I used a very stiff spring and it was doing what you said above you rev it heaps and go nowhere plenty of slipping?
as I said above look closely at your clutch and diff
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Quote:
Originally Posted by Dave_x8 View Post
by the sounds of it you know these things inside out.... me on the other hand i only know how to put fuel into the car and turn it.. thats it. lol oh hang on in my own defence i have changed a few tyres and a dog bone. woo-hoo
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Old 11-24-2007, 06:32 PM   #24
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thanks for the tips guys ill have a look at it today sometime, and as for the clutch i dunno what sort it is i bought the car as RTR and i dont know that much about r/c cars yet. thanks again..
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Old 11-25-2007, 02:31 PM   #25
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Hey guys, I think this thing has a push type clutch. If this is the case, I can almost gaurantee that it's the clutch. If it is this style clutch, then it could be a worn out clutch shoe, Too much end play, too stiff on the spring adjustment, bad thrust bearing or all the above. I would start with loosening the clutch adjustment screw (under the clutch bell, you need to take this off). I think that you clutch has maybe worn down enough that since you have less material on the shoe, it needs to travell out further to fully engage. Your endplay will change as well. But one thing at a time as these clutches are more "picky" so to speak. Lots of adjustments to make them right. Not difficult, just lots to it compared to a "swing out" type clutch. So like I said, loosen the clutch screw about half of a turn for starters and see what happens. I might be wrong on the type of clutch it has, but this would all make the most sence to me. Good luck and let us know what type of clutch you have, whether its a push type like (centax) or other type with 3 swinging clutch shoes.
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Old 11-25-2007, 11:57 PM   #26
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ok cheers ill keep you informed and thanks again for the help
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Old 11-26-2007, 02:46 AM   #27
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GPX4 RTR comes with a Centax clutch....

My guess it is the brakes binding, there is two guides moulded into the bulkhead that the pad sits in between. It isn't sitting on two screw like on other cars, the brake disc is very wide (eg... MTX3) and i believe it is rubbing.

Have fun
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Old 11-26-2007, 03:04 AM   #28
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Quote:
Originally Posted by hooked_on View Post
GPX4 RTR comes with a Centax clutch....

My guess it is the brakes binding, there is two guides moulded into the bulkhead that the pad sits in between. It isn't sitting on two screw like on other cars, the brake disc is very wide (eg... MTX3) and i believe it is rubbing.

Have fun
But he says it seems to run good with the tires off the ground. I would think he would notice the brakes draging like this as well?
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Old 12-10-2007, 04:35 AM   #29
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Quote:
Originally Posted by hooked_on View Post
GPX4 RTR comes with a Centax clutch....

My guess it is the brakes binding, there is two guides moulded into the bulkhead that the pad sits in between. It isn't sitting on two screw like on other cars, the brake disc is very wide (eg... MTX3) and i believe it is rubbing.

Have fun
I had problem with my GPX4 RTR moons ago and Centax clutch wasn't shimmed right. To compensate overtightened clutch spring......... Once adjusted/ shimmed right, no problems. I went by to book and perfect Same symptoms; rev off ground alright then nothing/ snail pace on ground.
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Old 12-29-2007, 03:53 AM   #30
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so are you saying that i dont need a new clutch then? would be nice if i didnt have to spend more money on it, so just tighten the clutch spring a bit more you say.... to do this i need to take what apart?
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