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Old 01-15-2009, 07:24 PM   #16
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Can you drive the car up to your feet stop, and have the engine idle without the car moving or engine dieing. If this is the case the clutch spring isnot broken.
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Old 01-15-2009, 07:29 PM   #17
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The reason why I mention about the flywheel nut being loose is that I have seen this on two other HPI car kits and one RTR. The Flywheel will be tight but due to the high RPM's these motors turn, they tend to slip. The last time I saw this problem was this past summer on a freshly built R40.

Most of the time when dealing with RC cars the issue is so small that it pisses the best of us off. Hang in there !!
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Old 01-15-2009, 08:24 PM   #18
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Can you drive the car up to your feet stop, and have the engine idle without the car moving or engine dieing. If this is the case the clutch spring isnot broken.

yes i can take it down a long straight, corner it, turn it etc then brake and car can idle. Engine does not die.
ok its not the clutch spring then....thanks.
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Old 01-15-2009, 08:29 PM   #19
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The reason why I mention about the flywheel nut being loose is that I have seen this on two other HPI car kits and one RTR. The Flywheel will be tight but due to the high RPM's these motors turn, they tend to slip. The last time I saw this problem was this past summer on a freshly built R40.

Most of the time when dealing with RC cars the issue is so small that it pisses the best of us off. Hang in there !!
Ok Well I took the car to my local nitro specialist, he advises its the transmission,and engine is fine. Even though, I can't see why it would be transmission as I don't know EXACTLY how they work, but I have opened the thing before, and its basically a circle steel bit, with 2 holes, one to hold it on the transmission in place with a grub screw once placed in the transmission cover plate, and another for gear shifting, which has the ball, spring, and grub screw. I have replace the ball, spring and grub screw which did not fix the problem, so maybe it might the whole transmission.
I hopefully have recieved my parts in the mail today, so I will change the transmission. If thats not the problem, then I will have to check the flywheel nut. thanks for your help. I have been doing my own research and some ppl with similar issue to advises to check the flywheel nut too.
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Old 01-18-2009, 04:05 PM   #20
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Default HELP...RPMs very low [SOLVED]

hey guys, I can officially say the problem was with the 2 SPEED TRANSMISSION !
My car is working great and hitting 2nd gear with definition I had a great time on the weekend racing with my friends...I still want to know how my transmission ended up not working anymore...instead of just replacing it.
Thanks for everyones help, appreciate the replies and input.
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Old 01-20-2009, 09:02 AM   #21
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hey guys, I can officially say the problem was with the 2 SPEED TRANSMISSION !
My car is working great and hitting 2nd gear with definition I had a great time on the weekend racing with my friends...I still want to know how my transmission ended up not working anymore...instead of just replacing it.
Thanks for everyones help, appreciate the replies and input.

Good to hear. I bought a back up 2 speed for my 3 +. I havent had an issue with mine yes other than the engine bolts coming out and striping my tranny gears. Car is a ton of fun though.

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Old 01-20-2009, 06:34 PM   #22
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Originally Posted by beers4evo View Post
hey guys, I can officially say the problem was with the 2 SPEED TRANSMISSION !
My car is working great and hitting 2nd gear with definition I had a great time on the weekend racing with my friends...I still want to know how my transmission ended up not working anymore...instead of just replacing it.
Thanks for everyones help, appreciate the replies and input.
Your two speed works on centrifugal forces. When your 2 speed spins around it takes a certain amount of rpm's for your 2 speed to kick in. This is how we tune them by either tightening them=later engagement or by loosening them=earlier engagement, it all depends on track and driving style that determines when it should engage. There is usually two types of 2 speeds used the shoe type or the finger type. The shoe type is typically two carbon shoes that are held together by two timming screws and springs. The tension on these springs is what determines your shift point. When the rpm's are to much for the spring tension the shoes will open outwards thus engaging your 2 speed hub. The finger type is usually like a drum with a "finger" mounted inside it in one spot. There is only one timming screw on these types. Same as before, when the rpm's become to much for the tension applied to the timming screw/spring the single finger will open outwards to engage the 2 speed hub. Both will work but the "shoe type" are better, more consistent and are less prone to slipping than the finger type.

I hope this has shed some light on how a 2 speed works, i'm not sure which one comes with your car but it doesn't matter they all work off the same principle, centrifugal forces
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Old 01-20-2009, 07:11 PM   #23
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Originally Posted by freestyles View Post
Your two speed works on centrifugal forces. When your 2 speed spins around it takes a certain amount of rpm's for your 2 speed to kick in. This is how we tune them by either tightening them=later engagement or by loosening them=earlier engagement, it all depends on track and driving style that determines when it should engage. There is usually two types of 2 speeds used the shoe type or the finger type. The shoe type is typically two carbon shoes that are held together by two timming screws and springs. The tension on these springs is what determines your shift point. When the rpm's are to much for the spring tension the shoes will open outwards thus engaging your 2 speed hub. The finger type is usually like a drum with a "finger" mounted inside it in one spot. There is only one timming screw on these types. Same as before, when the rpm's become to much for the tension applied to the timming screw/spring the single finger will open outwards to engage the 2 speed hub. Both will work but the "shoe type" are better, more consistent and are less prone to slipping than the finger type.

I hope this has shed some light on how a 2 speed works, i'm not sure which one comes with your car but it doesn't matter they all work off the same principle, centrifugal forces
Good info. for beginner...
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Old 01-20-2009, 08:07 PM   #24
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Default clutch

i didnt read so i may be repeating something but...

its your clutch shoe and spring. the pop u heard was the spring breaking and hitting the inside of the fly-wheel. takes 5 mins to replace and its under $10 to get new clutch shoes and springs. Hopes this helps!

if its not that check the slipper clutch. tighten it and see if the pads are worn that would cause it not to turn the tranny under a load (such as driving) but would not affect idle or free revving without a load. tighten it about 3/4 to 1 turn clock-wise.
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