RE: T-maxx wants to go only in reverse  
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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Monster Trucks >> Traxxas Monster Truck forum >> RE: T-maxx wants to go only in reverse
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RE: T-maxx wants to go only in reverse - 7/18/2008 10:34:34 PM   
t-maxxmaniac


 

Posts: 267
Joined: 6/10/2008
From: poland, ME, USA
Status: online 		ditch the deul pipes , is my opinion u dont get much back pressure

(in reply to bud_senior150)
       Post #: 26

RE: T-maxx wants to go only in reverse - 7/19/2008 2:04:16 AM   
matts6887



Posts: 1582
Joined: 3/27/2008
From: scottsdale, AZ, USA
Status: offline
quote:

ORIGINAL: t-maxxmaniac

ditch the deul pipes , is my opinion u dont get much back pressure


I agree!!....and to add to it, they have been known to cause nothing but a tuning NIGHTMARE to say the least....

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       Post #: 27

RE: T-maxx wants to go only in reverse - 7/19/2008 2:30:38 AM   
bud_senior150


 

Posts: 55
Joined: 7/15/2008
From: Cheektowaga, NY, USA
Status: offline 		ok then thanks, do i have to take the engne out to do it. And u think i will be better off with the single, is that why im having problems?

(in reply to matts6887)
       Post #: 28

RE: T-maxx wants to go only in reverse - 7/19/2008 2:32:47 AM   
bud_senior150


 

Posts: 55
Joined: 7/15/2008
From: Cheektowaga, NY, USA
Status: offline 		hey guy check out my vid this is my main problem, but i think i will take off the duals, maybe thats the problem
http://www.youtube.com/watch?v=xcb2-aOF2uE

< Message edited by bud_senior150 -- 7/19/2008 2:33:10 AM >

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       Post #: 29

RE: T-maxx wants to go only in reverse - 7/19/2008 2:36:58 AM   
t-maxxmaniac


 

Posts: 267
Joined: 6/10/2008
From: poland, ME, USA
Status: online 		you dont have to take the engine out but i would just to clean it, problems come when you accidently shift from forward to reverse wile moveing it will stripp gears an its a nightmare...as for the deul exost you need some back pressure to preesureize the feul tank wich helps get feul to the carb....if you got it running you have enough but its a nightmare tuneing them sometimes, i just plane dont like them ur choice but id ditch it an sell it

(in reply to bud_senior150)
       Post #: 30

RE: T-maxx wants to go only in reverse - 7/19/2008 2:38:49 AM   
t-maxxmaniac


 

Posts: 267
Joined: 6/10/2008
From: poland, ME, USA
Status: online 		When you take apart tranny nothing is gona jump out at ya (we have all had this happen) but ur all set as long as ur delicate should be easy, good luck

(in reply to t-maxxmaniac)
       Post #: 31

RE: T-maxx wants to go only in reverse - 7/19/2008 2:46:37 AM   
bud_senior150


 

Posts: 55
Joined: 7/15/2008
From: Cheektowaga, NY, USA
Status: offline 		thanks but i cant get it started. Tommorow i will let how it goes. thanks for the help so far.

(in reply to t-maxxmaniac)
       Post #: 32

RE: T-maxx wants to go only in reverse - 7/20/2008 11:46:03 AM   
st1_racer



Posts: 1045
Joined: 12/29/2006
From: Cheektowaga, NY, USA
Status: offline 		well i got it started it runs really rich, but during idle it shook trying to go why?

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RE: T-maxx wants to go only in reverse - 7/20/2008 5:39:44 PM   
NitroVenom



Posts: 2995
Joined: 3/12/2006
From: North Babylon, NY, USA
Status: offline
quote:

ORIGINAL: st1_racer

well i got it started it runs really rich, but during idle it shook trying to go why?


Lean it out some and it will help cure the problem. The reason it shakes/jerks during take off is because the pawls in the tranny aren't fully engaging due to throttle sensitivity like like DaveG55 said. There is a "no buck mod" that you can do to prevent this but I dont know how to do it. My guess would be having to lock the pawls so there constantly engaged. Dave knows how to do this. I unfortunantly don't. PM him about it or maybe he'll chime in with that answer.

Here are some tuning vids you can follow not the same truck but same concept)

Part 1

Part 2

< Message edited by NitroVenom -- 7/20/2008 5:40:14 PM >

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       Post #: 34

RE: T-maxx wants to go only in reverse - 7/20/2008 9:23:28 PM   
bud_senior150


 

Posts: 55
Joined: 7/15/2008
From: Cheektowaga, NY, USA
Status: offline 		what his username?

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       Post #: 35

RE: T-maxx wants to go only in reverse - 7/20/2008 9:46:51 PM   
DaveG55



Posts: 6444
Joined: 1/12/2005
From: Stockbridge, GA, USA
Status: offline 		I think he means me.
It shakes/jerks/jumps/bucks at idle and take off because of the internal transmission components that prevent you from shifting from forward to reverse while moving. It's what is probably causing your shifting problems too. Once the truck is tuned and idling properly the bucking goes away at idle and is only noticable when taking off slowly. The shifting problems should go away too unless they are caused by a binding somewhere in the shifting linkage/ fork system. The mechinism that prevents shifting is a type of centrifical clutch system where a set of pawls expand and engage the drum that powers the final drive shaft. if the rpm is fast enough to cause those pawls to extend then the truck tries to move (the jumping) but once they do engage it pulls the internal rpms down and the pawls disengage. Repeat, repeat, repeat = jump, jump, jump....
There are onlly two ways to eliminate the jumping. One is to replace the internal gears with a forward-only-conversion (FOC). The jumping goes away but so does reverse. There are avantages to having no reverse but, to me - being lazy and all, I prefer having reverse over the power /weight gains. So that only leaves one other option. The "constant engagement/no buck" modification. Rather than go into what is involved I'll post a link with detailed instruction tha explains the whole process much better than I can.
Good Luck.

the link
http://monster.traxxas.com/showthread.php?t=268460&highlight=constant+engagement

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RE: T-maxx wants to go only in reverse - 7/21/2008 3:30:39 AM   
NitroVenom



Posts: 2995
Joined: 3/12/2006
From: North Babylon, NY, USA
Status: offline 		Thanks Dave, yea thats what I was talking abut. Now I know how to do it also Good Link too.

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When In Doubt, Throttle Out

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RE: T-maxx wants to go only in reverse - 7/21/2008 6:15:26 AM   
matts6887



Posts: 1582
Joined: 3/27/2008
From: scottsdale, AZ, USA
Status: offline 		That is a pretty interesting and very good link there dave. I may have to consider doing that mod to my revo to eliminate any possible problems that could crop up...

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RE: T-maxx wants to go only in reverse - 7/21/2008 5:42:27 PM   
iamnot


 

Posts: 1043
Joined: 9/18/2007
From: noyb, USA
Status: offline
quote:

ORIGINAL: matts6887

That is a pretty interesting and very good link there dave. I may have to consider doing that mod to my revo to eliminate any possible problems that could crop up...


why?
the revo transmission is not made the same way as the t-maxx one is.
there are no pawls in it. that's what the opti-drive is for

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RE: T-maxx wants to go only in reverse - 7/21/2008 7:39:48 PM   
beer=food


 

Posts: 1276
Joined: 11/26/2007
From: hervey bay, AUSTRALIA
Status: offline 		T-maxx wants to go only in reverse, hhmmmm, sounds normal to me, LOL ! Probly faster in reverse anyways , hahaha, just turn the body shell around, she'll be right mate, bonza, good to go, you think lm joking dont you ? ! ...... LOL ! hahaha ok ok just get that FROG l mentioned some other day.

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my revo is a bird, my baja a brick,
when l get em airbourne, its really quite sick,
all fun and games till they come back down,
and l land em like a frootloop backwards-arss clown !

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