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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Truggy >> XTM Racing Mammoth ST
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XTM Racing Mammoth ST - 1/23/2008 11:05:39 PM   
HPIChadder


 

Posts: 14
Joined: 1/14/2008
From: Denver, NC, USA
Status: offline 		I put this post in a stadium truck forum but they said, try the truggy forum, even though its a stadium

So i just got this truck /\ and I was wondering whether or not this is a good truck?
It's got a 24.7? (never seen a motor classified like that) big block
If anyone knows anythign about this truck let me know ex. Is it good? How's it run? well built? etc.

Thanks guys!
       Post #: 1

RE: XTM Racing Mammoth ST - 1/23/2008 11:32:49 PM   
INTEGRA



Posts: 1785
Joined: 7/29/2005
From: winnipeg, MB, CANADA
Status: offline 		the truck has issues to say the least....im sure some 1 else will chime in with some help.

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(in reply to HPIChadder)
       Post #: 2

RE: XTM Racing Mammoth ST - 1/23/2008 11:34:34 PM   
jombo



Posts: 2417
Joined: 4/27/2005
From: trumbull, CT, USA
Status: offline 		its a god truck and the motor is a reliable motor, the only problem with the truck from what i gatherd is the front and rear bracing. there is a place that you can get a chassi brace for it to stop it from flexing, the company is called dadders braces.com. once you put that bracing system in the truck it will be a tank. tryed searching for dadders brace and think its not around any more

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ka-chow
lst2, there is no substitute lst forums, ground pounders rc

(in reply to HPIChadder)
       Post #: 3

RE: XTM Racing Mammoth ST - 1/23/2008 11:36:53 PM   
jombo



Posts: 2417
Joined: 4/27/2005
From: trumbull, CT, USA
Status: offline 		integra its the mammoth st not the mammoth monster truck that had many issues.

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ka-chow
lst2, there is no substitute lst forums, ground pounders rc

(in reply to INTEGRA)
       Post #: 4

RE: XTM Racing Mammoth ST - 1/24/2008 4:15:12 AM   
dittch


 

Posts: 171
Joined: 8/1/2006
From: Lafayette, IN, USA
Status: offline 		this opinion is coming from someone who doesn't race, just a basher. the chassis needs some firming, but you can fix that with a piece of 7/16" or bigger aluminum rod, a drill, and a tap. Drill and tap both ends to accept a screw. I think I used an 8-32 tap/screw. Drill holes in each shock tower and put it between them. With the cooling head of the engine in the way, it will be more towards the passenger side. It essentially serves as an upper chassis. I have done this and had no problems. I mounted an iron bumper onto my ST to make it a destruction machine. I have hit everything from produce to an old TV (last weekend). It stands firm with my $5.00 chassis brace. I always had problems with the chassis bending, but putting that brace on ended it. I had the brace on long before I put the bumper on.

One problem I had was with the differential shimming. I would shim them with the 0.1 or 0.2mm shims but they would wear out and I would have to re-shim. It was obvious when they wore because the gears would skip. I finally found a fix for these cheap shims. I ordered 8X14mm stainless shims (0.2mm thick) from mcmastercarr.com (part number A370-919). I replaced the cheap XTM shims with these (about 3-5 in each diff, varies and can be higher). No problems since.

I also installed a 1/5 scale steering servo. To make it fit I had to relocate the receiver box...on top of the servo. Made custom mounts for it using ABS plastic from mcmastercarr of course. I needed more steering torque with the 1.5 pound iron bumper, but even without it the steering servo wasn't impressive. Steering is now amazing, and the tower servo was only $30. It is a true basher

Oh, and as far as 1/8 scale car engines go, the .247 is a nice powerplant. I have an Hobao Mach 28 in mine now and the performance is essentially the same. In this case, bigger wasn't better, but I got the engine rediculously cheap on ebay so had to try

< Message edited by dittch -- 1/24/2008 4:17:21 AM >

(in reply to HPIChadder)
       Post #: 5

RE: XTM Racing Mammoth ST - 1/24/2008 5:16:15 AM   
ssj2



Posts: 2227
Joined: 10/12/2005
From: Niles, IL, USA
Status: offline 		I think there is an official Mammoth ST thread lingering around the truggy forum a few of pages back...

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Mugen MBX5T Prospec
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       Post #: 6

RE: XTM Racing Mammoth ST - 1/24/2008 5:31:29 AM   
dittch


 

Posts: 171
Joined: 8/1/2006
From: Lafayette, IN, USA
Status: offline
quote:

ORIGINAL: ssj2

I think there is an official Mammoth ST thread lingering around the truggy forum a few of pages back...

yup, and a very good read it is

http://www.rcuniverse.com/forum/m_4451350/mpage_1/key_mammoth/tm.htm

(in reply to ssj2)
       Post #: 7

RE: XTM Racing Mammoth ST - 1/25/2008 1:35:11 AM   
ssj2



Posts: 2227
Joined: 10/12/2005
From: Niles, IL, USA
Status: offline
quote:

ORIGINAL: dittch


quote:

ORIGINAL: ssj2

I think there is an official Mammoth ST thread lingering around the truggy forum a few of pages back...

yup, and a very good read it is

http://www.rcuniverse.com/forum/m_4451350/mpage_1/key_mammoth/tm.htm

There ya go, thanks for posting that up and I second dittch that the thread IS a good read.

_____________________________

Mugen MBX5T Prospec
92% of teens have switched to rap music if you are part of the other 8% put this in your sig

(in reply to dittch)
       Post #: 8

RE: XTM Racing Mammoth ST - 6/8/2008 4:02:41 AM   
Sholaway


 

Posts: 3
Joined: 6/8/2008
From: sHERMAN, TX, USA
Status: offline 		Greetings,

I just wanted to pop in and tell everyone reading a story about my XTM Racing MAMMOTH ST so here we go.
I went to hobby shop to look at offroad cars I have had a on road car for years bought used from hobby shop owner (his personal toy) so im not a young dumb rookie I am 40 years old and not at all new to nitro cars so with that said.

I went to shop to purchase Traxxus REVO hobby shop owner said “DUDE that xtm mammoth st is faster, tougher, and by far more stable not to mention $150.00 cheaper”
(FIRST CLUE)

Day 1
Bring home unpack fill tank with fuel and begin long break-in process (im gonna do it by the book) several tanks of fuel (about ½ gallon) and several hours later the sun drops behind the horizon so I pack it up and put it on charger.

Day 2
Can’t wait to get off work to come home and actually see what this new toy has to offer.
So here we are again im STOKED I am soooo ready to air this new toy out. Just a bit more break in time and I can start tuning for performance.
OK one tank down and and now I can start going fast. Man this thing has got some go. Whats this no steering lets see maybe interfeance so I walk over closer to car and its smoking I look inside and the steering servo is toasting so I turn car off.

RECAP
I have run a total of just a little over ½ gallon of fuel through this truck it is 2 days old and now broke.

Day 3
Call Global Hobby (distributor for XTM Racing) they say no problem get you a new servo right away. Im like COOL thanks. I thought it would be a big hassle but it wasn’t.
Ok 4 days later I get new servo and install its too dark to run so put on charger.

Day 7
Fill tank with fuel and im ready to play I make a small ramp to get oh about 2 foot of air with grass for landing. About ¾ of a tank of fuel and I hear clicking ok its just leftover pecan shells left by my squirrel friends…….NOPE not 30 seconds later I hear engine rev and car is stopped. So I take car into shop and check it out …. Results …. Both front and rear pinion gears are missing teeth.
Ok back on phone with Global Hobby this time not so easy they insist I abused car after much discussion (not pleasant enough to post) they agree to look at damage and replace if manufacturer defect so I pack it up and send it to them. 6 days later I have two new diffs in mail.

Day 8
SWEET im gonna get to play… install diffs fill with fuel run full tank out and decide ill charge and play next day

Day 9
Fill tank go out still tuning carb for just the right performance but not too much heat and about ½ tank throttle servo starts acting irratic thought interfearance again and shut down let it cool off turned car on and have steering but throttle servo is dead.

DAMN IM BROKE AGAIN this time must send to HITE/RCD, INC for warranty no phone number or e-mail just address.

Needless to say I have had the car for less than two weeks and its been broke more than its been running SO if given the choice I would highly recommend NOT buying the MAMMOTH ST it is impressive looking truck but my experience speaks for itself
Anyone else have a similar story to share?

(in reply to ssj2)
       Post #: 9

RE: XTM Racing Mammoth ST - 6/9/2008 12:23:43 AM   
traxxasracer_4


 

Posts: 117
Joined: 4/1/2007
From: north huntingdon, PA, USA
Status: offline 		i have an ST. its almost 3 years old now and i havent had a problem with the truck itself. however the stock engine like some RTR engines wasnt great so it was replaced by an Axial .28 rr (partially my fault for cold storage) the only other problem i had was that the radio that came in the box was defective but i returned that the day after i got it. all in all it is a good truck if you have a good setup, at the local track mine can whoop on hyper st's and st-1's all day. as for chassis bracing i cant complain b/c the flex is kinda supposed to be there, most truggs have chassis flex b/c they are big racing trucks and it can help their track performance.

_____________________________

DON''T KNOCK THE MAMMOTH. "92% of teens have switched to rap music if you are part of the other 8% add this to your sig

(in reply to Sholaway)
       Post #: 10

RE: XTM Racing Mammoth ST - 6/13/2008 3:34:32 PM   
traxxasracer_4


 

Posts: 117
Joined: 4/1/2007
From: north huntingdon, PA, USA
Status: offline 		in case anybody wanted to take a look.....

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_____________________________

DON''T KNOCK THE MAMMOTH. "92% of teens have switched to rap music if you are part of the other 8% add this to your sig

(in reply to INTEGRA)
       Post #: 11

RE: XTM Racing Mammoth ST - 6/13/2008 4:04:23 PM   
INTEGRA



Posts: 1785
Joined: 7/29/2005
From: winnipeg, MB, CANADA
Status: offline 		ummm...FYI fuel line and pressure line are supposed to be arouind 8-10 inch's.

_____________________________

http://s150.photobucket.com/albums/s102/davidmoxley123/
http://s49.photobucket.com/albums/f285/TrUInTeGrA123/

(in reply to traxxasracer_4)
       Post #: 12

RE: XTM Racing Mammoth ST - 6/13/2008 4:13:57 PM   
slayerphonics



Posts: 2092
Joined: 3/2/2007
From: Daytona Beach, FL, USA
Status: offline
quote:

ORIGINAL: INTEGRA

ummm...FYI fuel line and pressure line are supposed to be arouind 8-10 inch's.


why?

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(in reply to INTEGRA)
       Post #: 13

RE: XTM Racing Mammoth ST - 6/13/2008 5:05:45 PM   
Anomie