build own MT
#2
Senior Member
Join Date: Jul 2005
Location: Torchy the Fiery Fast RC Turtl
Posts: 10,544
Likes: 0
Received 0 Likes
on
0 Posts
RE: build own MT
Other than custom fabricating your own parts, I dont know where you can get parts to built a gas MT with existing OEM parts. It might be possible to take a Baja 5T and convert that from a CORR type truck into an MT, I guess going with the MT wheels with squares and using adaptors to get the 5T to mount the MT wheels would be a first step.
Then redoing the suspension is a must, changing the geometry such that the arms ride higher and he MT wheel will clear the shell and side splash guards.
Also, if possible, going with 8 shocks might be best to absorb big jumps. If you double up on the stock HPI 5T shocks (having 8 total), I suggest you go with a lighter weight shock oil, one that is a quarter less or a 3rd less in oil weight. As for springs, I dont know. Maybe some with a K constant (Hooke's elastic constant) that is a quarter less or a third less than the stock 5T's K constant.
Of course, mounting 8 shocks will definitely require modding the arms to mount 8 shocks and the shock towers too to also mount the upper ends of the 8 shocks.
As for the arms, I have no clue if the 5T's arms can be raised up at a steeper angle for increased ground clearance under the belly.
MTs also typically are 4WD, I do not know of an easy way to convert a 5B or 5T into 4WD. Alot of fab work would be required.
Also, many MTs are multi-speed (2speed & 3speed). Well, I am thinking of Nitro MTs. I dont think Gasser MTs come in multi-speed. But if you want multi-speed, I guess you can buy the FG 2speed gear set, get optional gears to get good gear ratios you want, and try to make that fit into the Baja gear box. Unfortunately, you will have to get gear axles of the correct length with face facets cut in the proper places or else it is a failure.
Then redoing the suspension is a must, changing the geometry such that the arms ride higher and he MT wheel will clear the shell and side splash guards.
Also, if possible, going with 8 shocks might be best to absorb big jumps. If you double up on the stock HPI 5T shocks (having 8 total), I suggest you go with a lighter weight shock oil, one that is a quarter less or a 3rd less in oil weight. As for springs, I dont know. Maybe some with a K constant (Hooke's elastic constant) that is a quarter less or a third less than the stock 5T's K constant.
Of course, mounting 8 shocks will definitely require modding the arms to mount 8 shocks and the shock towers too to also mount the upper ends of the 8 shocks.
As for the arms, I have no clue if the 5T's arms can be raised up at a steeper angle for increased ground clearance under the belly.
MTs also typically are 4WD, I do not know of an easy way to convert a 5B or 5T into 4WD. Alot of fab work would be required.
Also, many MTs are multi-speed (2speed & 3speed). Well, I am thinking of Nitro MTs. I dont think Gasser MTs come in multi-speed. But if you want multi-speed, I guess you can buy the FG 2speed gear set, get optional gears to get good gear ratios you want, and try to make that fit into the Baja gear box. Unfortunately, you will have to get gear axles of the correct length with face facets cut in the proper places or else it is a failure.
#3
Senior Member
Join Date: Aug 2006
Location: somewhere
Posts: 3,237
Likes: 0
Received 0 Likes
on
0 Posts
RE: build own MT
they are so intelligent at inventing 2 speed and 3 speed gearboxes for thier HPI nitro MT'S but when it comes to large scale they take the easiest and simple wayout with single speed direct drive . Its a disgrace that hpi will not even try or want to try making a 2 or 3 speed for thier next large scale HPI gasser , so nah here you go enjoy your 5T that is similar to the first one lol
#4
Banned
Join Date: Jan 2008
Location: lawton, OK
Posts: 346
Likes: 0
Received 0 Likes
on
0 Posts
RE: build own MT
ORIGINAL: splcrazy
they are so intelligent at inventing 2 speed and 3 speed gearboxes for thier HPI nitro MT'S but when it comes to large scale they take the easiest and simple wayout with single speed direct drive . Its a disgrace that hpi will not even try or want to try making a 2 or 3 speed for thier next large scale HPI gasser , so nah here you go enjoy your 5T that is similar to the first one lol
they are so intelligent at inventing 2 speed and 3 speed gearboxes for thier HPI nitro MT'S but when it comes to large scale they take the easiest and simple wayout with single speed direct drive . Its a disgrace that hpi will not even try or want to try making a 2 or 3 speed for thier next large scale HPI gasser , so nah here you go enjoy your 5T that is similar to the first one lol
#5
Thread Starter
Join Date: May 2007
Location: singapore, SINGAPORE
Posts: 884
Likes: 0
Received 0 Likes
on
0 Posts
RE: build own MT
well as i thought if the original hpi front lower arm is estimated to be 15mm long & front upper arm is estimated to be 10mm
den i would maybe extend it to be lower arm is estimated to be 20mm long n front upper arm is estimated to be 15mm
i would just add 5mm extra & it should be ok to be above ground wen the tyre touch down.
as for savage wat he said is true abt the MT wheels with squares and using adaptors to get the 5T to mount the MT wheels would be a first step.so that i can change the rim n wheel into bigger tyres.
den i would maybe extend it to be lower arm is estimated to be 20mm long n front upper arm is estimated to be 15mm
i would just add 5mm extra & it should be ok to be above ground wen the tyre touch down.
as for savage wat he said is true abt the MT wheels with squares and using adaptors to get the 5T to mount the MT wheels would be a first step.so that i can change the rim n wheel into bigger tyres.
#6
Senior Member
Join Date: Jul 2005
Location: Torchy the Fiery Fast RC Turtl
Posts: 10,544
Likes: 0
Received 0 Likes
on
0 Posts
RE: build own MT
ORIGINAL: bsrman14
It's all about the $$$$$. How much profit and how cheap they can make it to sell to YOU.
ORIGINAL: splcrazy
they are so intelligent at inventing 2 speed and 3 speed gearboxes for thier HPI nitro MT'S but when it comes to large scale they take the easiest and simple wayout with single speed direct drive . Its a disgrace that hpi will not even try or want to try making a 2 or 3 speed for thier next large scale HPI gasser , so nah here you go enjoy your 5T that is similar to the first one lol
they are so intelligent at inventing 2 speed and 3 speed gearboxes for thier HPI nitro MT'S but when it comes to large scale they take the easiest and simple wayout with single speed direct drive . Its a disgrace that hpi will not even try or want to try making a 2 or 3 speed for thier next large scale HPI gasser , so nah here you go enjoy your 5T that is similar to the first one lol
But as for HPI making a 5th scale 2speed option, They should be able to make it cheaply, they make it all in Taiwan. Taiwan has labor and manufacting costs that are just a little more than making something in mainland china. So, I really believe that it is possible for HPI to make such an upgrade that would cost in the $100-$150 USD range for the end user.
#7
Senior Member
Join Date: Jul 2005
Location: Torchy the Fiery Fast RC Turtl
Posts: 10,544
Likes: 0
Received 0 Likes
on
0 Posts
RE: build own MT
ORIGINAL: wan6176
well as i thought if the original hpi front lower arm is estimated to be 15mm long & front upper arm is estimated to be 10mm
den i would maybe extend it to be lower arm is estimated to be 20mm long n front upper arm is estimated to be 15mm
i would just add 5mm extra & it should be ok to be above ground wen the tyre touch down.
as for savage wat he said is true abt the MT wheels with squares and using adaptors to get the 5T to mount the MT wheels would be a first step.so that i can change the rim n wheel into bigger tyres.
well as i thought if the original hpi front lower arm is estimated to be 15mm long & front upper arm is estimated to be 10mm
den i would maybe extend it to be lower arm is estimated to be 20mm long n front upper arm is estimated to be 15mm
i would just add 5mm extra & it should be ok to be above ground wen the tyre touch down.
as for savage wat he said is true abt the MT wheels with squares and using adaptors to get the 5T to mount the MT wheels would be a first step.so that i can change the rim n wheel into bigger tyres.