Designing a small buggy as side by side (UTV)

neneossa

Well-Known Member
Joined
Dec 18, 2012
Posts
97
RDC Crypto
59
Location
Chile
Hello, this week Ive started designing my third buggy. The intention of this one is to build something smaller than a buggy, using some dimensions of UTV as wheel base and track width. I drive mainly in sand dunes and the road are to narrow to use my other buggy (100" width)

The number up to now are:
Wheel base: 100"
Width: 78"
Front wheel travel:18", unequal a-arm, Fox Podium 2.5 Internal bypass 10"
Rear wheel travel: 16" Trailing arm, to be defined if 3 link or typical trailing arm. Fox Podium 30 Internal bypass 16"
Tire and wheel: 31x10,5 tire and 15x8 with beadlock wheel
Chassis: A53 seamless pipe 1 1/4 (main parts) and 1 1/2 tube 2mm
Mid engine
Engine: Nissan SR20VET 280HP turbo 228 lb⋅ft
Transmission: Subaru 9R WRX 5 speed MT 4x2
Rear CV joints: 930 CV 22-24°. A good alternative is try to fit can am X3

Im managin an alternative to buy a reverse drive crown for subaru to put the engine back and use the AWD transmission to connect the rear diff of the car as fornt diff and get 4x4 permanent. Right now is under evaluation. I love the idea to convert the buggy to 4x4.

I'll be uploading information daily in
www.facebook.com/opcdesign
www.instagram.com/opc.design
 

Attachments

  • 05.jpg
    05.jpg
    127.3 KB · Views: 0
  • 03.jpg
    03.jpg
    126.3 KB · Views: 0
  • 04.jpg
    04.jpg
    101.5 KB · Views: 0
  • 01.jpeg
    01.jpeg
    98.4 KB · Views: 0
  • 06.jpg
    06.jpg
    116.3 KB · Views: 0
  • 02.jpg
    02.jpg
    95.5 KB · Views: 0
  • 07.jpg
    07.jpg
    571.9 KB · Views: 0
  • 08.jpg
    08.jpg
    1.5 MB · Views: 0

E.Hagle

Well-Known Member
Joined
Mar 5, 2020
Posts
1,114
RDC Crypto
2,425
Location
Somis, CA
I like the look. Except I’m curious about the door bar design and why the bend instead of an X ?

Is that fusion 360?
 
Advertising supports this site

neneossa

Well-Known Member
Joined
Dec 18, 2012
Posts
97
RDC Crypto
59
Location
Chile
I like the look. Except I’m curious about the door bar design and why the bend instead of an X ?

Is that fusion 360?
Me last buggy that I designed had a x in the door so I want to change a ilttle bit the design so the idea is to create the x But bending the tubes and welding it between them.

It is solidworks
 

E.Hagle

Well-Known Member
Joined
Mar 5, 2020
Posts
1,114
RDC Crypto
2,425
Location
Somis, CA
Me last buggy that I designed had a x in the door so I want to change a ilttle bit the design so the idea is to create the x But bending the tubes and welding it between them.

It is solidworks
Solidworks, man I envy you. If you’re just out in the dunes and having fun I guess the small amount of strength isn’t the end of the world. I would bet my money that x is a little tougher if you were side blinded in a bad situation.
 

michael.gonzalez

Well-Known Member
Joined
Mar 13, 2018
Posts
6,115
RDC Crypto
2,747
Location
Camarillo, CA
Website
www.facebook.com
Hello, this week Ive started designing my third buggy. The intention of this one is to build something smaller than a buggy, using some dimensions of UTV as wheel base and track width. I drive mainly in sand dunes and the road are to narrow to use my other buggy (100" width)

The number up to now are:
Wheel base: 100"
Width: 78"
Front wheel travel:18", unequal a-arm, Fox Podium 2.5 Internal bypass 10"
Rear wheel travel: 16" Trailing arm, to be defined if 3 link or typical trailing arm. Fox Podium 30 Internal bypass 16"
Tire and wheel: 31x10,5 tire and 15x8 with beadlock wheel
Chassis: A53 seamless pipe 1 1/4 (main parts) and 1 1/2 tube 2mm
Mid engine
Engine: Nissan SR20VET 280HP turbo 228 lb⋅ft
Transmission: Subaru 9R WRX 5 speed MT 4x2
Rear CV joints: 930 CV 22-24°. A good alternative is try to fit can am X3

Im managin an alternative to buy a reverse drive crown for subaru to put the engine back and use the AWD transmission to connect the rear diff of the car as fornt diff and get 4x4 permanent. Right now is under evaluation. I love the idea to convert the buggy to 4x4.

I'll be uploading information daily in
www.facebook.com/opcdesign
www.instagram.com/opc.design
Be mindful of the limitations of the reverse cut ring and pinion with power. We ran our AWD buggy for a season with a EJ25 pushing ~350hp in Glamis and the ring and pinion couldn’t hang. Those ring and pinions aren’t cheap either!! Ending up swapping in a mendeola and going back to rwd.

You may have better luck with your setup though. AWD is a blast in the dunes! Total game changer on what you can and can’t do. Sometimes I miss it.
 

neneossa

Well-Known Member
Joined
Dec 18, 2012
Posts
97
RDC Crypto
59
Location
Chile
Have you seen a Side by side door? Can-am or Polaris… that is nothing.. the X member here is a tube of 42mm diameter per 3.6 mm of thickness. Anyway, when the design being finished, I had to check the roll cage design hitting big forces in different points of the cage in order to see what are the weakness parts and then reinforce if is necessary! I I will post that analysis when it is done.
 

neneossa

Well-Known Member
Joined
Dec 18, 2012
Posts
97
RDC Crypto
59
Location
Chile
Be mindful of the limitations of the reverse cut ring and pinion with power. We ran our AWD buggy for a season with a EJ25 pushing ~350hp in Glamis and the ring and pinion couldn’t hang. Those ring and pinions aren’t cheap either!! Ending up swapping in a mendeola and going back to rwd.

You may have better luck with your setup though. AWD is a blast in the dunes! Total game changer on what you can and can’t do. Sometimes I miss it.
For now the design is considering mid engine with Subaru wrx transmission but id love to convert it to awd but my concern is this R&P could hang the engine torque. The good thing of awd you distribute torque and power 50/50 between both ends so it should be support the stress.
A mendeola wold be the best but is too expensive to Import to chile (South America) taxes and shipping.
 
Advertising supports this site

jon coleman

in n out.double double w cheese
Joined
Jan 17, 2019
Posts
14,987
RDC Crypto
9,506
Location
sandiego
gotta lock the viscous coupler, drill it, and use steel dowl pins, you toob video out there, auto trans is a clutch disk pack like a motorcycle, i had to weld mine up and make it a rwd only,i also ginded down front drive gear so old broken fwd is out of the picture, strictly rwd, front r&p poppped, got about 3000 miles on it so far, better mpg!, got rid of old front cv axles too ( note, if your awd subaru auto chatters Really bad making a sharp turn, its because the steel drive plates have cut into the clutch basket and are Not releasing from drive plates, hi mileage subi's)the rear diffs are farely strong, drifter guys use em , & there are a S load at the junk yard, i would build it rear engine, flip the rear diff& stick it up front, main trans diff,,,,, can it be flipped😬? i looked a little, maybe after market reverse cut r& p's is the answer so you can reverse rotate, research & home work time👍
 
Last edited:

jon coleman

in n out.double double w cheese
Joined
Jan 17, 2019
Posts
14,987
RDC Crypto
9,506
Location
sandiego
i also think there is a viscous coupler eliminator kit out there allready, i would go this route because subarus are Everywhere, Lottsa them in the junk yards, as for running the stock rear diff up front, just flip the Whole unit, modify the oiling / passages to make sure every thing is OIL happy upside down
 
Last edited:

neneossa

Well-Known Member
Joined
Dec 18, 2012
Posts
97
RDC Crypto
59
Location
Chile
I was checking the space to install the subaru diff in the fornt end but is a little bit complicated. First of all, the front travel will be less than the current due to CV joints. Also there is not enough space for the steering rack and ís important to check the bumpsteer. I had to turn the engine position and relocare the front shock support in order to get space for the half-shaft but is ok.
Id like to see if its possible to adapt can-am X3 CV joints that have 40° of angle.


09.jpg
10.jpg
11.jpg
12.jpg
 

bullnerd

Well-Known Member
Joined
Aug 24, 2007
Posts
421
RDC Crypto
228
Location
Creamridge NJ
Widen the front track to match the back (or wider?) and regain the travel.

What's the hoop in front of the pedals for? Dead tubes at the frame?

Frame looks cool! Nice job so far.
 

neneossa

Well-Known Member
Joined
Dec 18, 2012
Posts
97
RDC Crypto
59
Location
Chile
Widen the front track to match the back (or wider?) and regain the travel.

What's the hoop in front of the pedals for? Dead tubes at the frame?

Frame looks cool! Nice job so far.

Only in the image the rear end is wider than the front end casue i moved the tires to check interferances but is the same width for both ends ( 78") and is enough for sand dunes where the roads are very narrow

When you ask for the hopp you mean this one?

That is to sopport the tubes to install the brackets for the upper arms

1653582876153.png


Thnaks for your comments
 
Advertising supports this site

bullnerd

Well-Known Member
Joined
Aug 24, 2007
Posts
421
RDC Crypto
228
Location
Creamridge NJ
Only in the image the rear end is wider than the front end casue i moved the tires to check interferances but is the same width for both ends ( 78") and is enough for sand dunes where the roads are very narrow

When you ask for the hopp you mean this one?

That is to sopport the tubes to install the brackets for the upper arms

View attachment 245233

Thnaks for your comments
Yes that one.

Im not telling you what to do because I'm no expert, Just suggesting, But I would go back and take a look, You have a lot of dead tubes in this area.

398153.10.jpg
 

neneossa

Well-Known Member
Joined
Dec 18, 2012
Posts
97
RDC Crypto
59
Location
Chile
Yes that one.

Im not telling you what to do because I'm no expert, Just suggesting, But I would go back and take a look, You have a lot of dead tubes in this area.

View attachment 245253
Yes, you are right, in fact in some places like the rear of the car I need to put more tubes and in the front add some and remove others.

I have to make a decision on whether it will be AWD or 4x2. The final design of the front and back will depend on the selected configuration. Anyway that arc must be fixed in order to avoid movements when the front suspension hit the ground
 

neneossa

Well-Known Member
Joined
Dec 18, 2012
Posts
97
RDC Crypto
59
Location
Chile
Yes that one.

Im not telling you what to do because I'm no expert, Just suggesting, But I would go back and take a look, You have a lot of dead tubes in this area.

View attachment 245253
When I finished the design I´ll run the math for the model. A good example is this case, a front crash (it show at big scala how the cage will be deformed. Of course, is necessary more parts here that will help to reduce the shares in the specific areas

1653602938603.png
 

E.Hagle

Well-Known Member
Joined
Mar 5, 2020
Posts
1,114
RDC Crypto
2,425
Location
Somis, CA
AWD or selectable 4x4 ?

If it was first go around building a chassis I would build it RWD to get my feet wet. Not sure how much fabrication you’ve done in your day though.

I imagine you could save yourself at least $15k easy in parts by avoiding AWD and quite a few headaches. Or go full send on her and we’ll sit back and cheer you on.
 

neneossa

Well-Known Member
Joined
Dec 18, 2012
Posts
97
RDC Crypto
59
Location
Chile
AWD or selectable 4x4 ?

If it was first go around building a chassis I would build it RWD to get my feet wet. Not sure how much fabrication you’ve done in your day though.

I imagine you could save yourself at least $15k easy in parts by avoiding AWD and quite a few headaches. Or go full send on her and we’ll sit back and cheer you on.
AWD. I have the subaru transmission with the rear diff so the plan is to reverse the transmission with the reverse drive R&P and install the driveshaft from the transmission to the front diff.

The easy and cheap way forward at the moment is to build a mid-engined buggy and I think I'll go with that setup.

I built 2 buggies and they were sold. Now I am designing and I hope to start building in the next week, while the tubes arrive at my workshop I am preparing the drawings.
 

partybarge_pilot

Well-Known Member
Joined
Feb 19, 2002
Posts
7,036
RDC Crypto
1,997
Location
Easton, KS
Mid engine. Then use a chain or gear box to reroute the driveshft to the front.

Cheaper than buying reverse cut gears.

Downside is you are stuck with the stock gear ratio.

Or, rear engine with stock gears and use portal hums to get the gearing you need and correct rotation.
 
Top