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Thread: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

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Old 01-30-2019, 06:27 PM   #41
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

I grabbed a set of slash 4x front axles on the way home and they fit great, the inner and outer spindle bearings are a perfect match. The spindle will need to be about 0.05" wider because the slash axle is wider but that's no big deal this early in the design process, I can just shorten the lower control arm or move the pivot point in a little more.

I'm not sure how long the axles need to be, that will be determined by the arm length and where I can get the diff to sit. Working on modeling up the axles and diff tubes right now.
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Old 01-30-2019, 07:42 PM   #42
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Are there any parts from the front end of a Traxxas 4tec 2.0 which may be useful here? When I get home tonight I can put a set of 1.9s or 1.55s on to see if they'll fit. I've already removed the fake disc calipers from mine to accommodate a broader ranger of wheels than the stock Traxxas ones.

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Old 01-30-2019, 08:03 PM   #43
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Doesn't really look like there is any useful parts there.
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Old 01-30-2019, 09:33 PM   #44
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Mocked up the rear end, going to have to move the rear shock towers forward more. Have the front axle drawn up, I don't like it and the diff has to be centered, I feel like this takes away from the scale factor. I cant really see it going any other way though.



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Old 01-31-2019, 04:45 AM   #45
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Thats beautiful. Can you cycle the suspension in your program? Looks full scale in my phone (axle diameter), and cycling to full bump or droop in my head says you need longer axles to cycle 37 mm, not enough plunge out from ride height where it is now. Please tell me it isn't so.
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Old 01-31-2019, 09:07 AM   #46
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Thanks! I will be able to cycle the suspension and see the axle plunge characteristics once I define the top arm and inner pivot points, right now if I try to move it, it will all just fall apart. The axle does look short but 30 mm really isn't that much travel. You're also seeing this at ride height, so the axle would only expand from this point.
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Old 01-31-2019, 09:21 AM   #47
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Cool build
My 1:1 full independent suspention wheeler has centered pumpkins front and rear from the factory i know it isent a problem with this rig or most rigs that run this type of set up cause there rear wheel drive and the front dosent do much but axle rap from a offset pumpkin sucks the rig allways pulls to one side just sayin

In my opinion the centered front is alot better and still scale
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Old 01-31-2019, 09:34 AM   #48
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Thanks for the input, that's helpful!
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Old 01-31-2019, 12:07 PM   #49
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Quote:
Originally Posted by RadioFlyer View Post
Along the lines of Tamiya TT01/TT02 geometry and without a C-hub?



Upon second thought, the swing shafts and cups might actually work well for this, I can't find any locally to test though, and I don't want to wait a month to get them from HK, anyone have some units they could take some measurements for me?
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Old 01-31-2019, 02:28 PM   #50
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

I like where this is going. I have a 1st gen Durango 1:1 myself and one of these bodies too. Still can't decide on a street version or off-roader.

The 1/16 sized Traxxas vehicles have quite a bit to offer in the smaller sizes you're looking for, especially the VXL version parts, since they're made with reinforced materials. They also should fit 1.9 rims, since they use 12mm hex and proprietary rims.

I've always thought that the rear suspension on the 1/16 E-Revo and Slash 4x4, have more scale appearance than the front, for an IFS...just ignore the shock set up.




Can't wait to see what you come up with...
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Old 01-31-2019, 02:41 PM   #51
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Interesting insight, yes the inspiration behind this is my winter beater 1st gen Durango. The body style has grown on me quite a bit.

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Old 01-31-2019, 02:56 PM   #52
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Nice! General Grabbers AT3 are excellent winter tires on these.
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Old 01-31-2019, 08:06 PM   #53
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Quote:
Originally Posted by jonnywachter View Post
Upon second thought, the swing shafts and cups might actually work well for this, I can't find any locally to test though, and I don't want to wait a month to get them from HK, anyone have some units they could take some measurements for me?






TT01 shafts F/R:
39mm OAL
6mm body dia.
9mm ball dia.
30mm pin-to-pin on center
3mm pin


Inner cup:
29mm OAL
15mm cup (plastic)
10mm plunge but shaft bottoms out at 7mm to allow for working angle
5mm dia. shaft, 14mm in length with 1mm bearing shoulder

Front outer cup:
42mm OAL
16.5mm cup length (plastic)
11mm plunge, shaft bottoms out at 8mm
5mm dia. shaft, 25.5mm length with 0.5mm bearing shoulder

Rear outer cup:
46mm OAL
16.5mm cup length (plastic)
11mm plunge, shaft bottoms at 8mm
5mm dia. shaft, 29.5mm length with 0.5mm bearing shoulder

TT02 shafts are identical. The inner cups are open slots like the outers but functionally they are compatible. Really inexpensive to buy.

https://www.ebay.ca/itm/Tamiya-Drive...6/141780753981

If you need anything else just let me know.
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Old 01-31-2019, 08:47 PM   #54
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Thats very helpful! what are the OD of the cups?
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Old 01-31-2019, 11:55 PM   #55
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Quote:
Originally Posted by jonnywachter View Post
Thats very helpful! what are the OD of the cups?
16mm
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Old 02-01-2019, 12:51 AM   #56
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

So I got a lot done tonight. Designed a rough main subframe, upper arms, and upper shock towers. At first, the top arms were too short and limited the travel to about 25mm, I lengthened the arms and ended up with 33.7mm of travel. The upper ball joints are binding as you can see so the travel will be less unless I can figure out how to fix that.





here's some more picture of the rest of the chassis, still a lot to do! I put in 6 hours alone tonight and were not even close.





bottom side


top side


right side


You can see the shock has plenty of room.




Next big phase is the steering which I'm not looking forward to

Last edited by jonnywachter; 02-01-2019 at 11:07 AM.
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Old 02-01-2019, 01:29 AM   #57
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

This looks so cool!! I'm very impressed with your cad work!! I wouldn't even know where to start!! I do like my crawler but I only really got it as I like the scale truck thing!! This would look awesome!!

Sent from my ONEPLUS A6003 using Tapatalk
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Old 02-01-2019, 10:05 AM   #58
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Do you think you're going to have to relieve the lower arm near the inner pivots so the U-joint/cvd/dogbone cup doesn't hit it at full bump.Having similiar issues full lock on the steering at the wheels at full droop. Have you considered running different offset wheels or hubs so you can widen the components yet keep the same track width so you have more room to get all that stuff in there, reducing all the working angles? Sucks trying to utilize off the shelf stuff into a custom application, especially when you can't hold it in your hand. Amazing work going on here, definitely matches the subtitle of your thread. GCM made axle housings years ago that the pumpkin housing and axle tubes were separate pieces, all aluminum. Axle tubes mounted into the the pumpkin housing. That would have been perfect for your build and they sold parts separately back in the day. Not sure if they still work with the public like that now or even make or sell the pieces anymore, but may be worth looking into, something you wouldn't have to invent! They used an Axial gearset.
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Old 02-01-2019, 11:00 AM   #59
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

That will definitely have to be considered once I get the axles I want to use. Everything will be properly clearance to function correctly. I have been trying to use mostly axial parts but it seems this would benefit more from different rod ends, I found some cheap aluminum ones that look like I'll get more angle out of them, ill have to test both options. I understand what you're saying, by making the track width wider and I'm very against that. I want it to be 190mm hex to hex so that you can use the same parts and wheels as the rear end and so forth. I also think it will take away from the scale factor if it has to be so much wider. The end goal of this is to build something as scale as possible and to hopefully perform at least close to what the stock straight axles offered.

Last edited by jonnywachter; 02-20-2019 at 09:07 AM.
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Old 02-01-2019, 10:23 PM   #60
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Default Re: 1st gen Durango IFS TRUE SCALE (you're going to want to see this)

Beefed up the front shock towers and added a top brace to the sub frame for the diff. Need to do the steering but I can figure out how I want to do it, there's not much space.

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