Portal vs Straight Axles

[ScaleLifeNewbie]

on alot of runs ill.take a rig with 10.2 axles and 1.9 tires and a 2.2 on portals the 10.2 will go everywere my other rig with portals on 2.2s will go
i dont think it makes enuff of a diffence from a drivers perspective to worry about
run them and have fun

It’s really comes down to the driver IMO. yea, portals have a little bit more clearance, but while my Dad was running his TRX4, I was following in the 10.2 going everywhere he was, we both had on 1.9s. If you are a good driver a pick your lines right, you can go anywhere-portals or not.

Fwiw, I did the incline test using a piece of plywood with the TRX4 and the 10.2. The 10.2 went almost all the way to the top while the TRX4 kept flipping about half way up. (Unfortunately don’t know the incline)Ran the same G8 BFG Krawlers, the same battery, and no body to keep it fair. The TRX4 is significantly heavier and spread out weight while the 10.2 has most the weight up front. Maybe it’s the weight isn’t up front like the 10.2, maybe it’s the ‘higher cog’ portals that kept flipping the TRX4.




_________________
SCX10 ii
TRX4

 

[ScaleLifeNewbie]

The c hubs on my trx4 axles rigs are beat up from rocks bashing them constantly. Those rigs lives on 2.2s with narrower (.350) hubs as well so they aren't hanging out there in the breeze but tucked in reasonably.

I probably have a much different approach as I tend to use my inner sidewall to pull up on obstacles since I'm more of a comp driver than scaler. Capra axles are built with clearance in mind so they don't get hung up nearly as bad.

My C hubs are beat up too. The corners are rounded off lol.




_________________
SCX10 ii
TRX4

 

[furadi]

The c hubs on my trx4 axles rigs are beat up from rocks bashing them constantly. Those rigs lives on 2.2s with narrower (.350) hubs as well so they aren't hanging out there in the breeze but tucked in reasonably.

I probably have a much different approach as I tend to use my inner sidewall to pull up on obstacles since I'm more of a comp driver than scaler. Capra axles are built with clearance in mind so they don't get hung up nearly as bad.

Oh I hear ya... I hook my inner sidewalls quite a bit and I drag my c-hubs across everything but I guess my point is they've never gotten stuck. Mine are also still the stock plastic.

 

[furadi]

Got the rest of my upgrade parts for the Enduro build today.

+3 brass wheel hexes
IERC shock keys
IERC comp bumper

Already installed -

SSD knuckles and rear axle weights
Samix Ti high clearance links

(TRX4 has all the same upgrades more or less)

Truck weighs 5.5lbs vs 5.8lbs for my TRX4 sport. Both trucks are stripped of any unnecessary plastics to fit under the Creep body.
New benchmark for the Enduro on the traction board is 60 degrees vs 62 for the TRX4. Torque twist is what is holding it back. The FL wheel lifts and pulls it off the board. TRX4 doesn't have torque twist. Both trucks are maxing out at 47 degrees on the sidehill board. My end goal was to have these trucks performing equally in a controlled setting so my kid will have zero excuses when we hit the rocks.

I was a little worried when I built this thing last weekend and saw how top heavy it was but I'm pumped I got the CG mostly equal to my TRX4.

I actually went into this build thinking it would have superior sidehill capability due to the straight axles misconception. But it definitely doesn't and it definitely has much less ground clearance. They both have around the same ride height from the skid. 56 vs 58mm but the TRX4 has better link clearance cause they're mounted higher up and then obviously theres the axle clearance.

I'm not sharing this to bash the enduro but again at least in the case of these 2 trucks the idea that portals = high CG is a myth. There's zero downside that I can see to having the portals on the TRX.

 

[Phildirt]

You need a build thread in the Enduro section


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[furadi]

You need a build thread in the Enduro section


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Oh I will. Taking pics tomorrow of the final build weather permitting.

 

[Cyclist]

Not much to add to this thread really but I enjoy following it. I have both a TRX4 Sport and a SCX 10.2 . I was pretty surprised the other day when I measured the ground clearance at the skid on both of them. With a battery installed in there respective location, the measurement at the skid was identical. I really enjoy driving both the rigs, but find that the straight axles do get hung up significantly more on the jagged trails/rocks that I drive on.

 

[ferp420]

Got the rest of my upgrade parts for the Enduro build today.

+3 brass wheel hexes
IERC shock keys
IERC comp bumper

Already installed -

SSD knuckles and rear axle weights
Samix Ti high clearance links

(TRX4 has all the same upgrades more or less)

Truck weighs 5.5lbs vs 5.8lbs for my TRX4 sport. Both trucks are stripped of any unnecessary plastics to fit under the Creep body.
New benchmark for the Enduro on the traction board is 60 degrees vs 62 for the TRX4. Torque twist is what is holding it back. The FL wheel lifts and pulls it off the board. TRX4 doesn't have torque twist. Both trucks are maxing out at 47 degrees on the sidehill board. My end goal was to have these trucks performing equally in a controlled setting so my kid will have zero excuses when we hit the rocks.

I was a little worried when I built this thing last weekend and saw how top heavy it was but I'm pumped I got the CG mostly equal to my TRX4.

I actually went into this build thinking it would have superior sidehill capability due to the straight axles misconception. But it definitely doesn't and it definitely has much less ground clearance. They both have around the same ride height from the skid. 56 vs 58mm but the TRX4 has better link clearance cause they're mounted higher up and then obviously theres the axle clearance.

I'm not sharing this to bash the enduro but again at least in the case of these 2 trucks the idea that portals = high CG is a myth. There's zero downside that I can see to having the portals on the TRX.

just wondering if your enduro has the over drive gears cause they will make sidehilling alot harder

 

[furadi]

just wondering if your enduro has the over drive gears cause they will make sidehilling alot harder

Yep enduro has the 5% OD and my TRX4 has 11%. The Enduro has so much freakin steering it probably doesn't even need OD.

 

[furadi]

Not much to add to this thread really but I enjoy following it. I have both a TRX4 Sport and a SCX 10.2 . I was pretty surprised the other day when I measured the ground clearance at the skid on both of them. With a battery installed in there respective location, the measurement at the skid was identical. I really enjoy driving both the rigs, but find that the straight axles do get hung up significantly more on the jagged trails/rocks that I drive on.

Yep! My enduro is 56mm from the skid and my TRX is 58mm which can easily just be the difference in tires. When you start digging into it it's kinda crazy what Traxxas pulled off with the TRX4.

 

[furadi]

Got some nice weather today so we took the Enduro out to test all the upgrades. This folks is a prime example of torque twist. :mrgreen:

But even with that front wheel an inch of the rock is still made the sidehill! To my knowledge my Enduro is the only other rig to pull that line aside from my TRX4. At least with 4.75 tires. My buddy did it with a trailwalker once but that was with the little stock tires and even then I think both of his inside tires lifted off the rock.

 

[Phildirt]

Got some nice weather today so we took the Enduro out to test all the upgrades. This folks is a prime example of torque twist. :mrgreen:

But even with that front wheel an inch of the rock is still made the sidehill! To my knowledge my Enduro is the only other rig to pull that line aside from my TRX4. At least with 4.75 tires. My buddy did it with a trailwalker once but that was with the little stock tires and even then I think both of his inside tires lifted off the rock.

Have you thought about trying the pen spring mod on your Enduro shocks?


Sent from my iPad using Tapatalk

 

[MOguy]

It’s really comes down to the driver IMO. yea, portals have a little bit more clearance, but while my Dad was running his TRX4, I was following in the 10.2 going everywhere he was, we both had on 1.9s. If you are a good driver a pick your lines right, you can go anywhere-portals or not.

Fwiw, I did the incline test using a piece of plywood with the TRX4 and the 10.2. The 10.2 went almost all the way to the top while the TRX4 kept flipping about half way up. (Unfortunately don’t know the incline)Ran the same G8 BFG Krawlers, the same battery, and no body to keep it fair. The TRX4 is significantly heavier and spread out weight while the 10.2 has most the weight up front. Maybe it’s the weight isn’t up front like the 10.2, maybe it’s the ‘higher cog’ portals that kept flipping the TRX4.




_________________
SCX10 ii
TRX4

There are apps you can download on your smart phone that will tell you angles. Using them can help you get things better and better.

 

[MOguy]

Got some nice weather today so we took the Enduro out to test all the upgrades. This folks is a prime example of torque twist. :mrgreen:

But even with that front wheel an inch of the rock is still made the sidehill! To my knowledge my Enduro is the only other rig to pull that line aside from my TRX4. At least with 4.75 tires. My buddy did it with a trailwalker once but that was with the little stock tires and even then I think both of his inside tires lifted off the rock.

I have used shock keys mounted to the chassis so I can raise my rear upper suspension links to help with torque twist. Over drive helps, leaning your shocks forward helps. Rotating you pinion up more helps. The Enduro has a low pinon than makes torque twist worse but there are ways to deal with that.

 

[Phildirt]

I have used shock keys mounted to the chassis so I can raise my rear upper suspension links to help with torque twist. Over drive helps, leaning your shocks forward helps. Rotating you pinion up more helps. The Enduro has a low pinon than makes torque worse but there are ways to deal with that.

SSD Pro44 Axle swap ;-)

 

[MOguy]

SSD Pro44 Axle swap ;-)

YEP!!!!!, I am running the Axial one piece AR44 in my Enduro (Class1). I like them because they steer great (and I had a set laying around) but they are weak and I have broken them before and not sure how long theses will last. I have the diamonds in my Class2.

How are the pros compared to the diamonds?

 

[furadi]

Have you thought about trying the pen spring mod on your Enduro shocks?


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That's why I have the rubber bands. Same thing and I can adjust the resistance whenever.

 

[Phildirt]

YEP!!!!!, I am running the Axial one piece AR44 in my Enduro (Class1). I like them because they steer great (and I had a set laying around) but they are weak and I have broken them before and not sure how long theses will last. I have the diamonds in my Class2.

How are the pros compared to the diamonds?

No idea, have only run the pro's compared to AR44s and Enduros on this rig. The SSD axles are pretty heavy when you add the knuckles/c hubs/lockouts and what not. All of which help keep it planted.

 

[ferp420]

Yep enduro has the 5% OD and my TRX4 has 11%. The Enduro has so much freakin steering it probably doesn't even need OD.

thats probably not your problem then
from the looks of that picture your having torque twist issues not cog issues theres a thread on here somewere buy one of the comp guys were he figures out how to manipulate the link geomitry to eliminate torque twist or atleast make it work for him instead of against him the rear is easy a sway bar the front will take some effort

 

[furadi]

thats probably not your problem then

Oh there's no problem now per se. The Enduro is matching my TRX4 on sidehill angle.