Crawler Upgrade, FTX HI ROCK + INJORA TRX PORTAL AXELS

[Fabia130vRS 2098]

SO...

 

after a year that I own the FTX now, I did upgrade a few things like...

1. ARC Servo 14kg 0.04msec (super fast and precise)

2.Metal drive shafts 3x

3. Ebay Deep dish wheels Metal

4. Louise CR Rowdy tires 1.9 45mm wide 121mm height

5. Trail lights under the chassis

6. Harder front springs

7. 45gr weights on the tail

8. Aluminium Sway bar upper mount

Here you can see the difference in front and rear springs, more weight in the front did call for harder springs, managed to find some of a nitro buggy that fit.

 

 I run it on 3s, with my buddy who owns a TRX, I can say, surprisingly with wider tires, the FTX is unstoppable, it is not heavy like the TRX and climbs easily over everything, not very realistically but with ease.

 

Now I decided to upgrade to portal axels, I opted for the most advanced but also cheapest option, thanks to ALI Express, I managed to snag a Injora Portal Axel set for 49€ including shipping. (they are rebranded to some 'Austarhobby' brand, but are identical, also advertised as 'Metal front and rear portal axel set' )

 

That's a bargain compared to the cheapest on ebay to be around 65€

 

 

They are a direct clone of the TRX axels, it can lock the diffs, if I don't use the cable they will remain unlocked, making it unable to crawl.

 

I will need to install two micro servos into a Y lead and use the auxiliary port on the RX to operate them.

 

Can't wait to get my hand on the and see if the fit easily, I already know there might be a issue with the drive shaft connection hole.

I don't know how it will affect speed, as the differential gear ratios are the same as on the TRX. 

 

Any thoughts and experience with these axels?  I heard different stories about their quality...

If this works out, I would switch to 2.2 wheels, they might fit with portal axels. But first I need the two micro servos, get them working and proceed.

[Badcrumble 4418]

I too have heard of poor quality but have no direct experience. I have some regular Injora axles but haven't used them yet.

I would suggest stripping them down, inspecting the gears for burrs, etc and then re-assembling with high quality waterproof grease of your choice.

Hope all works well!

[Fabia130vRS 2098]

17 minutes ago, Badcrumble said:

I too have heard of poor quality but have direct experience. I have some regular Injora axles but haven't used them yet.

I would suggest stripping them down, inspecting the gears for burrs, etc and then re-assembling with high quality waterproof grease of your choice.

Hope all works well!

Definitely, thank you for the heads up.

 

[Fabia130vRS 2098]

...

[Shergar 141]

Nice little review. Word of warning, I have a truck with an SCX10 transmission and TRX4 axles, you get twice the gear reduction so it will be R E A L L Y   S L O W ! Its also really noisy! You might need to play around with transmission gearing. Another source for genuine TRX4 axles is Jenny’s. Ive had plenty of parts shipped no problems. https://jennysrc.com

 

[Fabia130vRS 2098]

8 hours ago, Shergar said:

Nice little review. Word of warning, I have a truck with an SCX10 transmission and TRX4 axles, you get twice the gear reduction so it will be R E A L L Y   S L O W ! Its also really noisy! You might need to play around with transmission gearing. Another source for genuine TRX4 axles is Jenny’s. Ive had plenty of parts shipped no problems. https://jennysrc.com

 

Thank you for the warning.

Well... I am already now worried about the outcome.

Last night I posted,, about ordering 2 Mini Servos with mounts, just later to edit the reply above and delete it, cancel the servos and mounts...

why? here...

The axels most likely will be delivered, as REPLECEMENT for TRX4 axels, there will be no locking mechanism in the differential axel.

I will get front and rear axels with differential open, no way to lock it. So I will take apart both and try to do something about it... most probably add the diff stopers from my diff to this one I will get.

 

 

@Shergar,  the TRX replacement diffs come with a diff ratio (including portal gears) of 5.59, while the FTX has 2.66 

the FTX overall has a gear ratio FDR 54 : 1, now it would skyrocket to 56,93 : 1 FDR.

While the TRX has two speeds, FDR is for 1st gear: 64.64:1, 2nd gear: 25.85:1

This difference may be great, we will see. It is slow and loud already 

 

Edit: at some point I want to put a brushless crawler combo in it, higher FDR might be a good thing.

Even If I could use my crown gear and drive gear pinion, with the portal axel ration I would still end up at a FDR of 56.55