Kronos XTR Horatio's XTR Build

[Nelson.81]

Erm, ok.

I spoke to Dave from Scorched parts.

The 8mm ball won't fit the Corally diff outs, which are 7.8mm and the Corally dog bones are 7.6mm - designed to be a clearance fit.

Dave stated that if the diff outs are 5mm shaft, his ones may work. So, basically take the diff apart and the Scorched diff outs, with an 8mm cup may work.

I also discussed the pins, thinking that if he supplied the driveshafts, I could possibly get them machined down to 7.6mm ball and then send them back to get the pins pressed in.

But, it looks like I need to go back to the drawing board with the driveshafts - or modify the diff. Or just replace the center diff entirely. There are still plenty of options, including upgrading the entire motor mount assembly.

Interestingly, the first thing Dave asked was - how much kick up are you running? "As soon as you start hitting some speed, you'll notice excessive wear on your front driveshaft. This is because of the kick up". To mitigate it on the Arrma cars - including the limitless - they recommended the Trident speed running shafts.

When I told him I was running 0° kick up, he said 'you'll be fine then - like with the Hobao' which also runs 0°, being an inherently on-road car, rather than an Inbetweener like the Arrmas.

Basically, with the limitless, if you want to go super fast like with a Hobao V2E - you need those Trident shaft and Pinocchio centre spool (224mph fast!!).

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Meanwhile, back at planet knobhead:

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546!! Crikey! It's not that far off the weight of my Baja 5B stock SS chassis - and 75g heavier than my current 5B chassis....!

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So, now it's time to swot up on diff outputs and see if any of the Scorched parts will fit our freaky Corally diffs.

I thought I was done looking at scorched titanium drive shafts, then I come across an old fb post where I see them fitted, I’ve messaged the fella see if can get some info but old post from 2020 but maybe they will fit

 

[Horatio]

I thought I was done looking at scorched titanium drive shafts, then I come across an old fb post where I see them fitted, I’ve messaged the fella see if can get some info but old post from 2020 but maybe they will fit

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Cheers buddy - these would be super nice!

 

[Nelson.81]

Cheers buddy - these would be super nice!

It was limitless shafts so he had so only fitted the rear, had to remove metal bar between rear shock tower to chassis braces to fit but apart from that straight fit just added little bit fuel line make up the difference in shaft length, 168mm v 170.5mm, says it transformed it. Don’t think it’ll be this month for me but I will be be ordering them to give them a try.

 

[Horatio]

It was limitless shafts so he had so only fitted the rear, had to remove metal bar between rear shock tower to chassis braces to fit but apart from that straight fit just added little bit fuel line make up the difference in shaft length, 168mm v 170.5mm, says it transformed it. Don’t think it’ll be this month for me but I will be be ordering them to give them a try.

Great advice, thank you.

 

[Horatio]

 

[Horatio]

370 grams is a fair description of the weight. My scales show 372.2 before balancing.

I'll weigh the others just to see if there's much variance.

So we're looking at a saving of about 70 grams per corner.

Having weighed all 4, 2 were 371, the one in the picture 372, the other was 373. These weights are pre- balancing.

Here we have the Jetkos - 436 grams after balancing. Or at least - 2 of them are. The other 2 were both 440 grams.

Weighing all the Jetkos:

To the nearest gram - 1762 grams of rotating mass.

Vs 1489. So a saving of 273 grams of rotating mass.

The Jetkos are 155mm x 80mm - they're big old tyres.

The Louise are 140mm x 80mm.

So, it's time to balance them all up, which I have to say is a really therapeutic way of finishing off my lunch hour.

 

[Horatio]

I've also looked at the impact on the rollout. On 17/46 gearing and 140mm tyres, the rollout is 49.15mm/rev, which on my 1780kv motor on 22.2v should give me 72.4mph.

 

[Nelson.81]

View attachment 7135
370 grams is a fair description of the weight. My scales show 372.2 before balancing.

I'll weigh the others just to see if there's much variance.

So we're looking at a saving of about 70 grams per corner.

Having weighed all 4, 2 were 371, the one in the picture 372, the other was 373. These weights are pre- balancing.

View attachment 7136
Here we have the Jetkos - 436 grams after balancing. Or at least - 2 of them are. The other 2 were both 440 grams.

Weighing all the Jetkos:

View attachment 7137
To the nearest gram - 1762 grams of rotating mass.

View attachment 7138
Vs 1489. So a saving of 273 grams of rotating mass.

View attachment 7139
The Jetkos are 155mm x 80mm - they're big old tyres.

The Louise are 140mm x 80mm.

So, it's time to balance them all up, which I have to say is a really therapeutic way of finishing off my lunch hour.

Jetkos look more round across the tread a little like a motor bike tire. Weight savings always a plus Louise & look more square flat across the tread makes them look slightly wider even if the same.

I've also looked at the impact on the rollout. On 17/46 gearing and 140mm tyres, the rollout is 49.15mm/rev, which on my 1780kv motor on 22.2v should give me 72.4mph.

I managed 63mph in my buggy with the 1780kv 18t/46 the tires 113mm I think. gensacearespammers 5500 60c

 

[Horatio]

Jetkos look more round across the tread a little like a motor bike tire. Weight savings always a plus Louise & look more square flat across the tread makes them look slightly wider even if the same.

The Louise tyres have a profile that's much more like the Sweeps.

Whilst the compound is described as 'soft' - they don't feel as sticky as the Jetkos. They're also covered in loads of releasing agent.

Pros:

• lighter,
• very round/well mounted/no wobble
• required only 3-5grams to balance
• no gap between the insert and the tyre

Cons

• MFT isn't belted as such - fibres are in the tyre
• Squarer edge have greater tendency to grip roll

I used the old faithful wheel balancer, XTR bicycle wheel balance weights (2.5grams), grey blue tac and balance.

The process I use is to use blue tac to find the required weight, then use the 2.5 gram weights where possible to attain the required counter balance.

One wheel used 2 XTR weights. The other three used 1 XTR weight and a small amount of blu tac to balance up perfectly.

These wheels balance up well. Nearly as good as the Sweeps!

They're nice looking, asymmetrical tyres which are not directional like the Jetkos.

I doubt the tread has much of a bearing here, but hopefully they work OK in the wet, seeing as Wales gets so much liquid sunshine.

 

[Nelson.81]

The Louise tyres have a profile that's much more like the Sweeps.

Whilst the compound is described as 'soft' - they don't feel as sticky as the Jetkos. They're also covered in loads of releasing agent.

Pros:

• lighter,
• very round/well mounted/no wobble
• required only 3-5egrams to balance
• no gap between the insert and the tyre

Cons

• MFT isn't belted as such - fibres are in the tyre
• Squarer edge have greater tendency to grip roll

View attachment 7141
I used the old faithful wheel balancer, XTR bicycle wheel balance weights (2.5grams), grey blue tac and balance.

The process I use is to use blue tac to find the required weight, then use the 2.5 gram weights where possible to attain the required counter balance.

One wheel used 2 XTR weights. The other three used 1 XTR weight and a small amount of blu tac to balance up perfectly.View attachment 7143
These wheels balance up well. Nearly as good as the Sweeps!
View attachment 7142
They're nice looking, asymmetrical tyres which are not directional like the Jetkos.

I doubt the tread has much of a bearing here, but hopefully they work OK in the wet, seeing as Wales gets so much liquid sunshine.

Look great

 

[Sandracer_NL]

The Louise tyres have a profile that's much more like the Sweeps.

Whilst the compound is described as 'soft' - they don't feel as sticky as the Jetkos. They're also covered in loads of releasing agent.

Pros:

• lighter,
• very round/well mounted/no wobble
• required only 3-5egrams to balance
• no gap between the insert and the tyre

Cons

• MFT isn't belted as such - fibres are in the tyre
• Squarer edge have greater tendency to grip roll

View attachment 7141
I used the old faithful wheel balancer, XTR bicycle wheel balance weights (2.5grams), grey blue tac and balance.

The process I use is to use blue tac to find the required weight, then use the 2.5 gram weights where possible to attain the required counter balance.

One wheel used 2 XTR weights. The other three used 1 XTR weight and a small amount of blu tac to balance up perfectly.View attachment 7143
These wheels balance up well. Nearly as good as the Sweeps!
View attachment 7142
They're nice looking, asymmetrical tyres which are not directional like the Jetkos.

I doubt the tread has much of a bearing here, but hopefully they work OK in the wet, seeing as Wales gets so much liquid sunshine.

I like the look of those.
Good to hear there were balanced OK out of the box, I mean bag.
Hopefully weather clears up soon so you can run them!

 

[Horatio]

@Nelson.81 - 63mph on buggy wheels is flying! Fair play.

 

[Nelson.81]

Cheers buddy - these would be super nice!

I can confirm they fit the drive cups, getting them to fit in the chassis another story

 

[Horatio]

I can confirm they fit the drive cups, getting them to fit in the chassis another story

View attachment 7157

This is good to know!

 

[Horatio]

The 168mm limitless is available as a single item.

https://scorchedparts.co.uk/product...shaft-single-rear-infraction-limitless-felony

The issue that concerns me is that it's specified as having 8mm ball ends - this is 0.2mm wider than Corally cup sizes.

@Nelson.81 Do you have eyes on that the ends of the current spec Scorched Parts driveshafts fit Corally cups?

 

[Nelson.81]

The 168mm limitless is available as a single item.

https://scorchedparts.co.uk/product...shaft-single-rear-infraction-limitless-felony

The issue that concerns me is that it's specified as having 8mm ball ends - this is 0.2mm wider than Corally cup sizes.

@Nelson.81 Do you have eyes on that the ends of the current spec Scorched Parts driveshafts fit Corally cups?

Those are my shafts delivered yesterday, o ordered single shafts 168 & 85 just come packed together, they fit cups but thickness of the shaft I couldn’t get them to drop in from above with diff just can’t get the angle to get either in. I was in work last night no photos taken, the rear I may have to shave a little off the metal Center brace , the front not sure will work the thickness of the shaft 7mm with the kick up at front and angle shaft comes out can’t get angle to get it into Center diff cup catches brace, I going to try removing motor & diff mount see if they slide in from the side but still concerned front shaft to thick with angle & kick up will catch or rub. To tired going to bed, I’ll look at it again later if get time post pics. I think in your chassis with driveline inline & less kick you’ll have no issues.

 

[Horatio]

Fitted the Kagama front upper arms. Whilst they fit perfectly, I found that toe and camber required adjustment afterwards.

The Kagama arms are a really nice upgrade and can be fitted with carbon inserts - if you can find them. Mine are on back order.

The arms are slightly longer, which means my 2° negative camber is now 1° negative. Future Horatio will adjust the bottom pivot balls to get the geometry back where it seems to work best.

Bizarrely, the new arms also gave me slightly more toe out. Not sure how.

 

[Nelson.81]

Fitted the Kagama front upper arms. Whilst they fit perfectly, I found that toe and camber required adjustment afterwards. View attachment 7177View attachment 7178

I expect the graphite inserts won’t be be too long before they’re added also. Would you like to try a titanium driveshaft . As I feared the front scorched shaft is to thick with angle & kick up it catches drive cup was tight as a mofo to get it in and when I did it did rotate but no movement back or fwd in cup, so going to have to get a tworks shaft for the front same as my buggy 6mm is just too thick would need be 3-4mm max. The rear fits going to need to modify rear brace. With your drive line being straight and not as much kick maybe front shaft will work in your chassis if want to try it as it not much use to me now.

 

[Horatio]

I expect the graphite inserts won’t be be too long before they’re added also. Would you like to try a titanium driveshaft . As I feared the front scorched shaft is to thick with angle & kick up it catches drive cup was tight as a mofo to get it in and when I did it did rotate but no movement back or fwd in cup, so going to have to get a tworks shaft for the front same as my buggy 6mm is just too thick would need be 3-4mm max. The rear fits going to need to modify rear brace. With your drive line being straight and not as much kick maybe front shaft will work in your chassis if want to try it as it not much use to me now.

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Such a kind and generous offer. Thank you! I'll PM you.

My chassis does not have kick or all the central bracing, so you never know - the front driveshaft could work.

I'm going to order the rear driveshaft soon.

Could you measure the length between the pins on the front driveshaft, please?

Otherwise, ready for the next speed run.

In other news, I'm waiting for this to arrive:

And I'm booked in for a whole day at NAM studios near Bath, England for a recording session. This is the very same studio that recorded Royal Blood and KT Tunstall!!

By the end of it, we should have the bones of an EP. December is going to be a busy month.

 

[Nelson.81]

Such a kind and generous offer. Thank you! I'll PM you.

My chassis does not have kick or all the central bracing, so you never know - the front driveshaft could work.

I'm going to order the rear driveshaft soon.

Could you measure the length between the pins on the front driveshaft, please?

View attachment 7190
Otherwise, ready for the next speed run.

In other news, I'm waiting for this to arrive:

View attachment 7191
And I'm booked in for a whole day at NAM studios near Bath, England for a recording session. This is the very same studio that recorded Royal Blood and KT Tunstall!!

By the end of it, we should have the bones of an EP. December is going to be a busy month.

Sry I only just saw this post, was flat out out all day yesterday out watching LFC beat Chelsea & picking parents up in the evening by time I got home last night was busted & didn’t measure the shaft before giving it to my postman but going by scorched measurements it’s the 85mm shaft should be 85mm pin 2pin picture best I can do side by side with original.