GR Yaris Gravel suspension magic / components for GR Yaris

TTomas said:
Here in Czech we have a small, but great company called protlum. They have made a top spec rally suspension for my friend, but they can make lower spec on request. The Top Race ARV ( low speed compression, high speed compression, rebound, Active Rebound Valve for maximum traction and safe landings, Thermal valve for long stages, hydraulic bump for compresion and extension) is around 5k, but they start from around 3k. Works great!
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Would Protlum be able to make something inbetween gravel and tarmac for the orignal GR yaris 50/50 tarmac/gravel intention, maybe 20mm raise (the one in pic looks like 40mm?) in height just to get some additional bump stroke, still maximum droop (=long stroke) as allowed by the standard suspension and all the tech? Spring rates close to stock?
 
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Onehp said:
Would Protlum be able to make something inbetween gravel and tarmac for the orignal GR yaris 50/50 tarmac/gravel intention, maybe 20mm raise (the one in pic looks like 40mm?) in height just to get some additional bump stroke, still maximum droop (=long stroke) as allowed by the standard suspension and all the tech? Spring rates close to stock?
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My purchase is still at least one year away but maybe more like this idea - as in interested to purchase? Like this post if you are so we get a count...
 
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Onehp said:
Would Protlum be able to make something inbetween gravel and tarmac for the orignal GR yaris 50/50 tarmac/gravel intention, maybe 20mm raise (the one in pic looks like 40mm?) in height just to get some additional bump stroke, still maximum droop (=long stroke) as allowed by the standard suspension and all the tech? Spring rates close to stock?
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Yes, of course.
 
Onehp said:
Is the rear damper coilover, with the spring over the damper? If so need to figure out how to reinforce the rear suspension turret.
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Weirdly enough, it’s apparently not needed… Source: Saito-san.
 
MRA3 said:
Weirdly enough, it’s apparently not needed… Source: Saito-san.
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Early on I already saw Morizo in an GRY used for rally with coilover rear that was reinforced. In theory upper damper mount will take already forces much higher then verhicle weight, but still you're adding the corner weight from the spring in addition so... Daigo Saito is rallying also?
 
On my MCA's it's not coilover in the rear, just the same as std = spring in the same place as original and same for the shock ...w/ very high springrates, and I love it that way. No inspired driving on gravel for me :LOL:
 
Protlum doesn’t have so much on the website but there is quite some GRY content on their facebook https://www.facebook.com/profile.php?id=100063576632995

I took the freedom to mash it in a little yt vid


@TTomas you know of any more footage of cars running this suspension in action? Would love to see the behaviour on bumps/jumps...
 
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Onehp said:
Protlum doesn’t have so much on the website but there is quite some GRY content on their facebook https://www.facebook.com/profile.php?id=100063576632995

I took the freedom to mash it in a little yt vid


@TTomas you know of any more footage of cars running this suspension in action? Would love to see the behaviour on bumps/jumps...
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Will ask for some action videos. But it works 100% and no problem if any needs for adjustment. This is video from adjustment test on Škoda 130lr group b car. The dampers are more simple - lower specs and the car as well.

 
TTomas said:
Will ask for some action videos. But it works 100% and no problem if any needs for adjustment.
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Sure it works, just want to see what I can expect in performance on a otherwise "normal" street GR Yaris. And just because I would love to see nice GRY in general :)

I also finally scrolled down enough in FB to find this text and image with some more information (didn't manage to find a direct link), I like it, without you @TTomas I would have never know it existed... published 14 July 2022:

"Available now - the highest version of our suspension, Top Race ARV sets for popular Toyota Yaris GR. This set is prepared to fit serial mounting points and use maximal possible strokes of the axles. This version is equipped by active rebound valve on all 4 shock absorbers, hydraulic stops (compression and rebound) and thermovalve. Delivered with all unibal top mounts, springs and damping setup for rally use. Of course adjustable camber on front strut."


294004908_5537365149627532_7436069058745326481_n.jpg


Edit: @Michael Knight to add to coilover list elsewhere? Unfortunately forum doesn't allow edits...
 
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TTomas said:
Will try to get some videos for you. Here is a video from Poland. I have Ohlins for street. If I would be doing more gravel or rally protlum would take my money.

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Thanks. Seems this car wasn't set up very well though especially the rear damping was out. Looking forward to more if you can find....
 
Onehp said:
Sure it works, just want to see what I can expect in performance on a otherwise "normal" street GR Yaris. And just because I would love to see nice GRY in general :)

I also finally scrolled down enough in FB to find this text and image with some more information (didn't manage to find a direct link), I like it, without you @TTomas I would have never know it existed... published 14 July 2022:

"Available now - the highest version of our suspension, Top Race ARV sets for popular Toyota Yaris GR. This set is prepared to fit serial mounting points and use maximal possible strokes of the axles. This version is equipped by active rebound valve on all 4 shock absorbers, hydraulic stops (compression and rebound) and thermovalve. Delivered with all unibal top mounts, springs and damping setup for rally use. Of course adjustable camber on front strut."


View attachment 24472

Edit: @Michael Knight to add to coilover list elsewhere? Unfortunately forum doesn't allow edits...
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hi cannot edit the table but added it has a post in another thread

GR Yaris - Coilovers

For those who would like to see how the basic H&R look like. No slotted hole for camber adjustment like they sometimes do for other car brands. No damping adjustement of course, and not as stiff as we might initially think given the numbers in the chart above. A good compromise for someone who...
www.gr-zoo.com www.gr-zoo.com
 
Onehp said:
Thanks. Seems this car wasn't set up very well though especially the rear damping was out. Looking forward to more if you can find....
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Yes, the set up is off…

My friends Karel Maceks car should be set up well. This is his 50th race season so not the wild young gun he use to be anymore, but great man mechanic and engineer. X-shift sequential for GRY is his work!



 
TTomas said:
Yes, the set up is off…

My friends Karel Maceks car should be set up well. This is his 50th race season so not the wild young gun he use to be anymore, but great man mechanic and engineer. X-shift sequential for GRY is his work!



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Thanks for sharing. X-shift tested in the field!

His car is much more settled and what I was hoping to see. Did he change anything to the spring rates or the arb?
 
just checked the stock suspension stiffness, found it on another forum

RZ HP RZ
Tyres Michelin PS4S Dunlop Sport Maxx
Wheels BBS Enkei
LSD Yes No
Front suspension:
Spring rate 36N/mm 34N/mm
ARB diam 24.2mm 23.2mm
Damper rates 1610N/890N 1550N/880N
(compression/rebound)
Rear suspension:
Spring rate 36N/mm 36N/mm
Rear ARB diam 21mm 21mm
Damper rates 1440N/890N 1130/870
(compression/rebound)
Upright stiffness? 2540Nm/degree 2360Nm/degree
Weight balance? 64%F 61%F
ESP program
 
Michael Knight said:
I find also Tractive coilovers interesting option as it can be adjusted on the fly and provides 5 preset map's for shock settings - perfect for versatile all road blasting with GR on asphalt and gravel.

View attachment 1792
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Hi, I know this is an old thread already, but has anybody tested this Tractive kit ?
I came across it by searching via different makers and found it quite interesting.

tractivesuspension.com

TracTive Suspension Touring Line | Stand-alone electronic suspension kit -

Discover more about the TracTive Suspension Touring Line | Stand-alone electronic suspension kit
tractivesuspension.com tractivesuspension.com
Popped them a mail, they answered the very next morning with the spring rates. They say they provide progressive spring rates
Front: 31-40 N/mm and Rear: 18-44 N/mm.
I find this kit very interesting for tarmac road use & abuse.
 
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