GR Yaris I Broke my third Transmission at track 。this time GRMN close gear set

Sekred

Dedicated member
Dec 18, 2021
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Have not see you around for a while now. Did you fix your engine yet?.
 

Diyman25

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Jan 7, 2023
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Have not see you around for a while now. Did you fix your engine yet?.
I don’t really track my GR Yaris at summer
Busy tracking with my other car
 

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azet

Absorbed member
Mar 15, 2022
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@Diyman25 hi, even if not tracking your GR Yaris through summer, how many track hours have you done already on it since installing the Cusco hubs?
Reason I am asking: I am getting more and more issues shifting from 2nd to 3rd under hard acceleration. coming home from a track day where it did get worse and backing up to my garage I heard concerning noises coming from the drive train and a strange binding from the front diff. my bet is I will find some damage on gearhubs and the gearbox overall :-/
 
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Diyman25

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Jan 7, 2023
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@Diyman25 hi, even if not tracking your GR Yaris through summer, how many track hours have you done already on it since installing the Cusco hubs?
Reason I am asking: I am getting more and more issues shifting from 2nd to 3rd under hard acceleration. coming home from a track day where it did get worse and backing up to my garage I heard concerning noises coming from the drive train and a strange binding from the front diff. my bet is I will find some damage on gearhubs and the gearbox overall :-/
What is ur set up
Tire size , power wise (TQ)
 

Diyman25

Obsessed member
Jan 7, 2023
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On 2-3 difficult gear up shift
Is usually not the issue I have in this thread
More like drive error

On my experience Gr Yaris Syncro could. Be fragile and not helping when Toyota put a plastic shift pad in shift fork
 

azet

Absorbed member
Mar 15, 2022
39
77
18
On 2-3 difficult gear up shift
Is usually not the issue I have in this thread
More like drive error

On my experience Gr Yaris Syncro could. Be fragile and not helping when Toyota put a plastic shift pad in shift fork
it happens only on 2nd to 3rd, under load. maybe 1 of 5 shifts. sometimes I can reproduce, sometimes not.
end of last year I was coming home from a track day with a buddy of mine, same car, stock power. he got similar noises coming from gearbox and front diff as I have now. after few kms he got stuck with a completely locked drive train. result: 2nd shattered, torsen to pieces:
081889c3-f22b-48ef-bc33-f5497a52ee3f.jpeg

I will see what awaits me, in case the transmission dies on me, I will try to rebuild with the cusco hubs.
 

Diyman25

Obsessed member
Jan 7, 2023
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it happens only on 2nd to 3rd, under load. maybe 1 of 5 shifts. sometimes I can reproduce, sometimes not.
end of last year I was coming home from a track day with a buddy of mine, same car, stock power. he got similar noises coming from gearbox and front diff as I have now. after few kms he got stuck with a completely locked drive train. result: 2nd shattered, torsen to pieces:
View attachment 30478
I will see what awaits me, in case the transmission dies on me, I will try to rebuild with the cusco hubs.
That is some nasty failure on that lsd
 

Diyman25

Obsessed member
Jan 7, 2023
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To any one still follow the thread
Some thing update , in order to be fastest time attack machine in Taiwan
Choose some thing more suitable for track is need it
This time attack season I will move to 7speed Seq

Hope this thread will help whoever have transmission issue on their track Gr Yaris


Stay tune for more news on my time attack Gr Yaris
 

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Diyman25

Obsessed member
Jan 7, 2023
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Friend’s Gr Yaris car have same set of GCG28R like I do and push over 370whp and 45KG of TQ and 295/35/15 CRS with Cusco hub
Friend accidentally shit to 5th and stuck there , I tell them need to wait car to cool down , luckily car still have stock gear ratio
So car can finish circuit with 3-4 have decent improvement with new turbo

Car will be back with rebuild transmission and stock dual mass flywheel with upgrade pressure plate

U guys can see my opel speedster there
 

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