GR Yaris GR Yaris Achilles heel ( Transfer case )

[Diyman25]

GR Yaris is great compact sport car with mighty little 1.6 3yl
But being a Toyota, u know they will try to save some cost by using other production car part

I my self think one of worse design of any sports car is the weak drivetrain
No mater how much power u can put
If u can’t use it is point less

I said it very early GR Yaris transfer run hot
And so hot to a point I wonder why it ever pass the final QC check

Fastfoward today , my GR Yaris transfer case finally give up after 5 years of track only use !!! Beer in mind I change all my oil after each track day ,( this incl transfer case )

 

[SckSqzBngBlo]

Years of track only use on wide tyres seems pretty good.

 

[Sekred]

Lamspeed Racing 2020+ Toyota GR Yaris / Corolla 7075 Billet Transfer C

Details: Big sticky tyres and big launches? Whether it's on a tarmac rally stage, hill climb or at the drag strip we have seen that the weak point at this stage of development is the transfer case housing tends to twist and split leaving the guts of the transfer case on the ground. We have...

lamspeedracing.com

OEM Toyota Transfer Case Assembly - GR Yaris / Corolla 36100-52080

Details: Brand new OEM Toyota Transfer Case Assembly - GR Yaris / Corolla 36100-52080

lamspeedracing.com

 

[Diyman25]

Years of track only use on wide tyres seems pretty good.

That is with intense maintenance
It should give up long ago fellow by regular maintenance

 

[Juri-GR4]

irc performance might be worthwile to check: https://www.instagram.com/irc_performance/

Austria based but if you need assistance i can help from Germany.

 

[yan.ko]

Or from well-known sequential gearbox manufacturer X Shift Gearboxes - https://www.xshiftgearboxes.com/category/transfer-cases/toyota

 

[ZN8]

@Diyman25 how much power does your Yaris make?

 

[Diyman25]

@Diyman25 how much power does your Yaris make?

Very little just gcg28R at 2bar of boost
But is what I use my Gr Yaris in circuit with big wide tire

 

[sixtentouge]

@Diyman25 how much power does your Yaris make?

He stated over 500nm at the hubs.

 

[sixtentouge]

Way back in the early 2000s, I built an R32 GT-R that went 8.8" at 163MPH with a Holinger transmission. It shredded stock transmissions, as well as every aftermarket gear set I put in it, and it even broke the transfer case main shaft on the journey to get to that time. At no time did I ever badmouth Nissan for building a transmission that wasn't up to the task.

You've taken the part way, way past anything Toyota intended it to do. Way over the horsepower limits of any racing series the car was designed to be used in, a single mass flywheel with twin disc clutch, big power, using a 290 S tire...

99.99% of the people here in Japan who is using the car as intended...300hp and 400nm as a stage-rally or gymkhana car...is having transfer problems.

With the addition of an oil cooler, Toyota uses the transfer in endurance circuit racing without issue.

What you've done with the car is amazing, but not having a billet transfer in it (which they make for this reason) is on you

 

[MRA3]

Way back in the early 2000s, I built an R32 GT-R that went 8.8" at 163MPH with a Holinger transmission. It shredded stock transmissions, as well as every aftermarket gear set I put in it, and it even broke the transfer case main shaft on the journey to get to that time. At no time did I ever badmouth Nissan for building a transmission that wasn't up to the task.

You've taken the part way, way past anything Toyota intended it to do. Way over the horsepower limits of any racing series the car was designed to be used in, a single mass flywheel with twin disc clutch, big power, using a 290 S tire...

99.99% of the people here in Japan who is using the car as intended...300hp and 400nm as a stage-rally or gymkhana car...is having transfer problems.

With the addition of an oil cooler, Toyota uses the transfer in endurance circuit racing without issue.

What you've done with the car is amazing, but not having a billet transfer in it (which they make for this reason) is on you

Sorry, you mean 99,99% of the people in Japan who are using the car as intended with 300 hp and 400 nm ARE NOT having transfer problems? Or what you wrote is correct and they indeed are having issues?

Thanks.

Agreed on the OP not complying with the design brief of the transfer case itself, so is not really Toyota’s fault.

 

[Diyman25]

Way back in the early 2000s, I built an R32 GT-R that went 8.8" at 163MPH with a Holinger transmission. It shredded stock transmissions, as well as every aftermarket gear set I put in it, and it even broke the transfer case main shaft on the journey to get to that time. At no time did I ever badmouth Nissan for building a transmission that wasn't up to the task.

You've taken the part way, way past anything Toyota intended it to do. Way over the horsepower limits of any racing series the car was designed to be used in, a single mass flywheel with twin disc clutch, big power, using a 290 S tire...

99.99% of the people here in Japan who is using the car as intended...300hp and 400nm as a stage-rally or gymkhana car...is having transfer problems.

With the addition of an oil cooler, Toyota uses the transfer in endurance circuit racing without issue.

What you've done with the car is amazing, but not having a billet transfer in it (which they make for this reason) is on you

32/33/34 GTR and JZA80 Supra all have one of toughest transmission at that time
I agree I excited limit of GR Yaris drivetrain
But Toyota did not did a proper design like rest of car , they can aleast throw in design like Mitsubishi EVOLUTION

Any how I still like GR Yaris , but can’t stop complain it , after I go through 3 transmission and 2 transfer case

 

[Diyman25]

Check how hot transfer case will get after just 2 lap at track without cooler but with GRMN panel install
Over 170c and this is width GRMN under panel install

 

[Ecsrobin]

32/33/34 GTR and JZA80 Supra all have one of toughest transmission at that time
I agree I excited limit of GR Yaris drivetrain
But Toyota did not did a proper design like rest of car , they can aleast throw in design like Mitsubishi EVOLUTION

Any how I still like GR Yaris , but can’t stop complain it , after I go through 3 transmission and 2 transfer case

I look forward to buying the car you design

 

[speeddemon666]

I am finding these threads a bit bonkers!
I have a Transit Custom and loaded it with 5 ton of tools. The weak point of a Transit Custom is it's springs!

 

[Ecsrobin]

I am finding these threads a bit bonkers!
I have a Transit Custom and loaded it with 5 ton of tools. The weak point of a Transit Custom is it's springs!

Yep it’s like strapping a rocket to the back of the car and it blowing up. It’s not the rocket or the person who strapped the rocket to the cars fault it’s the car manufacturers

 

[Diyman25]

I look forward to buying the car you design

Yep it’s like strapping a rocket to the back of the car and it blowing up. It’s not the rocket or the person who strapped the rocket to the cars fault it’s the car manufacturers

I am finding these threads a bit bonkers!
I have a Transit Custom and loaded it with 5 ton of tools. The weak point of a Transit Custom is it's springs!

Guess none of u guys can really ur GR Yaris at track use

 

[ninjan00dles]

32/33/34 GTR and JZA80 Supra all have one of toughest transmission at that time
I agree I excited limit of GR Yaris drivetrain
But Toyota did not did a proper design like rest of car , they can aleast throw in design like Mitsubishi EVOLUTION

Any how I still like GR Yaris , but can’t stop complain it , after I go through 3 transmission and 2 transfer case

Back in the 90s the street cars (Evo/STI) could benefit from inheriting technology development from the race programs, but the AWD tech is completely divorced from the road going cars now. The WRC racecars just use something like Sadev or Xtrac for the AWD drivetrain. So the road cars end up with the parts binning (ITCC/Transfer Case/Transmission) we have now.

That being said - it seems that for most track users (road car) just cooling the transfer case is enough to keep it reliable. The TC GR Corolla which competes in the US uses the same transfer case as the road cars, it's just cooled.


Are you still on your original ITCC? That little unit seems to just keep going.

 

[TheManWithTheStick]

Thanks @Diyman25, I for one appreciate knowing about the failures you've found. Always good to hear when things are letting go and why!

170c does seem a bit hot and its a shame the GRMN undertray doesn't help.

It's also a shame some are getting personally offended that you've suggested their precious GRY isn't perfect. I hope this hasn't put you off making these sort of posts in future.

 

[Ecsrobin]

It's also a shame some are getting personally offended that you've suggested their precious GRY isn't perfect. I hope this hasn't put you off making these sort of posts in future.

We’re not offended that the GRY is not perfect. I could point out many flaws that we all probably share but to try and blame the manufacturer for flaws when used far outside its design is crazy.