GR Yaris (Gen 2) GR Yaris Mk2 (MY2024->)

JJT said:
Hi everyone,
I wanted to share an issue that several owners in Spain have noticed with the GR Yaris GR2. Under certain conditions, the turbo seems to get restricted and won’t go over 0.8–0.9 bar for a few seconds or even a couple of minutes.

The strange thing is:
  • No error messages appear.
  • Nothing is stored in the ECU.
  • The car “fixes itself” after a short while and boost returns to normal.
How to reproduce it:
  • With high outside temperatures and the car already hot after some spirited driving.
  • You stop for a few minutes (for example to refuel, 5–10 minutes).
  • When you start again, everything looks fine, but under hard acceleration the turbo doesn’t boost past 0.9 bar in any gear.
After some seconds or a minute or two, everything goes back to normal.

Has this happened to anyone else? Could you try it and see if you can replicate it on your GR2?
Later I will open a specific thread.
Click to expand...
You know what I thought: if you drive for a long time (even going normally), and you stop for 2 minutes, when you return you just turn on the ignition leaving the car off... you will notice that the temp is close to 100 sometimes more (I even saw 110 once).... because the sensor is output and reads higher temps when off... as soon as you start the car, the temp returns to normal 90-92, could it be that at that moment it reads that it is hot and takes a minute to check that everything is ok before giving power?
 
Interesting. Would it help to shield affected sensors to prevent the heatsoak? Or is that already a factor the RnD engineers kept in mind and added an offset?
 
Sterbo said:
Please explain to me so if it happens to me I already know... I use the translator and sometimes it's not clear... basically if the car is at the correct temperature (90-96 degrees) I stop, turn it off and start again after 5 minutes, the car even if it is at the optimal temperature, from when I start it in the first minute it doesn't go above 1 bar?
Click to expand...

Correct, that’s exactly what happens: when you restart the car while it’s hot, for a few seconds or even minutes the turbo doesn’t go beyond 0.9 bar, just like when starting it cold.
 
JJT said:
Correct, that’s exactly what happens: when you restart the car while it’s hot, for a few seconds or even minutes the turbo doesn’t go beyond 0.9 bar, just like when starting it cold.
Click to expand...
I haven't tried it when the car is cold 😥… I don't want to… but until when does the message to avoid hard acceleration come on?! I'm happy so if I leave it with someone they can't be too much of an idiot…

Juri-GR4 said:
Interesting. Would it help to shield affected sensors to prevent the heatsoak? Or is that already a factor the RnD engineers kept in mind and added an offset?
Click to expand...
What sensors do you use?
 
Sterbo said:
I haven't tried it when the car is cold 😥… I don't want to… but until when does the message to avoid hard acceleration come on?! I'm happy so if I leave it with someone they can't be too much of an idiot…


What sensors do you use?
Click to expand...
I wouldn’t think of pushing the car when it’s cold either, I was just mentioning it for comparison. Apparently, when you restart it hot, it behaves the same way as when it’s cold, but in this case no warning message shows up on the dashboard.
 
After digging through the service manual, I think putting these two together explains the situation:

iat_01.webp

iat_02.webp
 
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Technical question: Can't the entire MK1 exhaust be fitted to the MK2? Or are there parts that work? For example, a downpipe?
 
Sterbo said:
Technical question: Can't the entire MK1 exhaust be fitted to the MK2? Or are there parts that work? For example, a downpipe?
Click to expand...

It’s all different. Cat, GPF, Backbox. The diameter of the pipe is bigger and joins are in different locations and the tips are spaced out 2cm wider so you would have to use the old bumper if you managed to step down.
 
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tonic said:
Post #4176 of this thread ;)
Click to expand...

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Sam said:
£57.45 each here + shipping + duty + VAT

Bolts and clips are £1 each

www.amayama.com

Toyota 57627-52010 (5762752010) COVER, REAR FLOOR SIDE MEMBER, RH

Toyota 57627-52010 (5762752010) COVER, REAR FLOOR SIDE MEMBER, RH. New & genuine Japanese car parts. Fast shipping. Low prices. Request a quote from Amayama Trading Co. online.
www.amayama.com www.amayama.com

www.amayama.com

Toyota 57628-52050 (5762852050) COVER, REAR FLOOR SIDE MEMBER, LH

Toyota 57628-52050 (5762852050) COVER, REAR FLOOR SIDE MEMBER, LH. New & genuine Japanese car parts. Fast shipping. Low prices. Request a quote from Amayama Trading Co. online.
www.amayama.com www.amayama.com

www.amayama.com

Toyota 90109-06388 (9010906388) BOLT, NO.2

Toyota 90109-06388 (9010906388) BOLT, NO.2. New & genuine Japanese car parts. Fast shipping. Low prices. Request a quote from Amayama Trading Co. online.
www.amayama.com www.amayama.com

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Toyota 90467-07220 (9046707220) CLIP

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Click to expand...

679usd including shipping and tax 🥵
 
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