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

[Ecsrobin]

I’m genuinely curious how many well documented cases there actually are of bone stock GR Yaris engines letting go out of the tens of thousands out there, across both Gen 1 and Gen 2.

And out of those, how many were properly maintained, what oil they ran, and how often it was changed. That context is always missing, and without it we’re all just guessing. Probably something we’ll never fully know.

This is the problem I’m seeing now one really seems to be wanting to talk about the issues. I think i might be one of the first on the forum to mention a problem yet I know of at least 10+ cars (gen1) in the UK that have had the same issue.

 

[GottGry]

I’m genuinely curious how many well documented cases there actually are of bone stock GR Yaris engines letting go out of the tens of thousands out there, across both Gen 1 and Gen 2.

And out of those, how many were properly maintained, what oil they ran, and how often it was changed. That context is always missing, and without it we’re all just guessing. Probably something we’ll never fully know.

and how many times it's been over revved from misshifts

 

[Ecsrobin]

and how many times it's been over revved from misshifts

Mines an auto

 

[Wildcat]

The baffles in the oil pan are a good idea, but they probably weren't necessary in this driving situation! The engine must have failed for another reason.

 

[6mt]

This is the problem I’m seeing now one really seems to be wanting to talk about the issues. I think i might be one of the first on the forum to mention a problem yet I know of at least 10+ cars (gen1) in the UK that have had the same issue.

Yeah, I get why a lot of people stay quiet about an engine popping. It’s not exactly a fun thing to admit. So I’m genuinely glad you posted it. I’m the same way, if it happened to me I’d be all over this place posting updates and nonstop rants about it!

 

[Sterbo]

Yeah, I get why a lot of people stay quiet about an engine popping. It’s not exactly a fun thing to admit. So I’m genuinely glad you posted it. I’m the same way, if it happened to me I’d be all over this place posting updates and nonstop rants about it!

I think it's right and that it can help others too... if someone knows that the engine failure wasn't their fault, why hide it?

 

[boiNXTdoor]

15,000 miles Gen2 Auto and every bolt on probably possible other than turbo plus map around 350bhp. However I’m aware this has happened to stock cars so believe that I’ve possibly sped up the bang rather than causing it.

Sorry to hear that.

You got a Dyno sheet of your tune? How many NM did yours make and at what rpm?

 

[GTZ]

I think it's right and that it can help others too... if someone knows that the engine failure wasn't their fault, why hide it?

Because it's way harder to sell a car that everyone knows the engine blow. One thing IS for sure if I didn't touch anything, respect the maintenance and my car fail within a year or so... You can be sure that Toyota put me a new one or there will be fire and blood all over the place .

 

[MRA3]

Well that's very disappointing. Considering the damage to the TC and starter motor it sounds like another exploding piston.
What makes even worse is that it's a Gen 2 meaning this issue has not been addressed by Toyota.
I just find it Inexcusable that a company like Toyota with all their motorsport experience can't make fuking pistons.
Sorry for your pain.

Maybe the tuner can’t make fuking maps?

Blaming Toyota for changing the original map, with add ons, done somewhere, is beyond my understanding…

The car is great, and reliable on stock ecu and map. If someone maps their car is their gamble and should understand the risks and not blame the OEM, imo.

I still need to see an engine failure on a car with stock ecu and map, correct oil as per Toyota spec, and service intervals. And I know quite a few used hard with over 90k miles.

 

[Ecsrobin]

Maybe the tuner can’t make fuking maps?

Blaming Toyota for changing the original map, with add ons, done somewhere, is beyond my understanding…

The car is great, and reliable on stock ecu and map. If someone maps their car is their gamble and should understand the risks and not blame the OEM, imo.

I’m more than confident that the tuner is not to blame, as I said earlier it’s my belief I’ve sped up a process rather than cause it. My gen1 was up on power and no issues for more than double the miles this one achieved.

There’s 2- 3 well respected tuners in the UK and it’s one of them and the fact the cars back with them for the new engine should show my confidence in them. I am aware of stock cars having failed so it’s more of an issue than just blaming people who modify.

 

[Wildcat]

@Ecsrobin
I read your report about the tuning here in the forum: good hardware and a moderate increase in performance with reasonable horsepower and torque figures.

It all seems very logical and professional to me. The engine was running well below its load limit during normal driving when it failed. I also don't believe the software was the problem.

 

[TrueTurbo]

Maybe the tuner can’t make fuking maps?

Blaming Toyota for changing the original map, with add ons, done somewhere, is beyond my understanding…

The car is great, and reliable on stock ecu and map. If someone maps their car is their gamble and should understand the risks and not blame the OEM, imo.

I still need to see an engine failure on a car with stock ecu and map, correct oil as per Toyota spec, and service intervals. And I know quite a few used hard with over 90k miles.

There are multiple reports of Gen.1 stock engines and GR Corollas blowing up, this is most likely not related to the remap.

 

[MRA3]

I’m more than confident that the tuner is not to blame, as I said earlier it’s my belief I’ve sped up a process rather than cause it. My gen1 was up on power and no issues for more than double the miles this one achieved.

There’s 2- 3 well respected tuners in the UK and it’s one of them and the fact the cars back with them for the new engine should show my confidence in them. I am aware of stock cars having failed so it’s more of an issue than just blaming people who modify.

First of all, I’m sorry for this happening to you, and at the same time, hat off to you because you are openly discussing the topic in public. Most people do not.

The reality of mapping these cars is that is still not a very well known engine, and not all ecu tables have been enabled to be tuned properly with certain safety margins that the oem ecu and map do have. At least it was like that until a few months ago on ecutek.

Plus, being an auto, it is really uncharted territory especially if it was used as a development car. Furthermore, development cars should be owned by tuners themselves, so if something goes wrong is all on them not on the customer, but that’s me. The fact that after an engine is blown and they (the tuner) will still profit on making/fitting the new engines tells the story itself.

Materials have memory, in this case where the engine did not break on a high-load situation does not mean the culprit was not the map itself. If the engine has been working outside design temp ranges, cooling has been altered an so on, for a certain amount of miles, that will shorter the lifespan of said engine, and sooner rather than later it will pop.

I’m pretty sure that if the car would have been running the stock map, the engine would still last to this day, with the same use.

 

[speeddemon666]

Thought it worth an update.

My engine blew up.

Cruising along a dual carriageway approaching a motorway junction, car in front doing 60mph me matching their speed and when he pulled over I started accelerating 3-4,000rpm and it wouldn’t go past that. Ease off just try again and same and realise what’s going on.

However I’m over a flyover nowhere safe to stop so I kept the engine running and bang lots of white smoke a load of metal down the road and I found somewhere in not the safest spot and get recovered.

Engine has a hole in it identical to failures you’ll find over the internet including the Piras video, that a year ago I felt was BS. It’s also damaged the starter motor and transfer box.

The car got dropped off at the tuners and a new engine is going in along with a closed deck and forging to try and stop anything like that happening again, speaking to a friend at the weekend and their friends Gen1 is also at the same tuners getting a new engine for the same issue.

That's terrible news! So sorry that's happened to you.

 

[Ecsrobin]

I’m pretty sure that if the car would have been running the stock map, the engine would still last to this day, with the same use.

Happy to disagree here. If it hadn’t of happened on stock cars I’d completely agree however it is known to have happened on stock cars. My last engine tuned was fine for 4 years. This time not so much.

 

[speeddemon666]

I think initially you could be forgiven for thinking it is a tune, ECU or otherwise that might cause this, on doing a little research however (I am interested as I have the exact same model) it seems that this is a stock piston issue.

 

[cappo3]

I think initially you could be forgiven for thinking it is a tune, ECU or otherwise that might cause this, on doing a little research however (I am interested as I have the exact same model) it seems that this is a stock piston issue.

It appears therefore to be true that, be it a new coating or a whole new piston, Toyota did not solve this specific issue with the Gen2 revision of the engine.
Should this indeed be the case, it'd be on the sloppier spectrum of modern automotive decision-making, which is saying something. And not what I'd expect from Toyota, of all manufacturers.
I would be very curious to see what actually happened to @Ecsrobin's piston and compare that to piston damage occurred on Gen1 cars.

 

[Ecsrobin]

I would be very curious to see what actually happened to @Ecsrobin's piston and compare that to piston damage occurred on Gen1 cars.

I’m looking to compare in the new year.

 

[speeddemon666]

I think (such is mostly the case in economic considerations), if there were some gen 1 engines gathering in a warehouse somewhere, they might make their way to a gen 2.

 

[Wildcat]

The automotive industry meticulously replaces all modified parts when a model is changed. I myself work in quality management in the automotive industry. I believe the Japanese are even stricter in this regard than we Europeans!