GR Yaris Hello there

[Onehp]

@Onehp @Sekred as per Michael's request I have tidied up this thread.

Can clean the previous page too, here is a redirect to sekred's tree hugger comment for on that topic discussion (can't edit my reply): https://www.gr-zoo.com/threads/opinion-original-exhaust-and-opf.169/post-133185

Thanks!

 

[Michael Knight]

Have been cleaning up the premises (garage) and now it starts to look like a decent place to do stuff.
Built jig for Audi A2 catalysator project yesterday.

Have been dialing up setup with GR and now it starts to be on region - fun to see how she goes on track! hopefully will get testing time soon.

Ordered a set of RP-1 pads as fronts looked wornish - they could last 1-2 sets but 3 is tough ask so good to have one set as reserve. it will be less aggressive than RP-x but I feel should still to the trick + less hard for the brake discs.

Should install the towing mounts front and rear, and spesific tricks to use to remove the tow hook plastics tidy?
I will not drill any holes, just remove the covers and put them back on if needed.

 

[Michael Knight]

Few practice runs at track yesterday. It was snowing so temps were not that great but considering weather and first session for the year got to 0.7s away from last years PB so ok session in that regard.
Had issues with powersteering even with regular battery, so my hypotesis that Lifepo couldn't deliver enough power was wrong - same issue with stock battery.
heavy steering was easily identifiable in trail in braking, but also in pit after session (fast turn steering wheel stationary). either power delivery to power steering is not sufficient, or then steering assistance motor is not performing as it should. Annoying bug!

 

[Altocumulus]

Few practice runs at track yesterday. It was snowing so temps were not that great but considering weather and first session for the year got to 0.7s away from last years PB so ok session in that regard.
Had issues with powersteering even with regular battery, so my hypotesis that Lifepo couldn't deliver enough power was wrong - same issue with stock battery.
heavy steering was easily identifiable in trail in braking, but also in pit after session (fast turn steering wheel stationary). either power delivery to power steering is not sufficient, or then steering assistance motor is not performing as it should. Annoying bug!

I've experienced sudden heavy steering feel on the track, usually when the car is near - or starts entering - a slide at speed. It's an intrusive, unusually heavy steering feel.

I had traction control turned on (standard setting) when I felt it , I did wonder if it was just some intrusive safety setting. I've not come across it when I've had traction control on expert setting, however that was at slower tracks where I never really got into high speed slides.

 

[Michael Knight]

Steering is not related to traction control. It occurs usually during simultaneous weight transition to front and turning, usually in trail braking.

 

[tonic]

If you could hook up TechStream, there are actually a few interesting EPS parameters you can log. Or I could figure out the OBDII PIDs and you could log them with a Torque app.

Figuring out exactly why it's happening, whether it's a voltage drop, the system limiting the current, or it's just getting too hot, will give a better idea of what's going on and if there's a potential workaround.

If you do end up grabbing some data, the helpful things to look at would be:
Battery Voltage: to see if it's dropping off significantly under load.
Command Value Current (Q Axis): how much steering assist the EPS wants to provide.
Final Motor Current Limited (Q Axis): the actual assist you're getting after the system's internal limits and logic kick in.
Thermistor Temperature: to check if the system isn't overheating.

Even if you pull only historic and not live data, there are some values showing what was happening.

Realistically, this might not be something you can 100% fix on the current setup, especially since Toyota specifically upgraded the EPS for the Type 26 models. But it would still be really interesting to see exactly what the bottleneck is.

 

[Michael Knight]

If you could hook up TechStream, there are actually a few interesting EPS parameters you can log. Or I could figure out the OBDII PIDs and you could log them with a Torque app.

Figuring out exactly why it's happening, whether it's a voltage drop, the system limiting the current, or it's just getting too hot, will give a better idea of what's going on and if there's a potential workaround.

If you do end up grabbing some data, the helpful things to look at would be:
Battery Voltage: to see if it's dropping off significantly under load.
Command Value Current (Q Axis): how much steering assist the EPS wants to provide.
Final Motor Current Limited (Q Axis): the actual assist you're getting after the system's internal limits and logic kick in.
Thermistor Temperature: to check if the system isn't overheating.

Even if you pull only historic and not live data, there are some values showing what was happening.

Realistically, this might not be something you can 100% fix on the current setup, especially since Toyota specifically upgraded the EPS for the Type 26 models. But it would still be really interesting to see exactly what the bottleneck is.

Cheers I actually have techstream - should just learn how to use it. But this was good intel to analyse the issue.