GR Yaris Hello there

did few run in brakings with new discs and must admin the stopping power is back to impressive level. Completely on different level compared to old discs.
cannot wait to get back to track..!
 
Michael Knight said:
did few run in brakings with new discs and must admin the stopping power is back to impressive level. Completely on different level compared to old discs.
cannot wait to get back to track..!
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What pads are you using with the Alcons? How much did you pick up the discs for? I will prob get a set of Alcon discs when the time comes.
 
Euge said:
What pads are you using with the Alcons? How much did you pick up the discs for? I will prob get a set of Alcon discs when the time comes.
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it was 649€ per disc via Sarlin Racing. I'm still using RP-X. 2nd set in use, maybe 3/4 so should be good for this summer.
 
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Went for evening cruise with our middle one around local city roads - surprisingly quiet as usually you see many sports car but spotted only one older Mustang. Well, weather wasn't that good either. With Valinos, car spins four wheels when accelerating on 2nd gear on wet asphalt so need to be concentrated but lots of fun opportunities available.
Maybe need to visit track more often when wet, just to practice car handling and drifts vs. lap times. after all, its at least as fun as pushing hard.
 
Michael Knight said:
did few run in brakings with new discs and must admin the stopping power is back to impressive level. Completely on different level compared to old discs.
cannot wait to get back to track..!
Click to expand...

Good to have feedback on Alcons, as I'm considering these or Girodiscs and need to decide if the price difference is worth the higher Alcon price.

It doesn't help that I haven't got a comparison of their weight nor estimated longevity (ie, starting & worn thickness for each) to help decide based on data.

Aware of @Onehp leaning towards cheaper ones but this hasn't lured me into that end of the spectrum. Perhaps not yet.

Onehp

GR Yaris Post in thread 'Time for new brakes'

I think most adtermarket disks are worn when they are down 1mm per side. The OEM are thick and iirc (needs to be fact checked) can take 1,5mm or 3mm total* = 50% more life. They are bit heavy and not as good cooling but just fine for road use then. And they get noticably lighter with use (congrats if you can notice that though ;) )

I would just get the cheapest if not running them seriously hard on track...

There is DBA also.

*28mm to 25mm?
  • Like
 
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Michael Knight said:
r. With Valinos, car spins four wheels when accelerating on 2nd gear on wet asphalt so need to be concentrated but lots of fun opportunities available.
Maybe need to visit track more often when wet, just to practice car handling and drifts vs. lap times. after all, its at least as fun as pushing hard.
Click to expand...
Just ordered a set of the Valinos in 215/45/17 as my Cup 2 will be over in about a month. Look forward to them!
 
Spirited said:
Good to have feedback on Alcons, as I'm considering these or Girodiscs and need to decide if the price difference is worth the higher Alcon price.

It doesn't help that I haven't got a comparison of their weight nor estimated longevity (ie, starting & worn thickness for each) to help decide based on data.

Aware of @Onehp leaning towards cheaper ones hasn't lured me into that end if the spectrum. Perhaps not yet.

Onehp

GR Yaris Post in thread 'Time for new brakes'

I think most adtermarket disks are worn when they are down 1mm per side. The OEM are thick and iirc (needs to be fact checked) can take 1,5mm or 3mm total* = 50% more life. They are bit heavy and not as good cooling but just fine for road use then. And they get noticably lighter with use (congrats if you can notice that though ;) )

I would just get the cheapest if not running them seriously hard on track...

There is DBA also.

*28mm to 25mm?
  • Like
Click to expand...
yeah.. I prefer weight and performance to longeivity. Can report how they discs last in my use.
I think they should do fine but there's seldom better performance with better durability, usually you can just pick one. But it gives more smiles for miles which is the deciding factor here.
 
Rear brakes were squaling a lot even after Toyota Service. So checked the situation and rear brakes needed some cleanup.
No full points for service guys here.. its 15-20min job per corner so not really a biggie if "you're there".

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went for short recreational walk with GR, and same time measured the underhood temps with Rally2 vents.
Temp sensor was located on top of airbox snorkel.

Ducts seem to work faily well from 50kmh onwards. In city they gave 2-3'C above ambient and on road it drops to 1-2'C.
City traffic had few stops. Ambient temps were btw 17-20'C during drive.

here are few temp measures from cold car (50% in city 50kmh, then later 50% on faster narrow road, 80kmh). And back vise versa.
The middle pic is how temps went when car was waiting for 1hr. Oils reached 95'C after first drive.

BTW with fresh discs the RP-X's dust like mad.

1. starting the car from garage, cold engine. Temps rose max to 21'C but then dropped to 20'C (1-2'C above ambient).
2. car in parking lot, hot engine. Temps rose to 37'C, then dropped to 27'C, and started slowly rising (car was parked in sun).
3. Back home, oil temps in start 70'C. temps dropped quite fast to 22'C on road, and then rose marginally few degrees in city.

In total vents work quite well. with aluminum intake plenum intake temps seems to be highish when driving slow as manifold heats up from engine, but intake temps drop too when pushing harder as more cooler air flows through it.

Car feels bit brisker now, not sure if its thanks to vents with IC working more efficiently, or from lighter brake discs. maybe combination of both.
goes certainly fast enough for narrow road fun.

pic 1 cool car, drive to park.
7E7603A3-4D21-440F-B133-E21649FE8FB4_1_201_a.webp


pic 2. car waiting on parking lot.
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pic 3 - drive back home.
D1896770-A32D-40B5-AF73-67E0D58D3F7E_1_201_a.webp


pic4 dusty boots
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Michael Knight said:
went for short recreational walk with GR, and same time measured the underhood temps with Rally2 vents.
Temp sensor was located on top of airbox snorkel.

Ducts seem to work faily well from 50kmh onwards. In city they gave 2-3'C above ambient and on road it drops to 1-2'C.
City traffic had few stops. Ambient temps were btw 17-20'C during drive.

here are few temp measures from cold car (50% in city 50kmh, then later 50% on faster narrow road, 80kmh). And back vise versa.
The middle pic is how temps went when car was waiting for 1hr. Oils reached 95'C after first drive.

BTW with fresh discs the RP-X's dust like mad.

1. starting the car from garage, cold engine. Temps rose max to 21'C but then dropped to 20'C (1-2'C above ambient).
2. car in parking lot, hot engine. Temps rose to 37'C, then dropped to 27'C, and started slowly rising (car was parked in sun).
3. Back home, oil temps in start 70'C. temps dropped quite fast to 22'C on road, and then rose marginally few degrees in city.

In total vents work quite well. with aluminum intake plenum intake temps seems to be highish when driving slow as manifold heats up from engine, but intake temps drop too when pushing harder as more cooler air flows through it.

Car feels bit brisker now, not sure if its thanks to vents with IC working more efficiently, or from lighter brake discs. maybe combination of both.
goes certainly fast enough for narrow road fun.

pic 1 cool car, drive to park.
View attachment 36108

pic 2. car waiting on parking lot.
View attachment 36109

pic 3 - drive back home.
View attachment 36110

pic4 dusty boots
View attachment 36111
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Thanks for detailed info, how would the temps have been with non vented OEM bonnet, is there a discernable reduction?
 
RichM said:
Thanks for detailed info, how would the temps have been with non vented OEM bonnet, is there a discernable reduction?
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I measured it some point but should try to search the old results.
This i measured on track day 1.8.2022. It was hot day, temps 25'C or so.
If I rememer correctly I measured temps while driving to track and then on track. the last high peak is when car was stationary in pits after lap run.
The drive to track is 80km/h country road. looks like its 10-20'C above ambients with stock hood.

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Michael Knight said:
I measured it some point but should try to search the old results.
This i measured on track day 1.8.2022. It was hot day, temps 25'C or so.
If I rememer correctly I measured temps while driving to track and then on track. the last high peak is when car was stationary in pits after lap run.
The drive to track is 80km/h country road. looks like its 10-20'C above ambients with stock hood.

View attachment 36121

View attachment 36117
View attachment 36122
View attachment 36118

View attachment 36119
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10-20deg above ambient down to 1-2deg above ambient is a worthwhile improvement. Assume you would also see lower peak engine oil temps?
 
Do you find there’s less lift/more grip on the front with these installed?
 
Nixkf said:
Do you find there’s less lift/more grip on the front with these installed?
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Havent driven on track so hard to judge. I will visit track mid June so then its easy to see if fast corner (+135km/h) trap speeds are any higher than before.
 
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did some 150km of local road funs with GR. its awesome car, except the fuel economy is somewhat miserable when comparing to my audi. I can fill Audi once in a month whereas with GR its one drive and fillup. :D
 
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