GR Corolla vs GR Yaris - Head, Exhaust Valves & Springs (G16E-GTS) 

Yep! Will get them under a proper spring tester and post a video.

Hey @apex_gr, just uploaded a video comparing the spring rates: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-P9_vG9hyJYE.html

Will do! Anything particular you had in mind that you'd like to see or are curious about between the GR Yaris and GR Corolla?

@@denstojI always hear that the bottom end on the corrola is beefier. Is that true?

We need to do further investigation but yes it was rumoured the alloys in the pistons have changed. Made a short video about all the engine changes a while ago here: GR Corolla vs GR Yaris: Top 5 Engine Differences ru-vid.comS87hXoSNhWg?feature=share

@@denstoj that extra cam shaft support made me curious, could you add it to the Yaris? (Just as a safety precaution when tunning)

@@denstoj Your clips are actually very useful and so well done, thanks!

Thank you! Yes, we were totally thinking the same. When the GRC came out we were doing our research too and made this video which mentions the valves being different but turns out they're not! ru-vid.comS87hXoSNhWg?feature=share

I like your eagerness! Just confirming though, which swap are you referring to?

What power are you aiming for out of this build? Are there any restrictions in your rally competition to use aftermarket engine internals? Just curious why you'd run OEM parts if you're building an engine for racing.

@@denstoj we use a 34mm turbo restrictor. All apart is free. However, we aim for high torque under 4500 rpms more than high horsepower at 5000 and above. Thanks for the quick answer 🙌

Ah got it! So many low end pulls from the cornering. That levels out the power between competitors nicely. Have you considered running the 267-EZ Kelford Cams?

@@denstoj I already have the 267-B, but now I see that the EZ ones can solve it

Yes, the EZ would be the ones to get for your setup. Kelford are running a 10% off promotion on their G16E cams for July as they just finished a big run of production. 😎 Let us know if you have any other questions.

Yes! The GR Corolla head was about double the price. Potentially due to availability at the moment so might drop in the future.

@@denstoj So the follow up question has to be (and you know everyone is thinking this) - even for a Corolla, do you just order the Yaris parts? 🤭

@@DDB168 Are you building an engine at the moment?

@@denstoj Yes but not a Toyota (Subaru EJ204). This issue exists with a lot of Japanese car models and given the exhorbitant prices of auto parts in Australia, I reckon it's worth trying, albeit with some small risk.

Ah got it! We were going to look into importing from Japan but for now, it was easier to order directly from Toyota in Australia considering the GR Yaris head was reasonably priced but yes, definitely worth trying. Regarding if the GR Yaris head would work on the GR Corolla, we'd have to look further into how the vacuum pump fits with the camshaft to give a definitive answer.

I’ll check for you and report back 🫡

GR Yaris head is $1,000 AUD and GR Corolla is $2,270 AUD