In 2026 Toyota are running the supra with a 2UR-GSE ENGINE, in the V8 Super cars this will be fantastic, as the series is getting a little boring with Camaros and Mustangs bring it on cheers.

 

Given how powerful the B58 has become, the 2UR would actually be a downgrade in performance. I'm sure this change has more to do with the comparability of the engine for Toyota's racing program like how it was used in the RC-F but it's odd that they didn't just go with the new BMW S68 V8 which is probably much more compatible with the Supra platform.

 

They are racing shells with stand alone management anyway, might as well use an actual Toyota engine and rub it in harder that we never got it as a factory car.

 

That's a good point!

 

The change is because the series is a V8 only series

 

I'm aware of that, but I was wondering why they didn't use BMW's V8.

 

To maintain the facade that the Supra is a Toyota I guess?

 

My guess is because the car isn't really a Supra, it's a Toyota built chassis built to Supercars Championship's specs with a body on it that resembles a Supra. Similar to how the Toyota Camry in NASCAR has nothing in common mechanically with a Camry. Since the product is all Toyota, no sense asking BMW to sell them S68's and engineer them to fit a Toyota chassis. Specs probably also don't allow forced induction.

 

Toyota/Lexus is just head scratching organization.

This V8 dates back to 2015 when RCF was introduced.
They have not upgraded it and refused to bring out V8 twin turbo which was tested and developed.
The V6 turbo that they put in the LS was not used at all. Finally they put in the new LX and GX.

 

2006 actually with the LS460.

 

ISF 2UR was completely reworked from the 4.6 Liter V8 in 2005 - 2006 with help from Yamaha and then the engine was again completely redesigned in 2012 - 2013 for the Lexus RCF. RCF engine was originally designed for the ISF CCSR racing car and was used as a testing bed for the RCF engine and chassis, suspension development with the ISF CCSR. Engine was redesigned into a high revving engine and all of the internals were lightened, compression ratio increased, engine speed increased, redesigned D-4S, 95 HP/Liter achieved N/A, throttle body made bigger etc.

The engine technically should have a different designation than the 2UR-GSE, but in Japan there are implications of changing engine code, which Lexus did not want to spend any time or money on. Only the bottom end block is shared, but rest was all-new and not swappable. It has been the more or less the same since then.

 

Still a UR engine. Still fundamentally unchanged, you also admit it's a heads/cam package on the same bottom end.