The 2021 Toyota Supra Makes Way More Than The Advertised 377bhp
A few weeks back, Toyota revealed an updated version of the GR Supra for the US market, with the power output raised from 335bhp to 377bhp. The thing is, we already knew the pre-update car was good for near enough that figure, as shown when we put an ‘A90’ Supra on the dyno.
Car and Driver’s earlier run on the rollers with the new Supra gave similar results, which leaves us all wondering: what’s the true power figure of the 2021 Supra? The American publication sought to find out, posting the results via the short and concise video you can see above.
Hopefully you’ve now watched it, so we can drop the spoilers. The car achieved 388hp at the wheels, beating the stock crank figure by six horsepower. Factor in driveline losses of around 15 per cent, and you’re looking at a roughly 450 at the crank, which is S55 M Division engine territory for BMW’s B58.
Conservative power figures are nothing new in the performance car world, and BMW is a serial offender - who can forget all those M5s we’ve seen annihilating their stock outputs on dyno pulls.
To extract the extra power, the single-turbo inline-six in the 2021 version of the Supra gets a new dual-branch exhaust manifold and redesigned pistons that change the compression ratio from 11:1 to 10.2:1. The closely related BMW Z4 M40i in US specification already made as much power as the 2021 Supra, so it too is presumably good for a circa 450 output.
Comments
They normally understate the cars by quite a lot, it always happens, I mean look at the Japanese Gentlemans agreement where no car can produce more than 276bhp, when in fact some of the cars there are producing well over 300bhp from the mid 1990s
This 276bhp agreement was put in place to prevent a horsepower war from happening between major Japanese car manufacturers, potentially escalating to the point where someone could get killed in an accident caused by an extremely high-powered car.
Everyone saying it’s the same engine with a different rating can shut up now.
It’s underrated, again. It’s a bit more tuneable, again.
The lower compression and the new exhaust manifold means that this thing will potentially be doing 500 - 540whp with boltons (Including Turbo upgrades, Meth Injection) and 600 - 650whp easy on E85.
Inching and inching closer and closer to A80 Supra levels of power potential off the bat.
Bolt on wise the B58 should be able to make those powers easily even without Meth Injection just whack on a bigger Turbo and give it petrol and you should be golden
AMEN ! I gotta also say… The Mk5 is a better of a sportscar, than the Mk4, because that’s what it was created for. The Mk4 was designed to be quite Posh, while having still some sportyness.
Deathrow 174 What remains to be seen is
a) How well it deals with astronomical power figures, like 1000hp +. This is because the 2JZ was so over-engineered that it could handle 750+ hp easily on stock internals. You know the whole diminishing returns argument.
b) How reliable the B58 turns out to be. Can it sustain these power levels for 50, 100k miles? Only time will tell.
I say all this because so far, the power levels haven’t started to stress the engine out. The potential of an engine is determined as much by its design (such as how well the head flows) as well as its strength; so far, only its design has been tested.
All said and done, I agree with you. For BMW/Toyota to offer this engine, at this price point, in a car as pretty as the Supra, is a good deal.
inb4 C8 fanbois
i think toyota needs a new dyno
Meanwhile at Toyota: “Are you telling me the hp everyone else declares are at the CRANK??”
What HP do you think they declare for the Auris or Yaris?
388whp is like 450 crank
wow
Correct me if I’m wrong guys and gals, but a lower compression allows for more boost whilst decreasing pinging/detonation risks?
In NA cars, increasing the compression ratio results in horsepower increase
Yes
You can think turbocharged engine as already increased compression ratio and if you further increase knocking on the way
This “Supra” is an absolute disgrace. It’s what happens when millennials get to design a sports car that’s supposed to have been a respectful continuance of a legendary car. No manual offered, a BMW engine?… How this p.o.s got to put the Supra badge on and leave the boardroom let alone Japan boggles my mind much like seeing Rosie O’Donnell walking upright.
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