Mazda CX‌-90 Forum banner

I6 differences?

4205 Views 46 Replies 14 Participants Last post by  NyquistRate
So there was an article posted by TFL saying the 2 - I6 variants are mechanically identical and the hp/tq rating difference is only due to premium vs regular fuel.

Any way to confirm this as it seems hard to believe. I would assume there are pressure differences between the turbos or something in the computer programming.

I know someone had access to the parts diagrams. Are the turbo units the same part numbers between S and non-S variants?
  • Like
Reactions: 3
1 - 2 of 47 Posts
Interesting point they make. I wonder where they obtained this information? @ASH8 has access to some drawings, not sure about the North American engines though.
2024 Mazda CX-90 Trims and Pricing Have Been Revealed, Starts Just Under $41,000 - The Fast Lane Car (
A quick note on the power bit: Mazda’s consumer website will tell you (at time of writing) that the lesser models put out 280 horsepower and 332 lb-ft of torque. That’s only if you run it on regular 87-octane fuel. You can get the higher output running it on premium-grade fuel, including on the less expensive models.
Car and Driver released an article today, they included psi for the turbos:
2024 Mazda CX-90 Reaches for Luxe (

CX-90s come in three models: Turbo, Turbo S, and PHEV (plug-in hybrid). The first two are powered by an engine that helps the CX-90 feel like the real deal: a 3.3-liter turbocharged inline-six with a 48-volt, 17-hp hybrid-assist system. A 280-hp version of the engine with 332-pound feet of torque powers the Turbo; this version runs on regular fuel. A 340-hp version of the six making 369 pound-feet of torque on premium fuel motivates the Turbo S. Both engines' internals are identical; Mazda turns up the boost on the more powerful variant by roughly 5 psi to about 19 psi and adjusts other engine parameters to take advantage of higher-octane fuel. The plug-in hybrid mates a 189-hp 2.5-liter turbo four with a 173-hp electric motor for a combined 323 horsepower and 369 pound-feet of torque, also on premium fuel.
  • Like
Reactions: 1
1 - 2 of 47 Posts