As an aside, the GMC 1.5T has a 9 speed transmission and can't get
into the 9th gear.

 

The really great thing about GM is your power rating are REAL!
Unlike MAZDA which refuses to post advertised "certified" power information. I read all the time on Mazda forums how people modding up their engine from what they think the base line power output is by specification not understanding why if they DYNO their vehicle seldom even meets those advertised specification.

 

So are you saying the 2.5T doesn't produce the numbers Mazda says it does? Any info to back this up?

I would suspect after the fiasco with the NB v2 Miata and its overstated power prior to release they should have learned their lesson.

 

Its simple MAZDA does not certify their advertised numbers. Plain and simple. In order to publish real numbers you must use the current power rating certification other wise with out the certification you can stretch the actual power rating a bit in advertising. CHEAT! .The certification mandates actual power rating be published when using the SAE certification So when you see the SAE certification the number are real and very duplicatable to the consumer should they DYNO their vehicle. I have already done a few DYNO runs a couple newer Mazda's 2016 ,2017 and a 2019 with skyactiv engines as well compared my results to the shop that does Chassis DYNO testing locally their reports. All I am saying is don't be surprised or unhappy should you get a properly set up DYNO run on your MAZDA and your engine is less then what is advertised under the best condition of a DYNO run..
__________________________________________________ __________________________________________________ ______________
Here is an example of a manufacture listing REAL power number advertised. Now go and compare what Mazda advertises?
EXAMPLE:
GMC 1.5T specifications
1.5L turbo DOHC DI VVT
1.5L turbo DOHC DI VVT Valvetrain: Dual overhead camshafts; four valves per cylinder Fuel delivery: Direct injection Horsepower (hp / kW @ rpm): 170 / 127 @ 5600 (SAE-certified) Torque (lb.-ft./ Nm @ rpm): 203 / 275 @ 2000-4000 (SAE-certified)

Now MAZDA
One example of most all Mazda's from the most resent years.

2019 Mazda CX-5 AWD (Signature) VEHICLE LAYOUT Front-engine, AWD, 5-pass, 4-door SUV ENGINE 2.5L/227-250-hp/310-lb-ft turbo DOHC 16-valve I-4 TRANSMISSION 6-speed automatic CURB WEIGHT (F/R DIST) 3,791 lb (59/41%)

SEE ANYTHING MISSING in the power information from MAZDA? ^^ no SAE Certification

__________________________________________________ ________________
Engine Power Test Code - Engine Power and Torque Certification J2723_201509
This document specifies the procedure to be used for a manufacturer to certify the net power and torque rating of a production engine according to SAE J1349 (Rev. 8/04) or the gross engine power of a production engine according to SAE J1995.

Manufacturers who advertise their engine power and torque ratings as Certified to SAE J1349 or SAE J1995 shall follow this procedure. Certification of engine power and torque to SAE J1349 or SAE J1995 is voluntary, however, this power certification process is mandatory for those advertising power ratings as “Certified to SAE J1349” or “Certified to SAE J1995.”
In the event that an engine made by one manufacturer is sold to a consumer in a vehicle produced by a second manufacturer, engine certification may be completed by either manufacturer or by both manufacturers working together. An example of the latter would be the completion of witness testing by the engine manufacturer with the submission of certification documents by the vehicle manufacturer.

 

With the 2.5 L engine MAZDA depends upon its good torque curve instead of more gears. But I agree with you, we could see better mileage and faster acceleration (when desired) Also the 0 - 60 mph times for comparison tests would improve, as if that's important to most buyers anyway.

Eric B.

 

Point being: My GMC V-6 with less horsepower and less torque would run 1800 rpm @ 65+ and it's a heavier \vehicle.

 

That isn't the point, the low power V6 in your GMC doesn't have the high dynamic pressure and temperatures associated with a 4-cylinder engine.

 

I guess I have a hard time thinking that 'dynamic pressure' is all that high at a steady state 65 mph with part
throttle and the turbo barely working.

My 2¢