Here's How Much Power The Alfa Romeo Giulia Quadrifoglio Really Makes On The Dyno

Illustration for article titled Here's How Much Power The Alfa Romeo Giulia Quadrifoglio Really Makes On The Dyno

The Alfa Romeo Giulia Quadrifoglio is a perfect car in my dreams. In this perfect dream world, Alfa claims the Quadrifoglio boasts 505 horsepower from its twin-turbo V6 and max torque of 443 lb-ft out of the box. But how does it hold up in the real world?

In the fifth installment of the “Owning an Alfa Romeo Giulia Quadrifoglio” series on the AutoAvanti YouTube channel, the car gets a reality check with a dyno test.

According to the Mustang dynamometer results, which the uploader insists consistently provides conservative figures, the Giulia Quadrioglio’s horsepower was measured at 392 HP and the torque at 389 lb-ft at the wheels—lower than the crank claim from Alfa, and quite a bit less than its competitor the BMW M3 makes at the wheels.


Those figures show a 22 percent difference in horsepower and a 12 percent difference in torque over the manufacturer claims, which seems pretty normal. But if the dyno is known to give a conservative rating, it may be safe to assume there may a little more power available than what’s shown here. The car also had to be tested on a four-roller setup because otherwise the test didn’t work.

For comparison, when Matt Farah tested his new, pre-tuned Focus RS on a similar Mustang dyno, the results showed an eight percent difference in horsepower and virtually no difference in torque from Ford’s claimed specs.

So, does this one dyno test seem a little low? Yeah, it does seem kind of low. I guess we’ll all just have to get Alfa Romeo Giulia Quadrifoglios and test them ourselves.


This post has been updated to make the results a little more clear.

Reviews Editor, Jalopnik

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Not surprising; I’d strongly suspect that, when they set their Nurburgring time, they heavily-tuned the car, Ferrari-style. I’d love to see if a stock Giulia Quadrifaculugiciulugiosio could get anywhere close to what the manufacturer claims on that track.

It just didn’t make much sense to me that a car that was slower and less advanced in virtually every metric (0-60, top speed, HP, torque, AWD, etc.) was getting a time around 10 seconds faster than an Audi RS7, and around 20 seconds faster than its nearest competitor (the C63 AMG). Hell, the thing was even faster than an M4 GTS, and that’s a purpose-built track car!

Sure, you can explain some of that away with weight, but the Giulia isn’t that much lighter to justify such an astonishing time. And that’s before you start comparing the Giulia to things like previous-generation Porsches, Lamborghinis, etc...