How does the Q60 3.0 TT get 400hp, Stinger 3.3 TT only 365hp?

[ElChanclo]

I've been scratching my head over this one for a while. How can one manufacturer get 400hp out of a twin-turbo 3.0 v6, while another only gets 365hp out of a twin-turbo 3.3 v6?

Is the 400hp engine much more expensive to produce? Is it factory tuning for fuel economy/emissions? Maybe the rest of the drive-train on the stinger wasn't built to handle anything over 365hp?

Figured someone here can give me a simple explanation, settle this nagging detail for me.

 

[NobleCrow]

Its how the manufacturer has it tuned.

Before I had my Kia, I had an Audi A6, my wife had an Audi Q7. Both had the exact same engine, but her SUV had more horsepower. They tune the engines differently.

 

[Kamauxx]

Just like the 2.0t that is in the Stinger used to make 275 hp in the Optima from 2011-2015. In 2016 the same engine was detuned to make the 255 hp it has in the Optima, Stinger, and G70.

 

[forzanerazzurri]

On modern turbo engines, turbo design and PSI setting affect the HP figures much more than the engine size. Thats why you can crank the boost up slightly on a BMW inline 6 and get an extra 100hp fairly easily. Its a balance between reliability and performance that the manufacturer has to gauge. I would expect that since the KIA has a longer warranty, they are probably more conservative on the boost settings and aggressiveness of the engine. I am a BMW owner and do note that they tend to be overbuilt in this area and can adsorb increases to PSI without too much drama (oil cooler, intercooler, engine components are all of high quality). Cant really say anything about the KIA as its so new.

 

[MerlintheMad]

Maybe the rest of the drive-train on the stinger wasn't built to handle anything over 365hp?

Ah, no. When I picked up my Stinger the sales guy was telling me to enjoy modding my car; he knows of one locally that has been chipped to 425 HP and has auxiliary air intakes. I've read elsewhere of a 3.3TT Stinger being tuned to c. 500 HP. But who knows? Some videos about track modded Stingers might shed some light. But there is nothing flimsy or incapable about the drivetrain on the Stinger. It was designed to be worthy of the track, while not designed to be a track car, if that makes sense. Being a high performing luxury gran turismo it will never hang out at the front in a race track role. But there isn't any reason to fear that it will break if raced. It was designed under racing conditions. The Kia test and development center is on the main straight of the Nurburgring.

 

[forzanerazzurri]

Ah, no. When I picked up my Stinger the sales guy was telling me to enjoy modding my car; he knows of one locally that has been chipped to 425 HP and has auxiliary air intakes. I've read elsewhere of a 3.3TT Stinger being tuned to c. 500 HP. But who knows? Some videos about track modded Stingers might shed some light. But there is nothing flimsy or incapable about the drivetrain on the Stinger. It was designed to be worthy of the track, while not designed to be a track car, if that makes sense. Being a high performing luxury gran turismo it will never hang out at the front in a race track role. But there isn't any reason to fear that it will break if raced. It was designed under racing conditions. The Kia test and development center is on the main straight of the Nurburgring.

Straight out of the sales brochure. The truth is, you dont know how the car will hold up long term with extensive modding. You shouldnt really be telling people to boost their Stinger to 500hp without any concern based on what some sales guy said to you. Its irresponsible. Why not back up your claims with facts instead of garbage from the KIA marketing team?

 

[Sabz]

Straight out of the sales brochure. The truth is, you dont know how the car will hold up long term with extensive modding. You shouldnt really be telling people to boost their Stinger to 500hp without any concern based on what some sales guy said to you. Its irresponsible. Why not back up your claims with facts instead of garbage from the KIA marketing team?

Do you follow Tork motorsports? They are getting up there in power and are pushing it to the limits to see what it can handle... I know they are close to 500 wheel torqu.. horsepower in the 400’s tooth wheels

 

[Ruturaj]

The answer is quite simple.

For a naturally aspirated engine (one without turbos or supercharger), bigger the displacement/cc/size/litters more hp it will produce as it can take more air in and more fuel for combustion. That means more power. You can always put more fuel in the engine but there won't be enough air (oxygen) for it to burn. Now if you force more air into the engine, you could put more fuel and get more power (as much as larger engine) out of a smaller engine. That's where turbos and superchargers come in, they push more air into the engine.

Now their are physical limits to how much air you can push in smaller engine as well. But you really don't want to get that far. As more air gets in the engine bigger the combustion and everything else needs to work hard. So naturally aspirated engines will be most reliable and engines with maximum air pushed in them will be least. So, in the end, it comes down to reliability vs power.

Also how the engines are built (how much stress it can take) is also a factor.

 

[eflyguy]

The 2.9-liter TT V-6 in the Alfa Romeo Giulia Quadrifoglio puts out 505 horsepower and 443 lb-ft of torque.

 

[MerlintheMad]

@forzanerazzurri I wasn't recommending anything, only observing what others have already been doing. So far nobody has blown up their Stingers, drivetrain or engine, by modding them. So Kia's marketing assertions are "garbage" to you: I already noticed that you hate Kia. That seems to be your main reason for being here, to diss Kia. I don't care why.

 

[forzanerazzurri]

The 2.9-liter TT V-6 in the Alfa Romeo Giulia Quadrifoglio puts out 505 horsepower and 443 lb-ft of torque.

Ferrari engine.

 

[forzanerazzurri]

@forzanerazzurri I wasn't recommending anything, only observing what others have already been doing. So far nobody has blown up their Stingers, drivetrain or engine, by modding them. So Kia's marketing assertions are "garbage" to you: I already noticed that you hate Kia. That seems to be your main reason for being here, to diss Kia. I don't care why.

I purchased my first Kia in 2012. What about you?

 

[NobleCrow]

I feel like some of y'all are reading way too much into the guy's question. The simple answer is that the manufacturer tunes the same engine differently based on what car it's going into, and they intentionally minimize the power.

Which is why aftermarket tuners can get more out of an engine than the factory tune.

 

[eflyguy]

Ferrari engine.

Not quite, but relevant - and they chose performance over longevity. Nobody buying a Quadrifoglio is expecting 100,000 trouble-free miles!

(For those that don't know, the engine was designed with technology you'll find in the latest F154 V8 used in some recent Ferraris and Maseratis, developed by engineers "with Ferrari backgrounds", and the project was overseen by a former Ferrari engineer.)

 

[eflyguy]

The simple answer is that the manufacturer tunes the same engine differently based on what car it's going into, and they intentionally minimize the power.

... and by "tune", think what "tuners" are doing - not only adjusting the engine parameters, but also replacing components to allow for more performance - exhaust, intake, even turbos. So Kia "tuned" the stinger for longevity but still "spirited" performance. Our friendly tuners are undoing all that hard work, for our much-desired benefit! lol..

 

[eflyguy]

The simple answer is that the manufacturer tunes the same engine differently based on what car it's going into, and they intentionally minimize the power.

... and by "tune", think what "tuners" are doing - not only adjusting the engine parameters, but also replacing components to allow for more performance - exhaust, intake, even turbos. So Kia "tuned" the stinger for longevity but still "spirited" performance. Our friendly tuners are undoing all that hard work, for our much-desired benefit! lol..

 

[NobleCrow]

... and by "tune", think what "tuners" are doing - not only adjusting the engine parameters, but also replacing components to allow for more performance - exhaust, intake, even turbos. So Kia "tuned" the stinger for longevity but still "spirited" performance. Our friendly tuners are undoing all that hard work, for our much-desired benefit! lol..

its nice to come to a Kia, and see the tuners on forums with as much passion about it as I do. I drove nothing but Audis for many years. Tuning Audis was a way of life, not just a hobby. It's nice to see that with the stinger.

 

[Socalstinga]

From everything i've seen and read, along with folks who have begun opening this drivetrain up, all the comments come back and say that the car was overbuilt. The platform is a good one with potential, hell, I've even seen people getting information on internals of the engine itself and the korean tuners surprised at the quality of those internals.

With respect to the OPs question, it's just a question of more boost. I'm sure if you up the standard 14 psi to 16psi, you might get a jump of 20ish HP, maybe a bit more...this is my first FI car from the manufacturer (well sort of, gave back my 335i which was the first year of the FI engine in that car. too many issues...far more than any on this stinger)

 

[Nice Guy]

Look at the torq
Q60 350lbs
Stinger 367lbs
Horsepower sells cars
Torq wins races!

 

[bumble bee]

Some good H/P. Some with 1 turbo.

 

[ElChanclo]

Very interesting. That leads to another question, Can you boost the pressure of the stock turbos much further, or would you have to swap them with larger/better ones first?