I recently bought a 03 Tiburon GT V6 and i have a really simple question:
What is the REAL stock horsepower on this engine? I know that the european version (known as Hyundai Coupe FX V6) has around 163-170hp but i searched online and saw reviews that state that the US version (mine and most of you guys) has more hp than the euro version (around 180hp).
Is this true? I'm asking you guys because i'm sick of hearing and reading all kinds of stuff, so i have to ask the experts (you).
Also, i have a K&N air filter, how much gain does this give me in this engine?
Thank you in advance.

I don't know how much different is the Euro version from the U.S. From the official website for U.S. the V6 produces 172hp @ 6000rpm & 181lb.-ft. of torque @ 3800rpm. I can tell you this much: the K&N filter (drop in replacement) gives you almost zero (little to none) increase for hp at the wheel especially if you have no other mods.

Thank you for the info, as for the filter, i guess you would recomend an air induction kit, with filter, pipes and etc, like AEM?
I'm very legally limited here in Portugal in terms of mods, particularly mechanical ones (they can impound my car for having as little as a non-stock muffler)
Sad but true...

Dear JB,

Hyundai originally released data that the stock horsepower for the 2003 Tiburon with V-6 Delta was 180 hoursepower. The US Federal Trade Commission routinely verifies facts used in marketing (their job actually) and pulled a sample of 30 cars for testing and I guess they did not have all 30 engines dyno out at 180 hp. So Hyundai did what many manufacturers do and deliberately listed a horsepower rating of 172 hp in the US. And passed the next sample test with our Federal Trade Commission.

Since the Portuguese police can issue a ticket for illegal mechanical mods, do they actually do a technical inspection of the engine? I ask because intake and exhaust mods are very easy to spot, BUT:

a) have you considered getting an ultra-thin copper head gasket set to raise your compression and horespower? Depending on how much you raise the compression, you can add 25 PS / 24 Nm with the .016 inch gasket set. This can only be discovered with a complete engine teardown. http://www.coppergaskets.us/
B) Regrind you camshafts to 270 degree duration. This can also only be discovered with a very knowledgable mechanic and internal inspection of the engine. Guaranteed 40 PS and 30 Nm. http://www.crower.com/index.shtml
c) Porting and polishing of the upper and lower intake manifold technically is only machining improvements to remove casting errors. Porting and polishing can drastically increase your airflow. Typically, 1mm can be added to the diameter of each intake runner of the upper and lower intake manifold. This diameter increase along with the smoothing and polishing of the intake set is good for 15 hp. This also requires engine teardown to discover, but you technically have only performed normal routine machining to remove casting defects. Takes about 6 hours to properly port & polish the upper and lower IM. http://www.jegs.com/i/JEGS/555/80900/10002/-1

Have fun.

Byron

Thanks, this is exactly the kind of stuff i needed to know, i'll be saving this info for near and distant futures and i hope i can get my Tib running fast and smooth while keeping it stock-looking :liebe011: :grin: