2010 Genesis 4.6, 375hp or 385hp

[kayroe]

I own a 2010 Genesis 4.6. The window sticker showed that the engine puts out 375hp. Now I'm noticing that Hyundai's web site says that the 2010 model was bumped up to 385hp. I was wondering if anyone has more information on this.

 

[Midnightsun]

Both figures are correct. I produces 375 ponies on regular gas and 385 on premium and is recommended to run on either. I seriously doubt you will notice the difference though.

 

[nearwater]

I thought it was 375 on premium and 365 on regular.

Dan

 

[Dimitry]

I think it was a mid-year upgrade to the engine, when they put the new modified Tau inside, is another question

 

[DavidNJ]

Production variation can easily be 10hp. A/C can be 10hp. So...you probably could never tell the difference. However that let them publish a higher number while letting cost conscious Hyundai owners (which is nearly all Hyundai owners) use regular gas.

Assuming a vehicle weight of 4000#, it is roughly the same as the difference between an empty tank and a full tank of gas. Can you tell the difference in performance?

Do you think anyone can tell the difference of regular 198hp Sonata to a 200hp SE? There the difference is similar to having a couple of bags of groceries in the trunk.

 

[Paulroger]

Ignoring cost and HP, is there any other advantage to using premium gas vs regular? My previous mechanic swore the engine and injectors would be cleaner if I used higher octane.

 

[OBCT]

Ignoring cost and HP, is there any other advantage to using premium gas vs regular? My previous mechanic swore the engine and injectors would be cleaner if I used higher octane.

I'm far from an expert, but with all the things I've read online dealing with this subject, I'm quite sure your previous mechanic was/is absolutely wrong on this one.

The "type" of gas (what brand you buy) can make a difference in engine cleanliness because each supplier uses their own blend of detergents and/or additives, each with different "benefits". Octane alone has no bearing whatsoever on this.

Someone correct me if I'm wrong.

 

[DavidNJ]

I know Shell uses a different mix...but you can by the additives at Costco and just throw them in every tank. Note that they are mixed locally and you are never 100% sure what you are getting at the filling station. So adding it yourself is probably better. It costs less to add

The Chevron additive at Costco was just over $16 for 6 bottles including tax. Each bottle was rated for 16 gallons, although it should be fine for a full tank. It should work out to around 15¢ per gallon.

 

[jwaters943]

It seems some of you are confusing 2 separate things here.

1)The 2009 Genesis and early-build 2010 4.6 models are rated at 368hp w/ regular and 375hp w/ premium

2)Later build 2010 models received several small changes/revisions which bumped the hp to 385hp on premium unleaded (torque is unchanged at 333 lb-ft).

You may not feel the extra 10hp, but all of the changes made collectively should result is an ever so slight improvement in the throttle response and smoothness of the V8 engine. If you window sticker says 375, you probably received a Genesis that was built before this change took place.

From C&D: The impressive Tau has also received a host of small upgrades for the 2010 Genesis, including an additional flap in its two-stage variable intake for better breathing, the intake and exhaust valves are larger, a quieter timing chain has been installed, the pistons get a chromium-nitride coating to reduce friction.....But likely the most noticeable improvement is a claim of more aggressive-responding transmission programming when driven hard.

http://blog.caranddriver.com/stuff-we-learned-today-hyundai-genesis-v-8-to-receive-10-hp-bump/

 

[DavidNJ]

I wonder what they changed. Probably something very, very small...different ignition map, etc.

If it was just software, it could probably be backdated...except that emissions laws may prevent that.

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[jwaters943]

Read my post above.

 

[Genesis-Shopping]

Am researching (and maybe buying soon) a 2010 Genesis sedan.

Can anyone tell me how to identify (by the VIN or the date of manufacture) on a 2010 sedan whether it has the 375 hp engine (using premium) or the 385 hp engine (mid-year upgrade)?

I have read through some forums and done some searches and haven't found anything, other than the switch occurred sometime in calendar 2010.

Better to buy the 385 hp engine, if possible.

Thanks much!

 

[BacktoHyundaibychoice]

Am researching (and maybe buying soon) a 2010 Genesis sedan.

Can anyone tell me how to identify (by the VIN or the date of manufacture) on a 2010 sedan whether it has the 375 hp engine (using premium) or the 385 hp engine (mid-year upgrade)?

I have read through some forums and done some searches and haven't found anything, other than the switch occurred sometime in calendar 2010.

Better to buy the 385 hp engine, if possible.

Thanks much!

Why is it better?

 

[msitter]

There were changes to the exhaust valves(bigger I think) and some tweaks to the variable cam timing. The intake manifold had some internal changes. These improvements showed up on cars with an early April 2010 and later build date. It didn't show up on the website until much later. Probably to move 375hp cars without problems. Auto manufacturers are loathe to announce improvements if it will make existing stock hard to move.

 

[robcar]

This thread is somewhat confusing. I just bought a 2010 4.6 with Technology Package. The date of manufacture on the door jamb is March 9, 2010. Can anyone tell me what (if any) improvements were added to this car versus earlier production of the 2010 4.6? Do I have 375 hp or 385 hp? Am I missing anything that was added later in 2010?

 

[MHT]

This thread is somewhat confusing. I just bought a 2010 4.6 with Technology Package. The date of manufacture on the door jamb is March 9, 2010. Can anyone tell me what (if any) improvements were added to this car versus earlier production of the 2010 4.6? Do I have 375 hp or 385 hp? Am I missing anything that was added later in 2010?

I have a Feb. 2010 build date and was told the car has 385 hp but from what I have read on this sight that may be incorrect.

 

[msitter]

The first of the 385hp cars came with the mid April 2010 builds.

 

[robcar]

I just found a Road & Track article on the internet from Feb. 11, 2011 regarding their one-year long-term road test of this car ("Road Test Wrap-up: 2010 Genesis 4.6" which describes this car as "a 4.6-liter 385-bhp V-8 Sedan." I suppose Road & Track could have the hp wrong, but this car was built, obviously, before Feb. 11, 2010. At any rate, even if they're wrong and it's really 375 hp and not 385 hp, after 34,000 miles on the road, they rave about the car!

 

[homeofstone]

I just found a Road & Track article on the internet from Feb. 11, 2011 regarding their one-year long-term road test of this car ("Road Test Wrap-up: 2010 Genesis 4.6" which describes this car as "a 4.6-liter 385-bhp V-8 Sedan." I suppose Road & Track could have the hp wrong, but this car was built, obviously, before Feb. 11, 2010. At any rate, even if they're wrong and it's really 375 hp and not 385 hp, after 34,000 miles on the road, they rave about the car!

Earlier in their test they say it has a 375 hp engine. so somebody is wrong at road and track.

 

[Ruissimo]

OKAY... I WILL FIX THIS:

2009 Specs (375 HP)

2010 Specs (385 HP)

2011 Specs (385 HP)

2012 Specs (385 HP)



I don't think Hyundai would advertise 385 HP on a particular MY unless all cars in that MY actually pulled 385 HP. Could I be wrong? SURE.