2012 Genesis R-Spec - Big Mistake!

[kf4zra]

not that i really care that much about mileage anyways, when the needle gets to 1/4 tank, I go to the station and make it go past the F mark.

Life is too short to worry about 5mpg

 

[Mark_888]

The point being that the tau engine works perfectly fine on 87 even though everything you said might be true. Difference in power cannot be recognized by a dyno, let alone a person.

I am not sure how you can say that the difference in power cannot be measured on a dyno, since Hyundai specs say there is a 7 HP difference between using regular and premium on the Tau. I am not saying whether 7 HP is noticeable, or whether it is worth the price difference in the gas, only that someone must have measured the difference to be 7 HP.

 

[geops]

There is no perfect dyno. Even the most expensive ones have quite large error margin. The dyno error margin is higher than that hp difference percent-wise. Therefore, that difference cannot be proven on a dyno. There might be a different way hyundai is testing power directly at the engine which could be a lot more accurate.

 

[Mark_888]

Saying that higher octane means higher mpg for this car is not technically accurate.

The only thing I would point out is that Hyundai has to specify the octane used during EPA tests for mileage. It would be to their competitive advantage to be able to advertise that the engine runs on regular gas at a given EPA city/highway/combo rating, and they would be stupid to specify premium during the EPA tests if the mileage results were identical with regular.

 

[PMCErnie]

Most of what you wrote are not "maintenance" issues.

I live in Phoenix too but took delivery of my '12 R-spec in December 2012. I have had no problems - none.

Who was your dealer and why did you keep going back after they were so apparently inept? What was the cause of the indicator lamp?

You didn't make the shop fix your Nav/Entertainment fuse but instead accepted their lame workaround?

The combination of poor tire mileage and poor gas mileage indicate to me you are heavy on the throttle and perhaps a bit hasty on the corners. I just passed the 8,000 mile mark in mine and the tires are showing no wear whatsoever. I have them rotated every 5,000 miles (you didn't say whether you did that or not).

I have run regular in my R-spec since new (along with full synthetic oil) and my mileage in town runs in the low 20's. I recently did a round trip to L.A. and got close to 30 MPG and that was running 75-80 most of the way. There is no reason to run premium gas in the Genny unless you like spending money.

I wouldn't call your car a lemon without knowing more details about the failures but it seems like you bought a performance car and are driving it like one.

Tuna is right on all counts! I would only add that the OP needs to change dealers because his current one is inept. That dealer should have replaced his nav/radio head unit long ago. The fuse reset is just an emergency fix, not a long-term solution.

 

[427435]

I believe the knock sensors are in use and timing is being adjusted constantly with either premium or regular gas. Why not optimize engine performance with whatever gas is in the tank (maybe not up to 110 octane av gas), but with any normally available gas.


By the way, I thought the difference was 9 hp, not 7 hp between premium and regular gas.

 

[brfatal]

By the way, I thought the difference was 9 hp, not 7 hp between premium and regular gas.

It could be. I was going off what I remembered off the top of my head.

 

[geops]

It could be. I was going off what I remembered off the top of my head.

So basically, running our engine with 87 makes it the equivalent of the 2015 5.0 Engine

 

[landtuna]

There is no octane sensor that determines what map to run.

No vehicle I am familiar with has an "octane sensor". What they all have is a "knock sensor". These have been standard in gas engines for many years (since fuel mixtures were leaned out to improve emissions). Provided the knock sensor is in operating order you should not have any issues running 87 octane in an R-spec. And as you go higher in altitude the octane is reduced in both premium and regular to compensate for the decreased air density.

This is what results in that "7 horsepower" reduction.

It's actually 9 HP in my manual.

My manual states that premium is optional and regular will not cause harm to the engine therefore, if it should I will require Hyundai to (a) give me a new engine and (b) change the wording in their manual. I am not going to second-guess their engineers and the millions of dollars they invested in designing and building this engine. I figure they know what they are doing. OTOH, I do not run my Genny hard enough that knocking would be a problem unless the knock sensor failed.

 

[fiveoh]

There is no perfect dyno. Even the most expensive ones have quite large error margin. The dyno error margin is higher than that hp difference percent-wise. Therefore, that difference cannot be proven on a dyno. There might be a different way hyundai is testing power directly at the engine which could be a lot more accurate.

It's called an engine dyno. That's how motor power output is measured. Chassis dynos are worthless for specific power output. They're good for relative numbers, but most useful for allowing a car to run under some load without being on a racetrack or the street.

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[ComputerBudda]

I have driven the car normally...I haven't tried to make the car do more than it is capable of. I spent five hours at dealership today for electrical issues. The most likely culprit was the battery and it was replaced (the original was still in there). Get home and...nope - same electrical issues: door locks, sound system, navi all don't work and clock and gauges reset to factory. I've had it with this car. Going to get this latest problem fixed and then going to trade it for an Acura TL. $50K cars shouldn't be like this - 10+ trips to dealership this year.

Typically electrical problems like you have are caused by bad grounds. Unfortunately, there are several grounding points on the Genesis (and all modern cars) Demand the dealer check them all. Having you wiggle the fuse is a bunch of crap and you should never have put up with that. I don't blame you for wanting to dump the dealer.

 

[BogKid]

My last car that the Genesis replaced was an Acura. My Acura was in the shop for numerous problems, so any car manufacturer can build a bad car. I do agree that Honda in the past has had a very reliable record but Hyundai is nearly equal now and my Genesis has been the most trouble free car I have ever owned. I have owned Acura, BMW, Mercedes, Toyota, Ford, Mercury, and Chevy.

I have a 2009 4.6 Genesis with 38,000 miles on it. The ONLY problem I have had (am I tempting the fates?) was a jam-up in the CD changer which was essentially my fault (paper label). Otherwise, nothing has gone wrong.