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BMW Z4 Roadster
First turbo four model will arrive this fall

Earlier this year, we reported that BMW's normally aspirated inline-6 engines will be ushered out and replaced by a new family of turbocharged four-cylinder engines. BMW today confirmed that four-cylinder power would return to U.S.-bound BMWs after a 10+ year absence. 

The first model to get BMW's new 2.0-liter TwinPower Turbo four-cylinder engine will be the Z4 sDrive28i Roadster (say that five times fast). The engine develops 240 hp and 260 lb-ft of torque (30 percent more torque at 1,500 fewer RPMs than the naturally aspirated 3.0-liter inline-6).

BMW says that the new turbo four will be 20 percent more fuel efficient than the inline-6 when paired with the 8-speed automatic transmission. We're sure that there are fuel efficiency gains to be made with the 6-speed manual transmission as well, but it's likely nowhere near 20 percent (or else BMW would have mentioned it in the press release).

The Z4 sDrive28i Roadster will arrive in showrooms this fall, and the turbo four will likely filter down to other BMW models soon after.



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RE: Just wish it ran on regular
By YashBudini on 4/19/2011 12:23:09 AM , Rating: 2
quote:
According to Hyundai engineers, putting premium in it will give you no more power.

That's a huge waste of potential. And why? Lack of knock sensors? Inadequate programming to optimize the use of better fuel? Sorry, going from 87 to 93 octane on such a vehicle should actually show something on a dyno. And significant is more like it.

Perhaps you need Service Pack 1?


RE: Just wish it ran on regular
By Reclaimer77 on 4/19/2011 12:31:17 AM , Rating: 2
The only thing I can think of is they are running very low compression with very little boost.

Kind of a shame...


RE: Just wish it ran on regular
By Spuke on 4/19/2011 12:54:21 AM , Rating: 2
quote:
The only thing I can think of is they are running very low compression with very little boost.
With direct injection, you could use lesser octane at the expense of hp. I'm betting that's what Hyundai did (might be looking at a 300hp engine in that car). I can run 87 in my Solstice (GM says I can) but it'll drop 20 hp and the gas mileage isn't any better. And some have reported some instances where they got knock. The small difference in price isn't worth it IMO.

NOTE: I didn't try it someone else did.


RE: Just wish it ran on regular
By Reclaimer77 on 4/19/2011 7:29:23 AM , Rating: 2
Yeah good point about the direct injection. It totally slipped my mind to be honest.

I just can't believe that to save a few dollars people are running regular pump gas in their turbo cars. Even after they hear knocking!? I can just imagine what those pistons look like, all pitted up like a golf ball. Head gasket about to bust from all the over compression.

I agree with you fully. NOT worth it. Unless you drive like grandpa all the time and never get into the boost, you are playing with fire.


RE: Just wish it ran on regular
By Brandon Hill (blog) on 4/19/2011 8:58:38 AM , Rating: 2
Let me see... in my case, Hyundai says regular only and the vehicle has a 10-year powertrain warranty. Seems to me that it would be in their best interest to not f**k it up :)

That being said, I'm gonna just say that their powertrain engineers know a lot more about this than you or me ;)


RE: Just wish it ran on regular
By Spuke on 4/19/2011 11:58:42 AM , Rating: 2
quote:
That being said, I'm gonna just say that their powertrain engineers know a lot more about this than you or me
I'm certain they do AND it easily could be done with direct injection. More than likely they're leaving some hp on the table. In the Solstice's case, there was no difference in fuel economy. My guess is that Americans tend to focus on price at the pump instead of overall cost, Hyundai detuned the engine to 87 octane for PR points. Since that engine is more than likely tuned to NOT recognize higher octane, it would not behoove you to put anything other than that.


RE: Just wish it ran on regular
By Reclaimer77 on 4/19/2011 7:09:34 PM , Rating: 2
Nah the ECU knows. Thanks to the power of Google, it looks like you lose about 10hp in the Sonata when the ECU is in the regular octane fuel map. The Sonata is NOT tuned to assume you are running regular. It has the same type of learning/reacting fuel mapping ECU like is in every other vehicle.

Here's the fun part. How does the ECU know when you tank up with 87 octane? When the knock-sensor kicks in, the ECU remembers the engine RPM and load and other factors of when the knock happened and goes into a sort of "knock learning" mode.

Knock sensors and ECU timing/ignition retarding aren't infallible. So basically the knocks that the ECU uses to determine what type of fuel you are running can STILL be the knocks that kill your engine in a turbo car.

Like I said, playing with fire. Brandon has a lot of faith in the same engineers who about five years ago were cranking out the most crappy cars on the road: Korean.


RE: Just wish it ran on regular
By YashBudini on 4/19/2011 8:15:04 PM , Rating: 2
No company starts by making the perfect car. Even if a company has been in business for years a sudden explosion of growth will inevitably compromise quality until the company fully adapts.

Hyundai is actually quite large, turning on a dime is rather unrealistic.

http://en.wikipedia.org/wiki/Hyundai

Race has nothing to do with it.


RE: Just wish it ran on regular
By Reclaimer77 on 4/19/2011 8:48:22 PM , Rating: 2
Right clearly I was referring to their race instead of the REGION THE CARS COME FROM!

Never waste an opportunity to make me fit a stereotype though Yash. Keep up the good work.

Fact is Hyndai and Kia are way better today than they were. And they need to keep it if they want to shake their previous image.


RE: Just wish it ran on regular
By YashBudini on 4/19/2011 10:37:52 PM , Rating: 2
Everyone must deal with guilt by association. However, it seemed that way, with or without your signature.

A friend just got a new Hyundai. IE a brand new replacement under the Lemon Law. 8 out of 30 months in the shop, it was last waiting for it's 4th transmission. Typical dealer inventory does not include whole transmissions. (They should have considered they're dealing with a symptom and not a cause by now.)


RE: Just wish it ran on regular
By Reclaimer77 on 4/20/2011 7:42:16 AM , Rating: 2
quote:
Everyone must deal with guilt by association. However, it seemed that way, with or without your signature.


Fair enough.

quote:
A friend just got a new Hyundai. IE a brand new replacement under the Lemon Law. 8 out of 30 months in the shop, it was last waiting for it's 4th transmission. Typical dealer inventory does not include whole transmissions. (They should have considered they're dealing with a symptom and not a cause by now.)


WOW!

Sounds like your friend needs to lawyer up. That sucks.


RE: Just wish it ran on regular
By KC7SWH on 4/19/2011 11:58:23 AM , Rating: 2
Everywhere around where I live regular is only 85 and the 87 that Hyundai wants would require the mid grade which is usually 88 (varies as mid is a mix of premium and regular). So regular only would indeed f**k it up.


RE: Just wish it ran on regular
By YashBudini on 4/19/2011 1:30:49 PM , Rating: 2
85 octane? Apparently they accounted for employees peeing in the storage tanks.


By EricMartello on 4/21/2011 11:50:15 PM , Rating: 2
Dude, he's driving a hyundai. It's practically a disposable car. If his engine blows up he can always get another Hyundai. Maybe he got a bogo deal on that Sonata.


RE: Just wish it ran on regular
By Brandon Hill (blog) on 4/19/2011 6:51:18 AM , Rating: 3
Because it's a FWD family sedan and they didn't want a lot of torque steer? 274hp is plenty.

I'm sure they'll be pushing 300+ and require premium when the refreshed Genesis Coupe gets this engine.


RE: Just wish it ran on regular
By gman7664 on 4/19/2011 10:01:04 AM , Rating: 2
No disrespect intended however you should check out a Gen 1 Toronado. Granted, the SAE HP ratings did change a bit, but still the torque doesn't change... and they call it torque steer, not power steer so the HP rating difference does not really matter.

The 1968-1970 Toronado with the W-34 option produced 400 HP and 485 Ft-Lbs of torque. The Europeans at the time (early 60s) claimed it was impossible. They were wrong. These cars have exactly zero torque steer as they have equal length half-shafts. Which, BTW, are about 2" in diameter unlike modern shafts which are as small as about .5" on something like a Honda CRX (in the IRS rear which can be seen from behind. I always marveled at the toothpicks they drive those little matchboxes with...)

I am in the process of rebuilding one of these 7.5 liter stump pullers and when I finish it should be in excess of 450 HP and 550 Ft-Lbs. The car will drive just fine with all this power because Oldsmobile so completely over-engineered the thing they were able to put this power package into a 12,000 lb GMC motorhome.

I'm just sayin' :o)


RE: Just wish it ran on regular
By YashBudini on 4/19/2011 1:26:49 PM , Rating: 2
As GM showed us it's not that hard to build an adequate transmission when efficiency is of no concern. This is why they have so many issues currently. Anybody can make a tank transmission, but try spinning it. And you also have to take into account what they deemed "reliable" back then, if it lasted 50K miles it was sellable.

You forgot the 1970 Eldorado, 500HP, 500 ft lbs of torque, FWD. Did we get a glimpse of one in Terminator in the parking garage?

That said one enterprising young man back in the days of Hot Rod Mag put a big block Chevy and Toronado trans mid ship in a Vega wagon. The trans powered the rear wheels. Mid 12's and street wheelies were the results. Overkill for me, back then I would have liked Chevy's current V6 and trans from a Camaro into the Vega. The idea of keeping my "feet" on the ground had appeal, the extra weight of a cast iron V8 up front did not, like most conversions.


RE: Just wish it ran on regular
By JediJeb on 4/19/2011 5:56:51 PM , Rating: 2
Back in the days, those were some fun times. I would liked to have seen that setup in the Vega. When I was in high school the big competition in town was a nicely built V8 Vega versus what was aptly named Super Falcon. Some kid had built a Ford Falcon with a 428SCJ in it, it was a monster at the local drag strip, and many back roads too.


RE: Just wish it ran on regular
By YashBudini on 4/19/2011 8:20:39 PM , Rating: 2
Back in those days real hot rodders needed a lot more than a huge checkbook to see their dreams materialize. Home garage fabrication showed real ingenuity.


RE: Just wish it ran on regular
By YashBudini on 4/19/2011 1:11:32 PM , Rating: 2
The answer is not torque steer, the car could be programmed to make use of the octane at higher revs, much like it limits boost at lower revs now.

Actually the answer lies in a prior DT article, the one where customers have almost zero knowledge of how hybrids work. Years later the engines idled accordingly.

Your car's "position" on premium fuel is based on demograpghics. The average buyer is "cheap". The $$$ and effort is not cost effective in your segment. They certainly can't require premium fuel, the cheap customer would try to cheat on any account. The amount of drivers who would spring for premium is low, and the whole idea of less power with low grade gas can seem insulting if you're not technically aware.

GM didn't understand this cheap business when it released the Vega with solid lifters. No cheap customer was even going to read the manual, let alone perform regular valve adjustments.

IE, Hyundai has indirectly insulted your intelligence, lumped you into with the crowd.


RE: Just wish it ran on regular
By YashBudini on 4/19/2011 1:35:05 PM , Rating: 2
quote:
Years later the engines idled accordingly.


Sorry, wanted to put this sentence last after the Vega business.


RE: Just wish it ran on regular
By YashBudini on 4/19/2011 1:37:24 PM , Rating: 2
quote:
lumped you into with the crowd.

Here the brain is processing 2 similar sentences in parallel with 1 result. Duh.


RE: Just wish it ran on regular
By SniperWulf on 4/20/2011 8:31:09 AM , Rating: 2
Not really. Hyundai knows their market. They know that requiring premium grade fuel would kill the sales of those Sonatas. I just bought one for my fiance and even on regular unleaded, the engine is quite stout and gets better gas mileage that what the window sticker reports.

I'm pretty sure Brandon can report the same


By Brandon Hill (blog) on 4/20/2011 9:28:44 AM , Rating: 2
I've gotten better in the city, but not the highway (as I tend to drive 70 - 75 mph on the hwy, and the faster you drive, the lower your MPG).

I've been averaging 24.88 mpg over the course of 6,000+ miles (using hand calculations; the onboard computer is off by about 1.4 mpg). Roughly 90% of that driving has been in the city.

The vehicle is rated at 22/33.

When I'm driving on the highway, I average anywhere from 30 mpg to 31 mpg. About the highest I've ever seen on the highway is about 32 mpg.


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