Impressive dyno results for Infiniti’s new 3.7L V6

[Zafiro]

It’s been well documented that BMW’s new twin-turbo inline six from the 335i produces significantly more power than its official 302hp rating suggests. We reported earlier about a test of a brand new 335i Coupe on a dyno, which resulted in outputs from the motor ranging from 282 to 300hp at the wheels. Estimating drive-train loss of roughly 15-20%, this equates to roughly 350 to 375hp at the flywheel. The publication that ran the earlier tests on the BMW, Automobile Magazine, has now run Infiniti’s new G37 Coupe on the dyno and achieved some exciting results for the 3.7L V6.

The new motor debut’s Nissan’s VVEL technology, which uses infinitely variable valve timing adjustment, similar to BMW’s Valvetronic system. The official ratings stand at 330hp and 270lb-ft of torque, although Infiniti is yet to release finalized peak output ratings. Tests on the dyno reveal that the new VQ37 produces 22% more power than the smaller VQ35 from the previous G35 but is only 5.6% larger in displacement.

The dyno charts also reveal that the new 3.7L unit produces a flat torque curve from 2,000rpm all the way until 5,000rpm and is still producing 85% of its peak torque at redline. The engine is also rated at having just 37hp more than the previous 3.5L motor but developed 51 more horses on the dyno. Taking into account driveline losses of 20-25%, we’re looking at a flywheel figure of around 365hp. Bravo Infiniti.

 

[Merc1]

Automobile Magazine - 2008 Infiniti G37: On the Dyno








The 2008 Infiniti G37 Coupe is the first car to use Nissan's new 3.7-liter V-6. Infiniti still hasn't finalized peak output ratings, but estimates that the engine makes 330 horsepower and 270 lb-ft of torque.

The new VQ37VHR engine, as it's called, is the first V-6 sold in the USA to use infinitely variable valve timing in place of a throttle. This system, called VVEL, is the second such system on the market -- BMW's Valvetronic was the first.

We discussed the new engine in depth in previous articles on the G37 (see related links below) so let's cut right to the chase: The new 3.7-liter is only 5.6 percent larger than the old engine, but made almost 22 percent more power on a chassis dynamometer.

We tested the 2007 G35 Coupe 6MT on the same dyno a few months back. When attached to the six-speed manual transmission, its 3.5-liter is rated at 293 hp @ 6400 rpm and 258 lb-ft @ 4800 rpm. Its power peak is very close to the 6600-rpm fuel cutoff - this is an engine that loves to rev. Looking at the dyno chart, you can see that it comes alive just over 2000 rpm and produces a fairly constant amount of torque until just over 5000 rpm. Torque (and the corresponding push in your rear) drops off only slightly, as the engine is still producing over 85% of its peak torque at redline. Impressive indeed.

he G37's engine, however, blows that performance away. It's rated 37 horsepower higher, but the G37 we tested put 51 more horses to the rear wheels. Since this was measured on a chassis dyno, we can't know for sure how much of that increase is due to higher engine output versus lower driveline losses. However, since the drivelines are similar, we'd guess nearly all of this increase is brute force from the new motor. Think about it this way: If frictional losses are a constant percentage, you'd have to add 63 horsepower to the G35's engine to make it put 51 more to its wheels. This is a big, big jump in power.

The best news is that Infiniti wasn't exaggerating about its other claims: the new 3.7-liter is stronger than the 3.5 both at low revs and high revs. Its torque curve is flatter, too. Throttle response (if you can say that about a car without a throttle) is instantaneous, the 3.5's coarseness has been tamed, and I got an indicated 27 mpg - with the air conditioning switched on at 80 mph - on the way back from the dyno shop. So if there's any drawback to VVEL, we haven't seen it.

See the dyno charts for more information, and be sure to check out the videos to hear the G37 at full bore.

2008 Infiniti G37 Coupe - Dyno Charts - Automobile Magazine

2008 Infiniti G37 Coupe - Dyno Videos - Multimedia - Automobile Magazine

M