G37 Dyno Up on Automobilemag.com 50+ HP
05-19-2007, 03:36 AM
#46
Originally Posted by CtK
ya that bmw interior is plain and boring compared to the G37
05-19-2007, 07:39 AM
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Great job, guys and gals.
I did a similar comparison of hp/tq curves with the HR motor and noticed a similar trend (how the 335 loses alot of power up high), but it will still make more power from off-idle to 5500 rpm (25-35 hp more at any given time). I think that is a main reason for their low 1/4 mile times as they jump out up front early and then even with less overall power, they end up with good times. The G37 makes a significant amount of HP up top, and will most likely feel faster as you shift through the gears. I still think the 0-60 and 1/4 mile times will favor the 335 by .2 in each category. This is insignificant in the real world.
Now, I get to concentrate on feel, looks, technology, sound, and handling....
I did a similar comparison of hp/tq curves with the HR motor and noticed a similar trend (how the 335 loses alot of power up high), but it will still make more power from off-idle to 5500 rpm (25-35 hp more at any given time). I think that is a main reason for their low 1/4 mile times as they jump out up front early and then even with less overall power, they end up with good times. The G37 makes a significant amount of HP up top, and will most likely feel faster as you shift through the gears. I still think the 0-60 and 1/4 mile times will favor the 335 by .2 in each category. This is insignificant in the real world.
Now, I get to concentrate on feel, looks, technology, sound, and handling....
05-19-2007, 07:40 AM
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Originally Posted by jnmunsey
True but the G37's seats don't really make it easy to hold a can of beer between your legs!
05-19-2007, 08:03 AM
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Automobile tested the BMW a second time to verify their first results - lower torque, more HP, although they explain the reason why. Here's the article and dyno.
In the weeks since we first published the results of that test, we’ve heard some criticism of our conclusion that the 335i makes "closer to 350 hp" than the reported 300. We arrived at that verdict after some quick calculations, but since a chassis dyno only reports how many horses make it to the wheels, it’s admittedly a hard number to verify. We did four runs with that particular car, and the actual peaks were 276, 280, 280, and 283 horsepower. We published the lowest number to be sure there was no claim that we were exaggerating the engine’s output.
But what if this was a one-time fluke? What if that first 335i was a particularly strong example? Or--gasp--a ringer! The answer to that question appeared in the form of another 335i (this time painted space gray metallic) that BMW dropped off last week. Again, without hesitation, we grabbed the keys and headed for the dyno shop.
On the way, we were pleased to find intact the awesome midrange torque and incredible straight-six soundtrack. Reacquainting ourselves with the gauges, we noticed that, as with the original tester, the oil temperature stabilized at 240 degrees Fahrenheit while cruising in sixth gear at 80 mph. Lesser engines would melt at those temperatures!
Temperature? Wait! A quick look at the outside temperature display showed that it was only 78 degrees Fahrenheit outside. The last time we put a 335i on the rollers, it was 92. Everybody knows that engines make more power when they get cooler air--and that turbocharged engines are particularly susceptible to heat soak. We stopped worrying and started getting excited. This one might do even better.
We strapped the 335i down, started it up, and did three runs back to back to back. The results were very consistent, showing peaks of 285 hp, then 282 hp, and, finally, 287 hp. This 335i was even stronger at the top end than the last one, but not as strong in the midrange. Peak torque was stable through all three runs at about 285 lb-ft.
After the final run, we decided to grab audio of the 335i running from first gear through fourth. We expected to have the hairs on the back of our neck stand up at the sound of the 3.0-liter engine at full throat, but what we didn’t expect, of course, was a peak hp number nudging the 300-hp mark. That’s right--shortly after the shift into fourth, this second 335i peaked briefly at 299.93 hp.
Looking closely at the chart, there’s a likely explanation for that outrageous number. No, it wasn’t additional torque from a rough shift--the peak occurred too long after the gear change. Like most turbocharged cars, the computer allows a momentary spike of boost before stabilizing it at a prescribed level. We lucked out, as that spike happened right at the engine’s inherent power peak, so we got a little nudge in the final number. Whether the dyno numbers ultimately translate into 300 hp, 350 hp, or 327.543-to-the-fifth-power-hp, the results speak for themselves: this is one very powerful engine.
In the weeks since we first published the results of that test, we’ve heard some criticism of our conclusion that the 335i makes "closer to 350 hp" than the reported 300. We arrived at that verdict after some quick calculations, but since a chassis dyno only reports how many horses make it to the wheels, it’s admittedly a hard number to verify. We did four runs with that particular car, and the actual peaks were 276, 280, 280, and 283 horsepower. We published the lowest number to be sure there was no claim that we were exaggerating the engine’s output.
But what if this was a one-time fluke? What if that first 335i was a particularly strong example? Or--gasp--a ringer! The answer to that question appeared in the form of another 335i (this time painted space gray metallic) that BMW dropped off last week. Again, without hesitation, we grabbed the keys and headed for the dyno shop.
On the way, we were pleased to find intact the awesome midrange torque and incredible straight-six soundtrack. Reacquainting ourselves with the gauges, we noticed that, as with the original tester, the oil temperature stabilized at 240 degrees Fahrenheit while cruising in sixth gear at 80 mph. Lesser engines would melt at those temperatures!
Temperature? Wait! A quick look at the outside temperature display showed that it was only 78 degrees Fahrenheit outside. The last time we put a 335i on the rollers, it was 92. Everybody knows that engines make more power when they get cooler air--and that turbocharged engines are particularly susceptible to heat soak. We stopped worrying and started getting excited. This one might do even better.
We strapped the 335i down, started it up, and did three runs back to back to back. The results were very consistent, showing peaks of 285 hp, then 282 hp, and, finally, 287 hp. This 335i was even stronger at the top end than the last one, but not as strong in the midrange. Peak torque was stable through all three runs at about 285 lb-ft.
After the final run, we decided to grab audio of the 335i running from first gear through fourth. We expected to have the hairs on the back of our neck stand up at the sound of the 3.0-liter engine at full throat, but what we didn’t expect, of course, was a peak hp number nudging the 300-hp mark. That’s right--shortly after the shift into fourth, this second 335i peaked briefly at 299.93 hp.
Looking closely at the chart, there’s a likely explanation for that outrageous number. No, it wasn’t additional torque from a rough shift--the peak occurred too long after the gear change. Like most turbocharged cars, the computer allows a momentary spike of boost before stabilizing it at a prescribed level. We lucked out, as that spike happened right at the engine’s inherent power peak, so we got a little nudge in the final number. Whether the dyno numbers ultimately translate into 300 hp, 350 hp, or 327.543-to-the-fifth-power-hp, the results speak for themselves: this is one very powerful engine.
05-19-2007, 08:05 AM
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Originally Posted by jnmunsey
The g37 is 3700 pounds for the sport!! 100 pound is significant, 300 pounds is a lot! .1 in a 1/4 mile is significant too to many people.
I prefer a 3000lb car tops, but in the luxury segment I can understand that to be difficult. Still, 3700 is hard to swallow. That is creeping in on Charger and future Challenger territory.
I prefer a 3000lb car tops, but in the luxury segment I can understand that to be difficult. Still, 3700 is hard to swallow. That is creeping in on Charger and future Challenger territory.
05-19-2007, 08:41 AM
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Wow, great numbers for the the G37 but the 335 will probably feel and be faster because of the higher torque. The G37 will out-handle the 335 because of the 4 wheel steering though.
Last edited by gnut; 05-19-2007 at 08:43 AM.
