Motortrend has tested the G37 auto
Originally Posted by trey100
Not so sure about much more area.
G37 - 330 HP at 7000 rpm, 270 lb-ft torque at 5,200 rpm
G35 HR - 306 HP at 6,800 rpm, 268 lb-ft of torque at 4,800 rpm
Simple math says that at 7,000 rpm, the G37 is putting out 248 lb-ft of torque. At 6,800 rpm, the G35 us putting out 237 lb-ft of torque.
Both engines have pretty flat curves up to their torque peak. Above that 5,000 rpm, at best case scenario, the G37 is only putting out 10 more lb-ft of torque from 5,000 rpm to 7,000 rpm. based on the above math using just their ratings The G35 HR engine doesn't fall off that much (from a peak of 268 to 237 at roughly 7,000 rpm) which is similar to the G37. Above 7,000 rpm, they both drop off as that is beyond both cars horsepower peaks. Those 10 lb-ft of torque that the G37 has over the G35 HR engine is not enough to make a noticeable difference in performance, especially if some weight was gained.
The 7AT is a different story for the reasons mentioned already. Persoanlly, I don't think it matters - the G35 is already a quick enough car, so any improvement to the G37 is icing on the cake.
G37 - 330 HP at 7000 rpm, 270 lb-ft torque at 5,200 rpm
G35 HR - 306 HP at 6,800 rpm, 268 lb-ft of torque at 4,800 rpm
Simple math says that at 7,000 rpm, the G37 is putting out 248 lb-ft of torque. At 6,800 rpm, the G35 us putting out 237 lb-ft of torque.
Both engines have pretty flat curves up to their torque peak. Above that 5,000 rpm, at best case scenario, the G37 is only putting out 10 more lb-ft of torque from 5,000 rpm to 7,000 rpm. based on the above math using just their ratings The G35 HR engine doesn't fall off that much (from a peak of 268 to 237 at roughly 7,000 rpm) which is similar to the G37. Above 7,000 rpm, they both drop off as that is beyond both cars horsepower peaks. Those 10 lb-ft of torque that the G37 has over the G35 HR engine is not enough to make a noticeable difference in performance, especially if some weight was gained.
The 7AT is a different story for the reasons mentioned already. Persoanlly, I don't think it matters - the G35 is already a quick enough car, so any improvement to the G37 is icing on the cake.
The torque curve begins to drop at about 6000, and the horsepower maintains about the same figure from 6000 to redline.
WRC cars create about 300hp, but they'll SMOKE any 300hp car of similar weight. Why? Because they make 300hp for a 2500-3000 rpm band.
The VQ37VHR does the same in that it creates that 330hp for about 1600 rpms.
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Originally Posted by Mike@RiversideInfiniti
You're talking about numbers on paper, I'm talking about numbers put to the ground on an actual production car.
The torque curve begins to drop at about 6000, and the horsepower maintains about the same figure from 6000 to redline.
WRC cars create about 300hp, but they'll SMOKE any 300hp car of similar weight. Why? Because they make 300hp for a 2500-3000 rpm band.
The VQ37VHR does the same in that it creates that 330hp for about 1600 rpms.
The torque curve begins to drop at about 6000, and the horsepower maintains about the same figure from 6000 to redline.
WRC cars create about 300hp, but they'll SMOKE any 300hp car of similar weight. Why? Because they make 300hp for a 2500-3000 rpm band.
The VQ37VHR does the same in that it creates that 330hp for about 1600 rpms.
The G37 does not have the same HP from 6000 rpm to redline. Please show proof of that. The curve that I have seen has HP rising continuously and then flattening out after 7,000 rpm. At 330 Engine HP, the G37 engine would be putting out 290 lb-ft of torque at 6,000 rpm if the HP was 330, which we know it does not. The actual dyno curves that I have seen for the G37 show a max torque of about 233 at 5,000ish rpm, 225ish at 6,000 rpm, 212ish at 7,000 rpm, and 200ish at redline. Those numbers are expected from engine numbers as rated on paper at 270 lb-ft torque.
The dyno curves between these 2 cars is almost identical from idle to 5,000 rpm. From there to 7,000 the G37's engine is only putting out 10 more lb-ft of torque. Redline is 600 more rpm away. From dyno curves I've seen, it looks like the G35 engine does drop off from 7,000 to 7,600 rpm, so the G37 engine has an advantage in that last 600 rpm. The way I see it, there is a slight advantage (10 lb-ft) ON PAPER for a couple of 1000 rpm (5000-7000) which is erased by any weight gain (the 2 torque curves I have seen show the torque to be the same at 7,000 rpm so this advantage may not even be there). The only real advantage is that last 600 rpm.
Constant horsepower is not what you want, it's constant torque. Constant horsepower above 5,252 rpm means you're torque is dropping - not a good thing. Most engines do this anyway at higher rpm, but it's a matter of relativity. I guess a constant horspower figure is better than a dropping one, but what you really want to see is a flat torque curve for as long as possible.
Anyway, I am considering the G37 Sedan 6MT regardless of whether it is faster or not. I just don't expect more than a .1 second improvement in performance for the 6AT (13.8ish 1/4 mile). We'll see soon enough. My money is on the 7AT being faster than the 6MT by a couple of tenths.
Sorry for winded posts.
Last edited by trey100; Oct 12, 2008 at 07:53 AM.
Originally Posted by trey100
I dont' want to seem argumentative, so please don't take it that way.
The G37 does not have the same HP from 6000 rpm to redline. Please show proof of that. The curve that I have seen has HP rising continuously and then flattening out after 7,000 rpm. At 330 Engine HP, the G37 engine would be putting out 290 lb-ft of torque at 6,000 rpm if the HP was 330, which we know it does not. The actual dyno curves that I have seen for the G37 show a max torque of about 233 at 5,000ish rpm, 225ish at 6,000 rpm, 212ish at 7,000 rpm, and 200ish at redline. Those numbers are expected from engine numbers as rated on paper at 270 lb-ft torque.
The dyno curves between these 2 cars is almost identical from idle to 5,000 rpm. From there to 7,000 the G37's engine is only putting out 10 more lb-ft of torque. Redline is 600 more rpm away. From dyno curves I've seen, it looks like the G35 engine does drop off from 7,000 to 7,600 rpm, so the G37 engine has an advantage in that last 600 rpm. The way I see it, there is a slight advantage (10 lb-ft) ON PAPER for a couple of 1000 rpm (5000-7000) which is erased by any weight gain (the 2 torque curves I have seen show the torque to be the same at 7,000 rpm so this advantage may not even be there). The only real advantage is that last 600 rpm.
Constant horsepower is not what you want, it's constant torque. Constant horsepower above 5,252 rpm means you're torque is dropping - not a good thing. Most engines do this anyway at higher rpm, but it's a matter of relativity. I guess a constant horspower figure is better than a dropping one, but what you really want to see is a flat torque curve for as long as possible.
Anyway, I am considering the G37 Sedan 6MT regardless of whether it is faster or not. I just don't expect more than a .1 second improvement in performance for the 6AT (13.8ish 1/4 mile). We'll see soon enough. My money is on the 7AT being faster than the 6MT by a couple of tenths.
Sorry for winded posts.
The G37 does not have the same HP from 6000 rpm to redline. Please show proof of that. The curve that I have seen has HP rising continuously and then flattening out after 7,000 rpm. At 330 Engine HP, the G37 engine would be putting out 290 lb-ft of torque at 6,000 rpm if the HP was 330, which we know it does not. The actual dyno curves that I have seen for the G37 show a max torque of about 233 at 5,000ish rpm, 225ish at 6,000 rpm, 212ish at 7,000 rpm, and 200ish at redline. Those numbers are expected from engine numbers as rated on paper at 270 lb-ft torque.
The dyno curves between these 2 cars is almost identical from idle to 5,000 rpm. From there to 7,000 the G37's engine is only putting out 10 more lb-ft of torque. Redline is 600 more rpm away. From dyno curves I've seen, it looks like the G35 engine does drop off from 7,000 to 7,600 rpm, so the G37 engine has an advantage in that last 600 rpm. The way I see it, there is a slight advantage (10 lb-ft) ON PAPER for a couple of 1000 rpm (5000-7000) which is erased by any weight gain (the 2 torque curves I have seen show the torque to be the same at 7,000 rpm so this advantage may not even be there). The only real advantage is that last 600 rpm.
Constant horsepower is not what you want, it's constant torque. Constant horsepower above 5,252 rpm means you're torque is dropping - not a good thing. Most engines do this anyway at higher rpm, but it's a matter of relativity. I guess a constant horspower figure is better than a dropping one, but what you really want to see is a flat torque curve for as long as possible.
Anyway, I am considering the G37 Sedan 6MT regardless of whether it is faster or not. I just don't expect more than a .1 second improvement in performance for the 6AT (13.8ish 1/4 mile). We'll see soon enough. My money is on the 7AT being faster than the 6MT by a couple of tenths.
Sorry for winded posts.
Originally Posted by Wannabe6MT
My head is spinning from this guys posts...
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There's no way stock G37 sedan can match stock 08 or 09 335i in performance wise. The new 7 speed transmission can make g37 sedan couple tenth quick but it still cannot beat twin turbo 335i (300 foot-lbs/ 1400 rpm)
Hotlinked a photo, actual car.
Before and after dyno; this car does have a few mods, and the power continues to climb on the 'after' graph. You can see the plateau starting in the upper 6's on this car.
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Originally Posted by G37USR
Hey, would the awd g37sedan make 0-60 in still 5secs. Or will it be quicker cuz of more traction? Or will it be a little slower becuase of more weight?