BMW's new inline 6's are insane. The S5/RS5 really need a power bump
12-04-2019, 11:41 AM
#112
On torque and HP:
It's not just the peak torque number that matters. It's how much and how long torque can be sustained along an engine's rev band.
If an engine has a "peaky" engine it could have a peak torque of 300lb ft, but it only hits that peak for 200rpm, and has a steep climb off idle to peak and then a sharp drop to red line.
That engine wouldn't feel and perform as powerfully as an engine that has a peak torque of 280lb ft. but achieves 80% of that from 400rpm off idle and sustains that torque for 3000rpm, hits the peak at 4500rpm and then slowly levels off to 80% again to near red line.
An engine that can produce a good amount/percentage of its power along a wide rev range will move a vehicle from standing start to high speed more quickly compared to a peaky engine that produces a higher peak torque, but for a very short duration.
Of course, proper trans gearing is what transfers that power to the wheels, and the tires ability to grip the road surface is what puts the power into motion.
Torque is force, and "Horse Power" is calculated from Torque.
Here's a good read for anyone interested in torque and HP:
Power and Torque: Understanding the Relationship Between the Two, by EPI Inc.
It's not just the peak torque number that matters. It's how much and how long torque can be sustained along an engine's rev band.
If an engine has a "peaky" engine it could have a peak torque of 300lb ft, but it only hits that peak for 200rpm, and has a steep climb off idle to peak and then a sharp drop to red line.
That engine wouldn't feel and perform as powerfully as an engine that has a peak torque of 280lb ft. but achieves 80% of that from 400rpm off idle and sustains that torque for 3000rpm, hits the peak at 4500rpm and then slowly levels off to 80% again to near red line.
An engine that can produce a good amount/percentage of its power along a wide rev range will move a vehicle from standing start to high speed more quickly compared to a peaky engine that produces a higher peak torque, but for a very short duration.
Of course, proper trans gearing is what transfers that power to the wheels, and the tires ability to grip the road surface is what puts the power into motion.
Torque is force, and "Horse Power" is calculated from Torque.
Here's a good read for anyone interested in torque and HP:
Power and Torque: Understanding the Relationship Between the Two, by EPI Inc.
Last edited by TT-S4; 12-04-2019 at 12:02 PM.
12-04-2019, 02:50 PM
#113
AudiWorld Senior Member
While power can be calculated using torque, this doesn't make it more important. I mean, I can apply more torque (using a few feet wrench) than my engine. That doesn't mean I can accelerated my car very fast! The important thing is how fast you can apply that torque and this is power!
Last edited by Yoshimura; 12-04-2019 at 02:52 PM.
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JD15 (12-04-2019)
12-04-2019, 03:11 PM
#114
While power can be calculated using torque, this doesn't make it more important. I mean, I can apply more torque (using a few feet wrench) than my engine. That doesn't mean I can accelerated my car very fast! The important thing is how fast you can apply that torque and this is power!
Horse power is calculated from torque, not "can be", it is. Torque doesn't come from horse power. Without force, which is torque, there is no horse power.
BTW, that wasn't the main point of my comments. And again, I can't address your assertion of "more important" as I don't know who or what you're referencing.
Last edited by TT-S4; 12-04-2019 at 03:15 PM.
12-04-2019, 05:09 PM
#115
AudiWorld Senior Member
12-04-2019, 06:49 PM
#116
Permanent S Mode Member
12-04-2019, 08:13 PM
#117
AudiWorld Senior Member
By the way, converting thrust to horsepower make no sense. It would be like trying to convert miles to pounds. They are different physical quantities.
12-11-2019, 05:30 AM
#118
I'm still waiting to see what APR does with their tune for the rs5, but the M already seems to have some good tuning options.
12-11-2019, 06:19 AM
#119
AudiWorld Member
Thread Starter
12-11-2019, 01:31 PM
#120