02-17-2015, 05:41 PM | #127 | |
Add lightness!
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02-17-2015, 05:43 PM | #128 |
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poor guy, hope you learn to learn someday
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02-17-2015, 05:57 PM | #129 |
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No mine is bigger!
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02-17-2015, 06:00 PM | #130 | |||||
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Oh.... and becasue the results would be the same! Spinning up the driveshaft consumes .28 horsepower regardless of what top speed you are shooting for! (as long as we are at max acceleration) Quote:
Well... you are as well. What does that mean? Quote:
Hmm... that's pretty much a standard metric in ALL performance automobile evaluations. I guess all those engineers who evaluate cars are stupid too. Quote:
WHY would I first start out to disprove a FACT? when I KNOW it to be a fact? WHY dont YOU try to prove that the moon doesnt exist? Quote:
Instead of comparing removing 15 lbs from the driveshaft to removing 15 pounds from someplace like.... the spare tire (something MOST of us do at the track ANYWAY!) I guess now I'll go compare shedding 15 pounds from the driveshaft to removing two pink flamingos from my yard. WHAT THE FUCK ARE YOU TALKING ABOUT?!?! Actually after typing all of this, it is clear that you are just trolling to get in on the action. Jealous? Need a hug? |
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02-17-2015, 06:06 PM | #131 |
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Well, you guys could just test it, ya know. Here's one way that cuts out most user error:
Put the car on stands, or at least raise the rear wheels. Go into first and rev to six thousand. Get your stopwatch ready. Now lift quickly while starting the timer. Click it off when the engine hits 1000rpm. Then install the new drive shaft. Repeat the process. Do them both in the same conditions and oil temperatures. You could also do it in different gears. Whatever way carries more mass will carry more momentum to defeat the friction and therefore will spin longer. I'd wonder if the drive shaft shop job is stronger. They claim up to 800hp. I've no idea what the stock shaft can handle. However, i did notice that the AL shaft is 3" and the stock is about 2 5/8.
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02-17-2015, 06:07 PM | #132 |
Add lightness!
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If what you say was truly the case, why does almost every single high performance front engine, rear wheel drive car have an aluminum or carbon fiber driveshaft? RX8, 350z, 370z, GTR, zo6, db8, amgs, bmw m cars, ETC ETC ETC ETC?
Maybe you should go tell all the OEMs they are wasting their time. |
02-17-2015, 06:10 PM | #133 | |
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02-17-2015, 06:14 PM | #134 | |
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He's said it again and again.. the overwhelming benefit of upgrading to a DSS or equiv. part is driveshaft strength over stock. The DSS shafts are a realized and noticable upgrade in that department hands down. You've listed vehicles with significantly higher price points and power outputs (sans RX8), and subsequently are more inclined to offer this peace of mind. You can continue to ignore sound math and perspectives, though, to make yourself feel better |
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02-17-2015, 06:17 PM | #135 | |
Add lightness!
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CFRP propeller shaft. The new BMW M3 Sedan and new BMW M4 Coupe also feature a CFRP propeller shaft. CFRP’s high rigidity and low weight mean that the drive shaft can be produced as a single-piece component without a centre bearing. This provides 40 per cent weight savings over the previous model, and the reduction in rotating masses results in sharper throttle response. The use of carbon in these models is a reminder that BMW is a global leader in high-strength, lightweight CFRP construction, and that it was BMW who brought out the first mass-production vehicle with a body consisting entirely of this material – the innovative BMW i3. |
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02-17-2015, 06:18 PM | #136 |
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LOL YOU'RE QUOTING BMW'S MARKETING DIRECTLY HAHAHAHAHAAHAHH
Such a troll... |
02-17-2015, 06:43 PM | #137 | |
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Since we are talking about the driveshaft not the engine (a fact missed by some on this thread), it is coupled to the ground via the final drive gear & the wheels. It doesnt spin up & down or ever get "uncoupled" from the wheels. When the car accelerates the driveshaft goes from 0 RPM to ~5560 RPM when the car hits ~100 MPH. (numbers werent meant to be exact) Again, the only reason I picked 0-100 MPH is that it is a standard metric and is a published #. |
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02-17-2015, 06:45 PM | #138 |
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Honestly, don't you smart arses have anything better to do? If you have so much free time, go do auto-x, skidpan or just drive your car 0-60mph, install one, repeat, then come back and tell us you can't notice the difference. Then go buy one of those yank V8's and drive it with 2 throttle positions. Don't waste people's time with irrelevant 100mph calculations. This is the next best thing after lighter wheels.
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02-17-2015, 06:49 PM | #139 | |
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You aussies and your nationalist profiling.. Yank v8s.. what does that even mean Did you even bother reading the evidence and math here? Just saying, this is NOT the next best thing after lighter wheels if you're looking for weight reduction. What's your basis for saying this? A lightweight battery would yield better results for FAR less money. Sorry bud.. math and logic prevails here. |
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02-17-2015, 06:50 PM | #140 |
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Anybody want to take bets on how long before this thread is locked? Anybody?
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