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Why the gently caress is that guy filming from the outside of a hairpin? Deathwish?
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Nov 20, 2015 01:50
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Everyone involved is completely retarded.
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Nov 20, 2015 05:52
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Dannywilson posted:Why the gently caress is that guy filming from the outside of a hairpin? Deathwish? Bro do you even Snake? I have better roads closer to me, but one nice morning I'm still planning on riding out to Malibu with my camera and setting up for an afternoon of watching rich throttlejockeys.
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Nov 20, 2015 06:13
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Hey I just got this Mustang lets put it on a dyno https://www.youtube.com/watch?v=lvVf8UZJCrU
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Nov 20, 2015 07:28
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Powershift posted:more like neverlift.mpg or "someguycutmeoffandtheni".mpg Just noticed from the description on Youtube : quote:"The driver claimed he slid on water."
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Nov 20, 2015 12:59
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Spiffness posted:It's here Lived up to expectations, loved the way they edited the three-way race off. The P1 throwing plumes of sparks as it bottoms out is just cool as balls. Turning thousand dollar race tires into smoke sure looks like a lot of fun.
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Nov 20, 2015 13:29
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Powershift posted:more like neverlift.mpg or "someguycutmeoffandtheni".mpg
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Nov 20, 2015 17:51
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leica posted:Hey I just got this Mustang lets put it on a dyno Never dyno'd a car before, but from all the videos I have seen you never need to shift since horsepower is tied to RPM and not gearing from what I understand. Is there some sort of top speed dyno test?
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Nov 20, 2015 18:20
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Spiffness posted:It's here Had an emotional response.
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Nov 20, 2015 20:21
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Alighieri posted:Never dyno'd a car before, but from all the videos I have seen you never need to shift since horsepower is tied to RPM and not gearing from what I understand. Is there some sort of top speed dyno test? You generally want to measure in top gear, since the engine moves through the rev range the slowest so you can get the best data resolution over time. With automatics though there's no way to go full throttle and not downshift unless it has a manual mode, so you just work your way through the gears and deal with only having data above the last shift point. Weird that the tire exploded, everything I can find says they're W-rated so they should have been fine at the 150mph the video claims. Maybe they lifted too fast and something something engine braking blah blah friction?
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Nov 20, 2015 20:29
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You definitely do not want to measure in top gear, otherwise tire/drivetrain speeds end up really high and you have poo poo like that happen. You can set most dynos to allow a set rate of acceleration in rpm/second which will work regardless of the gear or amount of power. Although usually you want to do it in 3rd-4th to limit wheel torque to something reasonable as there is a limit to what a dyno can handle.
jamal fucked around with this message at 20:49 on Nov 20, 2015 |
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Nov 20, 2015 20:42
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well i learned something today
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Nov 20, 2015 20:44
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Alighieri posted:Never dyno'd a car before, but from all the videos I have seen you never need to shift since horsepower is tied to RPM and not gearing from what I understand. Is there some sort of top speed dyno test? The way some dynos measure it, there could be a 10% different reading between 1.4:1 and 1:1, which is usually 3rd to 4th in a 5 speed, or 4th to 5th in a 6 speed. In general, you should really only compare directly a vehicle done twice on a different dyno. different cars tested on different dynos on different days could give wildly different numbers. If you look at the slow mo, his tires slowed down faster than the dyno roller causing it to bounce and catch and wobble. It's really always a risk when you have something spinning that fast, it terrifies me to see dyno videos with some dude standing inches from the rear roller in flip flops and shorts with a beer in his hand. https://www.youtube.com/watch?v=I9-_rElZzB4 That car hit 251 mph in the 1/4 mile. It's a 3 speed transmission and he was definitely in 3rd gear. If this happened to that car, everybody within a 3 block radius would be dead. https://www.youtube.com/watch?v=vEY3egPdcpY edit: why is every dyno explosion video either a mustang or a subaru?
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Nov 20, 2015 20:49
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Powershift posted:
Most dyno explosion ones I've seen are Commodores.
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Nov 20, 2015 23:27
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And that's why proper tiedown, dyno bearing maintenance, and not overpowering the dyno are important.
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Nov 20, 2015 23:29
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Dynos are all very well and fine if you're measuring the output of your cute little Power Wheels toys; this is how you measure REAL horsepower: https://www.youtube.com/watch?v=NrsPfXIFzSA (sorry for the soundtrack in advance)
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Nov 21, 2015 00:19
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MrChips posted:Dynos are all very well and fine if you're measuring the output of your cute little Power Wheels toys; this is how you measure REAL horsepower: Holy poo poo that's a lot of horsepowers.
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Nov 21, 2015 01:43
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MrChips posted:Dynos are all very well and fine if you're measuring the output of your cute little Power Wheels toys; this is how you measure REAL horsepower: Haha, this kicks rear end. I'm friends with Neal (guy at the and of the video). I'll have to mention this on fb. 11k. Jesus.
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Nov 21, 2015 03:27
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I was always under the impression that ideally you want to do dyno pulls in as close to a 1:1 gear as is available. Obviously sometimes uncooperative automatic transmissions or speed/torque limits of the dyno prevent this from being a viable option, but it seemed like that was a "if you can do it this way, you should" type thing. Is that not correct? Regarding the tire explosion run, I've seen quite a few videos on Youtube where people run their car up to top speed on a dyno, I guess to see how fast it could theoretically go if they didn't have that pesky aerodynamic drag to deal with. Maybe that's what they were doing?
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Nov 21, 2015 19:19
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Drifting a Tesla. https://www.youtube.com/watch?v=JOXDsUCZfgg
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Nov 24, 2015 00:37
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Winning lap from Superlap Battle last week: https://www.youtube.com/watch?v=i8nplfOqOjM 115mph and 2g through riverside, top speed of 146. Only a couple of time attack cars have ever gone faster, very impressive for a corvette with fairly mild aero compared to a lot of stuff.
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Nov 24, 2015 01:40
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MrChips posted:Dynos are all very well and fine if you're measuring the output of your cute little Power Wheels toys; this is how you measure REAL horsepower: Ive talked to some people trying to use those magnetic transducers. I have my doubts to their accuracy over all. Also taking noisy data like that and picking the top number seems suspect to me. Still impressive though.
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Nov 24, 2015 02:13
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wolrah posted:I was always under the impression that ideally you want to do dyno pulls in as close to a 1:1 gear as is available. Obviously sometimes uncooperative automatic transmissions or speed/torque limits of the dyno prevent this from being a viable option, but it seemed like that was a "if you can do it this way, you should" type thing. Is that not correct? You typically want the direct gear because it reduces transmission losses to a bare minimum (since direct gear is usually just a synchro connecting the input shaft to the output shaft and the gearing that drives the countershaft and all the mainshaft gears is just along for the ride) and gets you the most accurate dyno reading possible. Usually on a 4 or 5 speed manual that means 4th, with autos it really depends.
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Nov 24, 2015 16:36
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e- I was wrong about the stuff I said here Here is a video of the car I used to crew chief on the dyno: https://www.youtube.com/watch?v=bgudrRyXcyQ jamal fucked around with this message at 05:41 on Dec 12, 2015 |
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Nov 24, 2015 23:09
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Yeah input and output shafts do get locked together for direct drive, but it's just for convenience's sake; the other gearsets are still being spun (inertial load), still meshing with their freewheeling mate (friction load) and still being dragged through gear oil (more... well, not so much friction as fluid drag i guess).
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Nov 24, 2015 23:20
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If by "locked together' you mean engaged in the same way as every other gear in the transmission, then yeah. There's no special mechanism that is more efficient or anything like that.
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Nov 24, 2015 23:29
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Yeah no it's just another shift collar, just connects two shafts instead of a shaft and gear. I've seen inside manual boxes, I know how they work man. 
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Nov 24, 2015 23:34
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I know you're mostly a Subaru guy and Subaru 5MTs are wacko territory and don't work like what I said, so I'm not gonna be a dick, but all RWD/4x4 mantrans I've ever worked on (NV4500, NV3500, NV3550, AX15, AX5, AX4, SM420, NP435... etc) work how I said they do. The input shaft and output shaft are collinear in MOST such transmissions, so (for example, in an AX15) when you engage fourth gear, you're just sliding the 3-4 synchro collar forward over the 4th gear synchro stop ring onto the input shaft's rear end end, so it links the input and output shafts directly. And yes, like Enourmo and I said, the input shaft's drive gear, the whole countershaft, and the 1st/2nd/3rd/5th counter gears and such are all just along for the ride, but since they're under almost no load there's not really much parasitic load. I'll see if I can find a good video on youtube, actually, seeing as this is the youtube thread  e: here's a Toyota R150, which is the same thing as an AX15 in every way except the input shaft, output shaft, tailhousing, input bearing retainer, and shift turret. https://www.youtube.com/watch?v=vOo3TLgL0kM e2: 14:15 or so in is where 4th gear is covered. kastein fucked around with this message at 23:56 on Nov 24, 2015 |
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Nov 24, 2015 23:38
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And here's a video on how synchros actually do their job, since it's widely misunderstood: https://www.youtube.com/watch?v=MXsRfbOiBhE And here's how a crazyass folded-in-half Subaru 5MT works, which is why anyone who's used to Subarus and AWD Audis has a different worldview of the internals of a mantrans: https://www.youtube.com/watch?v=4Ca5Muoz1fs The front pinion gear shaft is actually INSIDE the output shaft. The input shaft is on top, all the gears drive down off it onto the output shaft (the outside layer of the lower shaft), which drives the housing of the center diff. The side-gear of the center diff that faces forward drives the front differential pinion gear directly through the center of the output shaft, while the rear side-gear of the center diff drives a set of helix gears that drive the rear output shaft of the transmission. e: It's kinda mindbending to me as a RWD/4x4 transmission nerd. Actually, really mindbending. It's also why Subarus don't have an exact direct gear - you should never design a gearset so the ratio is an integer since it'll wear the teeth unevenly (as each tooth always contacts the same 1, 2, 3, 4... teeth on the other mating gear) so Subaru "direct" gear doesn't link input to output directly, nor does it have a 1:1 ratio. e2: also note that the 1/2 synchro assembly is on the output shaft while the 3/4 synchro assembly and 5th synchro assembly are on the input shaft on the Subaru trans for packaging reasons. If they'd just put the 3-4 synchro assembly on the other shaft and left even a little bit of space between the 2nd and 3rd helix gears on the output shaft, you could build a girdle with bearings that would hold the input and output shafts together in the middle of that space, which would prevent shaft flexure way better than a case girdle and prevent the gears from going out of mesh under load and producing the well known 2nd and 3rd gear Subaru 5MT failure. kastein fucked around with this message at 00:16 on Nov 25, 2015 |
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Nov 25, 2015 00:05
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Am I missing something? the trans in your video has a gear driving another gear for 4th just like all the others. Although now that I am looking around I think I get what you are talking about. Makes sense. Compared to an evo/dsm box, Subarus are pretty straightfoward. On an evo etc, the center diff is in the transmission, and has the front and rear inputs both going out the same side (a hollow shaft with splines turning inside a bigger hollow shaft with splines). The inner/front output just drives a housing with spiders and a left and right output since it and the center diff are already being turned at the final drive ratio via the transfer gear in the transmission. To drive the front left wheel another shaft goes from the front diff back through the center diff and the the cv goes on the end of that. Then the rear output from the center diff turns a housing rotating outside of the front differential connected to a ring gear which turns a pinion, which turns the rear output, which goes to the rear diff. Oh, and then the active center diff mechanism is over on the other side of the transfer case and works to lock the front diff and rear transfer ring carrier thing together. jamal fucked around with this message at 06:28 on Nov 25, 2015 |
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Nov 25, 2015 01:17
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The guy isn't describing it well - the gearset right at the front isn't involved in 4th gear. Those two gears are how the countershaft gets driven. The gear on the input shaft next to 4th is permanently fixed to it (in fact it's machined into it), not being engaged by the synchro. I've been meaning to do an AX15 teardown/rebuild video for NAXJA, maybe I should do it soon. It's pretty obvious when you're holding the pieces in your hands what's going on, but the video can be confusing. e: this is all one piece of metal, the synchro cone is sometimes pressed on but the gear's integral and machined from the same forging as the rest of the shaft: 
kastein fucked around with this message at 16:07 on Nov 25, 2015 |
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Nov 25, 2015 16:03
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D C posted:Drifting a Tesla.
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Nov 25, 2015 16:10
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D C posted:Drifting a Tesla. Oh hey, that's in Odaiba. I was just there last month and got to see that track from the train. Nobody was running when I was going past but the pits were full, getting ready for something.
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Nov 27, 2015 00:18
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New roadkill is being uploaded, comeoooooooonnnnnnnnn.
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Nov 27, 2015 13:15
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Is this for the subscribers?
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Nov 27, 2015 13:19
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https://www.youtube.com/watch?v=XuHIemMF4kY here's the roadkill
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Nov 27, 2015 17:43
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scuz posted:https://www.youtube.com/watch?v=XuHIemMF4kY Mazdarody
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Nov 27, 2015 17:55
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"Remember that time we were in the Crusher Camaro on the freeway and you threw it into first at about 80?" "Naaaah....nah" "If you do that in this, it goes into park." KAPOW "She's quite a machine."
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Nov 27, 2015 18:15
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That u-joint 
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Nov 27, 2015 21:36
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Singing Journey on the Bay Bridge and a 454 w/ toronado transaxle in a mazda minitruck all in one episode. Incredible.
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Nov 28, 2015 07:56
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