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Posted: 10/25/2010 5:18:12 PM EST
How are they done on manuals? Is it normal shifting from a cleanish start? Or are revs built up and is it powershifted up there? Just curious, thanks in advance guys.
Link Posted: 10/25/2010 5:24:06 PM EST
[#1]
Depends on who does the testing....whatever gets the fastest time is usually most common I believe.
Link Posted: 10/25/2010 5:39:35 PM EST
[#2]
on a stock car with stock tires you probably have to feather the clutch in 1st a bit or else you will either bog it or spin the tires.  Might have to short shift into 2nd gear (shifting before redline) so that the tires don't spin too much in 2nd gear, then if you have enough ride it out to redline in 2nd or shift to 3rd if you have to.  Power shifting will be best from 2-3
Link Posted: 10/25/2010 5:40:28 PM EST
[#3]
It does depend on the vehicle and how much power it has, tires, etc. etc.
But you would never start like you do driving. You'd at least prop it up a couple grand or else your 60' times would be terrible.
Link Posted: 10/27/2010 5:48:26 AM EST
[#4]
Damn I'm retarded, I was asking how car makers got their times.
Link Posted: 10/28/2010 5:24:01 AM EST
[#5]
With a good driver, in stock trim, on a good tarmac would be my guess.



There are so many factors in a 0-60 time that getting whatever the factory said is possible may require a good bit of practice and proper conditions. Things like elevation and driver weight could effect it enough to prevent getting the same 0-60 time.

Link Posted: 10/28/2010 6:26:34 AM EST
[#6]
Quoted:
Damn I'm retarded, I was asking how car makers got their times.


Here's one test procedure. It's very much a trial-and-error process to get the best times (spin vs. bog). These are usually measured by some GPS based data acquisition system, like the Racelogic VBOX. Typically you keep 1/4 tank or less in the car.

-Rev to 3krpm, hold steady.
-Feed in more throttle as the clutch is released. Aim for some, but little wheelspin (this is how I'm most successful –– if you read a vehicle dynamics textbook, it'll probably say 10% wheelspin is best...at least that's what RCVD says).
-Foot to the floor (if possible).
-When shifting, speed is the name of the game. Clutch in, gas off, rip it to 2nd (I would never do this to my own car –– but for testing purposes, you want to just jerk that thing back RFN). Release clutch, full throttle. I think a good time would be in the 200ms range, but I'd have to check data/notes.
-Repeat to 3rd if necessary.

One interesting fact. You can be the Stig, follow this procedure (or even a better one) to a T, and you still wont match any car rag times. Depending on the outlet (some are far worse than others), they might give a few feet of rollout (this is almost always done on 1/4 mi times, but sometimes even done on 0-60 times), adjust for atmospheric conditions, etc.

ETA: As DarkCharisma said, these are usually done on a hot dry tarmac, typically a straightaway or VDA pad. It's also common to lay down some rubber for your launch area (this is one way to warm up your tires, but I would actually recommend driving in circles both directions first to get the interior of the tire hot). The numbers collected this way are typically NOT published and used for internal purposes. They're typically collected by (well-trained) engineers.
Link Posted: 10/28/2010 6:42:38 PM EST
[#7]
What you should pay attention to is not the 0-60 times, but the differential between the 0-60 times and the 5-60 times.  The 0-60 times reflect ideal starts with high-rev abuse to the transmisson, whereas 5-60 times reflect realistic acceleration with the clutch out and a stab to the floor with the gas.  If there is a big difference between the 0-60 and the 5-60 times, in that the 0-60 is much shorter, you can bet that to get such times they abused the shit out of the transmission.  Such examples are AWD performance cars like the Subaru WRX and the WRX STI.  It's not like I hate the Subaru's, it's just that their 0-60 claims do not reflect real world acceleration performance.
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