Freak Accident (pegged speedo)! - TCCoA Forums
 
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post #1 of 15 (permalink) Old 12-17-2003, 02:22 PM Thread Starter
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Freak Accident (pegged speedo)!

Well the other day there was like 4-5 in. of snow down (streets covered) and I happened to turn onto a brick street that has an incline. And well I have 2 bald rear tires (due to limited slip...hehe) and had a HARD time getting up the street. I had two buddies in the car with me so I kinda showed off a little and give it some throttle (maybe half or 3/4's) and my buddy in the passenger seat starts saying look, look and turns down the music real quick (it was up kinda loud) to bring to my attention that am I am pegged out. Both of my friends are well aware of the dangers of going past 105 without the proper upgrades. So I let go real quick and thanked god nothing broke. The speedo needle was litteraly bouncing past 120 and I beleive I was at like 5300 rpms in third gear. I am well aware of what could of happened and that it was stupid. But I never imagined the speed jumping that high so quick!

Man was I lucky!

So here are my questions:

Being that I was probably traveling only about 15mph, do the same dangers (drive shaft, TC, tires, etc) still occur since the vehicle does not have the same inertia as traveling at 130mph?

How fast was the tires spinning if I was at 5300 rpms in 3rd with 3.27's?

Thanks!

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post #2 of 15 (permalink) Old 12-17-2003, 02:34 PM
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thats what rev limiters are for.

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post #3 of 15 (permalink) Old 12-17-2003, 02:35 PM
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IMHO, yep.

The issue with all the items you listed things are the RPM’s (except the tires which are usually long term, heat related with a load)

Although, without a heavy load, it probability isn't "as bad".

It’s not as bad as driving on bald tires in 4 inches of snow….

Tire speed = 1620 rpm. (5300 / 3.27 assuming 3rd is 1:1.)

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post #4 of 15 (permalink) Old 12-17-2003, 02:37 PM
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Though I can't say with certainty, I would guess that if your speedo and tach said your drivetrain was going over 120, the same priciples apply, (Centrifugal forces on all spinning parts). As the car wasn't going 120, then the principles of physics still apply, (object in motion tends to remain in motion, object at rest tends to remain at rest, etc) So I guess what I am saying is that, yes it is probably a very good idea that you shut down when you did as the driveshaft was turning as if it was going 120, as well as all other drivetrain parts. Have I helped? or just confused? Anyone else?


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post #5 of 15 (permalink) Old 12-17-2003, 03:45 PM
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and if it was an open rear end car, wasn't the tire that was spinning going close to twice as fast as indicated??

I know back when I was stupider (like 20 years ago) I did that with a Ford LTD on wet pavement....................the speedo hit 80 and one of the rear tires went BOOOOM!!!

I'm quite sure dad didn't really believe me when I said I was just driving around a corner and it went!! but he never took it any farther.
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post #6 of 15 (permalink) Old 12-17-2003, 05:41 PM
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did that in my buddys "V6" mustang....he dont care about the car, and we were having a blast........till the tire got off the ice and hit perfectly dry pavement...

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post #7 of 15 (permalink) Old 12-17-2003, 08:16 PM Thread Starter
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Quote:
Originally posted by 94 Daily Driven 4.6L
IMHO, yep.

The issue with all the items you listed things are the RPM’s (except the tires which are usually long term, heat related with a load)

Although, without a heavy load, it probability isn't "as bad".

It’s not as bad as driving on bald tires in 4 inches of snow….

Tire speed = 1620 rpm. (5300 / 3.27 assuming 3rd is 1:1.)
Yeah, driving in snow with bald tires (I mean BALD) , Limited Slip, NO ABS and NO traction control is tuff!

LOL, but I am used to it now. I actually think it is somewhat "scarier" to drive in the rain with bald tires and at normal driving speeds since you aren't always sliding like in the snow but then out of nowhere one will catch you by surprise around a turn with slightly to much throtle.

Any way's I kinda asked the wrong question, what I meant was how many MPH since the speedo was pegged? I ask that because it bounced a few times before I let go...


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post #8 of 15 (permalink) Old 12-18-2003, 03:07 PM
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Quote:
Originally posted by mamberg
and if it was an open rear end car, wasn't the tire that was spinning going close to twice as fast as indicated??
No. Same speed.




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post #9 of 15 (permalink) Old 12-18-2003, 04:13 PM
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are you sure about that??? I know with the driveshaft stationary, (and the car on a lift) when you move one wheel forwards, the other wheel turns backwards.

If you held one wheel stationary, and moved the driveshaft, wouildn't the other wheel turn twice as fast as if both wheels were turning???

I don't know, I was told this long ago. Anybody else chime in????

I'll see if I can go find any other info.
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post #10 of 15 (permalink) Old 12-18-2003, 06:44 PM
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In an open rear end, yes, it would be close to double the speed. However he said IN HIS FIRST POST that he had a limited slip. So NO in this case it was NOT going 200MPH.

Geez people. This is exactly what Kris was ranting about. READ THE POSTS. Quit jumping to assumptions.

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post #11 of 15 (permalink) Old 12-18-2003, 09:11 PM
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SW, I believe mamberg was making an off-topic comment.

I fail to see how one tire could spin any faster. The power is transferred through one axle instead of two. one is turning at actual vehicle speed, the other at the driveline speed. While there is not a connection between halfshafts, there is still a mechanical connection between the driveshaft and the halfshaft associated with the tire with less traction.




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post #12 of 15 (permalink) Old 12-18-2003, 11:43 PM
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Greenbird, it most certainly could travel MUCH faster. If you have an open differential and stop one wheel, the opposite wheel will instantly turn twice as fast as previously given the same driveshaft rpm input.

The pinion turns the carrier, not the axles. In normal operation, the spider gears don't turn at all because both wheels are traveling at the same speed. However in a tight turn, the inside wheel slows down and the outside wheel speeds up. But the speedometer does not change. At that point, the spider gears are turning a bit. Then if you stop one wheel, the spider gears start turning which in turn spin the free axle faster. Precisely TWICE as fast as the turning carrier.

So if it had been a one-legger and he'd buried the speedo, that one wheel would have gone to nearly 200MPH. It wouldn't be 240 because the other wheel would still have *some* forward movement. That's a sure way to pop a tire as has been mentioned already.

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post #13 of 15 (permalink) Old 12-19-2003, 08:15 AM
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Thanks for your comments guys. I WAS just making a related comment and I admit I did blow past his 'due to limited slip' part of the post.

My apologies for taking this off-topic.
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post #14 of 15 (permalink) Old 01-30-2004, 08:02 PM
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I had no engine trouble with my car 1990 tbird 3.8L N/A and it has 184 000 KM and i drive kinda hard and been to 110mph a few times. I also dont have a tach so i dont know what i was at.
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post #15 of 15 (permalink) Old 01-31-2004, 03:54 PM
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That is bad for the transmission. You can overheat it easily when you get stuck in snow or ice. Our transmissions run hot enough. Keep an eye on your fluid.
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