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Author Topic: Shut down procedures---  (Read 5104 times)

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Offline Roadster943

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Shut down procedures---
« on: March 20, 2008, 02:21:34 AM »
 I have 12 degrees in my roadster, dropped tube axel, 202mph, drives and slows down great.

  This just brought up a question. I have been told a lot that roadsters get unsettled when they nose over or when you lift at the end. Mine has never done anything like this. When I lift at the end of a run I could take my hand off the wheel and it would go straight I believe. Does anybody know what might make this happen or not happen?  Vince
« Last Edit: March 20, 2008, 09:44:20 AM by SPARKY »
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Offline SPARKY

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Shut down procedure
« Reply #1 on: March 20, 2008, 09:42:07 AM »
Vince,  I think this deserves its own topic---great question!!!!!!!!!!!!!
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Offline Glen

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Re: Shut down procedures---
« Reply #2 on: March 20, 2008, 10:05:07 AM »
In the last 25 years in the timing stand I have seen more roadsters spin all along the courses. Everyone is different but the one that seems to happen a lot is getting off the throttle quick and on the brakes. The best is to drive into the chute to keep the car stabilized during the shut down and weight transfer forward. It's also easy to over steer the car when losing traction and going into a spin. This happens a lot. Every event provides us with different track conditions and looking at the course is a good idea. At the dry lakes this is easy to do on Saturday, at Bonneville after the drivers meeting they will escort everyone down the courses to see the lay out. :-D
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Offline Stainless1

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Re: Shut down procedures---
« Reply #3 on: March 20, 2008, 10:12:37 AM »
In the last 25 years in the timing stand I have seen more roadsters spin all along the courses. Everyone is different but the one that seems to happen a lot is getting off the throttle quick and on the brakes. The best is to drive into the chute to keep the car stabilized during the shut down and weight transfer forward. It's also easy to over steer the car when losing traction and going into a spin. This happens a lot. Every event provides us with different track conditions and looking at the course is a good idea. At the dry lakes this is easy to do on Saturday, at Bonneville after the drivers meeting they will escort everyone down the courses to see the lay out. :-D

We are with Glen, power till the chute tug, then ease off the throttle.  Only time this gets you in trouble is when the chute doesn't come out and it takes you 10 to 15 seconds to figure out it ain't coming out even with the manual release.  The course guys see you stay under power past the 5, then Lee visits with you....  :-o   :|
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Offline fredvance

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Re: Shut down procedures---
« Reply #4 on: March 20, 2008, 10:17:59 AM »
Is the drivers meeting the essentially the same every day? My reservations are for tuesday on, I am trying to get something going earlier.I am afraid that if I miss the monday meeting I might miss something. Needless to say I am  rookie.  Fred
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Offline Sumner

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Re: Shut down procedures---
« Reply #5 on: March 20, 2008, 11:03:55 AM »
Might also depend on the gearing and engine braking.  If you get past the mile and don't have the chute (drive into like Glen mentioned), haven't pushed the clutch in and just dump the gas pedal and have a lot of engine braking with your combo it is going to be just like throwing the brakes on to some extent.  I had a lot of practice with all of these scenarios driving in Wyoming winters for 30 years.  You can go fast, but don't do anything fast to upset the car.

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Offline Glen

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Re: Shut down procedures---
« Reply #6 on: March 20, 2008, 11:30:20 AM »
Fred
The drivers meetings are pretty much the same. They have a couple of meetings for the late comers as well.
Glen
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Offline maguromic

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Re: Shut down procedures---
« Reply #7 on: March 20, 2008, 11:31:57 AM »
Sum, With a lot of cars running clutch-less air shifted transmissions, it is impossible to down shift in most cases to use the engine as a brake, and they must also maintain a load on the transmission or it will automatically pop into neutral.  What is perceived, as a being on the gas by the course guys may be a situation where the transmission has popped into neutral and all that is left are the brakes. 

I applaud the SCTA for trying to make the markers easier to see and mandating a drive through for rookie orientation.
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Offline Sumner

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Re: Shut down procedures---
« Reply #8 on: March 20, 2008, 12:18:27 PM »
Sum,...... and they must also maintain a load on the transmission or it will automatically pop into neutral........

The newest transmission in Hooley's Stude is a G-Force and we had the option of a drag type like you mentioned that can pop into neutral or the non-drag type.  We chose the latter for just the reason you mentioned.  With a high power car or almost any car you can get into and out of the gas on the run and we didn't want Hooley having to hold it in gear.  It has been a great choice. 

Last year after our first day fiasco that resulted in 4 days of work before we could run again we got close to finally starting and found out a couple cars back that the clutch wasn't working.  Well it was working you just couldn't disengage it with the peddle.  It looked non-fixable at least in line so we went ahead and ran.  Hooley left it in neutral and I pushed him to about 60 mph and there he pulled it into gear and pulled away and made the rest of the shifts without the clutch and popped it into neutral once the chute was out.  It was good enough to get us in impound.  We did the same thing the next day and all was good until the car broke loose and started to spin and he had to pull the chute and the chance at a new record was put on hold until this year  :cry:.

http://www.youtube.com/watch?v=uSrGmZC2M1M&eurl=

Listen for the 2-3 shift about the one mile and the shift into 4th about the 2 1/4 mile.  3rd is 1 to 1 and 4th is just a 7% overdrive.  Then you can hear him pop it out of gear after the chute is out.

The point I was trying to make in the other post is that some, not all, cars have enough engine braking even in 4th gear that if you get out of the gas to quick you can get enough engine braking to upset the car, guess I didn't do a very good job.

c ya,

Sum
« Last Edit: March 20, 2008, 01:47:48 PM by Sumner »

Offline maguromic

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Re: Shut down procedures---
« Reply #9 on: March 20, 2008, 12:53:45 PM »
Sum, I agree with you.  I was just bringing up a point about those transmissions.  I have a air shifted liberty box for my roadster and I will have to deal with this problem.
« Last Edit: March 20, 2008, 12:57:14 PM by maguromic »
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Offline doug odom

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Re: Shut down procedures---
« Reply #10 on: March 21, 2008, 12:15:10 AM »
Our Liberty does not "pop" in neutral but it is " Free Wheeling" like the old time overdrives. As long as the car is going faster than the motor it feels like neutral. But it still is in what ever gear you are in. Pick up the RPM and you will drive away.   Doug Odom in big ditch
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Offline maguromic

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Re: Shut down procedures---
« Reply #11 on: March 21, 2008, 12:31:25 AM »
Doug, You are correct, I explained it wrong! Bad choice (pop into neutral) of words.
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Offline Sumner

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Re: Shut down procedures---
« Reply #12 on: March 21, 2008, 09:13:13 AM »
Our Liberty does not "pop" in neutral but it is " Free Wheeling" like the old time overdrives. As long as the car is going faster than the motor it feels like neutral. But it still is in what ever gear you are in. Pick up the RPM and you will drive away.   Doug Odom in big ditch

The Liberty might not do that, but you can get some of the drag setups like would have been available for our G-Force that do pop into neutral and are intended to do so at the drags.  Is your liberty a planetary style.  Ours isn't.

Good info though for people to consider when picking a transmission,

Sum