How Fast... - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 05-12-2013, 05:50 PM Thread Starter
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How Fast...

How fast can you go in 4WD on dry pavement...? Obviously in a straight line!



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post #2 of 8 Old 05-12-2013, 06:09 PM
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Do you have the shifter in the floor or ESOF 4wd? If you have ESOF (the switch on the dash) and are asking with regards to a boosted launch while drag racing, I launch and then flip the switch back to 2wd, on the gear change, the truck is usually able to drop out of 4 and back to 2wd.

That being said, I wouldn;t go any faster than needed in 4hi, but some guys run 4wd for there entire 1/4 mile pass at the track. I personally would go over about 30-40mph and thats on a rare occasion

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post #3 of 8 Old 05-12-2013, 06:14 PM Thread Starter
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Quote:
Originally Posted by 05_PSD_Erik View Post
Do you have the shifter in the floor or ESOF 4wd? If you have ESOF (the switch on the dash) and are asking with regards to a boosted launch while drag racing, I launch and then flip the switch back to 2wd, on the gear change, the truck is usually able to drop out of 4 and back to 2wd.

That being said, I wouldn;t go any faster than needed in 4hi, but some guys run 4wd for there entire 1/4 mile pass at the track. I personally would go over about 30-40mph and thats on a rare occasion
Aha... Just might be the answer I was looking for... Didn't think you could get it out of 4WD on the boost.... even if under the speed requirement...

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post #4 of 8 Old 05-12-2013, 07:18 PM
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Ford says you can shift to and from 4wd up to 55mph the 4wd will be fine to 100


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post #5 of 8 Old 05-12-2013, 07:18 PM
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I'm NO expert, but I have broke everything at least once...LOL. I have run my truck in 4x4 with boosted (Low boost) launches and stayed in it the whole 1/4 mile. I have done it several times with no problems. I would be more afraid of trying to switch back to 2 wheel drive at those speeds with a load. I think it is safe to say that you can break stuff no matter what when racing.

I'm curious to hear what others think and do as well.

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post #6 of 8 Old 05-13-2013, 12:14 AM Thread Starter
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Originally Posted by turbo kidd View Post
I think it is safe to say that you can break stuff no matter what when racing.

True words!

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post #7 of 8 Old 05-13-2013, 06:38 AM
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Quote:
Originally Posted by turbo kidd View Post
I'm NO expert, but I have broke everything at least once...LOL. I have run my truck in 4x4 with boosted (Low boost) launches and stayed in it the whole 1/4 mile. I have done it several times with no problems. I would be more afraid of trying to switch back to 2 wheel drive at those speeds with a load. I think it is safe to say that you can break stuff no matter what when racing.
I'm curious to hear what others think and do as well.
I have never done a 4X4 boosted launch but this is what i would do as well ^^.

Boy isnt that the truth!

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post #8 of 8 Old 05-13-2013, 06:40 AM
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I thought I read something funny somewhere about the front driveline maybe unlocking at high speeds? I know it sounds odd but I swear I read it somewhere on the forums...seems illogical but who knows, I'm not an expert on that particular area of the truck haha

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