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Whats your top speed in your 12v cummins ? mine is 80mph, (4.10 gears, bullydog 4inch turboback, S&B cold air intake) :party018:
 

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Discussion Starter #4
they are stock big deezul, and v8440 120 jeezez, is my 80mpg normal lol?
 

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they are stock big deezul, and v8440 120 jeezez, is my 80mpg normal lol?
What are you saying? Get the sh!t outta your mouth!

Never have never hit top speed in my truck, got 3.54's and 5k governor springs, im thinking its gonna be over 120, but that really gonna wind her out
 

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I would say 80 mph sounds about right for stock governor springs and 4.10's. Remember, mine will turn a little past 3000, and it has 3.54's. Any truck with 3.54's and normal size tires will go that fast at 3000 rpm. Taller tires would have you going faster, but the speedometer would still read about 120. Shorter tires have you going slower, but again, the speedometer would read the same as it did with stock tires.
 

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Never have never hit top speed in my truck, got 3.54's and 5k governor springs, im thinking its gonna be over 120, but that really gonna wind her out
Holy crap! I did the division for mph vs rpm, and in 5th gear with 3.54's, each mph of speed requires 25 rpm. Plugging that in to the equation, we get 5000 divided by 25-the result is 200 mph! I doubt any of our trucks would make enough power to overcome wind drag at that speed, but if wind drag was not a factor, you should actually hit about 200 mph at 5000 rpm.
 

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100mph with 4ks only got to 3000rpm then it got really hot like 1800 egt
 

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Truck in sig I have hit 90 mph and could have picked up another 5-10 mph?
 

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'Bout 105-110. 3.54, 35"s, 3200. The wife asked if my water pump going bad had anything to do with it. "Oh no, honey. They just wear out." :rof
 

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before the 4k gsk i would only be able to do about 78-79 and 81-82 down hill with a little wind in my favor
 

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I've let off around 100 and it still had a bunch more in it. These tires aren't exactly intended for that kind of driving and it didn't feel especially stable.
 

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I think he called him a dumbass for being a dickhead about it, but I could be mistaken.
 

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OMG snookie.. He was like.. totally calling you a dumbass.. and like.. Said go Eff yourself... I mean, who does that? Seriously? Eww.
 
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