12Vs TOP SPEED - Dodge Cummins Diesel Forum
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post #1 of 45 (permalink) Old 12-19-2010, 11:38 AM Thread Starter
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12Vs TOP SPEED

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

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post #2 of 45 (permalink) Old 12-19-2010, 11:46 AM
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do you have the stock governor springs?

97 club cab 4x4
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post #3 of 45 (permalink) Old 12-19-2010, 11:57 AM
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Mine is about 120 mph. This would be at a little over 3000 rpm, 3.54 gears.

'98 12v 2wd dually, SB DD, Detroit locker, 64/65/13 htb2, CPP 7x10's, 3kgsk, bhaf, 19*, 50 lbs boost
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post #4 of 45 (permalink) Old 12-19-2010, 12:44 PM Thread Starter
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they are stock big deezul, and v8440 120 jeezez, is my 80mpg normal lol?
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post #5 of 45 (permalink) Old 12-19-2010, 12:47 PM
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Originally Posted by ram2500saba View Post
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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post #6 of 45 (permalink) Old 12-19-2010, 12:48 PM
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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.

'98 12v 2wd dually, SB DD, Detroit locker, 64/65/13 htb2, CPP 7x10's, 3kgsk, bhaf, 19*, 50 lbs boost
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post #7 of 45 (permalink) Old 12-19-2010, 12:52 PM
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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.

'98 12v 2wd dually, SB DD, Detroit locker, 64/65/13 htb2, CPP 7x10's, 3kgsk, bhaf, 19*, 50 lbs boost
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post #8 of 45 (permalink) Old 12-19-2010, 01:02 PM
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if you can get it to 200, you've melted all 6 pistons haha. I've had mine up to 125.

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post #9 of 45 (permalink) Old 12-19-2010, 01:23 PM
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100mph with 4ks only got to 3000rpm then it got really hot like 1800 egt

1997 2500 NV4500, 2wd, BHAF, AFC mods, 4gsk w/60lb springs, No plate, boost and pyro gauges, delayed due to money pit(boat): 7x10's, hx35/ht3b compounds
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post #10 of 45 (permalink) Old 12-19-2010, 04:57 PM
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...come on guys, lets play nice.
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post #11 of 45 (permalink) Old 12-19-2010, 04:57 PM
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This is what it should be. 265 tires are standard on the 4wd trucks, 245 tires are standard on the 2wd trucks..


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post #12 of 45 (permalink) Old 12-19-2010, 05:18 PM
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Truck in sig I have hit 90 mph and could have picked up another 5-10 mph?

1998 2500 4X4 CTD QCLB 3 inch lift-- Stablizer Bar-Tork Tek OFV-MAXX links-KDP TABBED-Luke's Link & Bushing POTS LMC dash #10 fuel plate AFC ISSPRO fuel- boost-2K* PYRO BHAF Posi-Loc Larry B Solenoid & relay rebuilt 47re low stall TC
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