How much more HP do I have to make

[tcourse]

How much more HP and Torque do I have to make to overcome the difference in weight and drivetrain in my 3500 compared to a 2500 4x4.



Can someone help me out with this?



Thanks, TC

 

[WCrovo]

YOU HAVE MORE THAN MADE UP FOR THE WEIGHT WITH THE 120.

 

[tcourse]

WCrovo

Maybe I should have posted this in the Comptetion forum.



I noticed you still have your ad in for the mirrors. Did the deal fall thru?



TC

 

[MikeR]

To do what?? The first thing to do is run your truck over the truck scales there on I-5 in Federal Way (go at night when they're closed).

 

[DEZLPWR]

Mike,

Do they still give you a reading when they are closed?

 

[pnwradar]

The WA scale operators usually leave the scales operating, and turn the display so that you can see it from the scale. Not all the scale ops do it, and not all scales are left running 24/7.



Another way is to hit the local dump transfer stations. If it's a non-busy weekday, they will usually let you slide in and out to get a weight reading.



-jon-

 

[tcourse]

Try this again

Mike, I know why you say to weigh the truck. I'm not looking for hard numbers here. Take 2 trucks one 2500 with Dana 70 and one 3500 with Dana 80 and duals and whatever the weight difference is. I was wondering how much more power I'd need as an equalizer.



Will bigger injectors alone make up for the added weight and driveline mass? Am I not making sense?



Thanks, TC

 

[Chris N5CWM]

About 500 LBS difference usually

My 2001 3500 4x4 QC ETC/5spd weighed

7,200 lbs; and my current Ram, 2001. 5

2500 4x4 QC short bed ETC/5spd, which

has the Dana 80 rear (all manual transmission

2500 Cummins do) weighs 6,680 LBS.

These weights are with no one in the

truck, about 1/2 fuel and were taken at

the CAT certified scale at the Houston TX

Flying J truck stop. Neither truck had any

aftermarket bumpers/pushbars/toolboxes

etc installed.

I'm posting this info so you can establish

a "baseline". . there are formulas that can

give you a close guesstimate as to the

difference in HP based on weight and ET.

I don't know what they are off the top of

my head; anyone care to chime in?

*edit* My 2500 has aluminum wheels;

the duallies have 6 heavy steel wheels;

also the additional weight can be

accounted for in the difference

between the longbed and shortbed,

and the longer frame of the longbed.



-Chris

 

[tobaccogrower]

more hp?

you can NEVER have enough HP... ... james

 

[Batman]

Enough Horespower James?????????

James

Looks like we'll be finding out how much more your getting now from the last dyno run..... 8 days and counting.

 

[MCummings]

Re: Try this again

Originally posted by tcourse

Mike, I know why you say to weigh the truck. I'm not looking for hard numbers here. Take 2 trucks one 2500 with Dana 70 and one 3500 with Dana 80 and duals and whatever the weight difference is. I was wondering how much more power I'd need as an equalizer.



Will bigger injectors alone make up for the added weight and driveline mass? Am I not making sense?



Thanks, TC

I think I know what your saying,, I was thinking the same thing.



Lets see if I can put this into an example...



Take two Dodge Cummins trucks,, one a 3500 and the other a 2500 long bed.



How much more HP does the 3500 have to make to keep up with a 2500?



a 300RWHP 3500 truck will not be as fast as a 300RWHP 2500,, SO,, How much more HP/TQ does it take for a 3500 to go just as fast as a 2500 ? As in 1/4 times, 0-60 etc.



Hope this helps,

MerrickNJr

 

[tcourse]

Thanks Merrick

That was the question. Both Autos.

 

[Chris N5CWM]

Re: both autos...hmm

Originally posted by tcourse

That was the question. Both Autos.

Plug in an Edge EZ and whup that guys a$$!



-Chris

 

[MikeR]

Terry,

I know exactly what you're saying, that's why I said to weight the truck. For example: Chris' post above says his 3500 4x4/5spd weighs 7200 lbs, but my 2500 4x4/6spd weighs 7320 lbs, and mine weighs 640 lbs heavier than his 2500 4x4. So the question is, how much heavier (or is it even heavier at all) is the truck in question? Obviously trucks with different accessories aren't going to match a simiar rig.

There's a formula you can get your trucks horsepower from with a 1/4 mile run, but you need to input the trucks weight to the formula. With such a formula you can estimate how much more power it would take to get a 7500 lb truck to run the same as a 7100 lb truck, and etc.



Yes, the scale operators always leave the displays on even when they're closed,but you'll need a passenger to get out and read the display (it's not facing the truck) while you roll across one axle at a time there in Federeal Way. There's also one on Hwy 410 west of Buckley, and another one on I-90 between Hwy 18 and Sno-Falls exits.



-Mike

 

[pwr2tow]

the extra tires will eat some horse power, how much I don't know.

I had a warmed over 1970 chellenger 4 speed and with L50 tires I would get better ET's than with N50 series tires. I just controlled the wheel spin with the clutch.

Ron