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Dex
Dodge Dakota
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4/08/2006
10:58:00
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 Subject: 3.9l Torque Curve
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Message:
I know the 3.9l has a maximum torque of 225ft/lbs.
I think it hits the max at 3200 rpms.
Questions
What is the ft/lbs at 2000 rpms?
Is the max ft/lbs at 3200 rpms?
Thanks
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Scott C.
Dodge Dakota
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4/08/2006
19:08:04
| RE: 3.9l Torque Curve
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Message:
unless anyone here has dyno'ed their truck being stock thats a had question to answer... just figure 100% of its torque is 225 at 3g break it down in precentages... that should give ya an idea of what you might be looking for to answer your question.... but if your going over 3g on the RPMS the torque drops off so that answer only get answered by a dyno.... but only a dyno is gonna give ya your true answer of what you got at the wheels....
Scott C
Royal Auto
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Gunner
Dodge Dakota
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4/09/2006
06:58:00
| RE: 3.9l Torque Curve
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I dynoed my 2000 Dakota 4x4 3.9L when it was stock and it made the max torque at between 3300 and 3800 rpms.
It made 173 ft/lbs of torque between 3300 and 3800 and about 140 ft/lbs at 2000 rpms.
Hope this helps.
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Dex
Dodge Dakota
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4/09/2006
16:17:35
| RE: 3.9l Torque Curve
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Gunner,
Thanks for the info.
I'm trying to decide if I need a new truck to tow a 3,500lb (max weight) trailer I'm thinking of buying for an extended vacation.
2000 Quad Cab 4X4-Sport V-6 Automatic Sports Plus Package
31X10.5 tires, Limited Slip, 3.55 Gears, Trailer Tow Group, HD Package, Skid Plates, LineX Spray in bed liner; Added:Airaid air filter & heat shield, Flowmaster 3 chamber muffler, Steel Horse Torneau cover, front hitch, Autolite Double Platinum 3923 Plugs, Removed air horns from Throttle Boddy, added new TB bolts, Cool Tape around air filter and A/C tubes, Amsoil in: crank case, differential and tranfercase.
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Scott C
Dodge Dakota
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4/09/2006
23:35:58
| RE: 3.9l Torque Curve
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the dakotas with the 3.9's can handle up to 4500 lbs... i tow a car trailer with my 3.9 and thats around 5500 with a car... its an old steel trailer but it handles it fine without a prob
Scott C
Royal Auto
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Scott C
Dodge Dakota
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4/09/2006
23:38:39
| RE: 3.9l Torque Curve
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but also the dyno is showing rear wheel power.... the results you said of 225 and so forth are possible the manufactures results of power at the flywheel ....
Scott C
Royal Auto
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Dex
Dodge Dakota
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4/10/2006
09:22:44
| RE: 3.9l Torque Curve
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Scott C,
Do you have a Quad Cab 4x4?
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daddio
Dodge Dakota
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4/10/2006
12:02:31
| RE: 3.9l Torque Curve
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Dex, you may want to consider changing your gears. especially if you're going to tow through hills or mountains.
you've got a very heavy truck for the 3.9. i know i have a QC Sport 4x2 w/3.9, 5spd man, 3.55 gears and 235/75/15's. if i were going to get a travel trailer i'd get at least 3.92's or 4.10's. but that's my .02.
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Dex
Dodge Dakota
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4/10/2006
14:12:54
| RE: 3.9l Torque Curve
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Daddio,
I'm guessing it would cost me about $2,000 or more to change the gears.
Since the truck is a 2000 I might as well bite the bullet and get a new truck!
I didn't think I was going to really tow anything when I chose the engine
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daddio
Dodge Dakota
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4/10/2006
14:50:56
| RE: 3.9l Torque Curve
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well, if you're not that attached to your truck then by all means trade up. i thought you might already have the truck you really want, ie, color, options, etc. and really weren't looking to trade.
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wierdkid
Dodge Dakota
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4/13/2006
21:30:33
| RE: 3.9l Torque Curve
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that torque number is at the wheels. since sometime in the 70s all performance values are net (at the wheels) and not gross(at the flywheel) the reason why it probably read lower is because that 225 is under ideal conditions on a fresh and properly broken in engine/ drivetrain
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Snuzn2
Dodge Dakota
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4/17/2006
19:54:29
| RE: 3.9l Torque Curve
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Weirdkid, I don't mean to sound like a jerk here or anything, but... net hp is *not* rear-wheel hp. Net & gross hp are both measured at the flywheel. The difference between net and gross hp is this:
Gross hp was measured with all conditions optimum for maximized power production: no air cleaner, no mufflers, no accessories other than the water pump, and no emission controls - just the engine itself on a dyno. Also, timing and air/fuel ratios were optimized every 200rpm or so. In other words, gross hp ratings were a way for manufacturers to "cheat" and inflate their hp #'s for advertising purposes.
Net hp much more accurately reflects the hp you *actually* get at the flywheel. It's measured with all equipment installed on the engine that would be in place in the actual car - everything, all sensors, filters, emission control stuff, complete factory exhaust - everything. It is also measured at a higher temperature and % humidity to better replicate real-world conditions.
By the way, the switch from net to gross was in 1971.
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Snuzn2
Dodge Dakota
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4/17/2006
20:25:26
| RE: 3.9l Torque Curve
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...er, sorry about that typo - I meant to say, the switch from gross to net was in 1971.
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