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jasonsdakota
Dodge Dakota
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4/15/2007
21:45:46
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 Subject: 4x4 dyno vs 2wd dyno
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Message:
ok, we all know a 4.7 dakota with auto is about 15-20 hp less power to the wheels than a manual. my question is, with the same transmission, how will a 2wd compare to a 4x4. example on a 2004 ext cab dakota with 4.7 and manual tranny. compare a 2wd with a 4x4 for me.
any word on gas mileage would be nice too.
by the way, i don't mean full time awd, just a part time transfer case. how much power does it suck?
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GraphiteDak
GenIII
4/15/2007
22:03:15
| RE: 4x4 dyno vs 2wd dyno
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Message:
To me it seems that the 4WD drivetrain has a greater power loss the faster we go with the extra diff and transfer case spinning all of the time, etc.
Whenever I am at the track and race a 2WD that is a close match I many times will pull ahead somewhat to about half track then get passed after that. It's got to rob more power with speed. That's the price we pay for 4WD I guess.
Even tho we have PART TIME that just means it's not having to turn at the EXACT same speed front and rear with the transfer case gears disconnected. However, ALL of the parts are still rotating because of the front wheels tuen the front diff whcih turns everything all of the way back to the transfer case!
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jasonsdakota
Dodge Dakota
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4/15/2007
23:58:35
| RE: 4x4 dyno vs 2wd dyno
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Message:
good point. so even though it may come close on the dyno, there is drag on the front wheels that slow you down especially at high speed. that will hurt mileage too, but not show up on the dyno.
well, anyone know what the dyno loss is, not counting the drag on the front wheels?
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Kowalski
GenIII
4/16/2007
15:43:03
| RE: 4x4 dyno vs 2wd dyno
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Shouldn't be much dyno loss - the loss is over the road as GD explained...
Lead, follow, or get out of the way
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Hollis
Dodge Dakota
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4/16/2007
22:53:21
| RE: 4x4 dyno vs 2wd dyno
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I have an AWD 2001 4.7 QC. What difference do you think that would make?
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GraphiteDak
GenIII
4/17/2007
22:37:14
| RE: 4x4 dyno vs 2wd dyno
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Message:
Yeah Kowalski, on a Dyno with ONLY the rear wheels spinning you would not see the real loss as them parts are NOT rotating.
But when you drive, the truck has to TURN all of that stuff. I bet it could be 20HP for all we know!
1HOTKADOTA had similar mods to me back when we raced at the track. I actually pulled him by a few feet right away (when I had STOCK rear gears) and I thought maybe my peppy truck would have a chance.
Nope... his 2WD truck caught up by the 1/8 and then had me by a good second or so by the 1/4!
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jasonsdakota
Dodge Dakota
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4/18/2007
12:13:58
| RE: 4x4 dyno vs 2wd dyno
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how much gas mileage difference is there usually?
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GraphiteDak
GenIII
4/18/2007
14:40:24
| RE: 4x4 dyno vs 2wd dyno
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I heard it's about 2 to 3 MPG.
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jasonsdakota
Dodge Dakota
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4/18/2007
14:53:54
| RE: 4x4 dyno vs 2wd dyno
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are you sure?
that's a big difference!
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GraphiteDak
GenIII
4/18/2007
16:22:28
| RE: 4x4 dyno vs 2wd dyno
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Message:
I am sorta sure.
My 4X4 QC is rated 14-City, 18-Highway
I think some people say a 2WD 4.7 version does around 21 Highway!
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