Torque and Power Comparison

Submitted: Thursday, Feb 28, 2008 at 12:55
ThreadID: 55004 Views:2600 Replies:7 FollowUps:6
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Hi
Are there any experts on Torque and Power.
I am trying to compare a Jeep Cherokee 2.8 diesel with 120kw @ 3800rpm and 400nm @ 1800-2400rpm with stated towing capacity of 2800kg against a Prado 3.0 diesel with 127kw @ 3400rpm and 410nm @1600 rpm with a stated towing capacity of 2500kg.
They both have aratio of around 1:2.1 but the Jeep needs higher revs to achieve the same power/torque. What are the issues in regard to towing a trailer around 1000kg?
Thnaks
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Reply By: Gronk - Thursday, Feb 28, 2008 at 13:07

Thursday, Feb 28, 2008 at 13:07
At that weight.....none really...especially if its an auto..

You would start noticing the lack of a bit of torque at lower revs if the weight of the trailer was 1600 to 2000kg's, but with that amount of power and torque, they both make good tow 4x4's...
AnswerID: 289804

Follow Up By: Findanomad - Thursday, Feb 28, 2008 at 13:46

Thursday, Feb 28, 2008 at 13:46
Thanks, we were thinking of auto and the price difference is over $10 grand.
Cheers
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Reply By: Off-track - Thursday, Feb 28, 2008 at 14:43

Thursday, Feb 28, 2008 at 14:43
Those figures are peak power and torque which means little if the power and torque bands are narrow. Try to find a graph or similar to indicate how broad the power and particularly the torque bands are.

But like said, at that weight it will be of little concern.
AnswerID: 289815

Reply By: traveller2 - Thursday, Feb 28, 2008 at 15:16

Thursday, Feb 28, 2008 at 15:16
Personally I'd go for the auto if towing, easier for the engine to get on boost off the mark and in hilly terrain especially if it has a narrow or peaky torque band.
Takes a lot of strain off the drivetrain too.
AnswerID: 289818

Reply By: Gerhardp1 - Thursday, Feb 28, 2008 at 20:20

Thursday, Feb 28, 2008 at 20:20
If you haven't bought the Jeep yet, make sure you get the updated model - torque is uprated to 460nm and 130kw

Site Link

The new Jeep is only available with 5 speed auto.

There are runout specials on the current model, probably not too many in the yards.
AnswerID: 289873

Reply By: Member - Doug T (FNQ) - Thursday, Feb 28, 2008 at 20:29

Thursday, Feb 28, 2008 at 20:29
Try a Politician...they have both !!!!!!!

.
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AnswerID: 289875

Reply By: Richard Kovac - Thursday, Feb 28, 2008 at 21:37

Thursday, Feb 28, 2008 at 21:37
Findanomad

Prado 3.0 diesel is the winner

take Jeep 2.8 (120 kW / 3800 Rpm = 0.031578947 * 3400 Rpm = 107.36 kW) of power

Prado 3.0 (127 kW / 3400 Rpm = 0.037352941 * 3800 Rpm = 141.94 kW) of power

do the same with the torque

work = torque * distance

power = work / time

Regards

Richard
AnswerID: 289902

Follow Up By: Nomadic Navara - Thursday, Feb 28, 2008 at 21:59

Thursday, Feb 28, 2008 at 21:59
Richard

Please explain your maths. They make no sense to me.

PeterD
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Follow Up By: Richard Kovac - Thursday, Feb 28, 2008 at 22:06

Thursday, Feb 28, 2008 at 22:06
well if you have 120 kW at 3800 Rpm it is the same as 107.36 kW at 3400 Rpm.
so to compare one with the other divide and multiply to come up with an answer to compare.

Richard
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Follow Up By: Gronk - Friday, Feb 29, 2008 at 01:17

Friday, Feb 29, 2008 at 01:17
???????????????????????????????????

In theory you could still have 120kw at 3400rpm !!! Depends on the torque curve ......
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Follow Up By: jeepthing - Friday, Feb 29, 2008 at 10:10

Friday, Feb 29, 2008 at 10:10
You are spot on Gronk. I'd back the Jeep over the Prado any day but I'm bias:) As Gerhardp1 said the lastest Jeep Cherokee puts out 130kw and 460 torque and I do believe that the Prado doesn't have the wider torque curve as the Jeep
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Follow Up By: Richard Kovac - Friday, Feb 29, 2008 at 22:26

Friday, Feb 29, 2008 at 22:26
Gronk

you need to reread it I haven't got the torque curve...

so if you work it out at the two givens then you have to come up with an answer
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Reply By: Findanomad - Friday, Feb 29, 2008 at 10:36

Friday, Feb 29, 2008 at 10:36
Thanks
We have had two Prados but getting a bit expensive so the Jeep is looking good. Just have to convince the boss.
Cheers
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