IX Brochure, HP/TQ Curve Question
#1
IX Brochure, HP/TQ Curve Question
I'm going to buy a IX soon and was looking thru the brochure. On the HP/TQ curve I noticed that they don't cross at ~5250 RPM but instead cross at ~3500.
If by definition: HP=(TQ*RPM)/5252, then they have to cross at 5252. Don't they? Since a brake dyno measures torque and then they convert to HP using the formula, I don't understand this. Every curve I've ever seen cross at ~5250 except this one. Does Mitsubishi believe in ponies and not horses?
Someone please explain what I'm missing here
If by definition: HP=(TQ*RPM)/5252, then they have to cross at 5252. Don't they? Since a brake dyno measures torque and then they convert to HP using the formula, I don't understand this. Every curve I've ever seen cross at ~5250 except this one. Does Mitsubishi believe in ponies and not horses?
Someone please explain what I'm missing here
#2
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Originally Posted by Steve_P
I'm going to buy a IX soon and was looking thru the brochure. On the HP/TQ curve I noticed that they don't cross at ~5250 RPM but instead cross at ~3500.
If by definition: HP=(TQ*RPM)/5252, then they have to cross at 5252. Don't they? Since a brake dyno measures torque and then they convert to HP using the formula, I don't understand this. Every curve I've ever seen cross at ~5250 except this one. Does Mitsubishi believe in ponies and not horses?
Someone please explain what I'm missing here
If by definition: HP=(TQ*RPM)/5252, then they have to cross at 5252. Don't they? Since a brake dyno measures torque and then they convert to HP using the formula, I don't understand this. Every curve I've ever seen cross at ~5250 except this one. Does Mitsubishi believe in ponies and not horses?
Someone please explain what I'm missing here
#3
the RPM scale is the same: 1000-7000.
I couldn't find where you could download the US brochure, but here is the UK one. The power curves are in there and you can see where they cross.
http://www.mitsubishi-cars.co.uk/evo..._download.asp#
I couldn't find where you could download the US brochure, but here is the UK one. The power curves are in there and you can see where they cross.
http://www.mitsubishi-cars.co.uk/evo..._download.asp#
#6
Originally Posted by jamevo8
WTF the dealer I got my IX at said they didnt make brochures?
On the dyno charts, I dug out the brochure on my 92 Talon they cross at 3000RPM. Strange.
#7
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Why does it matter? It's not a realy dyno graph anyway. They list the IX at 286/296 or whatever, but it dyno's 270/270 on a Dynojet, which indicates that Mitsu's published numbers are way off. I don't even know what that graph in the brochure is trying to say. It's in different units of measurement than we use, and the torque is wayyyyyyy lower than the HP, which isn't normal either.
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#9
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Originally Posted by Steve_P
If by definition: HP=(TQ*RPM)/5252, then they have to cross at 5252.
Dave
#11
Originally Posted by snowmants
note the increments are different on left and rightt!!!!!! im looking at the brochure right now. that will make them cross at a different spot.
It doesn't matter, I was just curious. I believe the chart is flywheel HP/TQ so it is obviously going to be different than wheel results.
djh: The US brochure uses HP and LB-FT, the "correct" units. If the "y" scales were equal they would cross at 5252 because of the reasons listed in my first post.
Last edited by Steve_P; Dec 21, 2005 at 11:06 AM.
#12
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My guess is that because the units are in Newton-Meters and Kilowatt-hours, the curve crosses at a different point. I don't have time to review the derivation of horsepower from torque, but changing the units could affect this, since they are graphed on the same X axis but on different Y axes.
#13
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Originally Posted by Steve_P
djh: The US brochure uses HP and LB-FT, the "correct" units.
But if you were to plot power in kilowatts and torque in newton-meters on the same scale you'd find the curves cross at ~9549 RPM.
By definition:
1 kilowatt = 1000 newton-meters/second
1 horsepower = 550 foot-pounds/second
1 RPM = 2 Pi/60 radians/second
Play around with those numbers and units and you'll see where the magic 5252 and 9549 come from. Oh, radians are actually "dimensionless units" so you can just drop them when they get in the way.
Dave
#14
I guess I shouldn't have posted the EU brochure because that further confused things. My bad.
Yes, I am a ME, I understand where the units come from. Thanks for the reply though.
Oh, and I meant "correct" per my example. I agree metric is much better.
Yes, I am a ME, I understand where the units come from. Thanks for the reply though.
Oh, and I meant "correct" per my example. I agree metric is much better.
Last edited by Steve_P; Dec 21, 2005 at 01:54 PM.
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