Driving Hard?

[XS650]

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Originally posted by Mitch Alsup:

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At 68mph you might require 40-50 hp. This and the constant throttle make for an easy life for the engine.

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I bet at 68 MPH he needs closer to 4 or 5 HP to overcome aerodynamic friction and rolling drag.

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5 hp won't make a bicycle go 68 mph.

5 hp at 68 mph gives 27.5 lb of motivating force.

 

[VaderSS]

I knew that it was squared or cubed. I did not want to say squared or cubed, and I knew it was a function of an exponent and not linear, so I thought it was exponential. Next time I'll just say what I mean.

At any rate, I don't feel nearly as bad as I did when I had it pointed out that I've been mispelling peeve for at least a decade...

I had 1.67 GPA in my college maths and calculus almost did me in... I'm good with a calculator though. My overall was 3.2, so I ain't some dummy though.

Man, think I'll go do a burnout in the Impala. It's finally back on the road. As hard as I drive it, a friggin' burnt wire does it in... Guess Mobil (not Mobile) 1 is good for something. Hope the elves are as kind to me.

 

[oilpan49]

this thread has inspried me to get on 71, set the cruise for about 70 and just let my truck go free. I've had my truck for alittle over 2 years and it's never seen interstates before. I don't think the previous owner drove it on the freeway ever before either??? I don't reckon anyway,,,,,,AR

 

[mechtech]

How about figuring HP needed at highway speeds by this left handed way:
Let's make it easy.
assume: 30 MPG
60 MPH
That = 2 gallons per hour
It takes about .45 lbs of fuel per HP per hour.
Gasoline is about 6.25 lbs per gallon.
So 12.5 lbs / .45 lbs = 27.77 [HP]
Close enough.

 

[Quattro Pete]

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Originally posted by brianpavlovic:
Well, I just bought the car in March and I want to break her in easy.

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Actually, driving at a constant speed (you mentioned constant 68) must be avoided during break in. It should say so right in the owner's manual. You should vary the rpms as much as possible throughout the whole range, putting some load on the engine.

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Once the break in time is complete, I will probably drive it like it was supposed to! The car has 1500 miles!

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At this point, I'd say you're done with break in.

 

[1maniac]

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Also with todays turbos you really don't have to idle it "separately" at shut off.

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I am not sure this is such a good "one size fits all" statement. If you run that turbo hard and get her hot you want to let her cool down as much as possible before you park it.

 

[daemonite]

quote:

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Originally posted by Quattro Pete:

quote:

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Originally posted by brianpavlovic:
Well, I just bought the car in March and I want to break her in easy.

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Actually, driving at a constant speed (you mentioned constant 68) must be avoided during break in. It should say so right in the owner's manual. You should vary the rpms as much as possible throughout the whole range, putting some load on the engine.

quote:

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Once the break in time is complete, I will probably drive it like it was supposed to! The car has 1500 miles!

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At this point, I'd say you're done with break in.

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true!
vary your RPM's and speed.

I went shifting out at 2500rpm for the first 500 miles...then shifting at 3500... for the next 500
and then 4500 in the next 500 and redline by 2000 miles...

allows the rings to seat, the pistons to stretch and my engine to wear in correctly.