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Cleetus McFarland: dual rear axle 37' limo for demo drags

Posted: Sun Apr 08, 2018 7:04 pm
by kevm14
https://youtu.be/1wnumZqE5H8

I NEED to drive this.

Subscribed.

Re: Cleetus McFarland: dual rear axle 37' limo for demo drag

Posted: Mon Apr 09, 2018 7:16 pm
by kevm14
https://youtu.be/l-6yTghF3Yg

Just in case you think limos have special super high performance engines...it does sound good at least. That rev limiter does not sound stock, also.

Re: Cleetus McFarland: dual rear axle 37' limo for demo drag

Posted: Tue Apr 10, 2018 5:50 am
by kevm14
I don't know if the exhaust was aftermarket or just broken. Again, that rev limiter sounded like a sport bike. That's not how a stock one sounds. Either that or it was Ford coil breakup at high rpm which would have been hilarious.

I'm thinking the only reason it even did a burnout, well, aside from the water, is because of the dual rear axles. The rear axle (effectively a tag axle) was taking 50% of the load back there.

Re: Cleetus McFarland: dual rear axle 37' limo for demo drag

Posted: Tue Apr 10, 2018 9:21 am
by Bob
This is awesome. 23 seconds @ 59!

Re: Cleetus McFarland: dual rear axle 37' limo for demo drag

Posted: Tue Apr 10, 2018 9:34 am
by kevm14
It seems like it takes 10 seconds just to get through first gear.

And that 1-2 shift sounds incredibly labored.

When I was a kid I thought all limousines had high power engines because they always seemed to be going 80-85 on the highway.

I also thought that the top speed of a semi truck was governed by its high torque output. After all, how could you possibly motivate a giant truck with trailer up to 80 mph other than with a ludicrous torque figure like 1500 lb-ft? But no. It's limited by the horsepower, like it is in all physics. 400 hp is 400 hp, no matter at what RPM it is produced, as long as you are operating at that RPM. If you are not, then the shape of the HP curve is important (which you can SOMETIMES infer from the peak torque number, but not always).

Another reason I like to say HP is more important than torque is picture two graphs - I just thought of this. One is of torque. Y axis is lb-ft. X axis is unlabeled RPM (lower to higher). You know the shape. You know the peak torque. You don't know the exact RPMs.

Now picture another graph. Y axis is HP. X axis is unlabeled RPM (lower to higher). You know the shape and the peak horsepower. But you don't know the exact RPMs.

Here's the key point: you can actually very precisely predict work done by the HP graph even though RPM is unlabeled. Which you can convert to a 1/4 mile estimation or whatever else you want. You CANNOT do the same with the torque graph, because the amount of work done at a given torque output is wholly dependent on the RPM at which that torque is applied (which is horsepower). But the horsepower at a given mystery RPM is still that horsepower, regardless of what RPM the engine spins to make that power. All that would change is the gearing required for your final drive. With the torque graph, you could have 1 horsepower, a million horsepower, or more (or less). There is no way to tell.

Re: Cleetus McFarland: dual rear axle 37' limo for demo drag

Posted: Sun May 06, 2018 4:59 pm
by kevm14
Here is the event.

https://youtu.be/vdFZdgfgmUo

B-body content, too!