Effective NA Power Mods

[Tcoat]

Originally Posted by strat61caster

BS in Mechanical Engineering from a public university that ranks well and typically gets called a 'Public Ivy'.

Somebody shortchanged you on your education.

I finished a semester of grade 11 and agree with your evaluation.

[justatroll]

Originally Posted by DSLeach

I'm not going to continue this discussion because you clearly don't have the necessary education to understand the physics of this subject.

I'll just leave this here:


"SURFACE VEHICLE STANDARD

SAE J1349

7.5 Power and Torque Determination
7.5.1 TEST PROCEDURE
This section defines the actual dynamometer test procedure used in obtaining Rated Net Power and Torque. The test shall consist of a run at full throttle for spark-ignited engines and at a fixed full-load fuel injection pump setting for CI engines. The following test controls and operating conditions must be adhered to meet the requirements of this standard:
7.5.2 TEST POINTS
Measurements shall be taken at increments of no more than 500 RPM in sequence from the lowest to the highest engine speeds recommended by the manufacturer. The operating speeds shall include those for peak power and peak torque. Data at 100 RPM increments around peak torque and peak power are recommended to accurately distinguish their respective rated speeds. Engine speed shall not deviate from the nominal set speed by more than ±1% or 5 RPM, whichever is greater.

7.5.3 LOGGING OF MEASUREMENTS
No data shall be taken until torque and speed measurements have remained stable within 1% and controlled temperatures have remained stable within ± 2 C for at least 1 minute. The recorded measurements shall be the average of readings over a span of 1 minute. Alternatively, data can be taken by stabilizing the torque and speed for 5 seconds and then acquiring data at a minimum 10 Hz rate for at least ten seconds. If this alternative procedure is used, the entire speed sweep shall be repeated at least three times. The results are considered valid if the repeatability of at least three measurements is within 1% of the mean."

That says that (according to the definitive authority on automotive testing) that torque measurements are to be done at constant RPM.
So someone please tell me how rotational inertia can affect to torque produced at constant RPM?
(hint I already told you above)
If it is such simple physics, it should be a simple answer right?

[Lantana frs]

I had perrin pulley in 2013. Made the car feel livelier in lower gears. Coupled with a raised rev limit ate a crank bearing. For me, a good header and tune makes the car everything I could hope for.

[justatroll]

Originally Posted by DSLeach

Actually, I found a couple of good references for why rotating mass will affect your acceleration. The first a Tire Rack article on the benefits of lighter wheels and tires.

I never questioned that reducing mass and/or rotational inertia will give you faster acceleration.


I said it cannot make more hp


Or do you believe HP and acceleration are the same thing?

[humfrz]

Originally Posted by Tcoat

I finished a semester of grade 11 and agree with your evaluation.

........and THEN you got kicked off he short bus ...... ??





humfrz

[gramicci101]

Originally Posted by humfrz

........and THEN you got kicked off he short bus ...... ??



humfrz

Back then it was a short carriage.

[Tcoat]

Originally Posted by humfrz

........and THEN you got kicked off he short bus ...... ??





humfrz

No then I climbed on the short bus and joined the Army!

[humfrz]

Originally Posted by Tcoat

No then I climbed on the short bus and joined the Army!

........ so, then they took away your padded helmet and issued you a steel pot .... ??




humfrz

[Tcoat]

Originally Posted by humfrz

........ so, then they took away your padded helmet and issued you a steel pot .... ??




humfrz

With a fiberglass liner yes!

[humfrz]

Originally Posted by Tcoat

With a fiberglass liner yes!

It must have been difficult to lick the windows on the bus with that on your head .........


humfrz

[Tcoat]

Originally Posted by humfrz

It must have been difficult to lick the windows on the bus with that on your head .........


humfrz

No it was OK the officers showed us how. They had years of experience at it. The Captains seemed to be very proficient.

[humfrz]

Originally Posted by Tcoat

No it was OK the officers showed us how. They had years of experience at it. The Captains seemed to be very proficient.

Just how do you think they made captain ....... ??


humfrz

[Ultramaroon]

Originally Posted by DSLeach

I'm not going to continue this discussion because you clearly don't have the necessary education to understand the physics of this subject.

Show us your work so we can discuss. Show us how much of a difference your lightweight pulley will make given a simple mass model of the vehicle.

I'll even do you a solid. You may neglect internal frictional losses, rolling resistance and drag.

[Cole]

All these pulley debates remind me of the great physics question:

If you put an airplane on a treadmill that matches the wheel speed of the airplane perfectly so that no forward motion of the plane is achieved, will it take off?