340Whp & @260TQ NISMO

Cmike2780 · 03-13-2012, 03:40 PM

Quote:

Originally Posted by Red__Zed

Do they not teach math in schools anymore?

100*.8 = 80

When the bhp is unknown:

X*.8=80

80* (1/.8) = x

80 *1.25= 100

Why are you multiplying percentages?

1.25 (25%) number is the percentage factor. 1.20 would be 20%

for example:

300hp @ the wheels x 1.25 (25%) drivetrain loss=375 hp @ the fly

or reverse

375 hp @ the fly/1.25 (25%) drivetrain loss=300hp @ the wheels

Red__Zed · 03-13-2012, 04:14 PM

Quote:

Originally Posted by Cmike2780

Why are you multiplying percentages?

1.25 (25%) number is the percentage factor. 1.20 would be 20%

for example:

300hp @ the wheels x 1.25 (25%) drivetrain loss=375 hp @ the fly

Cmike, I honestly can't tell if you are just messing with me. If you are, please disregard the following (and insert joke about NYC schools)

OK. Let's talk through this slowly.
Let's say you have a car with 100HP at the crank.

If there is a 20% drivetrain throughout, you will have 80HP at the wheels, because:

drivetrain throughput = 1- drivetrain loss = .8

100*.8=80

Are we tracking this far?

Now, we want to calculate BHP from WHP. To use the same numbers, we have 80HP at the wheels. We know we have an equation that looks like this:

80*Y=X

Where:
X= BHP
and Y = 1/(drivetrain throughput)

How do we get this Y?
Well, from our first equation, we have:
100*(drivetrain througput) = 80

Or

X*(drivetrain throughput)= 80

Or:

80/(drivetrain throughput) = X

Which is of course:

80*Y = X

To get Y, we take

1/.8 == 1.25

Cmike2780 · 03-13-2012, 04:45 PM

Quote:

Originally Posted by Red__Zed

Cmike, I honestly can't tell if you are just messing with me. If you are, please disregard the following (and insert joke about NYC schools)

OK. Let's talk through this slowly.
Let's say you have a car with 100HP at the crank.

If there is a 20% drivetrain throughout, you will have 80HP at the wheels, because:

drivetrain throughput = 1- drivetrain loss = .8

100*.8=80

Are we tracking this far?

Now, we want to calculate BHP from WHP. To use the same numbers, we have 80HP at the wheels. We know we have an equation that looks like this:

80*Y=X

Where:
X= BHP
and Y = 1/(drivetrain throughput)

How do we get this Y?
Well, from our first equation, we have:
100*(drivetrain througput) = 80

Or

X*(drivetrain throughput)= 80

Or:

80/(drivetrain throughput) = X

Which is of course:

80*Y = X

To get Y, we take

1/.8 == 1.25

Lol. You're over complicating it. The 1.25 referring to the original post is just used to see what a 25% would be added to the Dyno number. For 20% you would use 1.20.

Red__Zed · 03-13-2012, 04:51 PM

Quote:

Originally Posted by Cmike2780

Lol. You're over complicating it. The 1.25 referring to the original post is just used to see what a 25% would be added to the Dyno number. For 20% you would use 1.20.

Adding 25% is simulating a 20% loss

Cmike2780 · 03-13-2012, 05:01 PM

Quote:

Originally Posted by Red__Zed

Adding 25% is simulating a 20% loss

You're misinterpreting what I'm saying.

b1adesofcha0s · 03-13-2012, 05:22 PM

Quote:

Originally Posted by Cmike2780

You're misinterpreting what I'm saying.

What are you trying to say? I'm with Red on this one and I don't follow your logic or what you're trying to point out.

Red__Zed · 03-13-2012, 04:42 PM

Quote:

Originally Posted by Cmike2780

Why are you multiplying percentages?

1.25 (25%) number is the percentage factor. 1.20 would be 20%

for example:

300hp @ the wheels x 1.25 (25%) drivetrain loss=375 hp @ the fly

or reverse

375 hp @ the fly/1.25 (25%) drivetrain loss=300hp @ the wheels

The math you are doing here is 300 + (300*.25) = 375

Which is 25% more than 300

And 375/1.25=300

Which is the same as saying 375*(0.8)=300

300 is 20% less than 375. 375 is 25% more than 300.

You are interpreting the results wrong.

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