Nissan 370Z Forum - 340Whp & @260TQ NISMO

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Quote:

Originally Posted by Cmike2780 (Post 1597101)

Why are you multiplying percentages?:icon14::icon14:

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.

Quote:

Originally Posted by Red__Zed (Post 1597184)

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.

Quote:

Originally Posted by Cmike2780 (Post 1597257)

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

Math is critting people today. Glad we don't have to binary or hex conversions, lol! Let's network our Zs/Mustangs and creat a supernet, lol......

Quote:

Originally Posted by Red__Zed (Post 1597270)

Adding 25% is simulating a 20% loss

You're misinterpreting what I'm saying.

Quote:

Originally Posted by Cmike2780 (Post 1597309)

You're misinterpreting what I'm saying

Please do clarify then.
In case you forgot, we are looking to reverse a 20% loss....
http://img.tapatalk.com/a6937cb5-c48a-4fe8.jpg

The 1.25 he was referring to isn't to your formula. I wasn't saying you were wrong.

Dyno-Comp - Tuning

how funny...what have I started?

we all know this, it just shows how hard it is to write a short description so well that everyone interprets it the same.

The confusion here is the percentage is referenced to the starting point. So it is different when moving from high to low than from low to high.

Start with 5 quarters. Take away 1. You now have 4. It's a 20% decrease.
Start with 4 quarters. Add 1. You now have 5. It's a 25% increase.

What I want to still know, WHAT is the loss from bhp to whp for the 370Z?

Quote:

Originally Posted by Cmike2780 (Post 1597366)

The 1.25 he was referring to isn't to your formula.

Dyno-Comp - Tuning

:shakes head:

What is your math background?

This might help if you want to see another source:

http://www.someblogsite.com/percentage-calculator

:wtf2:

can we leave math class and go back to the original topic now?

Quote:

Originally Posted by Cmike2780 (Post 1597309)

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.

20% of 365HP = 73WHP lost.

365-73 = 292WHP

Total drivetrain loss measured is 20%.

It's pretty freakin simple. Stop complicating this thread.

If the gentlemen's agreement was still in effect, this thread probably wouldn't be going right now.

So are we going with 20% loss? And that number is on average correct?

IMO even 20% is too high for a short wheelbase RWD car that has a carbonfiber driveshaft. I'd say that 17% is probably more accurate for Zs. 15% for FWD cars. And 20% is usually the standard for other RWD cars.

The Z's have a carbon fiber driveshaft?