340Whp & @260TQ NISMO

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.

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

roplusbee · 03-13-2012, 04:58 PM

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......

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.

Red__Zed · 03-13-2012, 05:05 PM

Quote:

Originally Posted by Cmike2780

You're misinterpreting what I'm saying

Please do clarify then.
In case you forgot, we are looking to reverse a 20% loss....

Cmike2780 · 03-13-2012, 05:15 PM

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

Dyno-Comp - Tuning

kcquinn49 · 03-13-2012, 05:17 PM

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?

Red__Zed · 03-13-2012, 05:17 PM

Quote:

Originally Posted by Cmike2780

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

Dyno-Comp - Tuning

What is your math background?

This might help if you want to see another source:

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

phelan · 03-13-2012, 05:21 PM

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

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.

AlphaSnacks · 03-13-2012, 05:24 PM

20% of 365HP = 73WHP lost.

365-73 = 292WHP

Total drivetrain loss measured is 20%.

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

roplusbee · 03-13-2012, 05:31 PM

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?

AlphaSnacks · 03-13-2012, 05:45 PM

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.

b1adesofcha0s · 03-13-2012, 05:53 PM

The Z's have a carbon fiber driveshaft?

03-13-2012, 04:58 PM	#34 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 22	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...... __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

03-13-2012, 05:15 PM	#37 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 29	The 1.25 he was referring to isn't to your formula. I wasn't saying you were wrong. Dyno-Comp - Tuning __________________ [09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R] [ArchitTEK Photography]

03-13-2012, 05:21 PM	#40 (permalink)
phelan A True Z Fanatic Join Date: Apr 2009 Location: CA Age: 38 Posts: 9,513 Drives: Scoobaroo Rep Power: 3406	can we leave math class and go back to the original topic now? __________________ 凛 ('Rin') - 2009 Nissan 370Z With silence comes peace. With peace comes freedom. With freedom comes silence.

03-13-2012, 05:31 PM	#43 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 22	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? __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

03-13-2012, 05:53 PM	#45 (permalink)
b1adesofcha0s A True Z Fanatic Join Date: Jan 2011 Location: MD Posts: 40,963 Drives: HypeTrain Choo Choo! Rep Power: 141	The Z's have a carbon fiber driveshaft? __________________ Project: b1adeZmobile (2009 370Z) \| Uprev Tune by AAM Competition \| Berk Exhaust Project: b1adeZmobile 2.0 (2014 C7 Z51) \| Corsa Xtreme Exhaust

03-13-2012, 05:17 PM	#38 (permalink)
kcquinn49 Base Member Join Date: Dec 2011 Location: Indiana Posts: 86 Drives: 2011 370Z Coupe Rep Power: 249	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?

03-13-2012, 05:24 PM	#42 (permalink)
AlphaSnacks A True Z Fanatic Join Date: Jan 2010 Location: Windermere, FL Posts: 1,618 Drives: '13 XKR-S, '10 370Z Rep Power: 18	20% of 365HP = 73WHP lost. 365-73 = 292WHP Total drivetrain loss measured is 20%. It's pretty freakin simple. Stop complicating this thread.

03-13-2012, 05:45 PM	#44 (permalink)
AlphaSnacks A True Z Fanatic Join Date: Jan 2010 Location: Windermere, FL Posts: 1,618 Drives: '13 XKR-S, '10 370Z Rep Power: 18	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.

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