Sounds to good to be true ?
my base line 264.1 with full bolt ons 304 avg and one run at 309 RWHP SAE.
44.9 rwhp increase. 7 AT.. elevation 700 ft.
was it standard rwhp or actual RWHP? My 309 becomes 322 standard.
the lower SAE is the only way to ready power.
Drive train loss is 20.45%.
I estimate mine puts out 385 at the crank, and runs the 1/4 in 12.42.

Z.

Plus for above, Base line was like mine. 257 WHP, I,E and Tune and made 298 WHP. Also 7spd auto,, It is too good to be true.. EH :/

My NISMO put down 311 with Art pipes and Drop in filters.. Would have been more but hit the Speed limiter in 5th gear.

other NON NISMO 370's put down 285-295 with intake and exhaust.

Same day, Same DYNO.

What is the true reason why NON NISMO 370z can't make the same power as NISMO 370z?

I am at 280 TQ so not sure why a Nismo with those bolt ons would only be at 260 or so.

Gonna depend on the engine tune. The NISMO has a different tune than other Z's.

The OP was assuming 20% loss to the wheels. If you are looking at WHP, and want to reverse the 20% loss, you multiply by 1.25.

(if you take away 1/5 of any number, then you add back 1/4 to the new number, to get back to the original number.)

From other postings here I was thinking the loss is about 15%. But who knows. How can you actually tell?

I think the Z has slightly lower drivetrain loss than many other RWD cars due to the CF driveshaft and reasonably light wheels. I would have used Nissan's crank numbers and backed out the WHP/FWHP correction from that rather than the other way around.

But it looks like they're more interested in comparing dyno numbers between cars to compare relative output, and in that case assuming a fixed value makes the most sense. That lets them use larger numbers for the customers and at the same time compare dyno figures without manufacturer claims changing things.

That's 25%

May be misunderstanding with what you are meaning, but it's the correct amount for what he is saying.

100 x 20% = 20 which when subtracted would leave you at 80.
80 x 25% = 20 which when added back brings you to 100.

Edit: Now that I think about it, my math from earlier may be wrong. To sleepy to look. Maybe tomrrow.

:icon14:

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

:icon14:

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

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