340Whp & @260TQ NISMO
 

Has anyone checked this out yet?
340 to the wheels using only Stilled products and UpRev to tuen it...

Dyno-Comp - Blog

At least they admit the skew

I thought the NISMO was rated at the 350 mark, or am I missing something?

The dyno reads high

Very generous dyno. I'd like to see some trap speeds of this 350hp beast.

I have one question.. Why are they multiplying the WHP by 1.25 to estimate the crank HP?

Isn't the drivetrain loss in manual Z's estimated at around 17%-18%..?? I think 25% is a bit high..

This is pretty much my next question. Why 1.25? Where are they getting it from?

Instead of:

Shouldn't it be:

292whp x 1.20 = ~350hp
230wtq x 1.20 = ~276tq

Then using that 1.20 to finish out, their final numbers would be:

340whp x 1.20 = 408hp
260wtq x 1.20 = 312tq

Is this the wrong approach?

Because nothing is better than a horsepower circle jerk

Why is a NISMO with the same mods of a 370z much higher in WHP? Wouldnt they be both around the same power but they are both with the same mods?

EH waste of $$$ if you ask me,, I made 298 WHP and 240 WTRQ, Stock headers and stock cats in a 7spd X coupe. For 40 WHP. Stillen's dyno is very generous at best, Their" 515HP SC kit" made 440HP( 365 WHP) before I was tuned. Stillen dyno= INFLATED.. :)

I think they cooked the books on this one.

I wish my bank account could do the same.. lol .... thanks for the reply


BTW: How are you liking the Stillen SC? Ive been wanting to get one but every one has been telling me to go TT.. Do you feel alot of power and can you upgrade to higher boost?

lol...........that would be nice as well!

I'm loving the kit, The car is a complete animal, Ripped on the HW on Saturday and hit 142 MPH in 5th( With lots of room left).( Yes HW was very clear) Me and one other car..I can up the boost with just a pulley change and return, But for me it us more than enough,, LOL for now, I'm looking into the GTR's pistions and rods:tiphat:.

I think that's right and closer to the truth.

350hp (per Nissan)/292whp (dyno)= x(approx. hp @ flywheel)/340whp (dyno)
x=407.53 hp @ the crank.

Still pretty good numbers even if the dyno reads high. You can inflate the numbers, but you should only be looking at the difference from the baseline anyways. My understanding was, that the 48whp increase from baseline is more important than the actual hp reading on the dyno.

This a link on there for determining the numbers they used.
http://dyno-comp.com/tuning.php#dyno101

Seems kind of odd. It would mean most stock non-Nismo's should have numbers closer to 345hp at the flywheel.

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

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.

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......

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?

: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?