Proven Power Dyno Database Thread

[joshs09slvrZ]

Sweet!

[Motordyne]

Excellent data set Jordo!

[Jordo!]

Thanks!

[370zDR]

Addind to this old thread
-Engine Mods:
Art Pipes
F.I CBE 18" Resonators
Stillen G3's
NST Pulleys
Z1 25R Oil Cooler

Full Bolt ons untuned Vs Uprev Tuned
Weather conditions outside 83F 77% humidity
STD



SAE Corrected Numbers

[Jordo!]

While we're here, a quick example of four bone stock Z's making 4th gear pulls. Two are 7AT, 2 are 6MT. Variance when torque and horsepower are equal is about 3-5, and peak values on all four are around 275/225, give or take a few by that margin.



That variance of a few whp/wtq is probably due as much to ambient conditions (note the heat and/or humidity as well as air pressure) as anything, but other transient factors are probably at play too (e.g., wheelspin, break-in success, general measurement error).

Also note that some of the SAE correction factor (CF) values are pretty high -- as a rule of thumb, any CF > 1.02 is probably overcorrecting by a bit.

However, also note that STD CF's tend to be HIGHER than SAE, meaning they tend to be REALLY optimistic (I sometimes call them the "bragging rights" CF -- legitimate, but skews high rather than low). I personally prefer conservative over ego-sparing estimates. Think of SAE values as "sleeper" numbers -- your car is probably a bit more powerful than this number on the road; with STD, it's probably a bit less so in real life.

But that's for NA cars. For FI, the higher STD value is probably more accurate, because no CF takes into account the extra heat of compressed air, meaning SAE tends to greatly undercorrect by comparison.

[Hermitns]

you'll have to accept these #s until I can figure out how to post the printout they gave me.
Max HP was 313.3@ 7025rpm
torque @ 7025 shows 234.2 BUT from 3000rpm to 5000rpm torque shows 260 almost dead flat and tapers to 250 at 6700, dropping obviously to 234 at redline.
printout reads DYNOmite not dynojet or mustang.

[Jordo!]

Originally Posted by Hermitns

you'll have to accept these #s until I can figure out how to post the printout they gave me.
Max HP was 313.3@ 7025rpm
torque @ 7025 shows 234.2 BUT from 3000rpm to 5000rpm torque shows 260 almost dead flat and tapers to 250 at 6700, dropping obviously to 234 at redline.
printout reads DYNOmite not dynojet or mustang.

It will be hard to compare those readings to dynojet readings...

Do you have a baseline from when you were stock? That will make it easier to compare and contrast, because we can estimate the % gain from baseline.

Also, what mods?

[Hermitns]

unfortunately no baseline dyno. I have an unusual work schedule and have been trying to get the uprev for 2 months now.
Mods are stillen G3 and F.I. TDX 18" resonated w/ test pipes.
There were numerous Zs and Gs in the shop (including a brand new Nismo from North Dakota getting a top mount single turbo installed) I don't know if any of them have posted here.

[binary0x01]

Compared to stock, K&N Drop-ins + PostMafTubes = about what HP gained (on avarage throughout the rev range) ??

tnx

[Jordo!]

Well, back to Proven Power to dyno the new Zed

The weather was perfecto (SAE CF was 1.0) -- so conditions were ideal for a "true" set of measurements (by comparison, my old Z's baselines were taken at temps over 100* F, and all measured values were a good bit lower across the board, even with a more generous CF that attempted to account for the hotter temps).


Below are the best runs, all taken in 4th gear with oil temps between 180* - 195* F. Other runs hovered within 2-4 whp of the highest runs, but I can post them as well if folks wish to compare and contrast in obsessive detail.



First, bone stock vs. Cobb smooth tubes and humble K&N panel filters. Excellent gains for such an inespensive and easy to install mod.






Behold the detailed comparison to see where big vs. small gains were picked up throughout the rev range. No tuning as yet. Just the tubes and filters.





Last, my "bragging rights" dyno, so called because it uses STD correction, which invariably overestimates gains on NA cars (it is more appropriate for FI cars given that no CF takes changes in air temperature due to compression into account...).




Qualitatively, I'm a pretty liberal guy by nature, but when it comes to quantitative measurement, I lean conservative -- thus, I prefer SAE estimates (a bit stingy) for NA cars over STD (a bit overly generous), but here they are anyway as legitimate (if overly optimistic) numbers for consideration.


Headers, CBE, and tune coming soon

[W.O.W. 370Z]

Martin tuned it?

Sent from my SPH-D710 using Tapatalk 2

[Jordo!]

Originally Posted by W.O.W. 370Z

Martin tuned it?

Sent from my SPH-D710 using Tapatalk 2

At the moment, that is without any tuning.

Cooler weather is definitely helping out here, although I consider the more conservative SAE values more representative of what the car is actually putting down. STD values tend to be high for NA cars.

Also, those are the best runs. Successive runs were about 2-4 whp less as oil temps skewed closer to 200+* F.

If we want to be really (conservatively) fair, I'd say treat my reported SAE numbers as x -3 and that's what the car is consistently putting down with these mods under these conditions.

Expect those values to plummet by as much as 10% or more when summer heat and humidity returns to FL tho...

[SS_Firehawk]

Did you ever get the PPE's installed?

[Jordo!]

Originally Posted by SS_Firehawk

Did you ever get the PPE's installed?

Project got put on hold until July -- still definitely happening, but not for a little while

EDIT: no, no, I'm full of ****. I was broke and so they spent the year taking up space on my couch as a conversation piece (the conversation being "Hey, don't sit on my ******* headers!")

[SS_Firehawk]

Should grab a few local members and try to tackle it now :P Lure them with the promise of beer and Women!