Hub dyno Vs Roller dyno Vs tune

Optimiser · 12-10-2023, 07:56 PM

Can anyone enlighten me about the following dyno and power/torque results?
I have an air to air Vortech supercharger with ECUTEK tuning.
I just swapped out my old (cat less) Invidia exhaust system to an HKS system with Invidia high flow cats and therfore had to be retuned.
Since the most recent tune I seem to have more "mid range" power (as my shop explained to me) but it seems lacking up top compared to before.
The car seems to "pull" much better in mid range RPM's compared to before the exhaust system change and tune, but seems lacking up top now.
I do not have a comparison of this most recent tune on the hub dyno, only the roller dyno.
Can there also be such a big difference in up top power on a hub dyno compared to a roller dyno or is this not an optimized tune?
Please see pics.

2011 Nismo#91 · 12-10-2023, 09:39 PM

There can be a difference simply based on the weather. I wouldn't worry about it so much not only is your car different but. Different day, temps, dyno, barometer, calibration, tuner, tune, wear n tear, etc etc. In a lab and with both calibrated they should read very similar.

Rusty · 12-10-2023, 10:41 PM

You made a change in your exhaust. That will effect where the engine makes power.

pkxu123 · 12-23-2023, 08:16 PM

Is your latest tune 257kw or am I reading that incorrectly

12-10-2023, 09:39 PM	#2 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,381 Drives: slowly Rep Power: 33858	There can be a difference simply based on the weather. I wouldn't worry about it so much not only is your car different but. Different day, temps, dyno, barometer, calibration, tuner, tune, wear n tear, etc etc. In a lab and with both calibrated they should read very similar. Optimiser likes this. __________________ GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere.Full Specs

12-10-2023, 10:41 PM	#3 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,864 Drives: 2011 Nismo GM 6M Rep Power: 2684436	You made a change in your exhaust. That will effect where the engine makes power. Optimiser likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

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12-23-2023, 08:16 PM	#4 (permalink)
pkxu123 Base Member Join Date: May 2021 Location: Australia Posts: 29 Drives: 2017 Nissan 370z Rep Power: 28	Is your latest tune 257kw or am I reading that incorrectly