Gio's Dyno Results Oct 2005

Back in October 1999, I swore I would never do another dyno run with my Z. So here it is!*

Thanks Jay, thanks Surrey Rolling Road and thanks Japanese Performance.

As for my Z and the ecuXtend: instant extra 18hp flywheel hp / 16 rwhp.

Using the ecuXtend to cut the fuel injector timing to 90% on my car immediately increased flywheel power by 18.4hp from 266.4hp to 284.8hp and torque from 271 to 282Ft/lb.

Parameter
stock
ecuXtend 90% fuel injector timing
gain
% gain
rear wheel power bhp
218.4
234.3
15.9
7.3%
rear wheel torque ft/lb
222
231
9
4%
 
estimated flywheel power bhp
266.4
284.8
18.4
6.9%
estimated flywheel torque
271
282
11
4%

There is much talk about rear wheel vs flywheel (or crank) hp. As an ex-physicist, I can promise you that the only real figure is the one you actually measure: the one at the wheels. All other figures are estimates varying from the customer-pleasing finger-in-the-air to the extensive database maintained by Dyno Dynamics.

According to the book, Nissan claimed 280bhp at the flywheel for the Manual TT so to get 266.4 for a stock 15 year old Zed made me pretty happy. Beating the manufacturer's figure just by making one small change with my ecuXtend made me even happier.

flywheel bhp vs torque
flywheel bhp vs afr
flywheel bhp vs boost

There were three stock 300ZXs all of which were identified by Charles / Dan as being over-fuelled. Mine and Mark's had recently had new O2 sensors and mine had a new knock sensor a couple of years ago. So we haven't found a common fault yet.

By a complete coincidence, Surrey Rolling Road have a Dyno Dynamics dyno. Don't know if it's the same model as Caz used in Australia. And, of course, you can't make direct comparisons on runs done on different days much less half-a-world apart but I'm guessing much of the methodology and technology would be similar..

And here, for historical curiosity, is the very first dyno run ever on my car back in Oct 1999. Ignore the Z31 - that's a mistake.

* Thanks, Spike.