I just came back from the dyno. This is a local dyno at addictive racing shop in Tucson. Temp was a little hot and the altitude in Tucson is 2500feet.
The car has 1365 miles and is bone stock. It had 91oct gas because there is not a single gas station in Tucson that sells 93oct.
First dyno was :
452.17whp/421.16 lb-tq
Second dyno was 456.72whp/427.22 lb-tq
Last dyno was 437.27whp/402.55lb-tq
On the last pull we did not wait long enough to cool down and that reflects the lower numbers, temp was in the 220 degrees and the 1-4 shift was displayed.
The dyno operator then showed me another dyno pull from another customer that had also a 08 red C6Z and his numbers were also 456.20whp/ and 420lb-tq.
What do you guys think?, it sounds about right? slighty underrated engine or low drivetrain loss? Either way, I am happy, I was hoping around 440-450whp and 420-430lb-tq.
Last edited by 335itoz06 : 03-28-2008 at 04:53 PM.
Thanks!! I was actually concerned about the heat and altitude of Tucson. I am sure I could squeeze more power out of that engine at sea level and with colder temps. Just my .2c
What made me very comfortable is to know that another 08 red Z06 also made 456whp in the same dyno with 420lb/tq.
I couldn't tell you because I have seen such diversity of strong and weak dynos from the 06,07 and 08s that I can't say the numbers are steady. I have seen fluctuations of 45lb-tq and well over 30whp differences even at same dynojets but again they are not the same dyno, same car, same conditions, same altitude, same gas, etc
Thanks!! I was actually concerned about the heat and altitude of Tucson. I am sure I could squeeze more power out of that engine at sea level and with colder temps. Just my .2c
What made me very comfortable is to know that another 08 red Z06 also made 456whp in the same dyno with 420lb/tq.
The heat and altitude won't affect your dyno numbers much because they are corrected (SAE). Looks like the CF was 1.10, so it's adding 10% to your actual uncorrected numbers (415whp/389wtrq). Theoretically you should make 456whp/420wtrq at sea level .
Please post your dyno results if you can so we can better analyze the power curves. Also, if available, please include on your graphs the O2 sensor's AFR plot. Some dyno shops charge extra for the latter but the AFR is essential to fully baseline engine performance and absolutely key to electronic tuning.
Going back to thread starter 335itoz06 results, he mentioned he dyno'd in Tucson (elevation 2500ft) with 91 octane gas, and the OAT was nearly 90F. You can see how test conditions take their toll on engine performance on the superimposed graphs. First of all those results were graphed iaw "SAE" correction standard. BRAVO! Some dyno shops tend to use the often misleading STD correction factor. This can boost the HP & TQ peaks for braggin rights, but a disservice to the car owner. Everybody should request their dyno results iaw SAE to normalize atmospheric conditions which vary widely from one dyno shop and from one day to another.
If you study 335's three pulls as superimposed there is a telltale erratic fluctuation in the worst pull's result. I'd be willing to bet his engine experienced "knock" induced spark retard which caused those fluctuation in the power curve and a noticeable loss of power (area under the curve).
The other observation in the best two pulls is what shows up slightly above 3500 rpm. There is a noticeable surge in power. Not too coincidentally 3500 rpm (WOT) is when the exhaust is least restrictive because the butterflies are opened. This is proof that in addition to more exhaust sound, less backpressure on the engine "helps" produce more rwhp.
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