First of all, this is my first dyno so I don't have a baseline dyno on my car, but the dyno place, Technodyne, had several stock 350Z dynoes in its computer and I compared my numbers to that.

I was only able to pull two pulls at the dyno, but each dyno showed gains, but not that much. My first run was at 243.6 hp w 224.8 lb-ft torque. The second was marginally better at 244.9 hp w 226.7 lb-ft torque. One of the saved stock dynoes showed it at 227.6 hp and 217.3 lb-ft of torque, so overall I've gained just over 17 hp. The tech who administered the test said that instead of adjusting 15% for crank loss I should just add about 40hp and I would be sitting at 283 hp. I trust his word: they specialize in only Porsches and BMWs. I'm pretty sure with a few more runs I could've hit at least 250hp.

BTW, I have CAI, exhaust, headers, grounding kit, pullies, and plenum. Next up is twin power and iridium plug connection.

 

I don't think that it sounds right to just add 40 to the #, that means with ALL the mods you have you are only seeing 283 at the crank???, it is rated at 287 STOCK, so that doesn't sound right.

I have understood that the % is the better way (40 is way to random of a #, so does that mean a 100 hp honda looses 40 as well as a 500 hp viper??? Doubt it)

 

You should never use anyones baseline as your baseline. Every car is different.

Anyways, for all those mods, that whp sounds low. Then again, we don't know what your baseline was.

 

rodH, here's Juztin's dyno thread:

https://my350z.com/forum/showthread....threadid=39428

My numbers are corrected, just like his, which is what the tech was also doing as well. My numbers may be a little conservative, but then again, it is also 113 degrees and below elevation in Phoenix, AZ. Also, I highly doubt with the mods I have that I would be putting down anymore than 283hp to the crank.
Also, be advised that you also have to had 40hp to the crank number as well. So that would make it about 323hp to the crank.

I wouldn't say it is too random of a number, but I can always go to them and see if they have a dyno sheet from a Viper and a Honda to compareand see if there is a hp loss that would end up being close to 40hp.

Like I said, these guys have been in business for several years and they only specialize in BMWs and Porsches, so I would like to think that they know what they're talking about.

I know I shouldn't have used someone else dyno, but I'm willing to bet that stock my car would've put down the same numbers. It gets real hot in AZ as I'm sure you're aware of.

Also, if you look at the above thread of Juztin's dyno, you'd see his car and mine are virtually the same and put down the same numbers. Bolt ons are not going to net that big of an hp change on the car. Where it's at now, I'm happy with my setup.

 

323??? I thought 244 rwhp+ 40 hp loss at drivetrain=284 @ the crank?? Am I understanding it wrong??

(in other words, people typically dyno about 235 HP rwhp + 20% drivetrain loss ends up around 287hp at the crank as claimed by Nissan)

btw, GREAT point about dyno ing in AZ, I wasn't thinking about teh 112 temps-OUCH

 

Realize again. Every DYNO is different.

I dyno'd X at a local dyno, when he moved and made his dyno IN GROUND. Note same dyno and everything, I dyno'd X-20.

If dynos aren't properly calibrated, etc... you will see a HUGE variance.

 

Ever dyno is definately different, I dyno'ed my car at Paragon tuning, and now I'm going to be dyno'ing my car this monday @ 5pm over at Mile High Dyno Pro's (www.dynopro.com). The baseline will be three runs instead of just the one run I did @ Paragon. Dyno's arent cheap but hopefully I can get more of an average in power gains from the mods on the car so far both uncorrect and corrected

 

sounds low

 

I don't know of any shop anywhere in the USA that doesn't quote corrected dyno numbers. So all of these arguments about temperature or elevation affecting dyno results sound a bit crazy to me. Those factors should already be rolled into the results the dyno shop gives you. I agree that typically you can get your raw uncorrected numbers, but you usually have to request them. On Dyno Jet graphs, you'll see a CF=1.xxx value below the graph indicating what correction factor was used. These are typically calculated automatically by the dyno, but you have to watch these because they can usually be manually overwritten possibly to make certain upgrades look better than they really are. Shops or manufacturers that aren't so trustworthy may use this approach.

One comment about Juztin's dyno results, he had ~240whp in Denver... at 5280ft elevation. These were uncorrected numbers. For his run, the correction factor was ~1.25, meaning that he was putting down ~300whp with those mods AT THE WHEELS (adjusted to sea level and 60F). Now you can add the additional 15-20% to get crank HP due to drivetrain loss.

Maybe the shop cbsuper dyno'ed at reported uncorrected numbers and they were trying to say the corrected numbers should be 40hp higher. I dyno'ed my G35 in Phoenix on Friday and my correction factor was ~1.08. It was something like 89F and our elevation is 1000ft. If cbsuper dynoed at 113F, his CF would be higher, but I don't know how high.

Does anyone know of a good link for calculating these correction factors? I just ran across this one:
http://wahiduddin.net/calc/calc_hp_dp.htm
but it's not as good as I'd like.