but it was SAE corrected....didn't hurt me at all...come to think of it, the high was about 80degrees that day, we started at 8am, temp around 68 then.

 

Anyone figure out how to see the correct torque numbers? Mine are bogus like everyone elses.

 

Mine are fine. Make sure you have the right smoothing and correction.

 

The morn. people dynoed higher last time I believe as well. It was only 80 out but inside with cars going WOT every 10 min the exhaust gases warmed the place up. Not anyone's fault just trying to explaining the temp reading on the dyno charts.

 

Let me try and help with the graphs:

When we had the most recent dyno day in Socal, I had all the runs emailed to me by the shop owner. I had the same problem with the torque being off, and max HP being lower than what it really was. Here's what I figured out.

If you plot torque vs MPH, you'll get the large torque spikes and dips. But you will get to see the torque through the entire RPM range, and therefore you can see the HP throughout the entire RPM range.

If you take the exact same run, and plot torque vs. RPM, once you get the torque spike, the graph stops. So if you have a torque spike at 5.5K RPM, your graph will stop at that point. So your max HP on that graph will be reported as whatever the max is UP TO 5.5K RPM. If your true max HP was at 6K RPM for example on that run, it won't show up.

Here's some graphs from the SAME run.

HP vs. MPH (you can see where the graph has spikes). I didn't plot the torque, but it basically spikes where the MPH dips suddenly. Max HP here is 248.


Here is the same run with RPM on the X-axis now.

Notice how the graph stops where it spiked in the previous graph, at around 5.9K RPM. Therefore my max HP is lower in the second graph, because the true max HP lies beyond the cutoff point. It's 240 vs the true max of 248.

My solution to this, as seen in the first graph, was to use the double plot view, and have HP vs MPH on top, and RPM vs MPH on bottom.

Anyway, I'm looking forward to seeing the compilation.

 

The SAE corrections are only half the story. It makes corrections based on changes in the air oxygen density but the ECU is also watching the air intake temperatures and making changes to the timing accordingly.

SAE corrections are a great help, but they cannot account for any timing adjustments made by the ECU.

 

Is there any participants of the dyno day that have not received their dyno runs via e-mail?

Please PM with your correct e-mail address if you have not received anything.

 

I can see Todds conditions being bad, in only that he didn't warm his car up prior to running and he left his big wheels on, but he went b4 i went....about 20 minutes.

Ive really been trying to figure out this ECU reflash thing, I want to know if that was the condition he was talking about. If he wasn't seeing any gains with his mods because of the ECU, then maybe Scoobybri's plenum spacers on his 05 should add power but he didn't reflash the ECU. Do some cars need this done? From what Ive gathered on the Z forums here http://www.my350z.com/forum/showthre...engineer+phone , it is possible.

 

The more mods you have the more it screws with the ecu. Lets say the guys with the spacer gained 5hp. Now lets say he put on an intake, exhaust and test pipes, he probably gonna only see another 5-7hp gain because the ecu doesn't like the new mods because they are bad for emmisions. Individually the computer won't mind to much but put them all together and you get screwed by the ecu. It will pull timing and adjust air and fuel distributoins to maintain emissions. There's another good thread on my350z right now that all these things are being talked about.
http://www.my350z.com/forum/showthread.php?t=122214

Right now I'm reseaching the new unichip unit that came out. If I decide against it I'll being doing the TS fash like Chris.

 

1. My wheels killed my power output, plain and simple. I knew they would but I wanted to see how my car was running on a day to day basis.

2. Chris will, from this day forward, be known as two-tenths.

3. The Unichip (on NA applications) is a fraud, scam, and complete BS Matt. I can send you several threads showing other G35 drivers who gained virtually nothing after spending $1000 on tuning it on NA cars. We'll talk next time we're at the track together, but unless you're running a TT or ST, you'll want to stay far away from the Uni-Flop.

4. SAE corrections factor in temperature changes. Temperature is not a variable where running early in the morning will make any difference than running later in the afternoon.

5. Chris is doing a set of post TS ECU reflash dyno runs and I'm going to Next Level with him (if he calls me and gives me a days notice). I wonder if he'll LOSE 0.3 rwhp after the reflash...

6. Only Sean can be more pissed than me about his car "misfiring all over the rpm range" according to Jeff at Next Level Performance. That was DEFINITELY the biggest disappointment of the day for me. About 5 people asked me if I was alright after Sean's run and not one of you knew why I appeared to be so bummed. I really wanted Sean's car to be the "car of the day"...

I wonder if Adam could take off his stock 17's and put on my PIAA's and redyno... I'd love to see the hp/tq drop and try to see how much of a factor that would make with his sedan sleeper. I just wonder why he isn't running faster times at the track.

 

Thanks Todd. I'm looking at the positive end of it. I have a problem that I didn't know about before. Hopefully it can be fixed without to many problems.
Operator error

 

What can I say... vanity is causing your hp lost!!! dont see me running expensive 19" piaa !!! As for the track, I admit I am a noob in it. No shame in my part, I can only get better at it.

 

The guy with the spacers on his 05 gained 1rwhp and lost 1lb/ft torque I believe.

 

Temperature from 90 to 60 difference is really only going to make a 5whp difference. Also, wheels are only going to make that 5whp difference. SO if you were to dyno in December with stock wheels, you probably on a GREAT day gain 10whp from what you ran this past run. Just some FYI for you guys.

Any way you guys can post a master list of everyones mods with their highest runs of the day?

 

Didn't it just recently come out? When did these guys get it. It's got a money back guarantee.

ps. holy crap did Josh just make a post? lol