I didn't mean it like that, I was giving you credit for bringing it to my attention.

I'll disconnect it tomorrow for a couple runs and see what happens. Z33 manifolds don't have a variable induction system.

 

I know you didn't, I was being funny.

 

What's up with your timing? Your ignition timing seem like it's 10 degrees off around 4k RPM. I would think maybe this is contributing to the problem??? Timing seems better at the top end -- only a few degrees shy of mine.

Does your car seem sluggish? When was the last time you disconnected the battery to reset the ECU?

Attached is one of my logs before I installed my UTEC, and after I bumped the timing 2 degrees with Cipher. I had just installed HF Cats (and already had my exhaust, spacer and popcharger). Check out the timing graph.

 

I just installed the UTEC but it's on stock mode. The ECU was disconnected so I assume the tables where cleared. Timing is bumped already.

 

Thanks for posting your log~ It looks like we have similar mods. So I was checking out your WB Bank 1/2 voltages & AFR's. Looks like they're never quite in synch and sometimes the difference spikes by as much as .3 volts (which only translates to about .7 of an AFR point). Mine does this too according to my Consult II logs. It doesn't seem to be a big deal as long as the AFR's are not too lean.

 

Nietzsche, I would guess the issue is transmission related. Look at your speed vs time and RPM vs time graphs in the attached file. Your speed increases linearly but your rpm steps, which makes me think there is slippage somewhere in the driveline.

I'm not an auto trans expert, but I would think maybe torque converter issues???

 

Do you have any logs you can post? How does your data compare with the OP's? (specifically ign timing)

 

You guessed right, after many discussions and looking at similiar runs from other Nissans we came to the conclusion that it's the torque converter. At least I can rest easy until I blow the motor.

 

Hi~ I was only validating Bank 1/2 AFR's on this run... Sorry, we didn't log timing... and the Consult II only has the capability to log in 10 sec intervals (weak sauce)... But here's what we logged RPM/ AFR's...

I'm getting a Bosch WB 02 sensor and AEM AFR Gauge installed this week, and UTEC MAP Sensor, Headers + new tune next week.

 

You already have W/B O2's on your '06. I would just buy the Cipher software and read the W/B's through the OBD2 port.

 

True, but the AEM AFR Gauge (I'm putting it in a pillar mounted gauge pod) requires a Bosch UEGO WB 02 sensor... The OEM 02s won't work.

 

Unless you're FI, a real-time AFR gauge won't do much for you. Under cruising conditions, the ECU is constantly changing the AFR. Under light, steady throttle you'll see the ECU trying to maintain 14.7, and if you let off the throttle, you'll see your AFR spike to 30 as the ECU cuts fuel to the cylinders. It's cool to watch how your ECU makes changes, but it doesn't tell you much at WOT since it's not logging the data to help you tune your AFR.

If I had to choose, I'd take the ability to log AFR data under WOT, since that's what you're most interested in when you tune. Now if your gauge has a button that you can hit to log AFR vs RPM, that would be nice!!!

 

Good info. My ECU keeps trying to wash out my UTEC tune. So I'm getting the MAP sensor installed to take over the Injectors/ AFR from the ECU. I'll be going FI anyway, so (except for NA headers) all mods I've done so far are geared for FI.

 

Good call on the MAP sensor -- I think that's the way to go for tuning. I got Cipher a couple months ago, and have been logging a lot of data. As I've been tuning my UTEC (via MAF), I've noticed that the ECU's AFR algorithm is very complex, and I don't know all the variables involved. I've noticed that it is temperature dependent -- my AFR shifts richer as the weather gets hotter.

Also, with MAF, the load columns are based solely on MAF voltage (or airflow), so the matrix will have cells that are never used: you'll never be in the 20% load column at 6000 rpm, and you'll never be in the 90% load column at 3000 rpm. Actually, I think you have to be well under 2000 RPM to get below the 50% load column.

Keep me updated on the MAP tuning. I'm thinking of trying it, since I've been logging injector pulse on all my data logs. I'm pretty sure I could create some graphs and correlate injector pulse to AFR for each RPM increment.

 

Cool deal! Here's a thread where I8acobra is doing the same thing... The MAP sensor/ tune seems to be the way to go for UTEC Tuned NA's... :-)
https://my350z.com/forum/tuning/268925-got-my-06-tuned.html