Yeah, that would be umm... BAD.

Argh... Opera Mobile fail after trying to post the last message.

Please excuse my ignorance. Does anyone know if the IAT is integrated to the MAF? Perhaps IAT is getting heat soaked causing inflated readings by the ECU. Has anyone attempted to use an external IAT and relocate it elsewhere?

If MAF was an issue then I would end up with rough idle and maybe get a CEL, but there isn't any and the engine idles smooth. I do notice performance is worse off the line on a warm day after being stuck at the light for awhile, which is why I lag getting through intersections and making turns. So maybe IAT is reading higher than normal, and the ECU is responding to the inaccurate readings.

[EDIT] Eh, I feel stupid.
http://www.the370z.com/engine-drivet...-location.html
http://www.the370z.com/intake-exhaus...eed-stock.html

With the turbo kit, my MAF sensors will be relocated anyhow. I'm going to ask Sam@GTM about it... For N/A owners... perhaps it's something to consider. I'd like to see if CAI owners can chime in.

I figured it was integrated. Thanks for the info. It sounds like it's probably not that, but could be. I definitely agree that the problem is really awful when sitting at an intersection for a period.

from experience in the auto repair industry, id have to be very skeptical that the iat temp would be causing this problem. but i have to say, ive never felt a car lose so much performance as it heats up. i mean, 5 minutes after starting up, the car feels like a whole 'nother beast, but after 10 minutes or so, the performance falls on its face, comparatively speaking. ive rarely had the problems you guys have had, but i can certainly attest to the performance falling as temps rise.

side note, i wonder if wiring the fans to run all the time would help lower the underhood temps. sure it isnt going to run at optimum fuel economy, but it may help a ton.

I apologize if this has already been mentioned, I haven't had a chance to read this whole thread and only started following it about a week ago but has anyone reported these issues with an oil cooler? I read that this isn't really related to oil temps but I'm wondering if an oil cooler keeps the overall engine temps low as well and helps avoid this issue?

nope, even guys with oil coolers have it.

Did lots of searching and found this site... the creator basically has this huge rant against Nissan/Infiniti lol.

Home Page

Wow. That makes me a little sad. And I bet ALL of that could be fixed by ECU programming.

Sorry but that guy is an idiot. :rolleyes:

Considering the problem occurs at any oil temp, an oil cooler shouldn't really make a difference at all.

It's sad. But I do agree with Chris, that guy is an idiot.

I do believe all of these problems could be fixed by ECU/VVEL programming but we have to get cars on the dyno with full diagnostics running to figure out exactly what is going on.

What is this "we" you speak of?!

I drive a 5.nism0 :bowrofl:

So far it seems like no one has had the MAF sensors diagnosed or replaced. How about the pre-cat O2 sensors?

on any other fuel injected car, i'd say no way would any of those cause this type of problem, but seeing as how the vvel system in the new z is very different, it could use these sensors in a different way that could create a problem.

dont forget too that this is nissans first attempt at this type of engine. they still will need time to work out all the kinks.