6spd -

I have read some of the things that you have experienced, and I live in South Florida as well. My oil temp is usually always between 210-220. I believe it takes some power away from the car because its so hot here. I believe Mike (the powdercoater), had an issue similar to this (losing power) and he ended up finding out that it was a problem with his brake indicator being on, so the ECU though the brake pedal was being depressed.

For example:
I was at a stoplight one time and there was an Audi TTS behind me. When the light turned green I let off the clutch like normal and then hit the gas. Started shifting through the gears but since it was so hot outside and my palms were sweaty, I ended up missing 3rd gear because my hand slipped (my shift knob is CF and it can get slippery when its really hot). But I quickly put it in 3rd gear, and I as did that the TTS got in the middle lane on my right, and he actually started pulling on me(We were right next to each other but he was slowly creeping forward). I know I missed a gear, but in the higher speeds that car should not be able to keep up with the Z. Afterwards I looked at my oil temps and they were around 220-230. So I've alwasy felt like the car was kind of "holding back" ever since I've had it. Maybe like Mike, its a brake ECU issue?? I want to find out but I don't want to ask Nissan lol. They might tell me my warranty will be void.

maybe, i dont know. maybe ill play with that one day, but as far as power goes, all cars are gonna lose some as temps go up, but what others are describing is worse than anything i ever feel, save the one time it happened to me above 230. :icon14: wierd.

I had the same problem and used masking tape and some paper as a shimmy. When testing it out my car screamed and spun tires. It was a totally different feeling. I took it in, but the tech said he couldn't move the brake switch any higher and suggested the shimmy solution.

How do I check fuel pressure and the fuel pump? I don't smell any gas and the car never has any hesitation or start up issues. I definitely have to rev it past 3k RPM to get the car going, but under that it feels like it wants to bog especially when I give it more gas.

Any DIY?

All the way back here:
http://www.the370z.com/700023-post137.html

Nevermind, it came back today.

I still experience it with the shim.

Ah yes you're probably right. BTW, my fuel sender went bad. On the next oil change I may have them replace it. Maybe they can inspect the hoses as one of the owners described some cracked plastic hose when removing and reinstalling the fuel pump.

Wha?! Can you give a little more detail... pic or something?

Oh I don't know anything about this stuff other than the fuel gauge not registering full when I fill up the tank. It's a bit offtopic at the moment until I get this issue resolved first.

OK, keep us posted!
I have my appointment tomorrow. Will let everyone know what happens.

Any new news on this. Would like there to be a known cause and/or a fix before I take my car to the dealer. Driving this car when this happens is very dangerous and this needs to be fixed.

Would love to hear what happened, IcedZ!

Sorry about that! Sometimes I just need a reminder...
Not much happened really. The guy came and drove my car for a while with me there. He brought Consult-II with him. He was not able to find anything "quantitatively" wrong, but he agreed there was something not exactly right. His initial reaction is that it is an ECU issue. Nothing came out of this visit. He said he will come back in January with some more equipment. He was very easy to work with and friendly. He gave me his cell phone #.
Hopefully more to come in January some time!
That being said, I highly recommend complaining about this and getting a special tech on your case. These techs are regional and they travel to different dealerships in regions to solve weird problems.

I have followed this thread for a while now, and the more I read I think it is a purposed design. I think that maybe in the same vein that Nissan wanted better MPG and henceforth did not include front brake ducts that would have decreased mileage due to drag, perhaps Nissan mapped the throttle in such a manner that if not fully depressed at launched at a high RPM, the car sips fuel below 3000 RPM. Further that with the torque curves seen in just about every dyno map done on a stock 370z, with a huge dip between 2500 and 3000 RPM, and the hesitation makes perfect sense - not that it does not suck.
It is ironic that a simple fix such as the gadget that increases voltage to the gas peddle is all that is needed to overcome some of the hesitation, but the inherent design of the engine and mappings make it fairly difficult (or at least some serious investments) to overcome.

Car and Driver Investigates Brake issue
Z Meets Wall: We Investigate Why the NISMO Z's Brakes Failed at Lightning Lap - Feature - Auto Reviews - Car and Driver