Blitz Thottle Controller will get rid of that lag. I was thinking of installing it on my G.

BLITZ POWER SITE / THROTTLE CONTROLLER


YouTube - Blitz throttle Control

It wont let me embed the video from yuotube for some reason

You described my symptoms EXACTLY....and I have no mods at the moment. But it's not all the time. I think the hotter the car is (and even outside temps) the more likely it is for me to experience it.

emission and fuel economy

Agreed. Today was another rather hot day (96+) and my oil temps crept to about 225F with NORMAL driving. I decided to get on it, and sure enough, until about 3k RPM's it does next to nothing. I decided to mess around a little, so I turned Synchro mode off. It seemed to help. I turned it back on, and it was also better. However, there was a bit of traffic, so It may have cooled down just 5deg or so. So I am quite certain that oils temps are to blame (at least in my case). 225F or so causes some SERIOUS throttle issues.

Also...if I have the AC running, the symptoms are even worse.

With the A/C running, in part throttle at least, the compressor is syphoning off some power which will make it feel more laggy.

There's a bunch of little issues that might contribute to these driveability foibles (but again, I still see more 09 complaints... hmmm)

1. Hotter ambient temps (summer...) means less dense air, means less power,

2. No throttle cable means less response may be tuned in to improve emissions, ecomonmy, etc.

3. All EFI'd cars tend to have some spark retard on tip in to control torque and minimize drivetrain wear.

4. Some power will be lost as oil temps creep over 230*F.

5. Some power transfer may be minimized when VDC is on to improve traction.

Most of those issues are tunable/correctable...

Its not a tip in issue, though. Like I said before, initial response is there. It starts to pick up, then it faqlls on its face and throws you forward (because you were bracing for acceleration). The engine tries to wind up but there is no power... then 3-4 seconds later it takes off rather violently. It almost feels like it could be a problem with VVEL, where it is stuck in a limp mode then instantly switches over to full power.

Hmm, that really doesn't sound good at all. Almost sounds like a fuel cut, but the question would be what is the cause of the cut? Could be VVEL, starvation or something else. I'm discounting VDC because you said it has happened with it switched off.

Once again, you described my symptoms exactly. :tiphat:

The thing is, it even happens below full throttle as well. Case in point this morning... making a right turn from a stop sign onto a slow road, I eased out of the clutch and gave it probably 25% throttle at ~1500 rpm to briskly accelerate and again... nothing... then a surge of power after a few seconds of absolutely nothing.

I don't know if it's just me being over sensitive to the serious lack of torque in the 370Z, or if something may actually be wrong. I need to get the car on a dyno and probably see if I can drive another Z to compare the dynamics... Not quite sure what the hell is going on.

Above 4k RPM, though, the car feels like a champ.

I don't understand this. I have a 2009 and I don't have this problem.

I have uber precise pedal response. a couple of months ago I had this problem slightly with the revs going higher around 4th gear but the car not accelerating for a second.

but now it is HIGHLY responsive. dear lord I can make the car shake all around while playing with my gas because it responses so hard

When I put the car in neutral and hood up with stereo, A/C off (so I can listen), I press the pedal down and I can hear a "woosh" of air being sucked into the intake, but no response for a couple of seconds. Again, I would like to point out that this is occurring only at temps ABOVE 220F.

Again, this isn't a pedal response issue... this is something else. Pedal response on the car is fine for me.

I know but the point is, I don't have the lag the people here have and I don't understand why.

is it because I got the AT?

Time to make a video and post it. Flooring it at 1500rpm will certainly have a sense of lag as the revs build a bit.