For me, my shifts were always smoother with SRM off. But you're right, it's fun blasting around some curvy roads. It makes you look like a pro... and helps you focus on the corners ahead instead of matching your revs perfectly, but that's half the fun.

slightly off topic but 4 minutes till im off work and have the whole weekend to enjoy my car!!

nice to hear someone say they are going to enjoy their Z, the current trend seems to be to bitch and moan and whine about every small thing... :tiphat: to you sir, im going to do the same!

LOVE your signature... I swear his character is one of my heros. :tiphat:

awesome!

The weather is very nice with temps in the low 60s. Oil temps barely touch 200F from a whole day of driving. I was leaving from volleyball practice, started the car, and the it felt very good. Acceleration is smooth and quick without requiring much throttle input. After driving for awhile I started to bog the car more than usual as if I'm not giving enough gas when engaging 1st. I even killed it going in reverse. I made a left turn and tried to give it more gas and let it rev past 4k, but the car felt like it was struggling to move. The car felt like it had the power of a 4cy sedan going up a slope, and the acceleration was pitifully slow. Throttle response is fine. I can inch back and forth on it, and it responds immediately. It just has no power to move.

Therefore, I believe the engine is losing power after awhile regardless of oil temps. It idles fine, revs fine, but it literally has no power. The car felt heavier than usual. Turn the car off, let it cool for a bit, and the power comes back on tap for several minutes of driving before losing power again.

This explains the phenomenon of why a Hummer, Corolla, and even a G37 can casually out accelerate me through an intersection even if I gave it 50% throttle.

I never said anything about it because it was pretty embarassing, but I got out-gunned once by a Prius at WOT because the car just wouldn't go without a 5k RPM clutch drop. :(

i definitely notice the power drop as the oil temp climbs, but not at that drastic a level. Maybe you guys just suck at driving, haha, j/k!

Haha... I'm not convinced if it's completely oil temperature related. I'm not much of a gear head, but I did some search on lack of acceleration and loss of throttle response. There were a few posts about faulty fuel pump. One member here suggested it as well.

I'm planning to get TT this July at Baker, and I believe the install process involves getting new spark plugs and upgrading the fuel pump. I'll get back with you guys later in July.

YES! THIS! It feels VERY heavy. Temp has little to do with it I'm sure now. (I was quite convinced it was before). This happens with in city driving more than highway. I've had my car stall in reverse and first, and nearly stalled it several times since last summer due to complete lack of power. I know your feeling very well.

yeah, that ive never had before.

so i tried driving with the SRM off and yeah there is a difference with the SRM off. The engine responds when shifting up much quicker. However at the same time you miss those perfect blipped downshifts. I am ok at doing it but not as good as SRM.

its a hard decision to make sometimes but the car is simply great either way.

im saddened by the problems some of you are having with yours

I'm even more sad :shakes head:
On another note, the tech that I worked with several months ago said he was going to call me about the 3rd week of march. Hopefully he can quantify the problem.
Again, I am encouraging those of us with the problems to go to Nissan about this. It needs to be heard.

any updates...am having this problem now...Feels like the car is accelarating out of 1-2nd gear using 5 or 6th...its happens only after a drive and the car is warm...fresh and cool in the AM it feels good. I also noticed that the exhuast note changes when it starts doing this...gets louder....feels like the car is losing "acclerating pressure" if that makes any kinda ******* sense...when this happens i starting hitting the throttle repeatedly 6-7 times in a row within 2 secs or so and it kinda corrects itself but still feels diff. I'm one of those people that has ZERO patience for BS like this, especially when there is no code or obvious specific factor....if this doesnt come to fix soon am trading...getting a KIA and procede to save for a GTR

FWIW, intake air temps climb dramatically when you sit traffic in warm weather. Even in 40F weather, my IATs can go up to 140F. On a hot summer day, my guess is they go even higher and that really hurts performance leading to this 'lazy' feeling when driving around town.

This problem is exacerbated in the D.C. Metro area due to the high levels of hot air coming out of Washington. :shakes head:

i thought there was poor traction in the DC area due to the high amounts of :bs:

Well that's the issue I am having with the 5.0 right now. :icon17:

Dude i was at the FORD yesterday looking into a white 5.0 base...they didnt have a 3.7, and they didnt want to give me enough for my trade, but i was sooo close to doing it....if they would have offered me another 2k for my Z i would have been all over it. Ever since this throttle gas pedal delay crap started i've been exploring my options...lol ...i had juust made peace with the high oil temps...now this....i may just got super chaep, get a kia, and save for a monster

no your problem is that live rear axle setup from 1945....:ugh2:

:bowrofl: yeah i can even feel the effects all the way down here in florida...

Anyone drive a 350z after their 370z? The 350z feels so good as far as gas pedal goes....it does what its told....it puts the lotion on its skin.

Its so ******* pretty

Nope I would not go back to my 350. My buddy even has a newer 350 than I traded in and i still love the 370 more. Just gotta learn to drive It. It drives differently. However i am not experiencing the same problems as some others are

I had something interesting happen today, hopefully relevant. I was on my way back from the grocery store, and got a code. Hooked up my reader, it says "catalyst system efficiency below threshold". After talking to a couple people and reading online, consensus is that it's either O2 sensor(s) or catalytic converter. Since O2 sensors are directly related to fuel delivery, I hope there is a relationship to the throttle response problem. However, I have almost 40k miles, so I've passed the 36k warranty. So my guess is that they are going to say no, it's not a warranty fix. IF that's the case, F**K them, this car is GONE. No reason for EITHER of these to go bad with less than 100k miles.

At my autoX last week, the car was bogging badly off the line. I had to launch above 3k RPM and then the throttle/power was fine. But anything less, the car would fall flat on its face. Never had that happen before. Ambient temps were in the 60s and my IATs were between 90-140F.

Easy, federial law requires the maker Nissan to keep your car in emission standards for 50K. Dealers dont want you to know this, it includes cats, O2, and any codes related to them.

Give it a try, I had had friend get a new ECM after the car would not come out of limp home mode. Out of 36k warrenty (under 50K) but could not pass emmisions. Only snag may be the Florida has no state inspection.

That's what I see with everyday driving when it starts losing power off the line. I try to rev it past 3k RPM regardless of how much throttle input, but it has plenty of power down low to get moving when it doesn't exhibit this issue. I see you have an oil cooler, and it's not helping all? I still don't buy into this oil temperature being the reason for the power loss because it happens around 180-200F as well. [shrugs] BTW, is your ECU program stock?

Didn't know that, good to know and makes sense! And you're right in that FL doesn't have an inspection, but I'll try to push it. I already have an open record with Consumer Affairs too(not that THAT has helped much).

the catalyst code means that the change in chemical make up of the exhaust the computer is looking for between the pre cat sensors and the post cat sensors hasnt changed enough. This is usually a cat problem, but sometimes can be a sensor problem. Dealer diagnostics are usually required to get to the exact root of the problem. The 50k laws shouldnt matter between states because it is a federal law, i'd try that route.

You could always trade in for a 5.0 like everyone else seems to be doing!

It happened to me, first time in 9K miles, usual day,usual road, sucked

Dropped my car off this AM, just got a call. They said that the catalytic converter is bad! WTF?! This actually warrantied for 5 years / 80k miles. Still, a cat shouldn't go bad at 40k miles.

It shouldn't but sometimes it happens.

I'm still skeptical. We'll see though.

Cant see that... wow, I run with TP's and I got it :tup:

Like to see the Nissan tech enjoying cat removal

Do you use SRM at all or all the time?

I have a feeling that SRM throttle position overrides actual throttle position during a set of time prior to gear engagement.

I believe this behavior is what is causing this lag we all have been complaining about. If we could remove neutral position awareness and allow actual throttle position to override if it's greater than SRM throttle position value, I believe we'd be considerably better off with this issue. :)

I'd like to see if there is a garage out there that can validate if this action is occurring so that we can provide Nissan with data they can action, if the choose to.


When I don't utilize SRM, I don't receive this lag issue at all.

Good thinking... I use it all the time - also VDC off

IcedZ did the "special" tech ever get back to you in March?

Just bought a Z. I don't mind kinks here and there, as long as they are fixable, but if not I have little patience for this sort of thing. Mine hasn't really dogged yet, but I have noticed a jerky acceleration from a stop. Bummer is nothing this side $75k excites me in vehicles besides the Z (not for performance, Mustang GT can match that, more that excited "I want to drive this thing fast" sort of feel).

I have never once used SRM and I still get the lag. SRM on or off apparently doesn't affect the lag issue.

yeah first gear is herky jerky thats for sure...