are you guys just stomping on the throttle with low revs? this isnt a corvette.. Mine only ever does it when I stomp full throttle at low rpm. That's normal though..

I get what you are saying and yes my issus comes when I floor it at low RPM's. i'm not expecting it to take off as a Corvette would, I just found it odd that there was such a delay in anything happening. Heck, my FX 35 would respond faster in the same situation.

No perceptable delay on mine.

'09 or '10? Might be slightly different ECU logic?

Any mods? Intake or exhaust might throw off tip-in fueling.

EDIT: looks like a lot of folks with this issue have intakes. Yep, either by throwing off MAF signals or actually drawing in more air and running leaner, tip-in will be affected most noticeably.

On tip-in, the ECU will add extra fuel for smooth transitions from one location in the map to another. You should be able to get that tuned -- but it will have to be ROAD tuning.

I don't think you can adjust tip in effectively on a dyno.

My girl takes off when I floor it. I can 100% agree with the oil temps affecting response though. It's incredibly dramatic. Below ~220F, the car accelerates like a banshee, but above ~220F it gets progressively more lethargic. Thank God my oil cooler is on the way!

The drive by wire/ECU mapping creates a slight lag at the lower RPM, the only thing you can do is flash the ECU. If you have driven a 350z, you will know the 370's throttle response is not up to par.

I get this after I floor it and then come to a stop and try to accelerate again. Almost as if the car's going to stall. Strangest thing. It goes away after a bit like the computer is resetting or something.

Very frustrating to say the least.

No, the ECU tune to improve throttle response doesn't fix this (I have the tune). It fixes throttle response alright which is a must in this car however that's a whole different thing.

Very frustrating... did I already say that?

Edit: for some reason at the track under massive constant throttle I don't get this. Hrmmmm...

How low were you going, 1500RPM?

If not due to poor tip-in tuning or oil-temps, then I have to wonder if there's a a '09-'10 difference in the ECU logic.

Other possiblities would be slight variances between vehicles in the TPS sensor interpolations which cause intermittent delays.

Possibly, dirty MAF sensors/clogged airfilters throwing things off a wee bit -- more common in cars with some miles on them, driving in dusty locales?

After that I'm wondering more or less common for AT or MT?

This isn't voodoo -- it should be something one can narrow down and address with a re-tune or a bit of cleaning...

^ I think I know what you guys are talking about and this isn't the only car where this happens. It always feels better to roll on the gas than to just stop it to the floor, right? I know the problem and I get a feeling it has more to do with the way the ecu does the fueling and plain mechanical inertia from the low RPM's...

Those of you that described the problem...what RPM are you stomping at? under 2500rpm? If it is, then its normal and possibly built in safety to protect your drivetrain...

For me its anywhere under 3-3.5k. It just doesn't make any sense (to me anyways) to build in 2-3 seconds of zero acceleration as a safety. It doesn't really matter if I go WOT either. If I'm accelerating from a light and at 2500-3000 I decide I want 50 percent throttle the same thing happens. The car just dies and does nothing, then 2-3 seconds later it takes off. Doesn't seem like a safety to me. Need to check some things out this weekend... probably need to log my a/f ratios to see if they are out of whack in the lower ranges.

Yeah it doesn't seem like a safety thing to me either. The best way I can describe it (if indeed I am experiencing the same thing you guys are) is that when you are driving at a certain way for awhile, let's say normal cruising, the ECU picks up on this and adjusts itself to give the car the best possible mpg etc. for that type of driving. Then if I were in say second or third (or even from a dead stop) and decide to stomp the peepee out of it, it goes like a bat outta hell without issue. THEN upon bringing it to a stop or returning back to a lower gear and normal driving, it will stutter a bit when the gas is applied (either from a dead stop or rolling in any gear).

What leads me to believe that it is an ECU thing is that it is consistent. In other words, it doesn't seem like a random problem such as dirty sensors or bad gas or something of that nature. This would also explain while at the track when the consistency of the driving is constant mashing of throttle etc, it wouldn't do this because the computer is setting itself for this particular type of driving.

Does this sound similar to what you guys are experiencing? It's probably a normal function of the computer but i find it a bit frustrating during spirited driving to yield to electronics rather than just have the car do what you want it to regardless like an older car would without drive by wire.

I will take it out and see if I can video the problem and post it here.

the 08 09 sti had the same problem. as i said, it is a byproduct of the drive by wire/emissiontuning. it has nothing to do with oil temp. if you think your car is fine, try driving a 350 to compare. the tuner should be able to adjust that easily.

this is very noticeable for guys who autox, i think the throttle gets more aggressive as the rpms go up.

Hmm. Well, those of you have this issue (especially those who have aftermarket intakes and no tune), definitely see about spending a little time on the road playing with tip-in fueling.

Best way to do this is big open parking lot (stop and go with various degrees of throttle input) and then empty road to play with this at crusing speeds.

PITA to tune, and pretty much all done by feel (i.e., there is no target AFR per se, it's just what feels good -- typically this involves skewing a tad rich momentarily, although ideally it would go directly to whatever AFR you would have in next map cell).

You should also be able to tweak tip-in ignition too, which will make a huge difference in responsiveness. Torque output restrictions on tip-in generally involve pull timing.

Put it back (with a slight risk of burst knock, so be careful!)and you will get way better responsiveness!

I noticed this problem as well in my manual. I tried turning off the VDC with no change. However when i turned the rev match off it appeared to make a difference. I am wondering if I am just imagining the difference, since it doesn't make any sense to me while it would help with the throttle response. Has anyone tried this?

Also, I have no mods and I can report similar issues with a delay in acceleration below 3k. Just my $0.02.

This is embarrassing to say. While I was in Houston, I briefly drove my gf's mom's Corolla. I nearly peeled out because the throttle was so sensitive, so I kept jerking the car around for a few minutes. With this throttle lag, I see these cars "launch" quicker than mine from the light during normal acceleration. If I give it more gas and delay the shifts, then I end up with unnecessary attention :P

My '04 Touring Coupe reacts immediately to my shoe, Fleming---one of my favorite qualities in my 287hp baby! A 370, with 332 ponies should do even better! Is the problem over, dude?!

Unlike the 2004.5 350Z, the 370Z is not F-L-A-W-L-E-S-S.

WEll its not temp I was pretty cool yesterday when I tried to get a Corvette to race me (lol), floored it and again the delay (really should have downshifited with the paddles). I am pretty sure this is being caused by the delay in the computer to the trottle responce. I believe my RPM's and gears were the same both times this happened. Prob. just need to get use slowley excelrating rather then punching it, at least when using a rolling/moving start, theres no delay when punching off the line.

Think I am going to play with it more this weekend and see if I can pinpoint the RPMs where this is happining.

so what year 370z are exp this prob...09 10?? I haven t noticed anything..YET in my 10'

09 1500 miles on it

I don't have this problem. and I have done what? 15000+ miles on it.

the only time it does that if VDC is being a nanny

2009 with 11,250 miles. It is not a temperature problem-happens well below 220.

Ive lately noticed this happening to me too. Ive got an 09 with 13k miles on it... definately laggy around 2-3k and then a sudden surge in power, always thought it would be the oil temp but it does it below 220 too.

Same thing on my 08 G37 Coupe 6MT, put your foot down. Car starts, pauses, then accelerates.

mine is a 2009 doesnt seem to do it

Stab your throttle real quick and back off in netural, you will see the noticeable lag

Hmm. Sounds (anecdotally, anyway) like a more common issue with 09's. Nissan might have made some sort of minor update to the TPS logic on the newer ECU's.

I wonder if it's a problem in the first batch of 09's and was corrected mid way through -- any TSB's on that?

Well, fwiw, seems like we are talking about a couple different things here. One is throttle input lag, the other is where the car responds to throttle input but doesn't accelerate.

Agreed. I have an early '09 with 24k+ miles on it, and I notice a slight lag if you stomp it and let off. But the other problem being addressed is a SERIOUS lack of response. I have never seen that on mine. I had an '07 350, that was VERY responsive.

This

All Toyotas I have driven do this as well. Even my car has the same problem y'all are mentioning. My mom's '08 F-250 does this HORRIBLY. If you floor it while moving, it will take a good 5 seconds for anything to happen.... I don't think this is just a 370Z thing.

Don't seem to have any lag.

Oh, forgot to add.. 6MT

Get a tune if you don't like the delay

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.