Gas Pedal Delay

KillerBee370

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...

cossie1600

How low were you going, 1500RPM?

Jordo!

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...

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RCZ

^ 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...

m4a1mustang

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.

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KillerBee370

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.

KillerBee370

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

cossie1600

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.

Jordo!

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!

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david712370

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.

DIGItonium

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

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j.arnaldo

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?!

m4a1mustang

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

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cfleming2226

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.

GZ3

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