Gas Pedal Delay
 

Has anyone experienced a brief (about 3 - 5 sec) delay from the time you push down on the gas (floored it) to the time you actually accelerate?

I was out the other day about to merge (Honda with a tin can exhaust next to me) so I floored it to jump ahead of him and there was a good 3 sec delay ... really disappointed. Especially because in my head I was gonna own this guy, but by the time I accelerated I had to slow back down to let him in!

I get the same thing, which is why I gradually press harder, instead of just flooring it... The delay is kind of an annoyance... Apparently the computer's reaction time from signal input to throttle response is not at the speed my mind wants it at lol.

I guess as long as its not a problem with the car I will adjust ... i just really get a kick when it tosses me back in my seat, and with I can make "racers" look silly!

Thanks for the responce!

just be careful...don't want to draw unnecessary attention to your car

I notice you are in an auto, I'm guessing you aren't in manual mode at the time? It probably just isn't downshifting when you want it to. I have that happen sometimes, but usually it adapts pretty quickly to your current driving style. Or just switch to manual when you want to boogie down. :happydance:

Try turning the VDC off. VDC may be delaying the throttle response to prevent the tires from slipping. But once you turn it off, have fun crashing into a curb.

The world of emission and drive by wire, the computer opens the throttle gently rather than snapping the plates open for emission purposes. I have been saying that the 370 feels like it has less throttle response than my 350, I am starting to think I am right

It is actually faster in AT to floor it. since if you want to floor it in MT you need to put the gearbox in manual and then down shift to the right gear.

while in the AT mode you just SLAM your foot down and it instantly shifts to the lowest possible gear.

I never had this kind of delay other than the gearbox shifting

isn't that only if you did it in regular D mode, if you were using the paddles (which i would imagine you would be if you were flooring it), it'd be the same.

I actually merged yesterday, and after i was at speed i realized i didn't even remember downshifting before i floored it (which i most certainly did)

any way to fix this problem?

Yes it's fixable through tuning to have the throttle open quickly rather than delayed.

I have never used this personally but I have heard good reviews on it...One of the reviews came from one of our engineers who tried it out on his wife's BMW...

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Not sure if it was adding the nst pulleys or the up rev tune but no delay anymore.

Shouldn't a tune take car of this? I get this too when I try to go from a low rpm in first or second gear... the car falls flat on its face before surging forward.

You can recalibrate the throttle tables on your ECU to make your throttle response faster.

I did that, the car is alive now, and feels like a real sport car.

Is that done just with UpRev or some kind of tune?

Check your oil temperature. Sounds like you might be going into "limp" mode. Mine has the same problem when my oil hits 220 or so. I also stall out if I let out on the clutch at my normal speed.

Yea I hate the electronic throttle on the 370Z, first gear especially can be herky jerky with the lag delay...the 350 had much more direct throttle response. So this can be reprogrammed via AccessPort?

Say what?

OK....the throttle plates close on the 370Z under what conditions??

I was under the impression that the ONLY time they closed was at idle and during deceleration. That's what VVEL is all about I thought. Throttle plates remain WIDE OPEN all the time and the amount of air getting into the cylinders is controlled by the VVEL, hence no real need for throttle plates (other than for emissions).

My 6-spd S/P has never had these symptoms. I noticed a delay in power only when the slip light illuminates because it detects slip. Otherwise, mash it to the floor in any gear and it instantly goes.

Late,
Trav

Bingo.

Even on my automatic, I haven't seen where it isn't opening up. What I have seen is when I've floored it and it doesn't downshift immediately, but of course this only happens when not in Manual mode. This only happens under certain conditions (not exactly sure what conditions though).

Interesting. I need to get a video of my car... If I give it throttle in 1st or second gear under 3k RPM it just bogs down and literally does nothing for a second or two... then it goes.

It's kind of funny because it throws me forward as I'm bracing for acceleration (it starts to go, then stops... waits, then goes). It's NOT VDC I can tell you that.

Been toying with putting the stock intakes back on the car (and exhaust if necessary) to see if any of those are causing a problem, but I should probably just get the thing tuned.

Now that I think about it, it behaves as if the car isn't picking up any fuel... I wonder if it could be a pickup issue?

I have the exact same symptoms. Its very annoying.

I'm glad I'm not the only one. It's honestly a dangerous situation. There have been a couple times when turning right from a red where the car just WOULD NOT move when I needed it to. Very frustrating.

Hell, even taking off from a light sometimes I bet I could get taken by a Prius.

that is the exact problem I am having (even with the bracing for take off, lol) I do notice my temp is running 220 which I have read is a problem, so I am unsure if it is throttle response or an engine safety. The more I read about the temp on the Z's the more it is worrying me, as I live in AZ where it gets pretty damn warm in the winter, and flat out hot in the summer!!!

Limp mode shouldn't be an issue until 270ish or wherever it kicks in. 220 is a fairly normal operating temp... shouldn't be the culprit here, although you can feel a difference in power between 220 oil and 200 oil, for example.

Yes, it's just ECU mapping.

I agree, I had said my 350 felt faster than my 370 at the low end

Sounds to me more like self induced limp mode, so to speak.

Yeah, when oil temp gets just above 220, I start to lose throttle response. So I guess it's not a full limp mode; but there is a NOTICEABLE lag between when the pedal goes down and when the engine responds. At lower temps its just fine.
I was going down the road and a 'stang wanted to go. Took him from 2 moving starts, but as soon as we got to a red light, my oil was already over 240. I knew it was over at that point. I didn't stand a chance.

Definitely not. I had somebody else drive it until it hit 220, then had him drive it hard for a couple runs. He was shocked. Then he was doubly shocked when I told him to look at the oil temp gauge. He's a Ford Mechanic.

I tuned it with COBB. Don't know if you can do it or not with UpRev.

I've never experienced that outside of fuel starvation. Were you running at or below 1/4 tank?

If it was VDC you would have constant speed (no acceleration) but if it is fuel you will get deceleration as if you had lifted completely off the gas in gear.

Probably not fuel starvation, then. I don't think it's VDC because the light never turns on and I'm pretty sure I can replicate the problem with it off. I'll have to do some testing this weekend and report my findings!

I noticed this started happening after I installed the injen intakes. I think you need to get the car tuned because I used to have the same problem. The A/F ratios were way off on my setup and now its 98% gone cept when it gets rediculously hot out but thats going to happen either way when its 90 out.

That could be it. I might take them off and see if I still have the problem.

So it the general consensus when the Oil Temp gets to 220 performance goes downhill and I should expect the delay? I am running at 220 all the time, as its 100+ out every day and soon to me most nights, gotta love AZ.

That's not really consensus. Oil temp shouldn't cause the type of delay we are describing. Yes, at 220 the engine will not be as powerful as it is at 200, but it shouldn't fall flat on it's face when you punch it either.

Doesn't seem to be consensus, but I still feel that could be it. m4a1mustang, it doesn't sound to me like you have experienced this first hand either. You have to feel it and experience it to know what I mean.

I do know there is a lack of response (read: noticeably less power) when the temps are higher, I just think what I'm experiencing (2-3 seconds of NOTHING, even with the throttle floored) is unrelated as it doesn't matter if the car is cold or hot... it won't go.

I'm thinking it might be related to the intakes as Daishi suggested. Will have to do some digging this weekend to find out.