throttle lift off lag

Pharmacist · 12-14-2009, 11:17 PM

Quote:

Originally Posted by semtex

Ooohhh....I think I misread your original post. You're not disengaging the clutch, are you? You're talking about a situation where you simply lift off the throttle but you're still in gear?

obviously the car is not in gear, or if its in gear the clutch is disengaged and srm is off. yeah it does seem like circuitry lag due to the electric throttle. all my previous cars had mechanical throttle cables, and throttle response was definitely much more immediate both in opening and closing the throttle

cab83_750 · 12-14-2009, 11:32 PM

My other car does the slow Rpm drop. In researching, it was for emmission purposes.
The unit is called a decel-valve.

Disclaimer: this may not apply to our Zs

spearfish25 · 12-14-2009, 11:58 PM

I've wondered if this does anything to help:

Sprint Booster USA - MT

Seems like it just increases throttle sensitivity on acceleration. No one online really comments on how it would address the issue in this thread. I may go locally and try one out as a demo (offered on their website)

FricFrac · 12-15-2009, 01:52 AM

Quote:

Originally Posted by kdo2milger

circuitry lag

drive by wire

I doubt its circuitry lag - maybe a delay built into the software but not a hardware delay.... these ECU's are very capable.

Island_370 · 12-15-2009, 06:21 AM

Quote:

Originally Posted by FricFrac

I doubt its circuitry lag - maybe a delay built into the software but not a hardware delay.... these ECU's are very capable.

I notice it as well. If there is a delay, it is programmed for a reason. Electronics are as fast as a cable.

m4a1mustang · 12-15-2009, 07:15 AM

Quote:

Originally Posted by spearfish25

I've wondered if this does anything to help:

Sprint Booster USA - MT

Seems like it just increases throttle sensitivity on acceleration. No one online really comments on how it would address the issue in this thread. I may go locally and try one out as a demo (offered on their website)

That's a popular mod over at MB World. The throttle on the V8 Mercedes are tuned for seniors, so you have to push the pedal 50% to get maybe 15% throttle.

370Zsteve · 12-15-2009, 07:38 AM

Quote:

Originally Posted by semtex

Nissan chose a heavy flywheel out of noise considerations.

Wow, Nissan did something to quiet the noisy engine? Pity they didn't do more.....................

370Zsteve · 12-15-2009, 07:40 AM

Quote:

Originally Posted by FricFrac

I doubt its circuitry lag - maybe a delay built into the software but not a hardware delay.... these ECU's are very capable.

Agreed. Unless this 'alleged' issue is hard coded into the circuitry. I tried this on my car and could not replicate.

semtex · 12-15-2009, 08:29 AM

Quote:

Originally Posted by Pharmacist

obviously the car is not in gear, or if its in gear the clutch is disengaged and srm is off. yeah it does seem like circuitry lag due to the electric throttle. all my previous cars had mechanical throttle cables, and throttle response was definitely much more immediate both in opening and closing the throttle

If your car is not in gear when you lift off the throttle, then I stand by my belief that it's related to the high-mass flywheel. The fact that it hangs for a second before it drops is consistent with what I'd expect from a flywheel with a lot of rotational inertia. But hey, who knows for sure, right? Heck, maybe it's not just one factor. Maybe it's a combination of factors (i.e., heavy flywheel combined with DBW).

spearfish25 · 12-15-2009, 08:41 AM

Still waiting for someone to comment on the Sprint Boost thing...

370Zsteve · 12-15-2009, 08:45 AM

Quote:

Originally Posted by m4a1mustang

That's a popular mod over at MB World. The throttle on the V8 Mercedes are tuned for seniors, so you have to push the pedal 50% to get maybe 15% throttle.

Huh?

kannibul · 12-15-2009, 08:50 AM

7AT does it too - when I brought my Z home, I nearly launched it through my garage, as I was carefully/slowly pulling in, and got "stuck" on the 1.5" bump where my garage door sill is.

I blipped the throttle, the BOLTED forward, I slammed on the brakes, and managed to not park my Z in my second bathroom.

DIGItonium · 12-15-2009, 08:58 AM

Ditto... I think it's a feature of some sort as I have noticed this behavior test driving the 7AT. The 350Z didn't do that, so it shouldn't have anything to do with the flywheel holding the revs.

kenchan · 12-15-2009, 08:59 AM

My other car does it too... Especially the one with ULEV. I don't think it has to do with the flywheel. throttle just hangs momentarily to burn off fuel.

Once you get use to it though you'll learn to time urself for the shift and it won't bother you. Since my other car hangs worse (and is a MT) the Z never bothered me at all.

semtex · 12-15-2009, 09:17 AM

If the 7AT does this as well, then I agree that it's most likely an electronic 'feature'.

12-14-2009, 11:32 PM	#17 (permalink)
cab83_750 Track Member Join Date: Apr 2009 Location: CA Posts: 887 Drives: 09 NISSAN 370Z Rep Power: 417	My other car does the slow Rpm drop. In researching, it was for emmission purposes. The unit is called a decel-valve. Disclaimer: this may not apply to our Zs Last edited by cab83_750; 12-14-2009 at 11:35 PM.

12-14-2009, 11:58 PM	#18 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	I've wondered if this does anything to help: Sprint Booster USA - MT Seems like it just increases throttle sensitivity on acceleration. No one online really comments on how it would address the issue in this thread. I may go locally and try one out as a demo (offered on their website) __________________ 2013 Cadillac V-Wagon, RIP Z Last edited by spearfish25; 12-15-2009 at 12:05 AM.

12-15-2009, 08:41 AM	#25 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Still waiting for someone to comment on the Sprint Boost thing... __________________ 2013 Cadillac V-Wagon, RIP Z

12-15-2009, 08:58 AM	#28 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Ditto... I think it's a feature of some sort as I have noticed this behavior test driving the 7AT. The 350Z didn't do that, so it shouldn't have anything to do with the flywheel holding the revs. __________________

12-15-2009, 09:17 AM	#30 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 32	If the 7AT does this as well, then I agree that it's most likely an electronic 'feature'. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

12-15-2009, 08:50 AM	#27 (permalink)
kannibul A True Z Fanatic Join Date: Jun 2009 Location: Jenks, OK Posts: 2,281 Drives: 370z Touring/Sport Rep Power: 267	7AT does it too - when I brought my Z home, I nearly launched it through my garage, as I was carefully/slowly pulling in, and got "stuck" on the 1.5" bump where my garage door sill is. I blipped the throttle, the BOLTED forward, I slammed on the brakes, and managed to not park my Z in my second bathroom.

12-15-2009, 08:59 AM	#29 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	My other car does it too... Especially the one with ULEV. I don't think it has to do with the flywheel. throttle just hangs momentarily to burn off fuel. Once you get use to it though you'll learn to time urself for the shift and it won't bother you. Since my other car hangs worse (and is a MT) the Z never bothered me at all.

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