Lag/Hesitation
05-08-2017, 06:13 PM
#21
AudiWorld Member
Join Date: Jun 2008
Location: Mountain Brook, AL
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I understand and appreciate what you are saying. Here is why my response. First of all, the lag is never as long as it seems like it is. Everything we do in life is measured against expectations. When you mash the throttle on a 369 lb ft sports sedan you expect it to haul butt and leave everything in its dust, including oncoming traffic. If there is a .5 second delay you have an "oh crap" feeling. But if .5 seconds is enough to get you into an accident you were an idiot to pull out anyway. Does that make sense to my response?
08-02-2017, 08:42 AM
#23
AudiWorld Senior Member
Not OP but I've got just north of 1500 miles and 2.5 months of ownership on mine and it's still bad for me as well, and not getting any better.
On my old V6 Accord, I could mash the gas at any point and the car would GOOOOOO like a greyhound that just saw a rabbit.
On this car, whether from standing start or changing lanes at speed on the highway, the greyhound is a lot faster...but it has to get up out of bed first. There is a solid full second of hesitation between pedal mashing and the car's reaction, even in full dynamic with the transmission in S. The problem is not even fully circumvented (though it is helped) if I paddle shift down a few gears first.
In this thread, James Cole mentions that an aftermarket downpipe and cat delete will solve this problem on the Audi 3.0T. I can't speak for that but he is right in that just having the transmission in S instead of D only helps by about 20%. I might even say it helps by 30-40%. Either way it isn't the full solution.
Personally I will just live with it and hope that some day an ECU/TCU tune (or better yet an OEM update) will be available to eliminate this without doing surgery. But if not, oh well. All cars have their quirks.
On my old V6 Accord, I could mash the gas at any point and the car would GOOOOOO like a greyhound that just saw a rabbit.
On this car, whether from standing start or changing lanes at speed on the highway, the greyhound is a lot faster...but it has to get up out of bed first. There is a solid full second of hesitation between pedal mashing and the car's reaction, even in full dynamic with the transmission in S. The problem is not even fully circumvented (though it is helped) if I paddle shift down a few gears first.
In this thread, James Cole mentions that an aftermarket downpipe and cat delete will solve this problem on the Audi 3.0T. I can't speak for that but he is right in that just having the transmission in S instead of D only helps by about 20%. I might even say it helps by 30-40%. Either way it isn't the full solution.
Personally I will just live with it and hope that some day an ECU/TCU tune (or better yet an OEM update) will be available to eliminate this without doing surgery. But if not, oh well. All cars have their quirks.
08-02-2017, 11:33 AM
#25
AudiWorld Senior Member
Disclaimer, LC is not a feature I care about so I haven't researched this much at all. Tried it in a 2017 A4 SilverCar rental once earlier this year and haven't thought about it since.
08-02-2017, 01:12 PM
#26
AudiWorld Super User
Good to know. I have not tried launch control. TBH I thought that was an S-tronic-car-only feature; I didn't think the B9 S4s had it?
Disclaimer, LC is not a feature I care about so I haven't researched this much at all. Tried it in a 2017 A4 SilverCar rental once earlier this year and haven't thought about it since.
Disclaimer, LC is not a feature I care about so I haven't researched this much at all. Tried it in a 2017 A4 SilverCar rental once earlier this year and haven't thought about it since.
08-02-2017, 01:47 PM
#27
AudiWorld Senior Member
Proper launch control is an S-tronic thing only. It's a controlled dropped of the clutch from high revs. Cars like the B9 S4s have lunch control, too, but it's different. It's what's referred to as brake torquing. It holds the revs of the engine at the stall speed of the torque converter. The stall speed is the maximum rpm that you can apply to the input side of a torque converter w/o forcing movement in the drivetrain. The stall speed is usually somewhere around 2000-2500 rpm. It's basically a way of taking the slack out of the fluid coupling of the torque converter and immediately shoot forward the moment you take the foot of the brakes. This can be performed manually, too, but if done improperly, the stress on the drivetrain can damage the torque converter.
The new info / point of clarification is, Does the 2018 S4 with Tiptronic include a launch control program where even though you mash both the brake and gas at the same time, the computer holds the RPM at or just below the stall speed, at the "optimal place" before it overstresses the torque converter, or does it just work like any other auto trans car where you mash the brake but then modulate the gas yourself?
Put simply, is the computer going to step in and manage it via a program if I attempt to put both pedals to the floor at the same time or do I need to hold the brake firmly and carefully bring the gas to 2500rpm myself like I had to in my old car?
08-02-2017, 02:45 PM
#28
AudiWorld Super User
Good info, matches my understanding.
The new info / point of clarification is, Does the 2018 S4 with Tiptronic include a launch control program where even though you mash both the brake and gas at the same time, the computer holds the RPM at or just below the stall speed, at the "optimal place" before it overstresses the torque converter, or does it just work like any other auto trans car where you mash the brake but then modulate the gas yourself?
Put simply, is the computer going to step in and manage it via a program if I attempt to put both pedals to the floor at the same time or do I need to hold the brake firmly and carefully bring the gas to 2500rpm myself like I had to in my old car?
The new info / point of clarification is, Does the 2018 S4 with Tiptronic include a launch control program where even though you mash both the brake and gas at the same time, the computer holds the RPM at or just below the stall speed, at the "optimal place" before it overstresses the torque converter, or does it just work like any other auto trans car where you mash the brake but then modulate the gas yourself?
Put simply, is the computer going to step in and manage it via a program if I attempt to put both pedals to the floor at the same time or do I need to hold the brake firmly and carefully bring the gas to 2500rpm myself like I had to in my old car?
08-02-2017, 03:17 PM
#29
AudiWorld Senior Member
Got it, thanks bud. Just wanted to clarify and make sure I fully 100% understood before inadvertently loading up a few hundred ftlbs against a hydraulic coupling and dropping the hammer.
08-02-2017, 05:03 PM
#30