Initial Acceleration

[Flamenguista]

What's up felllars!

Got a quick question, anyone notice a slight hesitation when accelerating from a stop? This is when you just give it normal power to get the car going, not pushing the car.

I'm at 550 miles and have been getting more aggressive with the car, took it to 5,000 RPM today. But I do notice a little hesitation in the torque.

Thanks in advance!

 

[Disaster]

What's up felllars!

Got a quick question, anyone notice a slight hesitation when accelerating from a stop? This is when you just give it normal power to get the car going, not pushing the car.

I'm at 550 miles and have been getting more aggressive with the car, took it to 5,000 RPM today. But I do notice a little hesitation in the torque.

Thanks in advance!

I don't notice any hesitation unless I push it hard enough to engage the traction control. Then it is unforgiving. With the Genesis, "smooth is fast" is forged into law by the aggressive ESC.

 

[XBOHDPuKC]

I feel no hesitation either. The only time it needs kinda pauses when stepping on the gas is when you have auto-hold engaged, but that's quite expected I believe.

 

[ASHDUMP]

I know what your talking about Flam. I think it has to do with the quick shifting between gears 1 and 2. If you have less than aggressive acceleration it is noticeable. If you give the throttle a good push it is less noticeable.

I just bought a 1998 Ford F150 2x4 V6 and I feel that the acceleration in that truck is way more sensitive. You only need to push the throttle down very little to get a good reaction. I think some of these new CAFE standards are killing the feeling/motion of the newer cars.

 

[sherrod]

With the V8 and the 6-speed transmission the first shift point is around 15 MPH. My guess is that you're feeling that shift. This is one of the reasons I think a 6 speed transmission is overkill with a V8. A four speed tranny with the first shift at 25 would be better. This is one of the reasons I don't want an 8 speed transmission.

 

[Aquineas]

What's up felllars!

Got a quick question, anyone notice a slight hesitation when accelerating from a stop? This is when you just give it normal power to get the car going, not pushing the car.

I'm at 550 miles and have been getting more aggressive with the car, took it to 5,000 RPM today. But I do notice a little hesitation in the torque.

Thanks in advance!

I feel the hesitation. What I suspect you're feeling is the transmission switching into second (and sometimes third) as aggressively as possible. Mine typically switches into 2nd by 900 rpm, and 3rd not long after that.

 

[Sayantsi]

It could be the dbw system, if you are talking about the initial, press the gas, wait a second hesitation. The ECU mapping is for mpg not performance imo, so you notice things like that hesitation.

 

[TJPark01]

It could be the dbw system, if you are talking about the initial, press the gas, wait a second hesitation. The ECU mapping is for mpg not performance imo, so you notice things like that hesitation.

This is correct. The Drive by Wire system, or electronic throttle control, or what ever you want to call it does this on most new cars. The Genesis is trying to balance performance with economy. You can get around these systems with a Sprint Booster. I have never used one, but I am hearing good things about these from performance people.
(disclaimer, don't do a follow up post about how you're getting 15 miles to the gallon afterwords.)

http://www.sprintboostersales.com/

 

[ASHDUMP]

Sprintbooster looks quite tempting. I really want one..... not sure I want to spend the money... Just spent a crap load on detailing stuff!!!

 

[Sayantsi]

I'm hoping someone will release an ECU remap for the Genesis sedan.

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[Flamenguista]

Hey Guys,

Thank you very much for the responses!

@ASHDUMP, you are right on the money with this comment. (as were a few others. )

"I know what your talking about Flam. I think it has to do with the quick shifting between gears 1 and 2. If you have less than aggressive acceleration it is noticeable. If you give the throttle a good push it is less noticeable.

I just bought a 1998 Ford F150 2x4 V6 and I feel that the acceleration in that truck is way more sensitive. You only need to push the throttle down very little to get a good reaction. I think some of these new CAFE standards are killing the feeling/motion of the newer cars. "

Last night, as I got more aggressive with the car it does become less noticeable. Its always when I baby it at the start. Guess I need to just gun it.

@TJPark01: http://www.sprintboostersales.com/ looks very interesting! Gonna look a bit more into this.

Thanks again guys and happy Friday!

 

[ctrcbob]

I hate Drive By Wire. Bring back throttle cables.

 

[Disaster]

I hate Drive By Wire. Bring back throttle cables.

This is a common myth. I have been involved in engine design for 30 years and the old throttle cables had plenty of their own problems. They simply yanked open the air intake and the rest of the system had to respond. You can actually design much better response curves by determining the driver's desire for acceleration and then operating all the engine components to maximize that (throttle, fuel, timing...etc.)

Having said that, there is always a balancing act between getting even performance at part throttle, good fuel economy, low emissions, and immediate acceleration response. Generally, low throttle positions are tuned for the former, while WOT throttle positions are tuned for full power acceleration.

The other thing that comes into play is transmission durability. Sometimes the engine is actually "throttled back" in some gears to protect the transmission.

 

[Mark_888]

I don't know about the ZF transmission on the V8, but the Aisin transmission on the V6 definitely has a learning period where it adjusts to the driving style of the driver and is a little jerky for the first few thousand miles. Same thing happened on a Toyota product I previously owned (which is not surprising since Aisin is about 50% owned by Toyota). But it accelerates very smoothly now, so not a problem. Might reoccur if I have to replace the car battery and the transmission electronics looses memory and goes through learning period again.

 

[Flamenguista]

Mark! I like the way you think! I have noticed, in a weird way, that my car is adjusting to my driving.

Thanks everyone for the responses!