• Car enthusiast? Join us on Cars Connected! iOS | Android | Desktop
  • Hint: Use a descriptive title for your new message
    If you're looking for help and want to draw people in who can assist you, use a descriptive subject title when posting your message. In other words, "I need help with my car" could be about anything and can easily be overlooked by people who can help. However, "I need help with my transmission" will draw interest from people who can help with a transmission specific issue. Be as descriptive as you can. Please also post in the appropriate forum. The "Lounge" is for introducing yourself. If you need help with your G70, please post in the G70 section - and so on... This message can be closed by clicking the X in the top right corner.

Non-Linear Acceleration with the 4.6

B

bleetoo

Hasn't posted much yet...
Joined
Dec 8, 2008
Messages
3
Reaction score
0
Points
0
Hello, folks...I've been reading the forum for about a month, since I bought my 2009 4.6 Genesis.

Overall, I'm pleased with the vehicle, having escalated out of a 2008 MB E550.

I'll go into THAT experience, some other time, but, for now, I have a question for those of you who are truly connected to their vehicle, and would know exactly what I'm referring to when I describe this issue.

When starting from a light or stop sign, and using moderate (not flooring it) accelerator foot pressure, do you notice a sort of non-linear not consistent torque curve type of acceleration?

To me, there seems to be a slight drop-off in the mid-acceleration power band...a "non-linear" build up to speed...where you can feel ever so slightly perceptible but not horrifically pronounced "drop-offs" during the period of acceleration to level speed.

You might call it a "hesitation" but it's not really that...it just seems to be a ever so slightly there "kick in...slight drop off...kick in" sort of acceleration sequence...say from zero to 50, up through all 6 gears...even though this phenommena I'm speaking of isn't gear changing.

The car doesn't "hesitate" up to speed, and readily reaches extra-legal numbers quite capably and rapidly...especially when "flooring it". It's just that moderate powerband I'm talking about.

This isn't a "showstopper" for me, I'm just curious if you other 4.6 owners have the same sort of experience. Is it a Hyundai thing? Tau? The ZF box?

Anyone feel the same sort of thing?

Thanks for your responses.
 
somehow the acceleration curve as changed over time for my car and it seems to be related to shift points of the automatic transmission.

Since that transmission is learning from your driving style there is little you can do to control this. In my case I normally drive very relaxed and that seems to have translated to very early shifting which results in some power gaps at the shift points. Nothing too annoying but noticeable as you say.

Cheers

Thomas
 
Last edited:
I've noticed it also, and agree with Thomas about us "teaching it". It was the same in my 3.6 six speed VW, and the "cure" was to untrain it by using the Tiptronic for several trips. For some reason, the motor/trans forgot my cautious middling ways after doing that. Eventually I learned to stop caring and to appreciate the improved mileage.
Maybe worth a try?I
 
That was a deal breaker for me and the reason I bought the V6. It's the electronic babysitters designed into the engine computer that is causing the problem.
 
Yep, I know exactly what your talking about.

Its like someone is up under the hood pinching the gas line and then letting go.

Mine only does it when the engine is cold. Once I hit normal temps I am good to go. I think it is kinda like Toyota. My parents camry and my old Tundra will not let you floor it with the engine cold. It protects itself from engine damage by not letting the revs reach a certain level. I am thinking this may be Hyundai's way of protecting the engine. Of course, I may be waaaaayyyy off here.

:)
 
Black genesis badges emblems letters lettering chrome delete
Could this be something a tuning shop can rectify? I'm thinking so....
 
I am experiencing a slightly different situation: I find that the car lurches off at start. It tends to surge from a stop. I am thinking it may be because of the delivery. The car had over 300 miles put on it by the dealership in a swap to get me the color I wanted. Maybe the delivery gut got on it and it will take some more miles for the trans to "unlearn" the "jack rabbit" off the line. If I really concentrate I can get the car to start out smoothly, but it really feels like I'm driving like an 80 year old! When I test drove the 6 I did not experience this.
 
BigElm said:
Could this be something a tuning shop can rectify? I'm thinking so....
Click to expand...

Very well could be!

I have found a local speed shop that will do 3 Dyno's and a minor tune for $80!

He said he may give me a discount if I am the first Genesis V8 to pull up. :D

I will mention the "hesitations" to him.

ALSO, Do any of you think that a minor tune will void a warranty OR if I do get a little tuning and have to have computer updates that it will RESET to factory specs? :confused:
 
PINGGOLF said:
Very well could be!
I have found a local speed shop that will do 3 Dyno's and a minor tune for $80!
Click to expand...
Careful with those, what often happens is that they just change the test conditions, and make the car appear to be tuned up, but they did not do anything to the car at all. It would be an interesting test though.
______________________________

Help support this site so it can continue supporting you!
 
The very first post on a V8 test drive mentioned "something akin to a turbo lag" and I do not think anything has changed. Forum members have pointed to the chosen gearing used by Hyundai on the ZF transmission as the primary culprit in the attempt to increase mpg. I believe this is correct. If you do the math on the ratios it makes more sense of what you feel. The powertrain of this car is so smooth and robust with torque that for me it is really a non issue. I also agree with members that the ZF will learn your style over time and smooth out this quirk a bit.

This should not be a show stopper for anyone. If one consistently drove the car in this 0-60 fashion they would get about 8 mpg and should have chosen a sports car vs. a luxury sedan.

You have to agree however that after the "lag" when the torque kicks in it is all just big grins....The Tau is simply awesome...the ZF is smooth as silk and the power band for this car is exactly were you want it for a luxury sedan. But I agree that the marriage of Tau/ZF ratios could use a bit of tweaking.
 
Hey PING, if you plan on putting a CAI and exhaust, you may want to wait on the tuning depending how soon you plan on doing the mod. Other than that, I would be interested in seeing the gains of the tune. :)
 
PINGGOLF said:
ALSO, Do any of you think that a minor tune will void a warranty OR if I do get a little tuning and have to have computer updates that it will RESET to factory specs? :confused:
Click to expand...

you will run the risk of the dealer flashing over a tune. i would be hesitant about it for now, because i have a feeling with this being such a new car that we will see some reflashing of the engine ECU.

the other thing is that the gains from a normally aspirated engine that no other changes are made to, are minimal.

i flashed my W8. i also had a tuner friendly dealer. when i went in for service, i always told them not to reflash the ECU, they would write that down on the service ticket and it was never an issue, but again that was a tuner friendly dealer. it seems to me that hyundai corporate is interested in gaining more of a market share with their apperance of being open to this (SEMA genesisesesss both in coupe and sedan form). how this will translate down to the dealer level is yet to be seen.

on my truck i am lucky in that i have a SCT Livewire (up to an additional 120HP and 250 ft/lbs :D). i can load 3 different tunes into the ECU at will, and can always put it back to stock, just before i take it to the dealer. unfortuantely they don't offer anything for hyundai....
 
I'm going to describe what I feel. The best I can describe is too many RPM’s, then the RPM’s drop and then a shift to the next gear. Is this what is being discussed? Thanks for your information.

Bear
 
Hey, folks....just a follow up to this thread. I've been driving around for a few days without traction control, that is, turning it off when I start the engine, and, lo and behold...it may be psychological, but the non-linear acceleration issue I described to begin this thread seems to...disappear.

If you other 4.6 owners could give it a try, and report the results, I'd appreciate it.

Thanks.
 
Black genesis badges emblems letters lettering chrome delete
KDM Warehouse is the official Genesis Forum Store! We ship from the USA, not Asia! --> [CLICK HERE] <--
Looking to update and upgrade your Genesis luxury sport automobile? Look no further than right here in our own forum store - where orders are shipped immediately!
I have the same issue in my new 4.6. I will try without traction control and see what it does...

I do a lot of city driving and this is pretty annoying. I get beat off the line by minivans just so i dont go 0-60 in 5 seconds.
 
I have an automatic in my Subaru WRX and sometimes I experience the same problems. When this happens I disconnect the battery and reset the memory and all is OK. I am reluctant to do this with the Genesis since so many things have to be reset. I have been trying to "relearn" the trans thru my driving but so far no luck.
 
Without TC I notice it pulls harder when floored. I also noticed the engine "opened up" after about 1500 miles.
 
You must log in or register to reply here.

Cars Connected in the Apple App Store Cars Connected in the Android App Store
Great products:
- VIN Check
- Add more horsepower!
- Clean your leather!
- Safe Emergency Charging
- Windshield Repair Kit
- Chemical Guys HydroSpeed Ceramic Quick Detailer
- Chemical Guys HydroCharge High-Gloss Hydrophobic SI02 Ceramic Spray Coating
- Get a dash cam!
- Auto Buyers Market
- Foreign invaders vs USA gangs

The Genesis License Plate Frame
Protect your vehicle from code scanners

Featured content

Back
Top