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Ah ok so do you experience the same hesitation the rest of us do when taking off in 1st gear? Some pretty good descriptions in the thread I posted before
Ah ok so do you experience the same hesitation the rest of us do when taking off in 1st gear? Some pretty good descriptions in the thread I posted before
This is the weird thing, I don't, not even once.
Every time I floor it, the engine responds and just goes.
Now, my engine does see 7,000 RPM almost every time when I drive and it is fully warmed up.
As silly as it sounds, in the warm weather, I still like to drive with open windows to hear my Stillen exhaust
If the ECU has the ability to "adapt" to driver types, maybe that explains it? I really don't know.
This is the weird thing, I don't, not even once.
Every time I floor it, the engine responds and just goes.
Now, my engine does see 7,000 RPM almost every time when I drive and it is fully warmed up.
As silly as it sounds, in the warm weather, I still like to drive with open windows to hear my Stillen exhaust
If the ECU has the ability to "adapt" to driver types, maybe that explains it? I really don't know.
I'm still dumbfounded by this lag, I dont suffer from any of it on my 7at.
What I have noticed is a "lag" in drop down of gearing.
Hard to notice it other than a "lag" which for what I've experienced is the disengagement of the TC.
This is followed by the drop of gears based on throttle request.
The VHR is garbage under 2500rpms and in my opinion all the way up to 3500. Having a big v6 you'd expect the torque however we all know they are known for 5-8k rpm dominators.
The VHR is garbage under 2500rpms and in my opinion all the way up to 3500. Having a big v6 you'd expect the torque however we all know they are known for 5-8k rpm dominators.
Bull, the VHR is not designed for that. No one has ever said "Wow, I love the low RPM torque of this VQ engine!"
The VQ engines are designed to make power from about 3500 RPM to over 7,000 rpm.
The attached HP/Torque curve says it all.
I also don't have any throttle lag issues on my 6MT, but I suspect most have an automatic transmission that have a "slow to respond" issue more than an actual "throttle lag" issue. Drive by wire can be faster than a foot and a cable.
I have 6mt and have had it since I had the car. Had it really bad at first, it would buck from a stop, fixed it with a new throttle body. Now I get it after about 30 minutes of driving but not as bad as before with the bad TB. Goes away with a restart. First 10 minutes feels like your dyno above. Then gets slightly worse as we get to that 30 minute mark. Always happens after a stop. I've tried a few things. New throttle bodies. New spark plugs. Removed hood liner and rubber strips. Silicone intake tubes. Grounding kit. New brake switch. New o2 sensors. Tried a new MAF in both spots. Cleaned injectors. Even cleaned the oil gunk out of the lower intake. Used datascan 3 to save the proper o2 sensor map for the sensor model numbers I have. Only mods are megan test pipes and KN filters. No codes except for the secondary o2's. Attaching a pic of what it feels like using your dyno chart.
Next I am going to try new set of coils, a new accelerator pedal, cam sensors, crank sensor and knock sensors.. Maybe the timing solenoids. Other than new VVEL solenoids/assembly ( do these go bad? ) I have no clue past that. I have a injen x-pedal which helps but you can still tell its there when it happens. The torque is ok for me on the low end until this starts to happen. Especially after I just restart the car or start it first thing. Last will be a tune. I am going to take some logs once I get this new pedal in. Maybe someone here can read them for me. I can't really tell anything is off by the logs but I'm no pro. For what its worth I had this problem on my 03 maxima and it ended up being the knock sensor, degrading performance until you restart the car so that will prob be the last thing I try haha. Well those knock sensors are kind of a chore to get to on these 37's. Given up on resetting fuel trims and hoping the computer can work it out over time in the meantime.
In my defense, I've had my idle adjusted by my buddies at Nissan. Anytime the throttle is disconnected it might loose it' sync.
Pedal dance resets it sometimes but it is up to your driving behavior to adapt.
By doing an idle relearn commanded by consult you can monitor all trims after this relearn is performed and can be adjusted also.
Get rid of that injen X pedal and get it tuned. The tuner will fix this.
Pedal commanders are like MSD ignition coils for this car. You know the brand and what they stand for but proven results have shown this tech is not necessary for these cars to make power.
Pedal commanders are like MSD ignition coils for this car. You know the brand and what they stand for but proven results have shown this tech is not necessary for these cars to make power.
Pedal commander doesn't make any power or tq its just a throttle controller and makes your gas pedal think the pedal is pushed down farther than it is basically. It really smoothened my 7AT out and did wonders for the responsiveness.
There has been a lot if discussion on throttle lag and I am trying to understand it.
• Is this only an issue on the 7AT?
• Do you think it is a throttle issue, or is it the 7AT not being responsive?
Thanks!
It's the throttle responding the way the ECU has it programed to. I, too, was struggling with this years ago and read through many forum posts on here about it. I even tried that Sprint Booster thing, which was a waste of money. Want to know what solved all that "throttle lag" for me? Getting an ECUTEK tune! Literally nothing else I know of will smooth out the entire engine experience in addition to getting rid of what you're describing. It's well worth the money if/when you decide to do it.
It's the throttle responding the way the ECU has it programed to. I, too, was struggling with this years ago and read through many forum posts on here about it. I even tried that Sprint Booster thing, which was a waste of money. Want to know what solved all that "throttle lag" for me? Getting an ECUTEK tune! Literally nothing else I know of will smooth out the entire engine experience in addition to getting rid of what you're describing. It's well worth the money if/when you decide to do it.
Who did you get to tune for you? Is there something specific that we need to mention to the tuner to get it done or is it just something that goes away after they mess with it?
Thx
If you want to determine if the issue is throttle lag -OR- the automatic transmission being slow to quickly respond use a cheap OBD scanner and data log:
• Absolute Throttle Position
• Accelerator Pedal Position
Here are what the results look like without any delay:
Would like to report that I fixed this issue on my car. It turns out that it was my rear o2's causing the issue due to the test pipes. I completely over looked and ignored this being a cause because I didn't realize that these modern ECU's actually do use the rear o2's data for fueling. The fix for me was 90 degree angled spacers on the test pipes. No more CEL, hesitation, lag or bogging anymore.
