Hey guys

I was wondering if some of you are having this problem as well.

Whenever I have the car in 2nd gear, and am using the DS mode with the shifter, not the padels, when I do a 2nd gear pull such as:

Stick car into 2nd gear, reving till 4k then stomping it, when I shift into 3rd, the car jerks forward and a jolt comes from the rear end. The feeling that I am getting is that the drive shaft is spinning to fast for the differential and the car is jerking into 3rd because the diff has to slow down to change gears, then speeds right back up because of the momentium of the driveshaft.

Also, when I have the car in DS mode, and am using the shifter, not the padels, when I get to redline, the car doesn't shift.

In automatic mode, when I get to redline it shifts fine....

Also when I use the padel shifters, and change gears, the car jerks from 2nd to 3rd as well under WOT.

This is all very annoying when I'm trying to have some excitement with the G. I switch off Traction control, and stomp it, in DS mode, but I hit redline and bounce off the limiter. Then shift, then continue going.

Long time ago when I first got the car, I shoved it into 2nd, and stomped it. When I hit redline, I preshifted, and the car dudded out. Like the ecu went into limp mode, and the car slowed down, whole time I have the pedal in the floor and it made a loud dud noise. Then it kicked back up and I flew through 3rd.

Do you guys think something is wrong? I am going to the dealer monday, and will have them take a look at it with me. But I am afraid that I have to replace something based on my own fault. I believe the padel's were installed after the car was built.

Anyone have any familiar characistics that I may present to the service rep so I have a bit of headway into it, and may be able to get the car serviced through warranty before it expires?

Thanks!

 

Is it an "S" model? If so the paddles came with the car. Furthermore, the paddles themselves wouldn't effect shifting dynamics in manual mode.

Your problems don't sound normal. There is either something wrong with the shift programming, your tranny, or it's your driving because I never get the issues that you described.
If there is an issue with the car, I anticipate that if you are under warranty, the dealer will take care of it without pushback.

 

That's weird. My 5AT shifts fine on DS mode, but the 1-2 shift is way too lazy. It kinda sounds like a MT car with a worn clutch.

 

Ok so I am going to get into this a little deeper...

When I am driving the car slower, the shifts are really smooth. The only time I get a dud feeling from the rear end is when I have the throttle pushed to the floor, and then do a shift.

Obvisiously there is something wrong, if no one else is experiencing this problem.

Thanks for the input guys, dealer will def get a earfull on monday.

 

When using manual mode you have to shift a few hundred rpms before redline to account for the delay. Otherwise you will just bounce off the rev limiter every time. Also, you aren't letting off the gas when you shift, then getting back on it again are you?

 

I agree with Wakeboardr, you have to shift with few hundred RPM below redline in manual sport mode or it will get into the rev limiter every time. Prior to having my tranny tuned during my SC install the 1-2 shifts were really lazy (like what NEETO was describing) as the tranny is allowing slippage during engagement to provide a smoother shift. If you are experiencing these type of problems when in Auto DS mode then I would agree that you should have your dealer check the tranny programming and make sure it is not off. The car should never get into the rev limiter in any of the full auto modes if the programming is correct. Also, with the VDC on, it can sometimes feel like the rev limiter during an auto gear change if your wheels lose traction. You should notice the slip light on in this scenario. I think that the VDC is simply acting like the rev limiter in this case to mitigate the slippage (spinning with loss of traction) of the rear wheels. No matter what, it would not hurt to have the dealer check it out.

 

Sometimes I let my foot off the gas to change gears, and the car shifts smoothly into next gear. If I hold the gas down, then the car dud's or jerks from the rear end, like the gearing isn't exactly on point to change with such quickness. It is messed up, I know it is. The car doesn't feel normal. I think previous owner, or someone who had the car was launching it. I bought it used.

@dal1307

Thanks. It is apparent something is wrong with the ecu then, if I do bounce off of the limiter. Could be the reason my tranny/diff feel the way they do under wot while changing gears in DS Mode. However, I've noticed that sometimes in DS mode when I get on it, it will shift into the next gear automatically. But then sometimes it'll just bounce off the limiter.

You have bascially confirmed the ecu is no acting normal.

Thanks guys. Dealer will look at this monday for sure.

Rolled into a big *** pothole on stock suspension. If I would of been lowered it would of probably pulled my bumper off. Glad I wasn't. Now I have to get an estimate for that. Will turn to the county for repairs though.

 

I'd recommend taking it to dealer and get an ECU flash.
One thing that... IMHO really helped was Betty's Grounding kit.

The car has Electronic Throttle Bodies and we've got 2.
The Factory ground is like a 35AWG wire. I put Betty's 8AWG
carbon fiber colored wire kit on, and the shifts are tight and quick.
Before the add, I'd floor the pedal and the RPMs would rev but it took
a second or two before engaging... Now... Very little delay. Give it a shot!
Either way, it will only improve things!

 

Not shifting in DS mode is a definate problem, dealer time for sure. Transmission fluid level and state is #1 on the troublehsooting list.

 

From what I've read the throttle is 100% controlled by the VVEL. The throttle bodies are there just in case the VVEL fails.

 

Just to make sure you know, the auto tranny has 3 different modes.

1. D - Regular Drive
2. DS - Holds the gears longer but will switch automatically
3. Manual Mode - After you pull the gear shift to the left(DS) push the shift **** forward(+) and you enter manual mode. In this mode the dash will display what gear your in instead of DS. The car will let you hit the Rev-Limiter in Manual Mode.

Sounds like your confusing DS with Manual Mode.

 

If you try shifting in DS mode the car automatically goes into Manual Mode.(Thats when shifting with the Shift ****) Try putting the car in DS Mode without shifting and the gears should shift automatically. If not then you have a problem.

 

VVEL - is not the throttle...

 

Read up son.

http://www.nissan-global.com/EN/DOCU...0713VVEL-e.pdf

Here's the thread:
https://www.myg37.com/forums/engine-...bout-vvel.html

 

Thanks for that NEET, Great Stuff... But I guess what I was saying is...
WHAT Controls the VVEL? Isn't it sill the accelerator? which is linked to the dual throttle bodies?