O.K. this is serious, I have this problem shifting at high RPM's....

For some reason, when i let go of the gas at high RPM's, the engine (RPM needle) decides to stay up there for at least 2 seconds. And whenever i stomp on the clutch inside of that 2 seconds to shift up, i feel the clutch being fried/burnt (as if the gas pedal was still being pressed in while stomping on the clutch pedal).

I feel it in my foot, and I hear it, and then I smell it. Burnt Clutch. Not Good.

I have 2,000 miles on my G, and it seems like the Drive-by-wire throttle lag is non-existant at low engine speeds, however is lagging upon release at high rev's...causing slower shifts and burnt clutch, plus its not good for the engine to run at those high rev's for an extended period of time (i.e. more than 2 seconds to allow the needle to drop so that I can press the clutch and shift up)

Anyone else having similar difficulties? Any ideas on fixing this?


<font color=green>-Rambo</font color=green>
G35c 6MT DG/Willow

 

Hey bro, I know what you mean about throttle lag--- in my A/T I get the same effect when I gas it up to say 6k and release the throttle, the car still accelerates for a second b4 slowing.
Of course in your M/T when you want to shift, it means releasing the clutch while accelerating = burned clutch. We're getting the same lag on decceleration as on acceleration. Only thing I can suggest is to release the throttle a second or so sooner b4 depressing the clutch, to give the engine a chance to slow.
Check it out with the service adviser at the shop. He may have a way to make the throttle more responsive.
I haven't looked in the ESM yet, but there may be something in there about this too.......... L8r bro.

<font color=green>GSM</font color=green>

 

thanks dude

<font color=green>-Rambo</font color=green>
G35c 6MT DG/Willow

 

Hmmm...I have something similar, but I didn't know that it was a problem. You have me paranoid now.

I don't watch the tach needle drop, so I don't know if mine does the same thing or not, but the things I do notice at 5k+ RPMs are:

1. Different kind of feedback in the clutch pedal that doesn't exist at lower RPMs.
2. Shifting isn't as smooth.
3. Sulphur smell sometimes

I haven't thought much of the smell since my 240sx gives off a similar smell when I push it. I was told before that it was sediment in the engine burning off, so I figured that it was just that. But now that you mention it, I've burn my clutch before and it had the same kind of smell as well.

The next time I go up to high RPM's, I'll try granny shifting and see if that makes a difference.

G35c 6MT/BS/G/Prem/Aero/Nav

 

Hi Rambo...this is Growler. I haven't had that happen yet. Soon as I let off the accelerator my RPM's drop and I shift and get back on the gas....this all happens withing 0.5 secs I think. I never keep the juice on when I'm clutching...you don't really lose much for that throttle comes right back.

Clutch in>let up on accelerator and shift>clutch out, push the juice to her. Don't hold the gas trying to keep the revs up.

Be careful...I smoked my clutch once a few week ago starting out I think in fourth or fifth!!!!!!!

 

Hmm, thanks for the input guys.
Growler, your throttle lag seems to be non-existant then
as i recall, you have many more miles on your car than i do..... 6,000 i believe it was?
Then again, i know Dubiux has many miles on his too, hmmmmmmmm, i will definitely try this out tomorow and then talk to my service guy


<font color=green>-Rambo</font color=green>
G35c 6MT DG/Willow

 

I have similar issues below 3000 miles but after that everything seems to be smooth at any RPMs, after changing to synthetic @ 5000 miles it improves mileage and engine tone

 

Rambo....yeah, my coupe is just at 2300...........I think (IMO) the variation in shifting techniques between all of us is somewhat subjective and an individual thing...we're not flying jets...but again with our 6mt's the engine and trannys are not thinking for us..we are truly man (woman too) and machine connected. The entire affair is human... Back in 1964 I bought the first Pontiac GTO convertible on the east coast. 389 cubic inches of engine, 365 wheel HP...to the pavement. 315 ft/lbs of torque all for $2169.00 (THAT'S HOW OLD I AM). A THREE SPEED HURST SHIFTER ON THE FLOOR. That car was unbelivable, brute force, no wide tires....94 octaine gas and when yoiu shifted out of first gear at 65 mph, and went for second the front wheels would leave the road. only for a moment.........now this is the interesting part of my story. My 0-60 in the GTO happened in just 5.2 seconds.....with the big V-8. our "G's" are little marvel of engineering arn't they....considering we only have a little 3.5 V-6................our G's would hold the line with that GTO and probably spank it.

Moral..........drive that baby and have fun, We have a terrific vehicle and I could care less about SoCal and it's boring Benze's, Lexus's and common BMW's. At least us G-35's are different.............for a while.

Growler

 

¡¡¡¡¡THREAD UPDATE!!!!!
heh thanks for the advice growler... i dont know if i can drive it to redline any more.....seriously.....
Ok Today and Yesterday i drove her for about 160 miles total...

VDC has NO effect on my 6mt's clutch-burning/throttle-lag (i shall call it: CBTL)

I have tried a variety of shifting and throttle techniques
The lag is so unbearable i have a hard time writing about it because im very, very depressed about this. I will be calling the service department and setting up an appointment first thing on Monday.

To make things short: Any shift above 4,000 RPM will noticeably eat the clutch unless you let go of the gas for 1 second PRIOR to disengaging the clutch

Also, any shift above 5,500 RPM will eat the clutch unless you let go of the gas for more than 2 seconds PRIOR to disengaging the clutch

On all MT vehicles that i've driven, there was no CBTL, as soon as you let go of the gas and press the clutch, the rev's will fall like a rock and the clutch does not get burnt

My theory is that the butterfly/throttle valve is electronically controlled as well, and requires a motor to open AND to shut it, thus, we get CBTL. (Clutch Burning Throttle Lag)

I will keep everyone updated as to what my service department says

<font color=green>-Rambo</font color=green>
G35c 6MT DG/Willow

 

Dude, It sounds like there is a major delay after lifting from the gas, to the actual time the engine slows. To me it's a fault and should be fixed. Not sure if something is binding, or it's an ECU glitch. Raise hell at the shop, and tell them you want a new clutch too..........

<font color=green>GSM</font color=green>

 

2 seconds? holy crap take it to the dealer, my RPM goes down in less than a second, no more than one second....something is wrong there, maybe the clutch doesnt disengage that quickly..give it another 2000 miles then observe if it improves, IMHO I dont want anybody opening up my tranny and mess with them..

 

if it literally 2 seconds then you have a problem with your car.

As far as the rpms droping its just a chracteristic of the car, in all cars at high rpms it will hang for a moment(how long that moment is another question). I believe this hang is specifically due to momentum with in all the moving parts in a car and more specifically the weight of the flywheel. It seems to me Rambo that you are very very VERY used to driving one specific manual tranny car and havent quite adjusted yet.

But then again you are claiming a 2 second delay and an excessively grabby clutch(try pushing it in much faster- im sure you have) so it might just be a problem with your car or you need some more hours in the g.

 

"Any shift above 4,000 RPM will noticeably eat the clutch unless you let go of the gas for 1 second PRIOR to disengaging the clutch

Also, any shift above 5,500 RPM will eat the clutch unless you let go of the gas for more than 2 seconds PRIOR to disengaging the clutch

On all MT vehicles that i've driven, there was no CBTL, as soon as you let go of the gas and press the clutch, the rev's will fall like a rock and the clutch does not get burnt"

In this post and the previous one it sounds as though you're:

1) Letting the accelerator off
2) Waiting for revs to drop
3) Pressing the clutch
4) Shifting
5) Releasing the clutch

Is this correct? If so, then you should probably try:

1) Pressing the clutch and letting the accelerator off simultaneously
2) Shifting while waiting for revs to drop
3) Releasing the clutch

Letting the gas off in what amounts to neutral (clutch in) should result in a quick RPM drop. Doing it like you're describing keeps the engine in the picture, slowing rev drop greatly. It also means the clutch and engine speeds won't match if you shift quickly afterwards, which will produce clutch slip or burn.

Simultaneously pressing the clutch while stepping off the gas lets the car coast, slowing only a little, while engine RPMs drop quickly, matching engine and transmission speeds in the new gear in under a second usually.

If you are doing what I'm recommending already and still have a problem with very slow RPM drops, then you may indeed have a mechanical problem. It could be a "drive by wire" issue, or it might well be an emmissions control device problem. Many cars have controlled RPM-drop systems designed in to reduce exhaust emissions (too rapid drops produce lots of unburned fuel, I'd imagine). I had an '84 Mazda RX-7 that was a bit extreme in that regard...it forced me to shift rather slowly unless I wanted all-out tire-chirping acceleration.

 

Rambo this sounds like the same problem that i am having with my g .....yah...I really does i have 4732 miles on mine and sounds exactally like what my car is doing right now...I'm going to take it to the dealer to see what the problem is today ....pray that it is not some thing major .....

 

hey guys i appreciate the advice, i've tried everything though. I will try everything again later today heh...oh, and I just got off the phone with the service advisor and he said that there is a 12 month/12,000 mile premature-wear clutch warranty, so i am going to take it in and show him exactly what im talking about on Thursday evening.

<font color=green>-Rambo</font color=green>
G35c 6MT DG/Willow