ok..this may be a repost, but sorry, i didn't have the time to search the forum...but, when i shift my 6speed into gear, usually in the higher gears 3+, and shifting it fast and hard (as in pushing it into the gear), my RPM usually jumps a few hundred and then drops as soon as I release the clutch....sorry, I'm dumb...can someone explain?

 

Are you trying to powershift? What you just described sounds like a novice powershifter, or you are keeping your foot on the gas in between shifts, so when you push the clutch in to go to the next gear your revs jump.

 

You need to let off the gas, simultaneously, as you push in on the clutch. What is happening is:
1. You push on clutch, then you're not letting off accelerator enough.
2. Clutch disengages from gears, so engine runs easier(hence, making your RPM's jump because your engine has the same amount of gas being injected into it but no load anymore)
3. You shift to next gear and RPM's drop(this is because the load of the vehicle is being re-introduced to the gears/engine as you let out on the clutch again)

.....ease up on the accelerator when shifting. This will solve your problem.

 

actually i've seen this going down the track.. hasn't happened in my other cars (hondas, toyota/lexus, & an s13)

only happens in my z.. i'm thinkin that it has to do with throttle by wire-maybe it doesn't "close" as fast as it does compared to a cable

just a thought

 

Yes, this is mainly due to the eletronic throttle actually ..it's been pissing me off..never happened to me before in any other car..
when u push in the clutch it doesnt instantly fall like a cable would..it actually pauses/holds at rev for a bit...gay

 

I let off the gas fully before I even touch the shifter....and no, I'm not power shifting...try it and notice it on your car....i take off and really give it gas, and foot fully off gas pedal, clutch (to where the pedal is fully depressed), pull out of gear and throw into next gear fast, and the rpm will jump a bit and then drop...

 

Its a good question but belongs in the racing forum because it sounds like a racing technique (not a perfect technique but still applicable to racing).

You're either letting your foot OFF the throttle too late, or shifting too slow.

Actually, the technique that you are using is better than the alternative: during the shift, the RPMs drop.

BTW do you have any times slips which you can scan and post? Time slips are a realistic way to judge good or poor shifting technique.

 

Im not doing this while racing...i usually shift around 3-4000 rpms when this occurs...anything below 2500 doesn't affect much....I'm not sure what happens when redline, cuz usually when I drive to redline, I don't look at the RPM guage, i look at the road and notice when that shift light blinks....

 

I edited out the line about the rev limiter because in the situation that you described, you can push the RPM past the rev limiter.

 

I dont know wtf you guys are doing with your cars but I have never had this issue in my Z....

 

try it and see

 

The tach drops all goofy like between shifts. Its normal bro.

https://my350z.com/forum/2003-2009-nissan-350z/134031-ecu-blips-the-throttle-at-shift.html

 

Did you not see my above post? I have never had the issue you described, sorry man....

 

I seriously don't think JoeAsian is taking his foot off the throttle in time. I will admit, the throttle response is a bit slow, but look, it's a 32 lb flywheel, and your clutch disengages as soon as your clutch pedal moves. So you have the accelerator pushed in, and all this gasoline is poured in, when it burns, your rpms do not go up immediately because it takes time for the flywheel to gain momentum.
1. Take your right foot completely off the gas pedal and wait for at least half a second.
2. Then pick your left foot up from the kick plate and onto your clutch pedal.
3. Without touching the gas pedal again, shift to the next gear.
4. After you have released the clutch and your foot is back on the kick plate, then press the gas pedal. You will see that it is your own fault that the rpm jumps. I agree with Alberto.
(I used to jump rpm too, so I tried this. It's your own fault, don't blame the car.)

 

i dun have this prob 3rd gear and up, but first is a ***** tough as my rev will jump 100 200 rev then move down

 

but i feel ur pain -_-!

 

I'm not blaming the car...was just wondering if anyone else had the same experience....it is probably me though, I always try to shift gear as fast as possible before the RPM drops....so I pull off throttle as quick as possible and at the same time slam the clutch on and off as quick as possible...that's probably it there...

 

The RPMs do seem to not always match up during regular driving. If you are driving spirited they fall right into place (maybe it's because of shifting faster too) but when doing normal driving they fall and then when I shift into the next gear (unless I slam it like I'm racing) they are too low and the synchros have to bring them back up. Gives it a jerky ride during normal driving. It's not a problem, I just either have to shift quicker during regular driving or match revs.

 

Ok I went out and shifted from 2-3, and 3-4 at 3500 rpm's pushed the clutch in all the way fast and slow and it happened! But its not the motor revving up, the tach needle just seems lazy or too sensitive. The tach needle when I pushed the clutch in did for a split second jump maybe 100rpm's but if you listen to the motor(easy for me my Z is LOUD) the revs dont actually jump. Id chalk this one up to a lazy tach, like it needs a split second for the drive by wire to tell it your not applying throttle anymore then it starts its descend to idle.

 

I tried it last night and paid close attention to fast and slow shifting....it seems that when I shift fast, and lift my foot off the throttle too fast and engaging the clutch too fast, the throttle doesn't come up fast enuf...I'm not trying to say I'm superman that I shift at super speed, but it seems the throttle pedal sticks a little