View Full Version : jerking motion while driving
johnnylee3 09-19-2005, 05:51 AM so, i've had my rx8 for a little more than a year now. even after having it for a year, when i drive my car hard there's still a huge jerk. i drove my friends mazdaspeed protege today for the first time, and gunned it and it was much smoother than i've ever done with my 8. i was just wondering, if it was just my driving, or possibly something with the transmission that doesn't allow us to make smooth shifts. any advice would be greatly appreciated :p
Brice-RX8 09-19-2005, 08:26 AM I think it is because the rotary is so responsive and the flywheel is rather light compared to most cars, that the 8 response some much more quickly and isn't dampened much when gunning it. I like it for the most part because it makes the car feel like it has some real balls, but I do have a problem with trying to creep slowly in 1st, you have to be almost perfect with the throttle to creep and not jerk around.
alnielsen 09-19-2005, 09:30 AM The "jerk" you are feeling, when you are driving the car hard, isn't normal. It isn't the flywheel either. I have the Mazdaspeed lightweight flywheel and don't have this problem.
Brice-RX8: The jerking you feel whe creeping slowly in 1st gear will happen in any car that is on the low end of it's torque curve.
Johnnylee3: You don't give a very detailed discription of your problem. Fuel deposits are one thing that could cause this and is easy to correct. Use high quality premium "Top Tier" name brand gasoline to clean out these deposits.
johnnylee3 09-19-2005, 06:16 PM i'll try that, but i dont' know, it just feels that the 8 is really hard to drive smoothly while driving in full open throttle.
RotaryManiac 09-19-2005, 06:26 PM Its not that hard, and im a new driver. Now i can go WOT and pretty much drive smooth most of the time, except for the rare jerking when shifting into second.
staticlag 09-19-2005, 06:42 PM Are you talking about the jerking when you take your foot off the throttle? When does the jerking occur? is this an AT or MT?
johnnylee3 09-20-2005, 12:58 AM just shifting in general for a stick, it sounds like it's just me...hahah
staticlag 09-20-2005, 01:04 AM just shifting in general for a stick, it sounds like it's just me...hahah
Probably,....
Brice had it correct. The Rotary engine has far less inertia than a piston engine, and requires precise driving for a smooth drive.
johnnylee3 09-20-2005, 01:20 AM yea, hahaha
Mikelikes2drive 09-20-2005, 06:45 AM its cause u slam your shifts from gear to gear so roughly... u should shift a little bit more smoothly and ur dropping your clutch.
i think its more the way you drive the car then the car itself.
RotaryNoob 09-20-2005, 07:09 PM I find when I shift slower I have this problem. I think its due to the flywheel RPM's dropping before you let off the clutch. I also remember reading something about this in one of the PCM flashes.
RotaryManiac 09-20-2005, 07:56 PM Its the flywheel rpm's dropping when you shift very slow.
QBallz 09-21-2005, 12:25 PM Don't feel bad I drive like crap at WOT too. I think the key is practice, I know it's helping me shift better and it's fun!
ZoomZoomH 09-21-2005, 12:33 PM ah yet another quirkyness of the rotary engine, a bit more difficult to shift smoothly compared to piston cars, but once you get it, boy is it niice :D
johnnylee3 09-21-2005, 08:42 PM practice makes perfect i guess
R Exotic 8 09-22-2005, 11:34 PM so, i've had my rx8 for a little more than a year now. even after having it for a year, when i drive my car hard there's still a huge jerk. i drove my friends mazdaspeed protege today for the first time, and gunned it and it was much smoother than i've ever done with my 8. i was just wondering, if it was just my driving, or possibly something with the transmission that doesn't allow us to make smooth shifts. any advice would be greatly appreciated :p
Wow, i have the same problem. And i know it's not me because i've been driving standard for 4 years now, and ever since i got the rx-8, i've been feeling the same jerkiness. But people say it's cuz of the rotory motor, so i just lived with it. But if theres a solution to this problem, some 1 please let me know.
ZoomZoomH 09-22-2005, 11:39 PM not really a solution for this, you just need a more delicate touch when changing gears.
think of it as a next-level manual driving training :D
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