Manual Driver Noobie Question?
Aug 17, 2008, 04:20 PM
#1
Manual Driver Noobie Question?
I been driving a Evo X GSR for 3 months now (1st manual car I owned) and most of the time I never let off the gas on 2nd gear when I'm accelerating past 3000rpm to get to 3rd gear. But just recently I rev the 2nd gear to 4500rpm and was about to shift to 3rd gear but the car in front of me braked so I let off the gas immediately and my Evo buckled (jerked back and forth 3-4 times) violently as it felt like the engine is trying to drag the car down. I didn't hit the brakes I just let the Evo coast down in second gear. That violent jerk, is that normal on 2nd gear because I never get that on 3-4-5th gear when I rapidly release the gas pedal at rpm's above 4k. I know that violent jerk comes in 1st gear just I never though I'll experience it on 2nd gear. Anyone has an explanation for this? 
Aug 17, 2008, 04:34 PM
#2
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valid questions if you don't have a lot of stick shift driving experience. Normal cars and trucks with manual transmissions don't behave nearly the same as the evo due to the fact that there is a lot of running gear, but a small motor with a fairly light flywheel.
Another way to say it is the heavy car really works against the small rotating mass and flywheel of the 2 liter. Big trucks with a real heavy flywheel can be started in 2nd and 3rd gear and when you let off the power in the low gears, the whole thing doesn't buck and complain as much. You'll kind of have to learn to drive it different. I had the same kind of problem coming from my 6spd nissan xterra. totally different drivetrain and flywheel weight.
Another way to say it is the heavy car really works against the small rotating mass and flywheel of the 2 liter. Big trucks with a real heavy flywheel can be started in 2nd and 3rd gear and when you let off the power in the low gears, the whole thing doesn't buck and complain as much. You'll kind of have to learn to drive it different. I had the same kind of problem coming from my 6spd nissan xterra. totally different drivetrain and flywheel weight.
Aug 17, 2008, 04:38 PM
#3
valid questions if you don't have a lot of stick shift driving experience. Normal cars and trucks with manual transmissions don't behave nearly the same as the evo due to the fact that there is a lot of running gear, but a small motor with a fairly light flywheel.
Another way to say it is the heavy car really works against the small rotating mass and flywheel of the 2 liter. Big trucks with a real heavy flywheel can be started in 2nd and 3rd gear and when you let off the power in the low gears, the whole thing doesn't buck and complain as much. You'll kind of have to learn to drive it different. I had the same kind of problem coming from my 6spd nissan xterra. totally different drivetrain and flywheel weight.
Another way to say it is the heavy car really works against the small rotating mass and flywheel of the 2 liter. Big trucks with a real heavy flywheel can be started in 2nd and 3rd gear and when you let off the power in the low gears, the whole thing doesn't buck and complain as much. You'll kind of have to learn to drive it different. I had the same kind of problem coming from my 6spd nissan xterra. totally different drivetrain and flywheel weight.
Aug 17, 2008, 08:30 PM
#5
I think you misread what my situation is. I wasn't in the position to shift to 3rd gear because the guy in front of me suddenly hit the brakes. I simply immediately let off the gas and coast to him while still engaged in 2nd gear.
On a side note I do let off the gas when I shift between gears.
On a side note I do let off the gas when I shift between gears.
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Oct 10, 2008, 10:50 AM
#10
It has happened to me in 1st gear when I don't depress the clutch fast enough in these situations but never in second gear. But maybe it is normal because the evo is heavier and mechanically different than my lancer, I guess.
Oct 10, 2008, 11:04 AM
#11
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valid questions if you don't have a lot of stick shift driving experience. Normal cars and trucks with manual transmissions don't behave nearly the same as the evo due to the fact that there is a lot of running gear, but a small motor with a fairly light flywheel.
Another way to say it is the heavy car really works against the small rotating mass and flywheel of the 2 liter. Big trucks with a real heavy flywheel can be started in 2nd and 3rd gear and when you let off the power in the low gears, the whole thing doesn't buck and complain as much. You'll kind of have to learn to drive it different. I had the same kind of problem coming from my 6spd nissan xterra. totally different drivetrain and flywheel weight.
Another way to say it is the heavy car really works against the small rotating mass and flywheel of the 2 liter. Big trucks with a real heavy flywheel can be started in 2nd and 3rd gear and when you let off the power in the low gears, the whole thing doesn't buck and complain as much. You'll kind of have to learn to drive it different. I had the same kind of problem coming from my 6spd nissan xterra. totally different drivetrain and flywheel weight.
If you put in the clutch to shift to 3rd, and then let it out when you realized you needed to stop, that would definitely cause a jerk (of course). Next time, since you're stopping, you should just push in the clutch.
I been driving a Evo X GSR for 3 months now (1st manual car I owned) and most of the time I never let off the gas on 2nd gear when I'm accelerating past 3000rpm to get to 3rd gear. But just recently I rev the 2nd gear to 4500rpm and was about to shift to 3rd gear but the car in front of me braked so I let off the gas immediately and my Evo buckled (jerked back and forth 3-4 times) violently as it felt like the engine is trying to drag the car down. I didn't hit the brakes I just let the Evo coast down in second gear. That violent jerk, is that normal on 2nd gear because I never get that on 3-4-5th gear when I rapidly release the gas pedal at rpm's above 4k. I know that violent jerk comes in 1st gear just I never though I'll experience it on 2nd gear. Anyone has an explanation for this?
Oct 10, 2008, 01:25 PM
#12
Also, at 4500 RPM, you are building boost pressure, then immediately slamming the throttle body closed is going to make the BOV open and dump all your boost. Leaving the clutch engaged leads to what the above posts mention, your jerky sensation.
Oct 11, 2008, 06:02 AM
#13
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^ Correct! Raytrix, you have what we like call the "humpty-bump". Your Evo wants you to get on with the shifting or she'll throw you through the windshield! And as others pointed out, after boost has started to build you must push in the clutch to let things settle down. Holding the gas on between shifts isn't helping either, if you change your mind between gears, push the clutch back in and lift or this will happen every time.
