Sometimes when my rpm is around 3000 and I am in first, I let go of the gas and push the clutch pedal down fast the car seems to like lunge forward? I make sure my foot is off the gas and I push the clutch pedal down quickly.

 

Someone correct me if I'm wrong, but I think (think) that the primary function of the clutch is just raising the RPMs like 8 hundred or so. So when you push in the clutch, you hear this mini-revving to keep your engine going at the same speed while you change gears.

I know for a fact that the clutch raises RPMs, just think about idling in gear, you take the clutch out and stall, you leave the clutch in and stay just under 1000 RPMs. That's what you're hearing/feeling. Either that, or both your and my cars have a rather serious problem

 

"I know for a fact that the clutch raises RPMs, just think about idling in gear, you take the clutch out and stall, you leave the clutch in and stay just under 1000 RPMs."


the clutch does raises RPM but only when you want to accelerate fast or race idling in gear..

remember how much gas you put in on last gear so when you shift to next press it at that same spot for smoother shifting. pending on how you release the clutch as well


"Sometimes when my rpm is around 3000 and I am in first, I let go of the gas and push the clutch pedal down fast the car seems to like lunge forward?"

3k rpm is when your car starts revving louder. maybe you shift to slow? you know you dont have to press the the clutch completely down.


other than that you accelerate on first gear to 3k rpm to quick... if you do that then you gotta shift quicker... to maintain the acceleration your going through...

 

Your shifting to high in the rev range & to slow. If im thinking right of what you are saying its like you in the car fly forward a little right? Thats because you a pushing in the clutch to slow. This alows the engine to do some compression brakeing for you. Thats the lunge you fell is the engine dragging you down. So get out there & have that clutch all the way to the floor before you are complety off the gas. Most of the time when I shift I keep gaining a little speed while I put in the clutch & take the next gear, only a few times when I lose speed.

 

That is pretty much entirely wrong.

I'm going to way over simplify this, so don't nit pick my wording anyone. Anyway, what the clutch essentially does is disconnect your engine from your transmission. The clutch does not cause your rpms to rise. When the clutch is in the engine is free wheeling which allows you to change gears with out grinding or have the car stopped without stalling. When you are done changing gears you take your foot off the clutch which reengages the engine to the transmission.

The reason your car lunges forward, bogs down, revs up or any other thing is bad timing between your right foot and your left. Eventually you'll get the hang of the timing and in the mean time don't worry about it because your most likely not hurting anything.

 

Ok, basically this only happens in first gear. I tried it again. If I push the clutch pedal down moderatly everything is smooth. If I push the clutch pedal down fast the engine seems to lunge forward. Only happens in first and only happens if I push the clutch pedal down fast. I make sure my foot is off the gas pedal before I push the clutch. The car lunges forward right when I push the clutch pedal to the floor before you can even shift, what is causing this? It does not happen if I push the pedal down at moderate speeds.

 

PLEASE READ THIS: http://auto.howstuffworks.com/transmission.htm and http://auto.howstuffworks.com/clutch.htm

You're perception of how a transmission works seems to be wrong.

 

First of all you aren't shifting too high in the rev range. How high you shift entirely depends on how fast you are accelerating. Even if you are accelerating relatively slowly 3000 still isn't too high. I think your problem is one that plagues most people when they first learn to drive stick. You are over thinking. I'm guessing every time you shift you run through a mental to do list.

1. lift off gas
2. put in clutch
3. shift gears.
etc....

When you run through the steps one at a time you'll inevitably do everything too slowly. You don't want to lift completely off the gas and then start to push the clutch in. When you lift off the gas, especially in first gear at higher rpms, there is a lot of engine braking (the engine slows the car). So when your foot is completely off the gas the car is slowing substantially. Then when you put the clutch in the engine is no longer slowing down the car so it decelerates at a much slower rate, which makes it feel as though you lunge forward. You aren't actually lunging forward you are just slowing down at a slower rate.

Like I said in my post above, you just need to get the hang of having your left and right feet work together. There's no secret to this, just practice.

 

I am a little confused, I thought you were supposed to release the gas before you push the clutch. Also it does not seem to matter where the RPM is in first. If I am going really slow in a parking lot and push the clutch pedal down fast the engine jerks forward the same. It seems like if i push the clutch pedal down moderatly and not fast it is smooth, but once I push the clutch pedal down fast the engine jerks. This basically only happens in first gear.

 

The reason that you don't feel this when pushing the clutch in slowly is that you get a gradual transition from slowing quickly to essentially not slowing much at all.

Here's an analogy. Lets say you are driving down the free way at 65mph. Suddenly you brake very hard then you abruptly let off the brake pedal. When you suddenly let off the brake pedal it feels as if the car lunges forward, right. Now lets say you are braking hard and you gradually let off the brake pedal. When you do this you don't get that same feeling of lunging forward. Pretty simple physics explains all of this but that is besides the point.

Puttting in the clutch has the same effect as letting off of a brake pedal (for the purposes of my example). The car ceases to rapidly decelerate thus you feel the sensation of lunging forward. This is just an illusion though.

Basically you want to let off of the gas while you put in the clutch. Your feet should be moving at the same time. It isn't a sequential thing.

 

zizi, we've been over this subject with you a lot, but it doesn't seem to be working. Maybe you should consider hiring a driving instructor to sit in the car with you and show you. I know that without someone in the car to help me, it would have been a lot harder for me to pick it up when I learned how to drive a stick (back when great lizards ruled the earth).

 

So if your in a parking lot cruising really slow in first gear without gas, and push the clutch pedal down fast your engine will lunge forward because there is no gas being applied? If I am in a parking lot going really slow without gas and I push the clutch pedal down fast, my engine lunges forward.

 

Ok, can someone explain this. Tonight I was crusing in 2nd gear around 5 mph to test the clutch. I pushed the clutch down fast in 2nd gear and it was fine. Try that same speed, 5mph in first and the engine lunges, 2nd gear any speed fine, 1st gear any speed, lunge.

 

dude you just suck at driving.. J/K

its better releasing the clutch slower on first gear getting off to second....


and wtf it dont make a difference when you press down the clutch, it matters how you release it.


and ofcourse on first gear if you drive off 10mph then release the gas and press it back in, the car will lunge foward.

 

In, none of the examples am I using gas. Coasting in all above examples.

 

i think its because you release the gas..... not pressing down the clutch...


when shift to second release the gas and press down clutch then immediately press down the gas. once the clutch is down enough for you to shift, press a littlebit of gas immediately, shift, then release the clutch slow or the position where its about to stall..

remember the same amount of RPM you had (gas) on first gear and press it back at 2nd gear...

 

The lunge happens as soon as I push the clutch pedal down when it is in first gear.

 

first gear should atleast go up to 10-20mph.....


try starting and release the clutch at stall point (not completely release but enough that the car with move,enough to hit 5 mph) intill you hit 5mph then press the clutch down and shift......


AND STOP ACCELERATING QUICK ON FIRST GEAR that is a problem to

 

What?? It does not matter if I am going slow or accelerating or going 5mph or 20 mph, anytime I push the clutch pedal down in first gear, the car lunges. If I am in 2nd gear and push the clutch pedal down fast, it is smooth. This is my 4th manual transmission car and none others did this.

 

Sigh.. read what someone earlier said. First gear has a lot of engine drag when you get off the throttle, when you engage the clutch you'll be going at a higher acceleration than when in first, because of all the resistance of the engine.