my RPM's bounce around a little when in neutral coasting also. i really don't think it's a problem. (i have a 5speed)

 

yeah mines coasts out of gear at around 1200 rpms. it only goes doen to 800 rpms if in stopped or close to stopped. i wonder if this is normal

 

I noticed that it started happening to me as well after I disconnected and reconnected the battery. It was surprising to me because it never used to do that. I actually searched for this topic and it seems strange that some are having this problem and some are not.

 

It happens to me if the car has been sitting for awhile. Not all the time but everynow and then maybe 5 to 6 times a week. I was gonna search for it but I figured the motor was just cold.

 

Mine does it when I reset the ECU and also sometimes when it's cold... I believe it's part of the Learning mode, as it doesn't do it after a few hours after resetting the ECU. I'm not worried about it... I just coast down in gears when it does it to stop the annoyance...

I'm sure some lame toyota engineer designed it for a reason.

 

the reason to why coasting in neutral is a saftey concern is because you do not have any control over your vehicle. you disengage the transmission from the engine and bascially, you have a car going at whatever speed you were going and not being able to do anything with it. however, you are under control of steering, but as power wise, speed... you do not have any control over that.

but to the main question, yes, i do notice that my rpm bounces while in neutral.

 

I have not heard of that one, it must not be a Cali Law.

Have not seen anything mentioning this in my skimming of THE BOOK!!! Dun Dun Dun

 

Some manual cars hold revs for better shifting. 800 RPM would be close to idle speed. That's a bit low if you're still moving. The ECU works to ensure that you have enough revs in case you need to put it back to gear. This helps you to not stall and to make shifting a bit smoother.

The S2000 has rev holding as well. If you shift in high RPM vtec, the car will hold the rev above the 6000 RPM so you're still using the hot cam. Remember how the earlier versions of the 2ZZ-GE in the Celica would fall out of lift when you shift at or close to the red line? Well, rev holding helps in that application.

Smoother shifts, more power on tap, less stalls.

 

Mine bounces too, and i am always cruising in neutral. why accelerate down a hill when you can drift, seems to save gas to me. if i am going down a slight hill in 5th gear i will continuely slow down, but if i put in in nuetral i will accelerate. So F the police, just pay attention to traffic so you have enough reaction time to use the brakes.
how can you say you are not in control of the car because you are out of gear???? If you are in 5th gear going 60 and you have to slam on your brakes, the engine braking is only going to help slowing you down to maybe 45(and even with that its hardly helping), then its all on your brakes, unless you are downshifting while slamming on the brakes, which is super unlikely. So this law seems bogus to me -- like many other laws i guess

 

cruising in neutral does NOT save gas as MOST people would think. if you actually stay in gear and the let the engine brake do its job, you're actually saving more gas that way cuz no air in getting into the throttle and while cruising in neutral, you are idiling your car which uses up gas. if you don't believe it, go ahead and search all those manual driving tips on google. i've been there and done that with factual facts. and if you need to slam on your brakes, then do it. no one said that engine brake will do it for you if you need to come to an immediate stop.

 

what i was saying is that since the engine in gear slows the car down when i don't want to, i have to keep my foot on the gas to go the same speed i could drift, in this case i am pretty sure drifting would save gas

 

that's why you shift up when the lower gear is slowing you down.

 

First, TrafficinLA thats not what we are talking about in regards to holding revs, we are talking about a significant bounce in the RPMs that sometimes occurs, then goes away.

Second, 7thgear is right that riding in neutral does not save you gas (contrary to popular belief). If you are in gear (doesn't matter which) and you let go of the gas pedal, your fuel injectors turn off and your engine begins braking (that saves you gas). They do turn back on however at a certain point (like when you are in 1st and your just going a couple of miles per hour without pressing the gas) but that point is very low, close to the idle speed (which is why you are wasting gas when you are in neutral, your injectors are spraying so the engine does not turn off while disengaged from the gears).

 

illegal or not, i keep my car in first at stop lights with the clutch depressed. that way, if i get rear ended i dont end up rolling into the middle of the intersection and possibly getting t-boned. you all should think about this. i just do it naturally now. =)

 

Maybe your car is special, but i have been refering to 5th gear, and for some reason my tC didn't come with unlimited gears.

Maybe my scenario isn't painting a vibrant picture for some of you, or else you just aren't reading what i am saying, either way i'll take it to the extreme so you can see my point.
Lets say there is a super steep hill, like 25% grade, and you want to go fast down it, lets say 100 mph. If you keep the car in 5th with it in gear and don't have your foot on the accelerator, you probably won't go much faster than between 50-70mph. so you would have to accelerate the car to overcome the engine braking, however if you just coasted. you could go the 100mph while only using the amount of fuel it takes to idle, which isn't much

 

You are right, if it's a very steep hill. But 5th gear doesnt have much breaking power so you have to find the optimum balance between going fast or saving gas, which was you initial point.

 

bump, i've had bouncing rpms before. But this morning was much more dramatic than before. I accidentally skimmed a curb earlier on the way to work, then, when i got off the hiway, the tach started bouncing from 700-1500. Very deliberate revs, like someone was actually blipping the throttle repeatedly the exact same way.

 

I also noticed this when I was out "ghost riding my whip" the other day.. I was break dancing and hip-hopping, and I just couldnt belive it.... I then tried to ghost ride UP a hill,to see if it would do the same thing, and my car rolled back onto my face. - I broke my nose, and ears.. but I can still drink beer so its ok.


Ghost riding is so cool, I think it could be the ghost that is pressing the gas pedal a bit to mess with me when im in neutral. I wouldnt worry about it too much, because I cant really see the tach when I am in my moonwalker mode.



-oh yeah.. and im kidding..- If i catch a little bastard ghost riding in my neighboorhood I will push him in FRONT of his honda...lol..

 

LOL way to threadjack a dead thread.

 

menace549, nice name