Is there any way to get rid of the annoying "rev hang" with a tune?
Quote:
Originally Posted by toshibakoludo
^honestly I think some of that is because of the light flywheel.
Uh, no. Lightweight flywheels cause the rpms to drop very quickly once off the gas, which would be the opposite of what's occuring here. Not only that, but the X doesn't have a lightweigth flywheel from the factory, not like an aftermarket true lightweight flywheel, at least. It's ecu programming for sure, or it's something like an idle control valve in conjunction with the ecu.
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Um, on second tought this was what I meant. Now that I think about it can be many different things. Maybe not the light flywheel and it is lighter than most cars out there there is no question there.
http://en.wikipedia.org/wiki/Mitsubi...ncer_Evolution
(Even standard components are considered 'tuned' compared to other vehicles. For instance, the flywheel on normal cars weigh about 12-15 kilograms (26-33 pounds), but Evolution flywheels weigh a mere 6 kilograms (13 pounds) for very quick engine response).
I don't want to argue u got a point but you are wrong about the flywheel. Anyways on with possible causes
http://blogs.edmunds.com/roadtests/2...-rev-hang.html
Originally Posted by toshibakoludo
^honestly I think some of that is because of the light flywheel.
Uh, no. Lightweight flywheels cause the rpms to drop very quickly once off the gas, which would be the opposite of what's occuring here. Not only that, but the X doesn't have a lightweigth flywheel from the factory, not like an aftermarket true lightweight flywheel, at least. It's ecu programming for sure, or it's something like an idle control valve in conjunction with the ecu.
__________________
Um, on second tought this was what I meant. Now that I think about it can be many different things. Maybe not the light flywheel and it is lighter than most cars out there there is no question there.
http://en.wikipedia.org/wiki/Mitsubi...ncer_Evolution
(Even standard components are considered 'tuned' compared to other vehicles. For instance, the flywheel on normal cars weigh about 12-15 kilograms (26-33 pounds), but Evolution flywheels weigh a mere 6 kilograms (13 pounds) for very quick engine response).
I don't want to argue u got a point but you are wrong about the flywheel. Anyways on with possible causes
http://blogs.edmunds.com/roadtests/2...-rev-hang.html
and i think its probably something to do with programing for an easier down shift maybe
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Quote:
Originally Posted by toshibakoludo
^honestly I think some of that is because of the light flywheel.
Uh, no. Lightweight flywheels cause the rpms to drop very quickly once off the gas, which would be the opposite of what's occuring here. Not only that, but the X doesn't have a lightweigth flywheel from the factory, not like an aftermarket true lightweight flywheel, at least. It's ecu programming for sure, or it's something like an idle control valve in conjunction with the ecu.
__________________
Um, on second tought this was what I meant. Now that I think about it can be many different things. Maybe not the light flywheel and it is lighter than most cars out there there is no question there.
http://en.wikipedia.org/wiki/Mitsubi...ncer_Evolution
(Even standard components are considered 'tuned' compared to other vehicles. For instance, the flywheel on normal cars weigh about 12-15 kilograms (26-33 pounds), but Evolution flywheels weigh a mere 6 kilograms (13 pounds) for very quick engine response).
I don't want to argue u got a point but you are wrong about the flywheel. Anyways on with possible causes
http://blogs.edmunds.com/roadtests/2...-rev-hang.html
Originally Posted by toshibakoludo
^honestly I think some of that is because of the light flywheel.
Uh, no. Lightweight flywheels cause the rpms to drop very quickly once off the gas, which would be the opposite of what's occuring here. Not only that, but the X doesn't have a lightweigth flywheel from the factory, not like an aftermarket true lightweight flywheel, at least. It's ecu programming for sure, or it's something like an idle control valve in conjunction with the ecu.
__________________
Um, on second tought this was what I meant. Now that I think about it can be many different things. Maybe not the light flywheel and it is lighter than most cars out there there is no question there.
http://en.wikipedia.org/wiki/Mitsubi...ncer_Evolution
(Even standard components are considered 'tuned' compared to other vehicles. For instance, the flywheel on normal cars weigh about 12-15 kilograms (26-33 pounds), but Evolution flywheels weigh a mere 6 kilograms (13 pounds) for very quick engine response).
I don't want to argue u got a point but you are wrong about the flywheel. Anyways on with possible causes
http://blogs.edmunds.com/roadtests/2...-rev-hang.html
. I realize that the evo comes with a lighter weight flywheel than an average car, but it's nothing compared to a true lightweight flywheel such as one that comes with a racing clutch kit and this is exactly what I said in my first post addressing you. Lightweight flywheels allow to engine to rev quickly for improved response, but also cause the rpms to drop rapidly because of the reduced rotating inertia. Think of it this way; once a heavy wheel starts spinning, the momentum that it builds up is going to be harder to slow down than a lightweight wheel. Same concept, thus why the rpms drop so fast and why that would cause the opposite of what's occuring here. Again, I assure you it's an ecu programming issue with the drive by wire or some kind of idle control valve that's causing the rev hang. It has nothing to do with the flywheel, I assure you.
Last edited by STi2EvoX; Jan 7, 2009 at 04:58 PM. Reason: typo
the rev hang is for emission. So i think it will be hard to take out of the system. They protect those stuff for some reason.
But the tuners can chip in more on that. I just know what i hear when we get to together, even then the ECU part is not even interest me.
But the tuners can chip in more on that. I just know what i hear when we get to together, even then the ECU part is not even interest me.
Sorry to bump this, but I have searched everywhere. I just got my X last week, and this is very annoying. Any remedy yet? Tune, etc? Reminds me when I drove a Civic SI, and supposedly the AP maps for that car remove the hang. Has Cobb done that yet with the X?
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From: FLORIDUH
For what its worth, I noticed when I was looking at the Mitsubishi TSB's somewhere that I saw a bulletin about this. It confirmed that it is for emissions and the car IS supposed to do it.
But, regardless, its very annoying and I would like to disable it as well. Anyone familiar with the Evo X ECU ROM that might know about this?
But, regardless, its very annoying and I would like to disable it as well. Anyone familiar with the Evo X ECU ROM that might know about this?
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From: Los Angeles
just came across this thread while searching for another topic.
so i guess this "rev hang" or whatever you call it is normal. i think i like it, but it's a weird feeling. when in gear and bumper to bumper traffic, i notice i don't have to press on the gas that much in lower gears. when i release the gas pedal, the car holds the rpm for a brief moment before it goes down.
so i guess this "rev hang" or whatever you call it is normal. i think i like it, but it's a weird feeling. when in gear and bumper to bumper traffic, i notice i don't have to press on the gas that much in lower gears. when i release the gas pedal, the car holds the rpm for a brief moment before it goes down.
This could explaining why 1st>2nd shifting is always annoying to me and wasn't an issue in my 8. In normal traffic or when the car is still cold I tend to shift low, around 3k but pretty fast due to the short-throw. This isn't an issue for any other gear but 1st>2nd, though, now I've developed a habit of coming out of first, a wiggle in neutral, then going into 2nd to allow the rpms to come down.
My car rev hangs often during various driving. But...
*After completing a WOT pull and placing the car in neutral, my car will rev hang at around 5K for several seconds, then the car just shuts off?
Now, I am still on the factory tune, so my car is running very, very rich. So if the rev hang is related to emissions, then it makes sense. High idle expending all the unused fuel?
It is truly annoying. I am data logging everything, just haven't had the chance to start tuning the AFR to see if it makes a difference.
Any thoughts?
*After completing a WOT pull and placing the car in neutral, my car will rev hang at around 5K for several seconds, then the car just shuts off?
Now, I am still on the factory tune, so my car is running very, very rich. So if the rev hang is related to emissions, then it makes sense. High idle expending all the unused fuel?
It is truly annoying. I am data logging everything, just haven't had the chance to start tuning the AFR to see if it makes a difference.
Any thoughts?
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