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Is there any way to get rid of the annoying "rev hang" with a tune?

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Old Jan 4, 2009 | 12:13 AM
  #16  
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Glad I am not the only one annoyed with this.
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Old Jan 4, 2009 | 05:34 AM
  #17  
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i hate it.
Also the drive by wire never gives you a same cable feel. As soon as they have a solution for it, i will change it .
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Old Jan 4, 2009 | 07:27 AM
  #18  
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+1000! I need to disable it
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Old Jan 4, 2009 | 08:47 AM
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Are any of you guys getting a CEL at all with the revs hanging? I have only noticed it our EVOX when we have a CEL and I can't recall the code off the top of my head for the code it trips.

I'll try to pay attention tomorrow when I drive the car again to see if our car does it. I don't remember it. The drive by wire settings in our EVO X have been changed in the ECU. We have the throttle going to WOT at lower loads. Watching the scan tool I have been using it seems to have changed the throttle opening and the throttle in the car feels much better to me than it did originally.

I prefer a simple cable driven throttle myself.
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Old Jan 4, 2009 | 09:10 AM
  #20  
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Nope, no CEL's (at least in my case). I also have what STi2EvoX reports:


Originally Posted by STi2EvoX
It's more when inching the car up in stop and go traffic or moving into a parking space that it irritates me.

Since I'm only moving the car up a foot or two at a time, the clutch never gets fully let out, so what happens is that I'll let the clutch out to the engagement point, blip the throttle a couple times as I let it out a bit more, but then push the clutch back in to get ready to stop again and even though I'm not on the gas anymore, the damn rpms won't drop. That's annoying.
You should be able to reproduce this in neutral. Simply hold your revs at like 4k, then let your foot off the gas. A stock GSR will just hang out and drop really slowly.

Last edited by flagg77; Jan 4, 2009 at 04:30 PM.
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Old Jan 4, 2009 | 09:12 AM
  #21  
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Nope, haven't gotten a CEL yet.
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Old Jan 4, 2009 | 09:38 AM
  #22  
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This happens to me too.
I floor it in 4th to about 6000 rpms, let off throttle and it's like cruise control, it just stays their
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Old Jan 4, 2009 | 09:45 AM
  #23  
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Originally Posted by flagg77
Nope CEL's (at least in my case). I also have what STi2EvoX reports:




You should be able to reproduce this in neutral. Simply hold your revs at like 4k, then let your foot off the gas. A stock GSR will just hang out and drop really slowly.
Yeah, I know. In my first post I commented on it doing it in neutral as well. I was just saying that since I don't ever sit there and rev my car really, that it's mostly just when inching up in stop and go traffic or moving into a parking space that I notice it, and it drives me crazy in these scenarios. I love my car, I really do, but there are a few things that I really, genuinely, hate about it, and this one of them. Oh, mitsubishi... why, why, why do you these things to us?
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Old Jan 4, 2009 | 10:15 AM
  #24  
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Originally Posted by davidbuschur
Are any of you guys getting a CEL at all with the revs hanging? I have only noticed it our EVOX when we have a CEL and I can't recall the code off the top of my head for the code it trips.

I'll try to pay attention tomorrow when I drive the car again to see if our car does it. I don't remember it. The drive by wire settings in our EVO X have been changed in the ECU. We have the throttle going to WOT at lower loads. Watching the scan tool I have been using it seems to have changed the throttle opening and the throttle in the car feels much better to me than it did originally.

I prefer a simple cable driven throttle myself.
no cel light. only sometimes the ASC light pops up. But when you shut the car off, it disappears. Maybe related to my no TPMS wheel set up.
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Old Jan 4, 2009 | 10:16 AM
  #25  
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the worst is when you two step it. It hangs like crazy around 5000k and drops sloooowly to 4000 then drops all the way down.
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Old Jan 4, 2009 | 10:22 AM
  #26  
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Yes when you do two step it it hangs up there like crazy i thought my throttle cable was stuck at one point this is very annoying ... I dont have problems downshifting to slow the car down like someone said in the previous post the rpm do not stay up there at all its only at a standstill when you rev the car past 3000 rpm ...
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Old Jan 4, 2009 | 11:46 AM
  #27  
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This is my most hated issue i have with the evo x.

My MS3 had the same issue but it wasnt nearly as bad and its just the drive by wire. Apparently people were able to manipulate the response which got rid of the delay and the hang.

Im not the best driver but I do believe its causing me major issues with clutch wear since its still pulling with my foot off the gas and the clutch still party engaging.

Its not to hard to adjust your shifting technique but its just another variable which takes away from the immersion and personal control of the vehicle the driver should have.

I now have the accessport stg1 installed and the issue hasn't gone away.

Its also more of an issue when trying to get into reverse in -30C weather. But thats a combination of things.

I dont think the hang is a result of the extra fuel burning, its the opposite like has been mentioned.

My car also does it whether its hot or not. The ambient temperature doesnt matter that much either.
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Old Jan 4, 2009 | 01:20 PM
  #28  
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Do any of you guys have a boost/vacuum gauge in your car? Can you try to note the vacuum reading the car has when this happens and the rpm it was at and then what RPM it hangs at? I'll look at the map and see if see something in there that can be changed.
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Old Jan 5, 2009 | 02:00 AM
  #29  
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The rev hanging happens on my fq360 (I.e a Uk car - so this is a widespread annoyance). Not normally noticeable, until you do a slow maneuver (e.g 3-point turn, in and out of parking spaces, etc) .... Then it keeps holding the revs for about 2 secs after you take the foot off the gas. It's not a problem, it just makes you sound like a monkey who has no pedal control.

Never had an issue downshifting, and revs aren't held that high .... About 2.5k to 3k.
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Old Jan 5, 2009 | 04:06 AM
  #30  
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Originally Posted by davidbuschur
Do any of you guys have a boost/vacuum gauge in your car? Can you try to note the vacuum reading the car has when this happens and the rpm it was at and then what RPM it hangs at? I'll look at the map and see if see something in there that can be changed.
David,

This is one area of the tune we have not "messed with" much using EcuTek tools. My 10 has a full compliment of innovate gauges (boost/vac, wide band, egt) that can be logged via EcuTek along side all the regular ecutek parameters.

To date, my observation has been that the "rev hang" is related more to the change in throttle position than any thing else. That is to say that if you are lugging along in traffic at say 20% throttle and then lift off afr will dip into the 12's to 13's under full vacuum (vacuum reading maxed out) and the car will "coast" along for a few seconds until the wide band goes full lean and the engine breaking kicks in. During the "rev hang" if you blip the throttle (car still in gear and clutch still engaged) it will immediately go full lean and engine breaking kicks in.


So, at least from what we have observed, when the change in throttle position is small as you lift off it will tend to rev hang. If on the other hand you step off the throttle at say 75% throttle, it does not hang at all.

A couple other observation, when I was dialing in the upgraded injectors (RC 750cc) the hang was a little worse and more noticable than it is now that the injectors are dialed in. Also, I had the vacuum / pressure line pop off the fuel pressure regulator a while back and noticed then that the hang was real bad. These two things make me think the hang is injector pulse width related.....
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