2nd Generation (GE 08-13) 2nd Generation specific talk and questions here.

Rev Hang in 5MTs?

Thread Tools
 
Search this Thread
 
Old Feb 24, 2010 | 10:02 PM
  #21  
Type 100's Avatar
Member
Joined: Jan 2009
Posts: 1,888
From: Parañaque City, Philippines
5 Year Member
I don't think you can blame the DBW throttle for this, because I also get "rev float" despite having a cable on the throttle butterfly. Our GDs never had DBW

Clutch delay valve seems like the most logical answer.
 
Old Feb 24, 2010 | 10:13 PM
  #22  
Steve244's Avatar
Member
Joined: Aug 2009
Posts: 3,661
From: Georgia
5 Year Member
Originally Posted by rhyneba
Hear, Hear! Emissions do drive this, a rapidly closed throttle does not scavenge well and has a steep spike in certain emissions components. The rev hang also makes shifting a little smoother for less-skilled drivers, probably keeps the engine mounts healthier longer as well. The behavior of Honda's drive-by-wire is another reason I picked my Fit with my first AT for a daily driver.

I don't know if any of the throttle controllers affect this. Anyone out there with one to confirm/deny?
The "throttle controllers" just alter the input from the accelerator pedal, so I don't see how they could. They are the electronic equivalent of putting a block of wood on the pedal.
 
Old Feb 24, 2010 | 10:46 PM
  #23  
hyperfit's Avatar
Member
Joined: Aug 2009
Posts: 168
From: Iowa
5 Year Member
I noticed it too, but I'm used to it now.
 
Old Feb 25, 2010 | 12:27 AM
  #24  
fitisbamf's Avatar
Member
iTrader: (1)
Joined: Jun 2009
Posts: 718
From: san diego, ca
honestly if u hate it u need to find out what slave and master cyl. will work in place of the fits


then get an intake and exhaust it helps idk how it helps but mine doesnt rev hang as much in fact every now and then i see the rpm drop and it suprises how fast it falls
 
Old Feb 25, 2010 | 09:11 AM
  #25  
PaFitter's Avatar
Member
5 Year Member
Joined: Jul 2009
Posts: 136
From: York, Pa
My God, the delayed De-acceleration of the throttle has been on cars/trucks since the 70's for pollution control. Was vacuum operated then,electronic now. Everyone was right who said it is to clear up unburnt fuel,and particulates is right. It helps with smoother drivability as well for untrained manual drivers, like was also stated. Typical feeling for the last several manual cars I have owned ,and don't even notice it anymore.

PaFitter
 

Last edited by PaFitter; Feb 25, 2010 at 09:14 AM.
Old Feb 25, 2010 | 09:37 AM
  #26  
Steve244's Avatar
Member
Joined: Aug 2009
Posts: 3,661
From: Georgia
5 Year Member
Originally Posted by PaFitter
My God, the delayed De-acceleration of the throttle has been on cars/trucks since the 70's for pollution control. Was vacuum operated then,electronic now. Everyone was right who said it is to clear up unburnt fuel,and particulates is right. It helps with smoother drivability as well for untrained manual drivers, like was also stated. Typical feeling for the last several manual cars I have owned ,and don't even notice it anymore.

PaFitter
mmmm the dashpot has been on carburetors since the 60's (maybe earlier but that's as far back as I go). Its original purpose was to avoid stalling; it held the throttle plate open slightly and closed it gradually upon abrupt release of the accelerator. It may have evolved into an emissions control but the manual transmission cars I owned through the 90's did not behave this way. They were fuel injected so they didn't have this device. They did have something called an Idle Air Control valve (I think is missing from DBW Fits) that probably did something similar, but not as marked as what the current Fit does.

I think the "rev hang" people are talking about on Honda's is severe. Enough to make me think there was something wrong with the MT Fit when I test drove it.

I question the need for "rev hang" in modern fuel injected cars, but it's definitely there so I'm sure it serves some purpose.
 
Old Feb 25, 2010 | 02:03 PM
  #27  
nothing's Avatar
Member
Joined: Oct 2009
Posts: 106
From: Canada
Originally Posted by Steve244
I think the "rev hang" people are talking about on Honda's is severe. Enough to make me think there was something wrong with the MT Fit when I test drove it.
I agree. I have driven many, many, many manual transmission cars (from various manufacturers that weren't my personal vehicles) in my life and the Fit is the only one where the rev-hang has been this noticeable. I don't doubt that many other manufacturers do this, but if they do, it's not as pronounced. I personally have found the hanging revs hard to get used to, and I have had to alter the way that I shift gears to compensate. I still haven't got the 1-2 shift down 100% of the time.

All of my previous fuel injected Honda's ('95 Accord / '98 Civic / '99 Accord) didn't have this "feature", and neither did my more recent Subaru vehicles.

I've heard it's really bad on the new(er) Si's as well.
 
Old Feb 25, 2010 | 03:43 PM
  #28  
MiMi1's Avatar
Member
5 Year Member
Joined: Jan 2009
Posts: 95
From: Queens NY
This happened to me for the 1st 2 months of ownership. Purely driver error. I have an M3 as well so I know the same doesnt happen there.
 
Old Feb 25, 2010 | 03:59 PM
  #29  
mynameisphunk's Avatar
Member
Joined: Jul 2009
Posts: 114
From: Hanover, PA
The rev hang has actually gotten more annoying to me now (after 6 months and 23k miles) than it was when I first bought the car. The lower the RPM at which you shift, the longer it hangs. Frustrating, especially after hopping out of my Miata, which is extremely rev-happy and whose RPM drops immediately, and getting into the Fit.

I'll eventually consider an ECU reflash if any companies address this in the aftermarket.
 
Old Feb 26, 2010 | 04:15 PM
  #30  
nothing's Avatar
Member
Joined: Oct 2009
Posts: 106
From: Canada
Originally Posted by mynameisphunk
I'll eventually consider an ECU reflash if any companies address this in the aftermarket.
I've got my fingers crossed for this! Or even if Honda decides to "fix" the issue similar to what they did for the '06 (I believe it was) Civic's.
 
Old Feb 26, 2010 | 04:33 PM
  #31  
cargun's Avatar
Member
Joined: Aug 2009
Posts: 51
From: NY
I reprogrammed myself to lift off the gas completely before I touch the clutch pedal. That allows me to do a normal speed shift and not have to feather the clutch to bring the RPM's down smoothly in the next gear.

I find the throttle lag very annoying myself... but after 12k miles, have managed to somewhat adapt to it.
 
Old Feb 27, 2010 | 11:04 AM
  #32  
FITProject's Avatar
Member
iTrader: (3)
Joined: Nov 2009
Posts: 315
From: Massachusetts
There must be a clutch delay valve somewhere in the system. The lazy accelerator makes the issue worse, but a quick, but smooth 1-2 shift is sometimes hard to pull off because of the relative delay between releasing the clutch and the clutch actually grabbing. I find myself slipping the clutch more coming off the line in 1st just to make it a little less jerky. A throttle controller or even a Hondata-esque re-flash would be great.
 
Old Feb 27, 2010 | 11:41 AM
  #33  
Red 05's Avatar
Member
Joined: Aug 2009
Posts: 1,120
From: Tuscaloosa
5 Year Member
It was a big departure from a direct mechanical link to a digital pedal when I made the switch, and I kept racing the engine against the clutch for the first 500 miles, but it's alot smoother than my Cruiser ever was.
 
Old Feb 28, 2010 | 12:49 AM
  #34  
dgs's Avatar
dgs
Member
Joined: Feb 2009
Posts: 232
From: Texas
Originally Posted by FITProject
There must be a clutch delay valve somewhere in the system. The lazy accelerator makes the issue worse, but a quick, but smooth 1-2 shift is sometimes hard to pull off because of the relative delay between releasing the clutch and the clutch actually grabbing. I find myself slipping the clutch more coming off the line in 1st just to make it a little less jerky. A throttle controller or even a Hondata-esque re-flash would be great.
Actually I totally agree. After more than a year of driving this car I still have trouble keeping the 1 to 2 shift smooth. It requires way too much concentration on my part and is one of the few things I don't like about the car. The technique of completely releasing your foot from the throttle before releasing the clutch produces the smoothest technique, thus I rev pretty high in 1st gear to compensate for the delayed response for the 2 shift.

Rev matching is also interesting in this car. When I blip the throttle to downshift the revs hang up there for a long time, so I can take my time getting the car in a lower gear and letting out the clutch. In other manual transmission cars I have owned this technique needs to be performed in one fluid, quick motion. I'm still used to that and thus find myself in gear and hitting the throttle before the revs have actually fallen to match the speed of the gears, which produces a bit of a lag at times. Very annoying!
 
Old Feb 28, 2010 | 10:24 AM
  #35  
rhyneba's Avatar
Member
Joined: Nov 2009
Posts: 250
From: Eastern, NC
I've searched the parts catalog for any such part or switch for GEs and haven't found anything. The throttle is controlled entirely electronically on GEs. As some other poster referenced there was a bulletin for 06 Civic Sis for an PCM flash to reduce it. IMO the only way to change it is at the PCM level.
 
Old Mar 1, 2010 | 12:09 AM
  #36  
IN2TURBOS's Avatar
Thread Starter
|
Member
5 Year Member
Joined: Feb 2006
Posts: 85
From: Norman, OK
Maybe if we all call Honda Customer Service they will release a fix like they did with the 06 Si's! Yeah, I remember reading about the SI problem as well since I was looking at getting one in 06.
 
Old Mar 1, 2010 | 10:17 AM
  #37  
nothing's Avatar
Member
Joined: Oct 2009
Posts: 106
From: Canada
Originally Posted by dgs
Actually I totally agree. After more than a year of driving this car I still have trouble keeping the 1 to 2 shift smooth. It requires way too much concentration on my part and is one of the few things I don't like about the car.
Agreed. I've never had to concentrate on producing a smooth 1-2 shift in any of my previous driving experiences (save for the initial learning process). More often than not I find myself either slipping the clutch or jerking the car instead of having a nice smooth shift.

I think the high engagement point also contributes to this problem.
 
Old Mar 1, 2010 | 11:27 AM
  #38  
mynameisphunk's Avatar
Member
Joined: Jul 2009
Posts: 114
From: Hanover, PA
The 1-2 shift is the main problem shift for me as well. I know I've annoyed the automatic transmission drivers behind me when leaving a stoplight as I wait seemingly forever for the RPM's to drop from 1-2, so when I'm in that situation I end up revving higher in 1st than I would normally (and higher than the car needs to for my rate of acceleration) specifically to try to minimize this issue, and end up slipping the clutch more than I would normally on the shift to 2nd gear (I would normally just let the clutch out exactly at the proper RPM to minimize clutch wear).
 
Old Mar 1, 2010 | 11:53 AM
  #39  
Vash's Avatar
Member
Joined: Aug 2009
Posts: 1,053
From: North Carolina
5 Year Member
its funny you mentioned this, i haven't ran into a manual transmission car made after the 90's that does not do this.
 
Old Mar 1, 2010 | 01:34 PM
  #40  
mynameisphunk's Avatar
Member
Joined: Jul 2009
Posts: 114
From: Hanover, PA
My '04 xB did not do this, my previous Mazda 3s 2.3L didn't do this, father's 2008 Rabbit 2.5L doesn't do this as noticeably, wife's '07 Impreza Outback Sport doesn't do this, 2000 Golf didn't do this, etc....

I've never driven a car that DOES do this as noticeably as the Fit.
 



All times are GMT -4. The time now is 03:20 AM.