Rev Hang in 5MTs?
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.
Clutch delay valve seems like the most logical answer.
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?
I don't know if any of the throttle controllers affect this. Anyone out there with one to confirm/deny?
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
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
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
PaFitter
Last edited by PaFitter; Feb 25, 2010 at 09:14 AM.
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
PaFitter
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.

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.
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.
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.
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.
I find the throttle lag very annoying myself... but after 12k miles, have managed to somewhat adapt to it.
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.
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.
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.
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!
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.
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.
I think the high engagement point also contributes to this problem.
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).
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.
I've never driven a car that DOES do this as noticeably as the Fit.



