mp3car

Hello. I mentioned something about this in another thread or two, but didn't get much of a logical response so I figured I'd start a new thread on the topic.

I just purchased my 2012 SH 6MT in December and didn't notice this problem during test drives. It's definitely a bit odd behavior in my opinion and it does not seem like it could be caused by the CDV (clutch delay valve). It's not an issue of "holding" RPMs momentarily when i push in the clutch (which would likely be caused by the CDV), but instead, it's an issue of the RPMs actually going UP when i push in the clutch even though the gas pedal is completely released. Someone in one of the other threads mentioned a failing clutch. Granted it may have been abused by the previous owner, it does only have 17k miles on it. The clutch seems to have plenty of life when I test it in various ways, such as launching - neither a clutch dump nor a slip launch shows any sign of wear. Neither does "testing it" by putting it in a high gear and then halfway putting clutch in to slip it and then floor it as I let of the clutch. This "test" on a failing clutch will see the RPMs hover higher than they should be, or even continue to increase without increasing speed as much as it should if it weren't slipping.

What I am suspecting is a delay/lag between the pedal position sensor and the TB actuator, not necessarily something "wrong" but perhaps it's a design issue and I am just being very critical of it. See this video to see what I'm talking about. I was slightly accelerating and then let my foot off and pushed the clutch in at the same time. Of course there's no such thing as EXACTLY the same time, but I am 100% certain my foot was completely off the gas before the revs went up as I pushed the clutch in.

The concern i have is premature failure of the clutch. Not only does the CDV have the potential to put more wear on the clutch by slipping it every shift, but the revs increasing like this when up-shifting also will cause additional wear - as if it's being driven by someone who doesn't know how to drive a manual.

It is very noticeable when driving it hard and shifting at redline. If I'm on it accelerating as fast as possible, it essentially results in a powershift - the practice of not letting off the gas between shifts. I am certain my foot is off the gas pedal when I see the revs increase! Watching the tach, it is exhibiting the EXACT behavior as my previous vehicles would do when powershifting (previous cars include a '94 Integra GSR and a '92 Maxima SE).

Do any other 6MT'ers see this? If you listen carefully to the video, I let off the gas abruptly so it would make a sound when I let off...

mp3car

Not sure why it posted twice with the half-broken link...

justnspace

iTrader: (1)

thats called rev-hang.
its for people who DONT know how to drive a six speed manual transmission.


except, it screws over the people WHO know how to drive a 6mt.


you cannot get rid of this "feature"

justnspace

iTrader: (1)

just researched a little.

rev-hang is implemented in turbo cars to reduce emissions.
totally not sure why Acura and Honda like to include rev-hang in their cars. maybe it is indeed placed there to reduce emissions for Honda.

this issue isnt just isolated to you.

TSX', 3rd gen TL's, honda civic SI's all have this "rev-hang"

CerberusKy

iTrader: (1)

Mine does the same.

ABDomega

My WRX rev hangs. I guess it's why the transition was easy to driving the TL.

I've read that the rev hang in the TL is also due to emissions. There have been a few threads on this issue.

Skier4lyfe303

iTrader: (32)

Yep it's not your driving, it's the car.

Anyone tried one of these (I know the link says TSX, there site doesn't have a TL one not sure why):

http://www.sprintboostersales.com/de...TSX&engine=Gas

This listing has the 3rd gen manual TL but not the 4th:
http://www.ebay.com/itm/SPRINT-BOOSTER-POWER-CONVERTER-FASTER-THROTTLE-RESPONSE-/300361993352?pt=Motors_Car_Truck_Parts_Accessories&hash=item45eef84c88&vxp=mtr

d1sturb3d119

iTrader: (1)

Rev hang and as far as getting rid of it goes, you'll need to flash the ECU and use a custom tune that has eliminated rev hang. The only J series motor I've seen without rev hang has a standalone ECU and he had to do a lot of tuning to get it to run right.

Dat throttle response!