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Discussion Starter · #1 ·
Just picked up a manual transmission model and noticed HORRIBLE rev hang. It will hang at 6500 RPMs when I am accelerating hard and shifting through the gears. I've never had anything like this happen before. It happens at lower levels of acceleration as well, but doesn't hang at redline.

Anybody else?
 

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Huge issue with the 9th SI.Flash Pro eliminated it on my 9th K2.4.
 

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This is the result of "fly by wire". There is no mechanical linkage between accelerator pedal and throttle body. The TPS (throttle position sensor) sees the position of the accelerator and sends the request to the ECU (engine control unit). The ECU runs the request through its algorithm, and if all other conditions are met, it will signal the throttle body to open, close, or remain steady. The lag between your input (right foot) and the response from the throttle body is entirely software. After driving manuals for many years (with direct connections between pedal and throttle body), it's disconcerting to drive and shift with the "fly by wire" because of the lag, and makes the "three pedal dance" awkward and difficult to achieve smooth shift transitions.
I'm pretty sure the programmers could alleviate much of this lag, but due to requirements for safety, economy, emissions, etc., the "nanny" ECU knows what's best. :(
 

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You're lucky you can get to 6500 rpms, the CVT tranny Civics can't get that high, I wouldn't mind a rev hang at 6500, lol :)


On a side note lots of fly by wire cars exhibit this issue as noted above, my Jeep does the same thing at various rpms.
 

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You're lucky you can get to 6500 rpms, the CVT tranny Civics can't get that high, I wouldn't mind a rev hang at 6500, lol :)


On a side note lots of fly by wire cars exhibit this issue as noted above, my Jeep does the same thing at various rpms.
Have you tried driving in "L" mode? I heard you could get to redline in "L" whereas the D and S modes shift before hitting readline. Honestly, i noticed with this new engine that the torque curve drops off around 6000 rpm anyway, so not as much power to be had up that high, better to stay lower in the optimal rev range for this particular engine.
 

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Discussion Starter · #7 ·
You're lucky you can get to 6500 rpms, the CVT tranny Civics can't get that high, I wouldn't mind a rev hang at 6500, lol :)


On a side note lots of fly by wire cars exhibit this issue as noted above, my Jeep does the same thing at various rpms.
I am getting used to it. It actually lets me get up close to 7000 RPMs. I am not sure where the rev limiter is, but I noticed it let me go past where the red line starts.
 

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L mode going up my mountain roads is SAVAGE! L mode is probly the mode you want to race with.. keeps high rpm eliminating shifting. kinda a cheater mode hahahaha
 

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it's a civic....most won't be racing their dd's. and your cvt probably won't last long if one continues to race in 'L' mode. but, feel free to give it a try, to each their own
 

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Not so surprising, it's an emissions thing. Closing the throttle quickly creates a spike in crankcase pressure, putting more oil through the PCV valve and increasing NOx. Sounds like subarus, VWs and some Hyundais get the same programming when they are imported to the US. Apparently the manufacturers are worried about getting sued for violating emissions in real world driving.

Installing an oil catch can, retuning the throttle map, and watching your oil level will get rid of it without any adverse effects.

My other Honda, a CR-Z, is the same. If you don't want to mess with the ECU, sooner or later you'll just get used to lifting off the throttle a bit earlier than you would normally and it becomes a non-issue. At least it did for me. Been living with it for 6 years and barely notice it now in the civic.
 

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Not so surprising, it's an emissions thing. Closing the throttle quickly creates a spike in crankcase pressure, putting more oil through the PCV valve and increasing NOx. Sounds like subarus, VWs and some Hyundais get the same programming when they are imported to the US. Apparently the manufacturers are worried about getting sued for violating emissions in real world driving.

Yep. We never had this problem with a mechanical connection to the throttle body...only after they went to the frikkin drive-by-wire which places the ECU between the throttle pedal and the engine. Isn't technology wonderful (tongue in cheek)?
 
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