General Fit Talk General Discussion on the Honda Fit/Jazz.

High Revs in the Fit

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  #21  
Old 08-31-2011 | 08:06 AM
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I sometimes can't wait to go to work, just to drive Fitoo!
 
  #22  
Old 08-31-2011 | 04:05 PM
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Originally Posted by Krimson_Cardnal

If the shifts are smooth and quick all is good. It will become second nature after a while and you'll know it all by the sound of the engine and feel of the car - the tach is more of a distraction.
very true. my first car didnt have a working tach, so i learned to drive that way. I rarely look at the tach now either. once you are super comfortable you will drive my sound. occasionally i will if i am REALLY trying to get as close as possible to red line, but not usually. ive only ever hit the fuel cutoff like twice... out of the hundreds of times ive wrung it out.
 
  #23  
Old 09-14-2011 | 03:15 PM
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It's interesting. I've noticed that every SOHC Honda I've driven (the Fit included) has a considerable delay between hitting the clutch and the RPMs falling between shifts. In my DOHC CRX, you hit the clutch, and the revs start to fall _immediately_. You have to shift fast or you'll miss the correct RPM for the next gear. However, if you shift at a much higher rev, the RPMs will fall much sooner, as though it knows you're trying to race. I'm sure there's some physics involved that would explain this. Personally, I wish the RPMs would fall a bit quicker between shifts when driving leisurely. I don't like having to wait a second or more before re-engaging the clutch.
 
  #24  
Old 09-14-2011 | 03:22 PM
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^ lightweight flywheel solves that
 
  #25  
Old 09-14-2011 | 03:27 PM
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Originally Posted by doctordoom
^ lightweight flywheel solves that
Makes perfect sense. Maybe in 4 years after my warranty is up I'll replace mine
 
  #26  
Old 09-14-2011 | 03:28 PM
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make vids sorry guys im more a visual learner and i want to knw if anything is wrong although i only drive stick and my only track car i every had was and Ep3 which had a dohc but im not so sure bout sohc ivtec engines please also enlighten me thank you
ill also try to make a vid for myself
 
  #27  
Old 09-14-2011 | 04:10 PM
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Originally Posted by neutral
It's interesting. I've noticed that every SOHC Honda I've driven (the Fit included) has a considerable delay between hitting the clutch and the RPMs falling between shifts. In my DOHC CRX, you hit the clutch, and the revs start to fall _immediately_. You have to shift fast or you'll miss the correct RPM for the next gear. However, if you shift at a much higher rev, the RPMs will fall much sooner, as though it knows you're trying to race. I'm sure there's some physics involved that would explain this. Personally, I wish the RPMs would fall a bit quicker between shifts when driving leisurely. I don't like having to wait a second or more before re-engaging the clutch.
Well if all the sohc cars you are referring to are newer, its because of the electronic throttle and the "rev-hang" present in newer cars. If some were older, then I dont know what to tell you lol


Originally Posted by Pang3t
make vids sorry guys im more a visual learner and i want to knw if anything is wrong although i only drive stick and my only track car i every had was and Ep3 which had a dohc but im not so sure bout sohc ivtec engines please also enlighten me thank you
ill also try to make a vid for myself
For what? howyou should shift in the fit? or like how it revs? sorry, think Im just misunderstanding what you are asking
 

Last edited by SSMTEN; 09-14-2011 at 04:15 PM.
  #28  
Old 09-14-2011 | 04:15 PM
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Originally Posted by SSMTEN
Well if all the sohc cars you are referring to are newer, its because of the electronic throttle and the "rev-hang" present in newer cars. If some were older, then I dont know what to tell you lol
Yeah I'm referring to the older CRX's and Civic's I've driven, which are obviously cable throttle. Drive by wire is a whole 'nother animal I am not fond of. The rev hang on the older cars could've been due to ignition timing being off though... Always seem to end up with cars missing the lower timing belt cover :/
 
  #29  
Old 09-14-2011 | 04:30 PM
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Originally Posted by SSMTEN
Well if all the sohc cars you are referring to are newer, its because of the electronic throttle and the "rev-hang" present in newer cars. If some were older, then I dont know what to tell you lol
he was talking about the revs dropping when you disengage the clutch, so nothing to do with drive-by-wire or electronics, also it's a CRX
 

Last edited by doctordoom; 09-14-2011 at 04:33 PM.
  #30  
Old 09-14-2011 | 04:37 PM
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Originally Posted by doctordoom
he was talking about the revs dropping when you disengage the clutch, so nothing to do with drive-by-wire or electronics, also it's a CRX
Actually, drive-by-wire does effect the revs dropping after disengaging the clutch. If you are used to driving a "normal" car, you would typically let off the throttle and disengage the clutch at about the same time to prepare for a shift. Typically this would immediately close the intake valve, and the engine would start revving down. Drive-by-wire systems tend to add a bit of "throttle lag", so that when you let off the gas, the car may take a second or so before it actually closes the intake valve. Not only does this sometimes introduce rev hang, but in some cases the engine will actually accelerate before starting to decelerate since there is a period of time where the clutch is disengaged but the drive-by-wire system hasn't actually closed the intake yet. This is especially present in Scion TC's. The throttle lag (both for pressing and letting off the gas) is enormous, and makes shifting extremely tiring.
 
  #31  
Old 09-14-2011 | 04:41 PM
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Rev 'hang' is built into the ECU. Part of the EPA emission reduction.
 
  #32  
Old 09-14-2011 | 04:45 PM
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Originally Posted by Krimson_Cardnal
Rev 'hang' is built into the ECU. Part of the EPA emission reduction.
..another reason we need a re-flash available. (there still isnt one available for us right? i havent been keeping up as much lately. might have missed something)
 
  #33  
Old 09-14-2011 | 05:09 PM
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JC is right about rev lag being controlled by the ECU... I had forgotten all about it until seeing this thread... My ECU was reflashed by Hondata early last summer as part of the KWSC high boost kit.
 
  #34  
Old 09-14-2011 | 06:23 PM
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Originally Posted by neutral
Actually, drive-by-wire does effect the revs dropping after disengaging the clutch. If you are used to driving a "normal" car, you would typically let off the throttle and disengage the clutch at about the same time to prepare for a shift. Typically this would immediately close the intake valve, and the engine would start revving down. Drive-by-wire systems tend to add a bit of "throttle lag", so that when you let off the gas, the car may take a second or so before it actually closes the intake valve. Not only does this sometimes introduce rev hang, but in some cases the engine will actually accelerate before starting to decelerate since there is a period of time where the clutch is disengaged but the drive-by-wire system hasn't actually closed the intake yet. This is especially present in Scion TC's. The throttle lag (both for pressing and letting off the gas) is enormous, and makes shifting extremely tiring.
You're right, I thought you were just talking about how the revs don't drop as quickly when you disengage the clutch (like engine braking, then disengaging the clutch).
 
  #35  
Old 09-14-2011 | 08:58 PM
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bull ill show u the fastest reving fit, the dbw doesnt rev hang.... with straight exhaust and high flow intake my fit is super throttle responsive.... then i got a pretty nice flywheel with a decent amount of weight removed... my fit is crazy and i dont have a throttle controller... i dont believe in it sorry.
 
  #36  
Old 09-14-2011 | 09:12 PM
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I believe in nothing.... Nothing is sacred.
 
  #37  
Old 09-14-2011 | 09:20 PM
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Originally Posted by doctordoom
You're right, I thought you were just talking about how the revs don't drop as quickly when you disengage the clutch (like engine braking, then disengaging the clutch).
Ah gotcha. Out of curiosity, how does the ECU help with EPA BS by causing rev hang? By making it less fun to drive? lol
 
  #38  
Old 09-14-2011 | 09:40 PM
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Originally Posted by neutral
Ah gotcha. Out of curiosity, how does the ECU help with EPA BS by causing rev hang? By making it less fun to drive? lol
It just makes em feel better by effing us in the A with stupid standards that are complete BS. Put that crap on a prius, don't put it on my car and if you do give me the option to take the shite off!
 
  #39  
Old 09-15-2011 | 03:14 PM
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Originally Posted by neutral
Ah gotcha. Out of curiosity, how does the ECU help with EPA BS by causing rev hang? By making it less fun to drive? lol
lol.... It's still fun.

From what I remember when it was discussed this on the forums a few yrs ago, it has something to do with burning off the excess gas in between shifts.
see these threads for more info :
https://www.fitfreak.net/forums/2nd-...-response.html
Originally Posted by cab0053
I heard the reasoning behind that is so the engine can burn the rest of the gas (in the chamber?) to make it more fuel efficient.
Originally Posted by No_Skillz
He's right. If the throttle plate were simply to slam shut (like on most cars), the engine would run very rich for a second. You will notice a hang or even a small bump in rpms when you let off (esp in M/Ts) as the fit motor burns all the fuel to lower emissions and preserve parts.

I just forced myself to get used to it. Hey, I'm saving the f'n planet here.
https://www.fitfreak.net/forums/2nd-...ng-issues.html


https://www.fitfreak.net/forums/2nd-...hang-5mts.html
Originally Posted by neil patrick harris
dela, from what i've read, it's a function of the ECUs software leaving the throttle open for a little while longer to reduce the amount of unburned particulates expelled after the gas pedal is released.
 
  #40  
Old 09-16-2011 | 04:47 AM
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Originally Posted by 555sexydrive
Mine sees 7000(J's reflash before someone tries to call BS) everyday several times a day when I get an opening in traffic. I still wouldn't call that high revs, but for the rod/stroke the L15A has, it is a decent rev I suppose.
i believe sprint cup racing cars top out at 10,000,7000 sounds good for a street car lol and it has half the cylinders go figure
 


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