8th Generation Honda Civic Forum - View Single Post

07 Figi Blue Si · 08-16-2007, 09:54 PM

I think they did it for a better 0-60 and quarter times. When you take this car to redline at 8K and shift, with the rev hang issue, and the manual tranny issue of having to shift rather slow to not grind (due to fluid binding), has anyone ever noticed that the rpm falls right back to around 6K at the clutch disengagment point of the next gear??? And the V-TEC starts at 5.8K??? See any connection here?????? I sure do.

It allowed the car to stay in the "vtec power band" for all subsequent shifts. Now a Hondata reflash would solve this, lowering the vtec point, but as stock I believe it is an engineered performance enhancement to keep you fat in the power band. Any comments? Any takers??

I haven't read anything on this subject to this effect, but that is my observation, and unless I do a Hondata reflash, I kinda like the rev hang less being abnormal to typical manual shifting cars.

Now don't get me wrong. I do not believe that the engine designers at HMC knew this would happen, but after coupling such a light flywheel and seeing that at 8K this light spinning mass had no inertia to then slow it back down (ie: this is the real reason the revs hang-Honda Fits and I'm told some RX8s suffer from this as well), Honda engineers took advantage of it in the ECU programming to make it hang electronically longer that it actually does mechanically. That is why they can't completely eliminate it, becauser the mechanic side of this coin is a fixed variable, but rather they just improve it, by simply removing the code in the ECU that was designed to "let it hang-fat" for the next shift. That's what I think, and why I like rev hang.

This would be a very good test. Any of you that have had the rev hang reflashed should race one of you that hasn't. My bet would be on the stock rev hanger, who would probably get 1/10s from 0-60, and maybe 2-3/10s in the quarter. Someone please confirm or deny this theory, or anyone in N. CA whose dealer reflashed their car care to race to check this out? Preferrably some one with an Injen SRI, and no other mods like myself. That would be apples to apples.

08-16-2007, 09:54 PM	#273 (permalink)
07 Figi Blue Si Senior Member Join Date: Jul 2007 Location: N. Ca Posts: 199 Lance	Why they engineered "Rev Hang" I think they did it for a better 0-60 and quarter times. When you take this car to redline at 8K and shift, with the rev hang issue, and the manual tranny issue of having to shift rather slow to not grind (due to fluid binding), has anyone ever noticed that the rpm falls right back to around 6K at the clutch disengagment point of the next gear??? And the V-TEC starts at 5.8K??? See any connection here?????? I sure do. It allowed the car to stay in the "vtec power band" for all subsequent shifts. Now a Hondata reflash would solve this, lowering the vtec point, but as stock I believe it is an engineered performance enhancement to keep you fat in the power band. Any comments? Any takers?? I haven't read anything on this subject to this effect, but that is my observation, and unless I do a Hondata reflash, I kinda like the rev hang less being abnormal to typical manual shifting cars. Now don't get me wrong. I do not believe that the engine designers at HMC knew this would happen, but after coupling such a light flywheel and seeing that at 8K this light spinning mass had no inertia to then slow it back down (ie: this is the real reason the revs hang-Honda Fits and I'm told some RX8s suffer from this as well), Honda engineers took advantage of it in the ECU programming to make it hang electronically longer that it actually does mechanically. That is why they can't completely eliminate it, becauser the mechanic side of this coin is a fixed variable, but rather they just improve it, by simply removing the code in the ECU that was designed to "let it hang-fat" for the next shift. That's what I think, and why I like rev hang. This would be a very good test. Any of you that have had the rev hang reflashed should race one of you that hasn't. My bet would be on the stock rev hanger, who would probably get 1/10s from 0-60, and maybe 2-3/10s in the quarter. Someone please confirm or deny this theory, or anyone in N. CA whose dealer reflashed their car care to race to check this out? Preferrably some one with an Injen SRI, and no other mods like myself. That would be apples to apples.