I was searching on the web if there was anyway of getting a 6th gear into our trans. The reason for this is my 2011 manual sport fit makes 40mpgs around 65mph which is about 3300rpm. I then looked up when does vtec cross over. I have seen around 3500rpm some say between 3 to 4k. My mpgs drop a lot at 72 to 80mph which is anywhere between 3500 to 3800ish rpms. So I started thinking maybe my mpgs are droping because the vtec crossover is to low. If I could up it to say 4k I believe it would help a lot for my mpgs. Maybe the gearing is not the problem at that speed. Hell my awd talon was at 3900rpm at 80mph and I was almost getting 30mpgs. I wish hondata made products for our cars. What do you all think gearing or vtec killing mpgs at 80mph?

 

The relatively bad aerodynamics of the Fit and lack of torque are more to blame for the fuel mileage decrease at higher speeds than the high cruising RPM.

The 6MT JDM Jazz has similar gearing, just with an extra gear.

iVTEC is engaged at 5500RPM IIRC according to people who have hooked up a light to the VTEC solenoid. There is not much of a "crossover" like on old VTEC motors (at least that is dramatically visible on a dyno)

I recently rented a new Corolla AT that has long gears and cruised at a much lower RPM than the Fit, driving economically I was able to get ~36mpg. Honda knew what they were doing with the Fit's gearing even though everyone complains about the buzzy nature, I can get 40+ easy even with the buzzbomb MT Fit.

 

5200 :-0 crossover?! Wow what is the point of it being so high when the motor doesnt have much left in it after that. I could see it being so high if we could rev it out to 8k.

 

Here check this thread:

https://www.fitfreak.net/forums/2nd-...ec-engage.html

I'm sure the high cam is set high in RPM for fuel efficiency reasons. The powerband is very linear on the L15A7, it's not like the old VTEC motors where VTEC JUST KICKED IN YO!!!!!!!!1!!1 kick in the pants. High cam is there to get the most out of the SOHC at high RPM where economy doesn't matter and the low cam will start falling off.

 

Well then that answers that. Hahahah thanks

 

The vtec engages right around 5,300rpm on my 2012 Sport A/T. The reason I know is because I can hear it through the DIY intake I put on. It's a very abrupt and noticable difference in sound when it crosses over. I would agree that the crossover is just to keep the engine running smoothly throughout the rpm range though because, other than the louder sound it makes, it doesn't give a noticable kick in power when it crosses over. It just sounds different/louder.

-Dustin

 

Hahah my last honda was an eg b18c1 turboed hatch. I could hear the vtec in that this car is quite like a mouse hahah. People say its loud on the highway to me its a Cadillac.