Rev Hang in Manual Transmission

[Emirahep]

Some good info about rev hang in this video:

V interesting - does anyone know whether the Toyota V6 has Direct or Port fuel injection ?

 

[kitkat]

V interesting - does anyone know whether the Toyota V6 has Direct or Port fuel injection ?

Too old to be direct injected the 2GR-FSE added direct injection for twin injection.

 

[Emirahep]

Too old to be direct injected the 2GR-FSE added direct injection for twin injection.

thanks. I think that makes the Rev Hang issue for the Emira “worse” based on the earlier technical video.

 

[Emirahep]

Played with gear changes today in Tour and Sport and confirm no difference - noticeable rev hang in both modes. I couldn’t video myself so will ask a family member to hop in for a ride to try to capture what it looks and sounds like.

 

[Italiabrain]

From what I understand lifting off the throttle immediately causes the fuel mixture to becomes lean -- this increases NOx -- and comes across as an increase in emissions. Slowly reducing the throttle prevents this condition.



Touring and Sport both had it for me, didn't get a chance to try Track -- @Emirahep do you have any input here?

Other side of the curve. Throttle closure / tip-out cause the mix to become rich and increase unburnt or partially burnt hydrocarbon emissions. That's why the solution is to keep the throttle body open artificially long (add air). I agree there was no mode difference on my test drive and I would bet that since it's a regulatory / emissions thing you're not going to see it change meaningfully on drive modes on any modern car.

 

[Emirahep]

Other side of the curve. Throttle closure / tip-out cause the mix to become rich and increase unburnt or partially burnt hydrocarbon emissions. That's why the solution is to keep the throttle body open artificially long (add air). I agree there was no mode difference on my test drive and I would bet that since it's a regulatory / emissions thing you're not going to see it change meaningfully on drive modes on any modern car.

I hear what you say but it is a lot more noticeable/pronounced in the Emira than other modern manual cars that we own or have driven. For example there is slight rev hang in a GR Yaris but it dormant detract from the overall experience. For me, it does “intrude” in the Emira.

 

[Pugwash]

Interesting thread. From my first test drive I noted that the Emira seemed to rev more freely than my Evora and I speculated it had a lighter flywheel which would cause that. However a lighter flywheel would also cause the revs to come down more quickly too which it plainly doesn’t. Wasnt until I read this thread I realised there may be other things going on to cause that effect.

 

[Chobfreak]

I also feel that it only impacts the drive because the flywheel rushes through the rpms, so it feels off if it spins down at a slower rate.

That being said, my GT's racing flywheel drops revs so quickly that a short shifter has become a necessity in order to complete smooth upshifts.

I imagine some people would have a hard time managing the Emira's flywheel, if they aren't used to driving manual cars.

 

[haaaake]

Yeah I really don't understand whey the fuck rev hang is a thing. It just makes the engine feel super unresponsive.