Synchro upshifts too?

[jenksdrummer]

Curious thing I noticed driving home today.

Seems the 2019 seems to do upshift matching as well. Maybe this is true for mustangs prior(?)

Last manual I had was a '97 Ranger...I've attributed my crappy shifting skills to being out of practice...but maybe not...

What I noticed is that it'll drop the RPM to the align with the next gear you shift to and hold it in sync for about 2 seconds before dropping the engine down to idle - OR - if you touch the gas pedal that will override it...in my case, I was hearing the engine match up, but, not knowing the ECU was doing the work, I'd give it some gas to the next gear, causing it to drop off RPM as I'm not giving it enough throttle (or too much because I'm working against the ECU in terms of feedback) - resulting in a jerky shift...

Anyhow - as some (mainly me) have commented about feeling like a kid with a learner's permit; this might be why.

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[HeelToeHero]

Upshift rev match has been on all s550s

 

[Angry50]

yes this has been in place since 2015. i think its been referred to as rev hang. i never liked it.

 

[Intrepid175]

The car isn't rev matching on an upshift. If the system would simply let the engine drop normally when you let off the throttle during an upshift, you could catch it at the appropriate engine rpms when you shift. Unfortunately, the system doesn't let the engine rpms drop right away. From what I've read, it has something to do with pollution emissions. I agree with Angry50, it's a total PITA and makes it much more difficult to do a smooth upshift than it should be, although I've learned to feather the clutch a bit while releasing such that it's not that bad most of the time, but there are still moments.

 

[HeelToeHero]

The car isn't rev matching on an upshift. If the system would simply let the engine drop normally when you let off the throttle during an upshift, you could catch it at the appropriate engine rpms when you shift. Unfortunately, the system doesn't let the engine rpms drop right away. From what I've read, it has something to do with pollution emissions. I agree with Angry50, it's a total PITA and makes it much more difficult to do a smooth upshift than it should be, although I've learned to feather the clutch a bit while releasing such that it's not that bad most of the time, but there are still moments.

Actually that's not it at all. My revs do not hang. They drop to the RPM required for the next gear. See 11:08 in the video here:

 

[IronG]

Actually that's not it at all. My revs do not hang. They drop to the RPM required for the next gear. See 11:08 in the video here:

Really liked your video, informative and the relaxed style is nice. I am surprised that they put in such a strong spring in the clutch, not really sure what type of driver they are trying to help by using it. Congrats on getting a great deal on a fun from the factory car (minus the spring apparently). Will be interested to hear how your mods go. Thanks for sharing.

 

[HeelToeHero]

@IronG - just to clarify: that's not my video

 

[IronG]

@IronG - just to clarify: that's not my video

Ah ok. Thanks for posting it.

 

[Wolverine]

To more accurately define this term, when we say “Rev Hang” it does not mean that the revs stay right where they were the moment you push the clutch pedal to perform a shift....instead, the revs drop to a CALCULATED rpm which the car expects to be at when the immediate next higher gear is engaged and the clutch let out, assuming little to no drop in MPH if the driver can shift in a timely fashion.

For example: if you’re cruising along in 3rd gear at 3,000 rpm at 50mph (arbitrary values for example only), and you depress the clutch to make an upshift, the revs will NOT stay at 3,000. They will drop to, say, 2,500 rpm to be ready for clutch disengagement in 4th gear, at the same 50mph you started at.

This is a huge problem for me because every day during my commute I skip-shift, moving from first gear directly to third, and then over to fifth. Or also second to fourth to sixth. Heck occasionally first to fourth. Doesn’t matter, the point is....this rev hang “feature” is one of my most hated things about the car. It rev hangs for the next gear every time and it annoys the bejeezus outta me. I’ve been looking for a solution (within a tune most likely) since owning the car.

I’ve heard only one mention, that HP Tuners can remove this “feature”, but its only a rumor. I’d love to figure it out once and for all.

 

[HeelToeHero]

@Wolverine yes of course for skip shift it wouldn't work.

 

[w3rkn]

The throttle should do what it is told, not what it thinks it should do.....

Who rows through their gears sequentially..? I don't know anybody who does.

 

[HeelToeHero]

I do...a lot of gm folks must as well since they disable the skip shift lockout...

 

[jenksdrummer]

I'm not sure if I like it or not, but knowing it's doing it and adjusting for it, I've managed to smooth out my shifting significantly for daily-driving.

But, that's now, with 300 on the odometer after not having had a manual transmission for 8 years. As I get more into the car and what it can do, I may find it more annoying...

To that, I do fine 1st gear is a bit on the short side with 3.73 rear, and 6th is too short too at least at the 75-85 people tend to drive stupid around here with...lol

 

[NoVaGT]

Upshift rev match has been on all s550s

Huh?

 

[Wolverine]

I do...a lot of gm folks must as well since they disable the skip shift lockout...

The GM folks who disable that lockout don’t do it because they shift sequentially 100% of the time, they disable it because they want control of their car. Period.

The car already allows sequential shifts if driven to parameters GM considers “sporting” but who the heck wants to worry about how close you are to that threshold?? And risk looking like a fool if you take a friend/family member for a ride and “miss” a shift because you weren’t high enough in the revs to ‘unlock’ the next gear. Not to mention the safety factor..

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