[MLJJ]

This is totally premature since I don't currently have a car in the garage but I've been confused for a while about red line infractions, or not. Some posts suggest that over-revving can be diagnosed via onboard logging records (in various stages of excess) and others indicate that is not the case. As I understand, the 718 has a fuel cutoff function to prevent red line excesses. Has anyone experienced the cut off? The only reason I ask is that I'm sure I will paddle the wrong way eventually and downshift when I wanted to upshift! My apologizes for this naive question as I've never had to worry about such things in the past.

 

[trusted]

The over rev issue only applies to manual transmission cars. The PDK will not allow you to downshift into the wrong gear. Hitting the rev limiter on acceleration is not an issue. It happens.

 

[MLJJ]

Idiot proof, excellent. I think I'll stop asking questions until I know more... Thanks

 

[Grozk17]

The fuel shut off is quite abrupt at redline. If you don’t anticipate the 1-2 shift (or others for that matter) and get to redline-the anchor drops- boom-immediate power cut. Happened once during a brisk run up after break in. The only way you could exceed redline is on a “money shift” error (l.e. 5th-2nd, rather than 5th-4th at a speed that exceeds the max at the lower gear).

 

[CaymanMatt]

I presume the rev matching function will not over rev on a missed shift. Ie: the over rev will only occur if you actually lift off the clutch after the missed shift. Correct?

 

[CaymanMatt]

I presume the rev matching function will not over rev on a missed shift. Ie: the over rev will only occur if you actually lift off the clutch after the missed shift. Correct?

Does anyone have any knowledge on this item? If the question is unclear let me know.

 

[Calimerus]

I presume the rev matching function will not over rev on a missed shift. Ie: the over rev will only occur if you actually lift off the clutch after the missed shift. Correct?

It will rev, but It doesn't matter

If you do a bad miss shift, there's no Saint in Heaven that can prevent your valves to get damaged

It isn't about rev matching..

 

[CaymanMatt]

I presume the rev matching function will not over rev on a missed shift. Ie: the over rev will only occur if you actually lift off the clutch after the missed shift. Correct?

It will rev, but It doesn't matter

If you do a bad miss shift, there's no Saint in Heaven that can prevent your valves to get damaged

It isn't about rev matching..

The question was "will the rev matching feature match beyond the red line?" I would hope not. Why is this important? Because, for example, if I'm at or near the redline and miss the 5-6 upshift, ending up in 4th, if rev matching tries to meet the demand it'll be good bye engine. However if it doesn't match beyond the redline I should know before I release the clutch that I'm in the wrong gear and will not do that. It's already happened to me as I get acclimated to a 6 speed. It happened though at much lower break-in revs so rev matching never came close to the red line. The same would apply to a missed downshift from 6-3, etc instead of 6-5, etc.
Does this clarify the question?

 

[JazzCatGab]

The question was "will the rev matching feature match beyond the red line?" I would hope not. Why is this important? Because, for example, if I'm at or near the redline and miss the 5-6 upshift, ending up in 4th, if rev matching tries to meet the demand it'll be good bye engine. However if it doesn't match beyond the redline I should know before I release the clutch that I'm in the wrong gear and will not do that. It's already happened to me as I get acclimated to a 6 speed. It happened though at much lower break-in revs so rev matching never came close to the red line. The same would apply to a missed downshift from 6-3, etc instead of 6-5, etc.
Does this clarify the question?

This is happening to me as I, too, get more experience driving my car. Apparently twisty Kentucky roads aren't quite twisty enough because I find most of my downshifts are to 5th gear from 6th and then back up again after powering through the turn. As soon as I hear it trying to match 4th, I pull out of that sucker, assisted by that "Oh ****!!" adrenaline rush! I'm sure it could happen at other changes, but for me, it is remembering not to just pull it back from 5th. It is happening less and less, but still ...

 

[Calimerus]

The question was "will the rev matching feature match beyond the red line?" I would hope not. Why is this important? Because, for example, if I'm at or near the redline and miss the 5-6 upshift, ending up in 4th, if rev matching tries to meet the demand it'll be good bye engine. However if it doesn't match beyond the redline I should know before I release the clutch that I'm in the wrong gear and will not do that. It's already happened to me as I get acclimated to a 6 speed. It happened though at much lower break-in revs so rev matching never came close to the red line. The same would apply to a missed downshift from 6-3, etc instead of 6-5, etc.
Does this clarify the question?

Since the rev mach is nothing more than a blip on the gas, I suppose that the answer is no.

 

[CaymanMatt]

The question was "will the rev matching feature match beyond the red line?" I would hope not. Why is this important? Because, for example, if I'm at or near the redline and miss the 5-6 upshift, ending up in 4th, if rev matching tries to meet the demand it'll be good bye engine. However if it doesn't match beyond the redline I should know before I release the clutch that I'm in the wrong gear and will not do that. It's already happened to me as I get acclimated to a 6 speed. It happened though at much lower break-in revs so rev matching never came close to the red line. The same would apply to a missed downshift from 6-3, etc instead of 6-5, etc.
Does this clarify the question?

Since the rev mach is nothing more than a blip on the gas, I suppose that the answer is no.

I don't think that's correct. It's a rev match. If I'm in 5th at 6300rpm and I slip to 4th instead of 6th, it will try to match the need for 4th, which could be 8000 rpm. I hope it is smart enough to not do that but that is the source of my question.

 

[CaymanMatt]

The question was "will the rev matching feature match beyond the red line?" I would hope not. Why is this important? Because, for example, if I'm at or near the redline and miss the 5-6 upshift, ending up in 4th, if rev matching tries to meet the demand it'll be good bye engine. However if it doesn't match beyond the redline I should know before I release the clutch that I'm in the wrong gear and will not do that. It's already happened to me as I get acclimated to a 6 speed. It happened though at much lower break-in revs so rev matching never came close to the red line. The same would apply to a missed downshift from 6-3, etc instead of 6-5, etc.
Does this clarify the question?

This is happening to me as I, too, get more experience driving my car. Apparently twisty Kentucky roads aren't quite twisty enough because I find most of my downshifts are to 5th gear from 6th and then back up again after powering through the turn. As soon as I hear it trying to match 4th, I pull out of that sucker, assisted by that "Oh ****!!" adrenaline rush! I'm sure it could happen at other changes, but for me, it is remembering not to just pull it back from 5th. It is happening less and less, but still ...

Exactly, particularly the "Oh ****!!" part!

 

[Calimerus]

I don't think that's correct. It's a rev match. If I'm in 5th at 6300rpm and I slip to 4th instead of 6th, it will try to match the need for 4th, which could be 8000 rpm. I hope it is smart enough to not do that but that is the source of my question.

Now I understand what you mean... I strongly believe that Porsche engineers haven't been so stupid to make possible to override the cutoff limit.

 

[phroenips]

Now I understand what you mean... I strongly believe that Porsche engineers haven't been so stupid to make possible to override the cutoff limit.

I'd be inclined to agree with this. The problem with the over-rev is if you release the clutch, and the transmission is then physically forcing the engine to spin faster than the redline. No software can prevent that.

 

[CaymanMatt]

Now I understand what you mean... I strongly believe that Porsche engineers haven't been so stupid to make possible to override the cutoff limit.

I'd be inclined to agree with this. The problem with the over-rev is if you release the clutch, and the transmission is then physically forcing the engine to spin faster than the redline. No software can prevent that.

That I understand. It's a mechanical linkage.

 

[Calimerus]

I'd be inclined to agree with this. The problem with the over-rev is if you release the clutch, and the transmission is then physically forcing the engine to spin faster than the redline. No software can prevent that.

Of course, it's what I've already written. Once you miss shift, no Saint can save you from the disaster.

What @CaymanMatt want's to know is: what happens if you "start" a miss shift, but you don't engage at the end the wrong gear, but just "try to".

 

[CaymanMatt]

I'd be inclined to agree with this. The problem with the over-rev is if you release the clutch, and the transmission is then physically forcing the engine to spin faster than the redline. No software can prevent that.

Of course, it's what I've already written. Once you miss shift, no Saint can save you from the disaster.

What @CaymanMatt want's to know is: what happens if you "start" a miss shift, but you don't engage at the end the wrong gear, but just "try to".

Once again, exactly!

 

[717R]

Now I understand what you mean... I strongly believe that Porsche engineers haven't been so stupid to make possible to override the cutoff limit.

I'd be inclined to agree with this. The problem with the over-rev is if you release the clutch, and the transmission is then physically forcing the engine to spin faster than the redline. No software can prevent that.

That I understand. It's a mechanical linkage.

I take it that this applies only to Manual? That excessive down paddle shifts in PDK (example 6 to 2) will not mechanically force the engine to over rev and cause damage? That there’s some fuel cutoff or some other override to prevent this from happening.

 

[Calimerus]

I take it that this applies only to Manual? That excessive down paddle shifts in PDK (example 6 to 2) will not mechanically force the engine to over rev and cause damage? That there’s some fuel cutoff or some other override to prevent this from happening.

We are talking about manual rev match.


You can't miss shift with the PDK, it allows you to put only the right gears

 

[717R]

?? Thanks