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I have a few overrevs up to level 5. Have no idea how I got them. Not many - in the teens in each level. It's been many hours since then and no problems. I generally do not push it to redline on the track and try shifting around 7k RPM. But, as some mentioned it's the downshifts that get you or maybe mis-shifting. When I drive on the road I will sometimes downshift instead of or before braking, but that is a bad habit to get into if it translates to the track where you generally will want to start braking and then downshift.
Ditto, I also have a few dozen range 5 over revs and they came on an aggressive downshift around 100 hours of use at the track which is now over 400 hours ago so no issues at all. That being said, I always mix 91 and 100 octane at the track to give the car a little more pep and against detention. Car still runs very strong.
Ditto, I also have a few dozen range 5 over revs and they came on an aggressive downshift around 100 hours of use at the track which is now over 400 hours ago so no issues at all. That being said, I always mix 91 and 100 octane at the track to give the car a little more pep and against detention. Car still runs very strong.
I think it is extremely unlikely for this to happen, if at all. The experience I posted earlier in this thread showed me the 9A1 engine rev limiter does a pretty darn good job of preventing redline being exceeded during a missed shift. As the technician explained to me during the PPI for my car when I sold it, Range 1 and 2 ignitions do NOT indicate redline has been exceeded in the 9A1 engine 981 cars, it only indicates the rev limiter has activated. So, Range 1 and 2 "over revs" are not actually redline exceedances. I can't say with certainty that Range 3 ignitions are an indication of redline being exceeded, but Range 1 and 2 do not indicate redline exceedance in 9A1 engines in 981 cars.
What would happen if you planted your foot on the gas to the floor with the gearbox in neutral and starting with the engine at idle? If someone out there in internet land is curious enough to do that and risk their engine, please post video results here. When I missed the 2-3 upshift as I described earlier, the RPM was already in the 6500+ range, and the rev limiter had no problem catching the engine RPM to prevent Range 3 ignitions. I think there were something like 14 ignitions in Range 2 and a couple hundred in Range 1 shown on the VAL report.
I have found that if I miss judge my exit speed and hit the rev limiter, the cars momentum will add a couple of hundred revs before I can react. Having said that I have lots of level 1, a bunch of level 2 and 51 at level 3. The level three are a few hundred hours ago and some of the level 1 were last week. Cayman S with MT.
I recall being at my dealer one day and seeing a yellow GT4 on the lot. I believe it was some kind of a trade in. My SA told me that it had so many over-revs on it that they couldnt CPO it and would most likely have to "wholesale" the car.
Ran into the same thing with my CGTS. I have wondered since then whether whoever purchases that car from the wholesaler is made aware that the remaining warranty doesn’t cover the engine.
I previously had a flawless DME with only Range 1's but over the weekend at Auto Club Speedway, I downshifted a bit early from 4 to 3 and unfortunately got some over-revs to Range 4. I brought the car to the dealership today and had it checked out and also showed them the GoPro footage. They weren't concerned about it and said even on trade-in, the amount of ignitions I have in Range 4 are nothing to stress about. When it comes time to sell my car next year, I'm sure the tire kickers will b*tch n moan about the DME report but I'll price it to sell or just trade it in.
Looking at a GT4 for purchase. DME info
Range 1: 371 ignitions at 48.48 hrs
Range 2: 11 ignitions at 46.71 hrs
Range 3: 15 ignitions at 46.71 hrs
Range 4: 48 ignitions at 46.71 hrs
Range 5: 56 ignitions at 46.71 hrs
Range 6: 0 ignitions
Total hours: 284 hours (7950 miles)
Long enough ago to risk buy-in this? Dealer is offering the extended warranty for 3 years?
Anything I should ask the dealer to do?
Looking at a GT4 for purchase. DME info
Range 1: 371 ignitions at 48.48 hrs
Range 2: 11 ignitions at 46.71 hrs
Range 3: 15 ignitions at 46.71 hrs
Range 4: 48 ignitions at 46.71 hrs
Range 5: 56 ignitions at 46.71 hrs
Range 6: 0 ignitions
Total hours: 284 hours (7950 miles)
Long enough ago to risk buy-in this? Dealer is offering the extended warranty for 3 years?
Anything I should ask the dealer to do?
TIA!
Take the extended warranty, the dealer checked my car out and they said nothing was wrong and would offer an extended warranty if needed.
Looking at a GT4 for purchase. DME info
Range 1: 371 ignitions at 48.48 hrs
Range 2: 11 ignitions at 46.71 hrs
Range 3: 15 ignitions at 46.71 hrs
Range 4: 48 ignitions at 46.71 hrs
Range 5: 56 ignitions at 46.71 hrs
Range 6: 0 ignitions
Total hours: 284 hours (7950 miles)
Long enough ago to risk buy-in this? Dealer is offering the extended warranty for 3 years?
Anything I should ask the dealer to do?
They happened 240 hours ago. That is far beyond the worry-about factor. But if they are offering warranty for free, obviously take it!
You might want to dig into the figures to convince yourself you know what it is. I believe there are 3 ignitions/rev (look it up - I could be wrong), so you can calculate how many revolutions it went at those RPMs. Something like 56 ignitions is 19 revs at 8400 rpm (not sure of the rev levels either), which is 13 milliseconds of wall clock time. So (if my back of envelop is correct) you have 19 revs or 13 ms of time at Level 5 RPM...Levels 4, 3, 2 would be less since num ignitions is less.
The bigger question in my eyes is if the 3 year warranty is from an official Porsche dealership or an aftermarket one. If its the latter, I would read the fine print carefully....
I passed. Never put any money on it. The warranty was a Porsche one and had the exception "X. No benefit is provided for a Pre-existing Condition or a condition which existed prior to the expiration of the manufacturer’s warranty." It was in ALL CAPS in the document.
The car is probably fine but with what I want to do and the $ involved I will keep looking.
I find it interesting that some people are getting DMEs for cars they are interested in purchasing - I was unable to receive one, but was assured that the CPO process would “weed out” any cars that had sketchy over rev issues.
As for the over revs themselves, I saw some discussion further up the thread about whether or not revving out to the fuel cutoff/rev limiter would register as an over rev or not. Has this been determined since that discussion? Also, if it is registering as a range 1 or 2 over rev, surely that isn’t considered an issue, right? - of course responsible driving is necessary (and mechanical sympathy as well) but surely a car like this can handle being taken to the top end of the tach on occasion...
I find it interesting that some people are getting DMEs for cars they are interested in purchasing - I was unable to receive one, but was assured that the CPO process would “weed out” any cars that had sketchy over rev issues.
As for the over revs themselves, I saw some discussion further up the thread about whether or not revving out to the fuel cutoff/rev limiter would register as an over rev or not. Has this been determined since that discussion? Also, if it is registering as a range 1 or 2 over rev, surely that isn’t considered an issue, right? - of course responsible driving is necessary (and mechanical sympathy as well) but surely a car like this can handle being taken to the top end of the tach on occasion...
As you note, the question of rev limiter being reached registering within the first one or two ranges has been stated a number of times.
I have certainly reached the rev limiter on multiple occasions and have the dealer run this report whenever the car is serviced and thus far have received zeros in all ranges.
I would not make a habit out of using your rev-limiter, but it can and does happen. On track I tend to short shift a small amount most of the time... but times that I have had my ear canal blocking speakers in from radios after being in other cars, or beside another car during a passing situation, or trying different lines, it happens. In most situations I do not see any benefit to wringing out the engine for that last couple of RPM and prefer to be easier on the equipment, but it does happen and to date I continue to show zeros in all ranges.
If I were to look at purchasing a car with ranges registered higher than 2, I would probably wait fir the next one, even though may be fine.
As gregmorton notes, redline is 7800, so GT4 over rev ranges are the following;
1: 7800 - 8000
2: 8000 - 8200
3: 8200 - 8400
4: 8400 - 8600
5: 8600 - 8800
6: 8800 or more
The GT4's ECU doesn't add to the numbers when bouncing off the rev limiter, as in not shifting up soon enough, it only adds when an inappropriate downshift drags the revs up into the range.
Hello !
I searched a long time about the exact over revs ranges for the 981 GT4.... and i think your assesement, d00d, is the more realistic one. Do you have this info from a solid source ?
To elaborate, i purchased my 981 GT4 with this report (clean, isn't it ? ):----12.100 km / 335 heures----
Plage 1 / Nombre d'allumages :4 / heure : 120 h
Plage 2 / Nombre d'allumages : 0 / heure :-
Plage 3 / Nombre d'allumages : 0 / heure :-
Plage 4 / Nombre d'allumages : 0 / heure :-
Plage 5 / Nombre d'allumages : 0 / heure :-
Plage 6 / Nombre d'allumages : 0 / heure :-
And i Tracked twice my car at Le Mans Racetrack here in France, and i can garantee that i hit the rev limiter several times !! (I paid 100 % the Price for it so I use 100 % of the 7800 rpm !! ) But i am extremely precotionous with down****s.
I did also logs with Porsche App or Harry's Lap Timer and frequently saw 7700-7800 rpm and even a Maximum of 7825 rpm.
Here is the Report after My 2 Track Events :---- 14.601 km / 391 heures ----
12-29-2018, 08:29 PM
When I missed the 2-3 upshift as I described earlier, the RPM was already in the 6500+ range, and the rev limiter had no problem catching the engine RPM to prevent Range 3 ignitions. I think there were something like 14 ignitions in Range 2 and a couple hundred in Range 1 shown on the VAL report.
