Strange over rev report on GT4
12-20-2018, 04:22 PM
#16
Drifting
This car very well may have been traded/sold only because of what happened 2hrs ago.
Would be interesting to know how the ownership has changed over the last 5hrs of driving.
Would be interesting to know how the ownership has changed over the last 5hrs of driving.
12-20-2018, 04:27 PM
#17
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Those ranges look reasonable for the 981 engines, but I can't say with certainty they are 100% accurate.
FWIW, I have Range 2 over revs in my PDK equipped Boxster S that I have owned since brand new, and I was not surprised when the dealer tech that did the VAL report at about 25k miles told me there was nothing to be concerned about. In fact, he told me based on his experience over many years, he sees fewer engine problems on Porsches that have hit the rev limiter than those that have zero ignitions in Range 1. IOW, if the engine is dogged around and not revved up near redline frequently, you aren't using it like it was designed to be used. BUT, always fully warm up your engine and its oil before you push the revs up high. I personally keep mine below 3,000 RPM until the engine oil has hit 160F, and don't push beyond that towards redline until the engine oil is above 195F.
12-20-2018, 04:32 PM
#18
Rennlist Member
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.
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.
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ZG911 (07-14-2020)
12-20-2018, 04:38 PM
#20
Rennlist Member
Porsche reportedly refuses warranty claims for any range 3 and above, unless it’s been 50 (1), 100 (2) or 200 hours (3) since, not sure which number is accurate.
It cumulatively records revs in each range, but can only record one date, which is when the last one occurred.
1: https://rennlist.com/forums/991-gt3-...l#post15232996
2: https://rennlist.com/forums/porsche-...l#post15230929
3: http://www.911virgin.com/porsche/rev-range-information/
It cumulatively records revs in each range, but can only record one date, which is when the last one occurred.
1: https://rennlist.com/forums/991-gt3-...l#post15232996
2: https://rennlist.com/forums/porsche-...l#post15230929
3: http://www.911virgin.com/porsche/rev-range-information/
12-20-2018, 04:41 PM
#21
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Originally Posted by d00d
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.
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.
12-20-2018, 04:45 PM
#22
Rennlist Member
12-20-2018, 04:46 PM
#23
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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.
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.
12-20-2018, 07:02 PM
#26
Burning Brakes
Money shifts are always something to worry about as a rev limiter certainly doesn't work to cover that. The defined over rev ranges are for what I would consider things that can only happen with a horribly timed downshift. Spin one hard by letting the rear tires drive the engine and you are asking for bad things to happen.
12-20-2018, 09:10 PM
#27
Rennlist Member
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.
12-21-2018, 09:16 AM
#28
Rennlist Member
This might be an interesting data point for reference even though there may be some differences in the ranges between GT4 and GTS. Do you have any estimation how you created so many Level 1's? Did you frequently rev to X,XXX RPM? Or did you frequently bang on the rev limiter which typically showed as X,XXX rpm?
12-21-2018, 10:40 AM
#29
Rennlist Member
It’s showing the number of ignition cycles in the various over speed ranges. Ignitions recorded above range 2 are a red flag. This car has some in range 5, and it happened about 2 hours of run time ago, so maybe less than 100 miles since the incident. Personally I would walk away on this car. It is still under primary warranty, but you should expect that warranty to be void if you were to take it in for an engine related issue. You can certainly read this from between the lines of them being unwilling to do a CPO. The only way o would buy this car is if you could get the dealer to put in writing that they will cover the engine for you if there’s trouble... I’m guessing they won’t go out on that limb.
12-21-2018, 11:28 AM
#30
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.