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Does anyone know what RPM triggers an over rev report in a GT4? And does anyone know if there is a rev limiter below over rev 1?
I basically like shifting at redline in everything I drive hard and am wondering if there is any risk of generating an over rev report doing so. (i've searched but could only find older cars which range from 200rpm over redline to 600rpm (997 GT3) over for triggering a overrev 1 report)
Totally agree with @JCviggen , I’m always short shifting as I pass 7000, but it just wants to get to 8000. Pulls all the way through the revs
I'm on the side of "just enjoy it". The engine doesn't mind. In fact I was so annoyed by the rev limit at 8000 that I had it moved up to 8300. Screw the over-rev counter. I want to enjoy the engine.
17955325[/url]]Does anyone know what RPM triggers an over rev report in a GT4? And does anyone know if there is a rev limiter below over rev 1?
I basically like shifting at redline in everything I drive hard and am wondering if there is any risk of generating an over rev report doing so. (i've searched but could only find older cars which range from 200rpm over redline to 600rpm (997 GT3) over for triggering a overrev 1 report)
If you’re shifting at redline you’ll inevitably produce over rev events.
Max horsepower and torque are well below redline. Unless you’re trying to win a race, why go to redline?
Max horsepower and torque are well below redline. Unless you’re trying to win a race, why go to redline?
No, max power on a stock car is pretty much where the limiter is. That's why it's so easy to hit in the 4.0 cars, they kinda "feel" like they would want to go further.
You will get stage 1 over revs from hitting the limiter, but pretty much all cars will have those including PDK equipped ones. Stage 1-2 nobody cares about, including Porsche for warranty etc so it doesn't really matter.
Interested to know more after my 5th-2nd gear money shift a few weeks ago. Only revved to about 8500RPM so it wasn't massive but it was probably enough to trigger a report.
Totally agree with @JCviggen , I’m always short shifting as I pass 7000, but it just wants to get to 8000. Pulls all the way through the revs.
Hey @Reedy , we’re you on a slight incline going downhill? Had 1 of those coming out of turn 14 at Road America. Was trying to setup a pass. Dropped into 2nd, WOT, and holy crap; that tac flew past 7000. When I later looked at the throttle trace, could clearly see the ECU cut throttle around 7850. Looked like momentum carried it just a whisker under 8000 before I up shifted. Your probably ok.
Totally agree with @JCviggen , I’m always short shifting as I pass 7000, but it just wants to get to 8000. Pulls all the way through the revs
I'm on the side of "just enjoy it". The engine doesn't mind. In fact I was so annoyed by the rev limit at 8000 that I had it moved up to 8300. Screw the over-rev counter. I want to enjoy the engine.
I've never overreved my GT4. But it sure is an easy car to hit the fuel cutoff on. The rev limiter fuel cut is very abrupt and right at 8000 rpm, just when the car is making peaking power. There is no safe overrev range after the indicated redline. And sometimes I feel like the rev limiter fuel cut is kicking in at 7800 or 7900 rpm indicated on the tach, even when the car is fully warmed up. I've often wondered if I got a GT4 with the GTS 4.0 engine tune...
Every other manual car I've ever owned have a grace RPM range after the redline indicated on the tach where fuel cut does not intervene until a few hundred RPM later - Even cars that have a redline significantly higher than the GT4..
My understanding is that hitting the rev limiter is only a range 1 or maybe range 2 "overrev" in the ECU, which are both considered normal/not problematic by Porsche.
Based on my experience back in my earlier 911 days, hitting redline will normally record range 1 overrev counts. It's not unusual, maybe even typical, to find manual or even PDK cars with some range 1 counts and that typically isn't a big concern.
I know that people looking at overrevs also tend to look at the timestamp on them. So old low-range (range 1 and 2) overrevs are not as big a deal as recent ones - like someone trying to move a car after a known high-range overrev event. If the car has a lot of hours after a significant overrev, then it is less likely to have broken something.
Almost all cars that have been driven hard show some range 1 overrev counts.
I'm on the side of "just enjoy it". The engine doesn't mind. In fact I was so annoyed by the rev limit at 8000 that I had it moved up to 8300. Screw the over-rev counter. I want to enjoy the engine.
You are without question, the best at taking these to the limit and back. Two thumbs up sir.
Based on my experience back in my earlier 911 days, hitting redline will normally record range 1 overrev counts. It's not unusual, maybe even typical, to find manual or even PDK cars with some range 1 counts and that typically isn't a big concern.
I know that people looking at overrevs also tend to look at the timestamp on them. So old low-range (range 1 and 2) overrevs are not as big a deal as recent ones - like someone trying to move a car after a known high-range overrev event. If the car has a lot of hours after a significant overrev, then it is less likely to have broken something.
Almost all cars that have been driven hard show some range 1 overrev counts.
It is my understanding that an over rev is only reported on a "downshift", when the rev limit is breeched.
That's not the way the Porsche ECU records them. Just pinging off the revlimiter counts as 1 range 1 or range 2 overrev in the overrev recorder, even thought that's not what most people would consider an "overrev." When a Porsche technician is evaluating a car, it's my understanding that recorded range 1 overrevs are fine. And a few range 2 overervs are probably fine too.
As I understand it, you would need to mechanically overrev the engine by moneyshifting it to get a range 3 or higher overrev recorded by the ECU. Range 3 overrevs and anything over that is considered potentially concerning on the car, especially if the overrevs were recorded recently.
That's not the way the Porsche ECU records them. Just pinging off the revlimiter counts as 1 range 1 or range 2 overrev in the overrev recorder, even thought that's not what most people would consider an "overrev." When a Porsche technician is evaluating a car, it's my understanding that recorded range 1 overrevs are fine. And a few range 2 overervs are probably fine too.
As I understand it, you would need to mechanically overrev the engine by moneyshifting it to get a range 3 or higher overrev recorded by the ECU. Range 3 overrevs and anything over that is considered potentially concerning on the car, especially if the overrevs were recorded recently.
I bounced the limiter on two separate occasions, and they didn't show on my report...wonder why the difference/discrepancy/change?
When I sold my 981 GT4 it had over 900 revs range 1. Zero rev range 2 or higher. I never missed a shift and hit the limiter maybe 5 times. So based on that I think revving these cars to or near redline will be recorded. That's what rev range 1 is.
02-06-2022, 02:03 AM
Over rev report trigger?
