seanmcr6

From my understanding, you should be able to get two numbers for each type. How many ignitions past redline and how long since the last time it happened (in op hours).

For my 04 C4S

Ign 1 3920/2570
Ign 2 3/2024

Total op hour count: 2576

According to Durametric, that means my type one ignitions (hitting the rev limiter) happened mostly when the car was new....sounds like someone was learned to drive a manual xD In the first 6 hours of driving the car they bounced off the rev limiter (roughly) 10 times.

As for the type 2 ignitions...I think 3 is a nice, low number...regardless how long ago it happened =D

LVDell

You have the interpretation of the hours backwards. The DME printout will list the running hour of the last occurrence. So your last Type1 occurred 6 hours ago, not 2570.

seanmcr6

That's impossible. I had owned the car for 2 weeks when I pulled these numbers. Drove it across the country in fact. I never hit the limiter nor missed a shift....

LVDell

Not impossible. That's how the system is setup. It records Type 1 and 2 over-revs as they happen. The hour stamped on the DME reports indicated the time stamp of the last instance.

The 3 recorded for type 2 is more than likely a circuit anomaly so don't worry about it. The Type 1's are really nothing other than hitting the rev limiter which is there to protect the car anyway.

And Type 2's are not just missed shifts. They can also be rev-match over revs during a proper shift with the clutch disengaged at an RPM higher than redline. Again, 3 is nothing and if it even did take place (which is virtually impossible as it is a millisecond). If you give me a second I could get you the actual amount of time it represents. **edit...calculation is .009 seconds**

911SLOW

The information in the thread from the "other" forum is not correct.

I have gathered from PIWIS /Vehicle Analysis Logs data for most 996/997s to evaluate overspeed events here:

https://rennlist.com/forums/8801553-post60.html


As for your second question, the answer is simple. They implemented the rev range categories in the newer DMEs in order to "properly" accept or deny warranty claims and .. to make their life easier accepting cars for their CPO program..

911SLOW

EDIT:

I see that I haven't included the information for the 996C2/C4 there so I will post it now here and update my older post that contains all of them.

There is a newer TI for the VAL:


Technical Information Service 06/09 EN 0335
Apr 9, 2009
Vehicle Analysis Log: Evaluating overspeed events (Boxster 986/Carrera 996) (6/09)

Model year: as of 1997 up to 2004

Vehicle Type:
Boxster (986)/Boxster S (986)
911 Carrera (996)/911 Carrera 4 (996)
Model year 1997 to 2004

Rev ranges - 986 + 996:
Create the VAL before deleting the fault memory. Overspeed events are documented as follows in the VAL:
Rev range 1: 7,200 -1 ... to 7,900 -1
⇒ Maximum permitted engine speed exceeded; engine damage possible.
Rev range 2: over 7,900 -1
⇒ Maximum permitted engine speed exceeded; engine damage probable.

Information
Before starting engine repairs and submitting a warranty claim or granting a pre-owned car warranty:
In the event of overspeed events in range 2, we recommend that you contact the Technical Hotline before starting repairs or granting a pre-owned car warranty in order to find out how to proceed and agree on warranty entitlements.

References:
→ “After Sales News 11/2007” and “Porsche Aktuell”: PIWIS Tester: Function for returning Vehicle Analysis Logs (VALs)

seanmcr6

The type 2 number doesn't bother me because it happened before I bought it...but the type 1 number would indication I bounced off the rev limiter 6 hours ago. I pulled these numbers right after driving across Canada....for 2 days....using cruise control. The time indicated, as you describe it, would be squarely on a long, straight and empty piece of road. The last 4 hour leg up to my town. I know for a fact I didn't hit the limiter. It was roughly 4 in the morning...I didn't even have to pass anything. It was the most boring part of the trip actually.

I think you've got it backwards...

LVDell

I'm not going to argue with you. Call the dealer and verify. That's where I got my info from.

p.s. check out this video from the Durametric website to help you understand it. LINK

DIRECT QUOTE FROM THE VIDEO: "...and second, the total number of operating hours of the car the last time the engine entered that range"

Unsubscribing.