b5widebody

Hi guys.
Can anyone help me read this DME report results.
Thanx in advance.
Tomas

groovzilla

630 total hours is low - I'm assuming low mileage car?
1 Over-Rev in Range # 4 & 1 in Range #5 no big deal since it happened 149 hours agoColor 92U the best Arctic Silver

How did the PPI go?

b5widebody

all good thanx, yes 22k miles 1 owner

Petza914

Not quite. There was an overev event at 149.5 hours but the car has 630 hours on it now so that actually happened 480 hours ago. You can also ignore the single overrevs - they're software glitches...so it was a range 2 or maybe kissed range 3 but it was so long ago it doesn't matter.

Average mph is about 35 which is normal if not a bit low - points to more around town driving than highway use.

You're good to go from a DME perspective.

groovzilla

Petza isn't rule of thumb as long as Over-Rev happened at least 50 hours ago, all is good?

b5widebody

Petza, I know the owner, old guy, never tracked never redlined, could all this be just a software glitch like you say?
He states he never redlined the car or even went over 6k.
Sure would be nice to see when it comes out of the factory what the DME says right away.

Petza914

Yep and he's way past that.

Petza914

He probably just missed a shift and caught it right away without full clutch release. It's nothing to worry about in this case and it's impossible to have a single overev in 3 subsequent ranges which is why those are glitches and range 1s and 2s are fine.
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With 123 in range 1 and 10 in range 2, that's a legitimate overev event that went through range one kind of slowly and touched into range 2 for just a bit.

b5widebody

Henrik964

groovzilla

It has also been explained changing a battery on rare occasion cause the over rev blip. Is this correct?

leewillm

Joining on to the dme read assistance. Would you guys mind giving a noob your thoughts on this one? Its a 2008 911 S with 74k miles.

ATX_Native

Totally fine.

Petza914

This engine has been driven fairly hard or regularly on a track. It has seen at least 4 separate overrev events - one at 1,148 hours (range 4), one at 2,091 hours (range 3), one at 2,415 hours (range 2), and most recently at 2,430 hours (Range 1). The total hours on the engine is 2,461 so the last overrev event was only 31 hours ago, but it was also only a Range 1, which isn't concerning and there was a range 2 46 hours ago which is why I say this engine was fairly regularly bumped up against the rev limiter because between the Range 1, 2, and 3 overrevs, there's a total of about 1,900 of them. The way the DME log works is it only captures the hour reading of the most recent one in that range, but to get to 1,900 counts there are multiple instances logged. You can ignore the Range 5s and 6s with a single overrev in each (not possible). Is 1,900 a ton of them - no, there are DMEs of track cars where the counter is maxed out (happens around 15,000 or something like that), but it was spun up more often than I do my own cars. The potential risk is was the engine fully warmed up when these occurred, was the owner keeping up with oil changes so the engine was well-protected during these higher RPM events - that's the stuff only they know.

Do I think this engine may have an issue from what's logged here - No, I don't because the Range 3s and 4s were so long ago.

leewillm

The range 4 was only 2 ignitions. Like the range 5 and 6 shown on the report is that a glitch/error?