How boned am I?

2772 Views 26 Replies 15 Participants Last post by SunnyvaleCA, 3 mo ago

gotcabinfever

Discussion Starter · 3 mo ago (Edited)

New member here with my recent 2005 Boxster S purchase. I, foolishly, didn't do a PPI and was just playing around with my new Durametric Pro and looked at the Over-Rev report. Car seems to run and drive great for the little bit I have been able to drive it (We are getting almost record snowfall this year). How much sleep should I loose over this?

James
2005 Boxster S

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OttawaSteve

· #2 · 3 mo ago

Engine over Revs

Understanding Porsche rev range activity. A detailed guide from Porsche specialist dealer 911virgin based in Uxbridge, West London

911virgin.com

Reactions: 3

Boristhespyder

· #3 · 3 mo ago

If the car seems to run and drive great, err to that side of your thinking. She's yours now so drive it and enjoy it, don't lose any sleep. Take care of it the way you would now and run it.

Reactions: 5

customyota

· #4 · 3 mo ago

Given that it happened a thousand operating hours ago, I wouldn't think twice about it. If any damage was done, it would have shown up within a few hours of operation. I'm not sure how accurate these measurements are, but I also have a hard time believing that the engine hit range 5 at all given that it only spent 1/3 of a revolution at range 4.

Reactions: 4

gotcabinfever

Discussion Starter · #5 · 3 mo ago

OttawaSteve said:
Engine over Revs

Understanding Porsche rev range activity. A detailed guide from Porsche specialist dealer 911virgin based in Uxbridge, West London

911virgin.com

This was a super helpful article to read. Thanks!

Reactions: 1

deilenberger

· #6 · 3 mo ago

It's around 900 hours since the over-rev occurred (if it occurred) so I wouldn't be concerned. The reason I said "IF" is the page that was referred to:

External Source said:
We are regularly approached to help interpret Rev Range Data. The ability to separate genuine incident from an erroneous recording is critical. In general terms we would consider the registering of less than 10 ignitions within a given range to be no cause for concern. 10 ignitions represents fractions of a second, insufficient time, in our experience to cause damage. Porsche take a different view and consider the registering of a single ignition (one third of an engine revolution) to be relevant. A single ignition recorded in rev range 3 or higher within a 200 operating hour period means that an engine compression test is deemed necessary.

The registering and recording of a single ignition at such high engine speed, in our view, is just not possible in the same way that a single ignition in, for example, Rev Range 4 can’t follow a single ignition in the previous rev range. In order to pass in to a higher bracket of engine speed the engine must complete at least a full engine revolution, a minimum of 3 ignitions.

The Durametric is showing 1 ignition in ranges 4 and 5. I think those are spurious errors for the reasons given above.

Reactions: 3

GT3Twenty10

· #7 · 3 mo ago

That motor is probably in better running shape than a 10k mile garage Queen…. Change the oil regularly and keep ignition parts up to date

Reactions: 4

InigoMontoya

· #8 · 3 mo ago (Edited)

If it drives fine, just count your lucky stars, those overrevs appear when the car was brand new, not broken yet. They seem to appear 5 hours into the life of the car, probably 300 miles or less. I can't believe people do that. Porbably a test drive when new. Salespeople and test drivers don't care and do that. As people said, if it drives fine you are good. Corrected mistake.

Enjoy it now!

Reactions: 2

OttawaSteve

· #9 · 3 mo ago

InigoMontoya said:
If it drives fine, just count your lucky stars, those overrevs appear when the car was brand new, not broken yet. They seem to appear 5 hours into the life of the car, probably 300 miles or less. I can't believe people do that. Porbably a test drive when new. Salespeople and test drivers don't care and do that. As people said, if it drives fine you are good. Enjoy it now!

Not sure I understand that. Which overrevs are you talking about, and how do you read 5 hours in that table?

Reactions: 1

InigoMontoya

· #10 · 3 mo ago

OttawaSteve said:
Not sure I understand that. Which overrevs are you talking about, and how do you read 5 hours in that table?

My mistake I read it backwards. My apologies.

So first overrevs in range 1 happened 5 hours ago from the report time of 3180, NOT at 5 hours.

My sincere apologies.

GT3Twenty10

· #11 · 3 mo ago (Edited)

When an ignition cut would be the best idea for an over rev prevention

Reactions: 1

deilenberger

· #12 · 3 mo ago

Note that ranges 1, 2 and probably 3 are NOT considered over-revs by Porsche. Also from the same source:

External Article said:
The registering and recording of a single ignition at such high engine speed, in our view, is just not possible in the same way that a single ignition in, for example, Rev Range 4 can’t follow a single ignition in the previous rev range. In order to pass in to a higher bracket of engine speed the engine must complete at least a full engine revolution, a minimum of 3 ignitions.

Again making the point that readings of 1 ignition in adjoining ranges is actually impossible. In this case, Range 4 would have to be a minimum of 3 in order for Range 5 to equal 1.

Reactions: 1

GT3Twenty10

· #13 · 3 mo ago

No PPI? They are such a quick easy thing to do. It takes less than the time of an oil change to pull off the sump plate… then you can scope it from the bottom side… sounds like you lucked out… I’m glad for ya

Mike_in OH

· #14 · 3 mo ago

deilenberger said:
It's around 900 hours since the over-rev occurred (if it occurred) so I wouldn't be concerned. The reason I said "IF" is the page that was referred to:

The Durametric is showing 1 ignition in ranges 4 and 5. I think those are spurious errors for the reasons given above.

Had the same odd range 4 & 5 numbers (1) on our 987--likely physically impossible to do. I traded the car with 42K on it and there were no issues ever with it in the 7 years we owned it. The Range 4&5 over revs showed up several thousand hours before we sold it.

Reactions: 1

GT3Twenty10

· #15 · 3 mo ago

Mike_in OH said:
Had the same odd range 4 & 5 numbers (1) on our 987--likely physically impossible to do. I traded the car with 42K on it and there were no issues ever with it in the 7 years we owned it. The Range 4&5 over revs showed up several thousand hours before we sold it.

Those 4-5 ranges never bothered me IF a PPI was done showing the engine is healthy…

Reactions: 1

schwinn

· #16 · 3 mo ago

My car came to me with 51 ignitions in range 6 and 551 in range 5. Both were over 800 hours before I had the car, and the car ran great. These were discovered during the PPI and even the shop said these were not a concern since it was so long ago. You're in basically the same situation - it's old enough that it shouldn't matter, if the car is running fine. My shop, in fact, said they didn't expect to see any overrevs, because it ran so well... they were surprised to see it at all.

I'd say, you're fine... don't worry about it at all. As noted, your 4/5 range ones are likely spurious readings, if anything.

Reactions: 3

foodbiker

· #17 · 3 mo ago

I honestly wouldn't worry about it; odds are your engine is just fine! If you saw a ton of over-revs (especially range 6), then that's a sign that someone beat the hell out of the car at the track -- or really just trashed the car. I think you can sleep really easily here.

Reactions: 2

schell

· #18 · 3 mo ago

I had a car that had 1 over rev in 4-5-6, I later found out that is impossible, if you had real over revs in 4 and 5 the numbers would never be the same, it would look similar to the 1-2-3 numbers with a high number of say 48 in rev rang 5 then 36 in rev rang 4, numbers being exactly the same are impossible.

Maddydaddy

· #19 · 3 mo ago

Thank you all for your knowledge and responses. I feel so much better now!

James

InigoMontoya

· #20 · 3 mo ago

Maddydaddy said:
Thank you all for your knowledge and responses. I feel so much better now!

James

Were here for you!!

Reactions: 2

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