over revs question/durametric software

[steve44]

Hi,

I just used the durametric Diagnostic tool to take a look at over revs for my 2002 Boxer S (61,000 miles). The # of ignitions for range 1 is 32485/1255 hours. The # of ignitions range 2 reads out 1/57h operating hours 1758. First, does the 32,458 mean the rev limiter has been activated that many times? That seems extremely excessive. I bought the car in 2006, and rarely (I can remember maybe 1x) push it to 7000 RPM's. Second , does the range 2 # refer to how many times the car went into the red? So, in this case one time only at the 57 hour mark? The Durametric explanation would say one time for 57 hours which does not make any sense to me. Are any of the numbers cause for concern or further service or action on my part?

Thanks for your time, appreciate this forum very much,

Steve

[spongebob]

Hi,

I just used the durametric Diagnostic tool to take a look at over revs for my 2002 Boxer S (61,000 miles). The # of ignitions for range 1 is 32485/1255 hours. The # of ignitions range 2 reads out 1/57h operating hours 1758. First, does the 32,458 mean the rev limiter has been activated that many times? That seems extremely excessive. I bought the car in 2006, and rarely (I can remember maybe 1x) push it to 7000 RPM's. Second , does the range 2 # refer to how many times the car went into the red? So, in this case one time only at the 57 hour mark? The Durametric explanation would say one time for 57 hours which does not make any sense to me. Are any of the numbers cause for concern or further service or action on my part?

Thanks for your time, appreciate this forum very much,

Steve

I guess it is the same as the amount of sparks that has been blocked on the sparkplugs by the rev limiter

32485/6/7200= time on Range 1 meaning that the engine has approx 0.75 minutes at above 7200 rpm.

The range 2 seems to be a long time ago and I should not be worried about this as it is still working

My experience is that it is possible to reach range 2 just by accelerate to hard in first gear and miss the next gear, not only when downshifting in wrong gear.

[steve44]

Hi,

I just used the durametric Diagnostic tool to take a look at over revs for my 2002 Boxer S (61,000 miles). The # of ignitions for range 1 is 32485/1255 hours. The # of ignitions range 2 reads out 1/57h operating hours 1758. First, does the 32,458 mean the rev limiter has been activated that many times? That seems extremely excessive. I bought the car in 2006, and rarely (I can remember maybe 1x) push it to 7000 RPM's. Second , does the range 2 # refer to how many times the car went into the red? So, in this case one time only at the 57 hour mark? The Durametric explanation would say one time for 57 hours which does not make any sense to me. Are any of the numbers cause for concern or further service or action on my part?

Thanks for your time, appreciate this forum very much,

Steve

I guess it is the same as the amount of sparks that has been blocked on the sparkplugs by the rev limiter

32485/6/7200= time on Range 1 meaning that the engine has approx 0.75 minutes at above 7200 rpm.

The range 2 seems to be a long time ago and I should not be worried about this as it is still working

My experience is that it is possible to reach range 2 just by accelerate to hard in first gear and miss the next gear, not only when downshifting in wrong gear.

Thanks Much for the reply. I am going to get in touch with Durametric and see what they have to say...

I will post an update if they come up with anything interesting...

steve

[quinby1]

Hi Steve

I just sprung for a durametric myself (I've had my 05 Boxster for 18 mos). There seems to be a lot of confusion re: over revs and ranges, particularly in the 997/987 cars...since you have a 986 you only have two ranges, 1 & 2...one being kind of ok and two being real naughty. I agree that I wouldn't worry about the single range 2 occurrence as it was long ago. However, here are some interesting observations... You will note that with 1758 hours total your mileage of 61000 is almost perfect (1758x35mph=61,530) and by projection at 1255hrs you last over rev was at about 44,000 miles. However 32,485 seems liked a lot of ignitions....obviously from several occurrences. My understanding is an engine turning 7000 rpm is experiencing 21,000 ignitions per minute (since only three cylinders are igniting)...which would translate to about 350 ignitions per second. If this is right, then 32,485 would be one and a half minutes of time at the rev limiter. Even if we assume that each over rev occurrence accounted for a 1 second over rev (350 ignitions) you would need nearly 100 over revs to hit 32,485. If my figures are wrong, I hope someone out there will let me know as I also get confused re this stuff.

By the way, my 987 shows : range 1 307 / 30hr

range 2 2 / 30hr

range 3 0 / 30hr

range 4 0 / 30hr

range 5 0 / 30hr

range 6 0 / 30hr

total hours 977.8

I interpret this to mean there was one over rev occasion at 30 hours ( about 1000 miles) long before I had car, which accounted for both the 307 ignitions in range one (less than one second) and the 2 ignitions in range 2 ( 1/100 of sec).

:D By the way, I love this durametric, what a great tool...well worth the cost. with new software beta 6.0 version it is amazing...

[steve44]

Thanks much for the reply and your math! I am going to call durametric today and see what they say. If your math is correct (makes total sense) then the owner before me hit the limiter 99 times in 30k miles. Bummer. My Boxter still drives great, I am hopeful this is not a big deal...still...The lesson learned here (imho) is if you are reading this and thinking about buying a Porsche, buy the durametric kit! It is less than $300.00, and even on the version that allows you to work on a max of 5 vin numbers, it allows un limited looks at over rev stats on an un limited number of vehicles. I might have still bought this car, but I also might not have...certainly this informatioin would have given me leverage on price at the least.

I will post after speaking with durametric and also my mechanic.

Steve

[quinby1]

Thanks much for the reply and your math! I am going to call durametric today and see what they say. If your math is correct (makes total sense) then the owner before me hit the limiter 99 times in 30k miles. Bummer. My Boxter still drives great, I am hopeful this is not a big deal...still...The lesson learned here (imho) is if you are reading this and thinking about buying a Porsche, buy the durametric kit! It is less than $300.00, and even on the version that allows you to work on a max of 5 vin numbers, it allows un limited looks at over rev stats on an un limited number of vehicles. I might have still bought this car, but I also might not have...certainly this informatioin would have given me leverage on price at the least.

I will post after speaking with durametric and also my mechanic.

Steve

You're more than welcome Steve....by the way...don't get crazy about this stuff....I've found that most Porsche owners are a little paranoid about their cars..."do you hear that click?"..."what was that rattle?" ..is my ims failing?"....etc....if your car runs well, enjoy it...these are noisy performance machines...the engines tap, click rattle, squeeq, roar, whine, hum and so on...if you listen too hard, you'll hear all kinds of "bad" things and if you look too hard, you'll imagine it's going to explode...just drive and enjoy..quinby1

[Steve Tinker]

I would also be interested to hear what Durametric have to say....

I bought the Durametric last year only to find my 2001 S with 45,000 miles had 23,000 Range #1 ignition overrevs. I nearly dropped the scan tool !!!!

There were NO Range #2 ignitions according to the Durametric.

I had bought the Boxster in 2008 from an official OPC who gave it a clear bill of health, but that didn't prepare me from thinking I had inherited a car previously owned by a rev head moron. But the OPC guys say that if your car has been on a dyno for one reason or another, it only takes a few runs up to redline to get the Range #1 ignitions.

Sounds feasable to me - and as the car did not come with the optional Porsche Crystal Ball, I'm hoping that is what happened...

Keep us informed Steve......