Engine Revolutions Range Report

[hopeforcash]

Hi, I hope to be a owner of a 2003 996 C4 Cab and have a copy of the Porsche Report from the vendor when he purchased it last year. Can anyone explain what the Engine Revolutions Range Report is?

I have

Ignition Hours

Range Number 1 2334 926.4

Range Number 2 1 152.5

Are these good numbers? What do they mean?

Thanks

Edited March 12, 2010 by hopeforcash

[quinby1]

Hi, I hope to be a owner of a 2003 996 C4 Cab and have a copy of the Porsche Report from the vendor when he purchased it last year. Can anyone explain what the Engine Revolutions Range Report is?

I have

Ignition Hours

Range Number 1 2334 926.4

Range Number 2 1 152.5

Are these good numbers? What do they mean?

Thanks

Ok, here goes....The DME records and keeps a record of the times your engine has hit the rev limiter, as well as at what hour of operation the "over-rev" occurred. On the 996 there are two ranges, 1 &2. Range 1 records the number of ignitions at the rev limiter, in this case a total of 2234 ignitions, the last one happening at 926.4 hours of operation (I would guess somewhere around 32000 miles). It also shows 1 ignition at range 2 at 152.5 hours of operation or perhaps 5000 miles. You arrive at these Guestimates by multiplying hours of operation by an average 35mph. Anyhow, were not done with the fancy math just yet. Now these are the actual number of ignitions recorded by the engine, so if at 7200 rmps the engine is firing 21,600 ignitions per minute or 360 ignitions per second, that means the engine spent about 6 and 1/2 seconds at the rev limiter. How many occasions this represents is a real guess, but more than one and less than six? Totally confused yet? what you really want to know is that it's no big deal. Now the single over rev in range two is supposed to be a bad thing, I think in this case it is an anomaly, and since it occurred so long ago, it doesn't matter.

By the way, that printout should give you the total hours of operation...if you multiply that number by 30 to 35 it should give you the approximate mileage on the car. Just a way to check on the actual mileage.

Well that's really more than you want to know, if the car is otherwise good, go for it....B)

[hopeforcash]

Hi, I hope to be a owner of a 2003 996 C4 Cab and have a copy of the Porsche Report from the vendor when he purchased it last year. Can anyone explain what the Engine Revolutions Range Report is?

I have

Ignition Hours

Range Number 1 2334 926.4

Range Number 2 1 152.5

Are these good numbers? What do they mean?

Thanks

Ok, here goes....The DME records and keeps a record of the times your engine has hit the rev limiter, as well as at what hour of operation the "over-rev" occurred. On the 996 there are two ranges, 1 &2. Range 1 records the number of ignitions at the rev limiter, in this case a total of 2234 ignitions, the last one happening at 926.4 hours of operation (I would guess somewhere around 32000 miles). It also shows 1 ignition at range 2 at 152.5 hours of operation or perhaps 5000 miles. You arrive at these Guestimates by multiplying hours of operation by an average 35mph. Anyhow, were not done with the fancy math just yet. Now these are the actual number of ignitions recorded by the engine, so if at 7200 rmps the engine is firing 21,600 ignitions per minute or 360 ignitions per second, that means the engine spent about 6 and 1/2 seconds at the rev limiter. How many occasions this represents is a real guess, but more than one and less than six? Totally confused yet? what you really want to know is that it's no big deal. Now the single over rev in range two is supposed to be a bad thing, I think in this case it is an anomaly, and since it occurred so long ago, it doesn't matter.

By the way, that printout should give you the total hours of operation...if you multiply that number by 30 to 35 it should give you the approximate mileage on the car. Just a way to check on the actual mileage.

Well that's really more than you want to know, if the car is otherwise good, go for it....B)

Thanks for a very clear explanation! So it's not really an important number. The Car Proof report shows no discrepancy but the car only has around 27,000 miles. From the rough calculations, this means the car was used in much slower speeds and not much highway driving. Is this a right assumption? Possible would be additional clutch wear? Which I would not have any idea, but the report did state stiff clutch which the vender said was "corrected".

Edited March 12, 2010 by hopeforcash

[quinby1]

Hi, I hope to be a owner of a 2003 996 C4 Cab and have a copy of the Porsche Report from the vendor when he purchased it last year. Can anyone explain what the Engine Revolutions Range Report is?

I have

Ignition Hours

Range Number 1 2334 926.4

Range Number 2 1 152.5

Are these good numbers? What do they mean?

Thanks

Ok, here goes....The DME records and keeps a record of the times your engine has hit the rev limiter, as well as at what hour of operation the "over-rev" occurred. On the 996 there are two ranges, 1 &2. Range 1 records the number of ignitions at the rev limiter, in this case a total of 2234 ignitions, the last one happening at 926.4 hours of operation (I would guess somewhere around 32000 miles). It also shows 1 ignition at range 2 at 152.5 hours of operation or perhaps 5000 miles. You arrive at these Guestimates by multiplying hours of operation by an average 35mph. Anyhow, were not done with the fancy math just yet. Now these are the actual number of ignitions recorded by the engine, so if at 7200 rmps the engine is firing 21,600 ignitions per minute or 360 ignitions per second, that means the engine spent about 6 and 1/2 seconds at the rev limiter. How many occasions this represents is a real guess, but more than one and less than six? Totally confused yet? what you really want to know is that it's no big deal. Now the single over rev in range two is supposed to be a bad thing, I think in this case it is an anomaly, and since it occurred so long ago, it doesn't matter.

By the way, that printout should give you the total hours of operation...if you multiply that number by 30 to 35 it should give you the approximate mileage on the car. Just a way to check on the actual mileage.

Well that's really more than you want to know, if the car is otherwise good, go for it....B)

Thanks for a very clear explanation! So it's not really an important number. The Car Proof report shows no discrepancy but the car only has around 27,000 miles. From the rough calculations, this means the car was used in much slower speeds and not much highway driving. Is this a right assumption? Possible would be additional clutch wear? Which I would not have any idea, but the report did state stiff clutch which the vender said was "corrected".

That's a good assumption, if the math shows the hours of operation reflect much lower average speed (say 20 something) then the car probable was used in a lot of short trips at lower than highway speeds.

[1schoir]

In some instances the ONE overrev in range 2 can be an anomaly caused by jumpstarting the car. This sometimes happens when the car sits on a used car dealer's lot and they jump it when the battery dies.

Regards, Maurice.

[coleta]

Maurice, just wondering what supported your above conclusion. Thanks.

[coleta]

bump

[coleta]

Hi Maurice, just making sure you didn't miss this one. Thanks

[valfam]

I"m going to work on a excel sheet to do the math for this.