CarterRuss

This is what I was sent when I asked for the DME. Given the lack of info I am assuming it is Range 1 through 6 going down.

Body In White

Yikes. You’re going to want to get the current operating hours, and the operating hours for when the last range 5 and 6 occurred. All of that is stored in the DME and is visible with a PIWIS or Durametric tool. That’ll give you a better sense of how long ago those over revs occurred.

Busta Rib

Personally, I would avoid any cars with over revs in range 4-6. No bueno.

CarterRuss

Would be why this car hasn't moved in 7 days my guess. Salesman yesterday: "this will move fast!" Well...it hasn't yet so I'm guessing it won't.

Kyzcreig

That is a pretty rough DME.

Hootsama

Man. Not a good report. The stories these cars sometimes tell.

CarterRuss

The nice thing is that they tell them. The unfortunately gamble in the used market but it's nice to have some look behind the curtain.

bweSteve

I agree. And a screen capture like that is basically useless without the additional data. Plus, if it is in order of 1 - 6 in downward order,.. then it does not make sense that range 6 would have a higher number than ranges 4 & 5. Not to say it hasn't been seen that way with other readouts,... but guys with a lot more knowledge than me have said that its an anomaly, and possibly some glitch occurred with the DME capture. I've also heard (from Doug Tabbutt at Switchcars) that those modules can actually be erased & start over,... but in that case the number of engine operating hours would definitely NOT be in line with the number of miles on the car.

If you find the operating hours, then divide by the total miles & report back on the "average speed". That number can tell a lot too.

Rule of thumb: If the over revs occurred more than 200 operating hours ago (& assuming the engine has not locked up since that point), then the engine is probably fine. Assuming no money shift & total rebuild on the car.

Oh, and personally I know what the limits are for ignitions on 996 & 997 GT3's (which, for 997 GT3's it does not strike a ignition count unless the car hits 9,000 rpm).
For example, Range 1 on a 997 GT3 is between 9,000 & 9,200. Range 2 is 9,200 to 9,400. Range 3 is 9,400 to 9,600. Range 4 is 9,600 to 10,000. Range 5 is 10,000 to 11,000. Range 6 is over 11k.

But on a GTS, I do not know what those limiits are.

Anyone have that data for all 997 GTS ranges?

Body In White

From: https://911virgin.com/engine-revs/

997 Carrera Over rev ranges

Range 1: 7300 - 7500
Range 2: 7500 - 7700
Range 3: 7700 - 7900
Range 4: 7900 - 8400
Range 5: 8400 - 9500
Range 6: > 9500

Red line on the 3.8L in the GTS is 7200. Someone zinged that Aqua car good.

Prairiedawg

Actually in a 997.2 GTS, the redline starts higher than the base and S models. Published data I've read states the redline starts at at least 7500 rpm's and it might be higher than that. I have put mine deep in the red before (between 7500 and 8k) and only logged range 1's.

Somebody screwed up bad on that one.

nwGTS

All 997 GTS NA cars came with a sunroof. No option to delete.

Petza914

The overrev ranges for the 2 cars are different than for the .1 cars. The table listed here looks like it's for the .1 cars, so up through 08 and including the 09 for the Turbo only (Turbo didn't go to the DFI engine tech until 2010).

Liste-Renn

I found this blurb in my 997 GTS Tech file- but neglected to cite the author/source:

“And on a pedantic note, the tachometer is a carryover part from the Carrera S and has a 7300 redline graphic (when fuel cutoff occurs) BUT the GTS with the X-51kit redlines at 7500. Porsche also neglected to change the over-rev range to accommodate this so GTSs can trip Range 1 over-revs all day and not have ever hit redline.”

Ergo, a DME over-rev report for a GTS may show range 1 over-rev history, but they are invalid, since redline is 200rpm higher than 997 Carrera limit. Range 2-5 (higher exceedences than 200rpm) remain valid.

I posted this on another thread and @prairiedawg corrected it with info that the GTS' DME is revised from a Carrera S, so Range 1 exceedences are not recorded at >7200, but instead at >7500. He reports that his GTS DME remains clean despite exceeding 7500 a few times.

I really should view my own, as it spends plenty of time bouncing off the rev limiter- which I see, and feel, when the fuel topping begins and the power/rpm both are reduced..quickly and dramatically.

Prairiedawg

Yes, this is true. I have gone past 7500 more than once, probably to around 77-7800, and never actually bounced off of the rev limiter. I don't know how high for sure, it spins up and down so quickly. I purposely bought a Foxwell NT530 to check the DME because I was sure I exceeded range 2 and possibly range 3 from driving the RPM's too high before shifting. I thought something was wrong with the car because I had easily exceeded 7500 and never bounced off the limiter. The Foxwell confirmed that only a few range 1's had occurred and I was relieved my DME was still "clean".

The rev ranges for the 9A1 motor seems to be a bit of a mystery. I have never seen any official published data on exactly where they are in 997.2 or 991 engines. the redline in 997.2 engines is 7300 but is raised to 7800 in 991.1 motors. I suspect the 997.2 Powerkit is closer to the 991. In a brochure for the 991 Powerkit, it claims the 997.2 upgrades contain a new aluminum intake manifold, modified cylinder heads, increased engine speed, sport exhaust system, and modified engine application. I'm not sure what that last one means.

Also, if you look in this crappy picture from an old X51 brochure, you see the HP rating shown going past 7500 to about 7600. I don't know if that's relevant but that's about the only "official" anything out of Porsche.




@Body In White , you have access to all that wonderful production material, is there any chance you would have access to 997.2 and 991 rev ranges, official or not?

jbkusa

Since we are talking DME reports... I have a dumb question...

With a PDK car, is it possible to get into any of these ranges ( 2,3,4,5,6)

Asking for a friend?