No HTwo O

Jhbrennan, you are correct. My error. I thought you were saying that the GT3 does not have a range 1 over rev. As we know, it does, and a much higher threshold, as you correctly stated. Thanks. Great table posted above.

No HTwo O

Wow, this is loaded with assumptions.

jhbrennan

Here's my real question though (I should probably ask in a separate thread). What is redline for the various engines? My 08 turbo has a red tick at 6600 on the tach but an 08 GT2 has the red tick at 6800...and if the GT3 engine can spool up to 9000 why do revs in that range cause such angst for turbo owners? I know both the turbo and GT3 us the same base GT1 engine and I imagine there are internal engine difference too but what enables a GT3 to go to 9000 without valve float (and other) issues but 9000 would be a range 6 over rev in a turbo.

No HTwo O

Good question. Kevin has covered this before. I need to search for his answer. Or you can send him a PM.

utkinpol

with anything in sections 4+ Porsche can deny your warranty claim if engine goes south. it is not up to dealer to decide - it is corporate porsche that makes this decision. you have some chance to get it covered if you buy a car with CPO and will document all those overrevs before you buy but my opinion - why to bother with this car, there are plenty of others which have clean DME.

good DME read may have 300-500 in section 1, 100-200 in section 2 and 0-50 in section 3. sections 4+ should be all clean.

125shifter

I've talked to a couple of Porsche mechanics, the dealer, and a Porsche engine builder. None of them were overly concerned although the engine builder suggested compression and leakdown check along with an oil analysis.

By my figuring the engine has spent about 5 seconds at ~7,400, about 1 second at ~7,600, about 16 revolutions at ~7,800, less than 2 revolutions at ~8,000 and less than 1 revolution at ~9,000. This really doesn't seem like too much considering my 930 spends a couple seconds in redline everytime I drive it. Granted it's not a stock engine, but it still has much heavier internals than a 997 engine.

At this point I'm planning to buy if it passes my inspection.

Spiffyjiff

i would LOVE to see a complete DME listing of all failed 997 engines so we could actually verify what % had overrevs and what % didnt. i'm no gambler (read: yes i am) but i'd be willing to bet that for every overrev failed engine, there's one (or more??) failed engine(s) with zero overrevs.

i'm not saying a DME cant be used as a possible indicator of engine wear, or abuse, etc, but i think WAY too much stock is being put into this one parameter simply because it's measurable (as oppposed to "how many times was the car dogged when cold", "how many clutch drops or stoplight-to-stoplight shootouts has it performed", etc).

and the more i think about it, it seems to me even porsche doesn't know for sure...otherwise they'd reject ALL failed overrev engines, wouldnt they? yes, yes, i know it's been said ad nauseum that porsche can reject range 4-6 engines, but i also know for a fact (from somewhere on this site, or 6speed probably...but most definitely from talking to my service advisor who has seen it first hand) that range 4-6 failed engines have been warrantied. so what does that say? to me it says even porsche cant prove the overrevs caused it so they capitulate and warranty it.

whatever, just sayin. attack away.

125shifter

I passed on the car. There were too many little things for it to be an over $50K car to me. The main thing was the low miles but high hours. It was evident on the interior.

No HTwo O

Good decision. You made the right call. Don't be discouraged. Stay patient & smart. The "right" car (for you) is just around the corner. The hunt is just as much (or more than) the actual kill!