Kayaknfly

so I purchased a car, yet to take delivery. It had 0 revs in all ranges... took it for a PPI.
Then pulled the DME after. It now shows 1 rev in ranges 1-4.
Makes me mad since it was all 0's and I was loving it.
Thoughts on that report?

Kayaknfly

Should I be pissed at the shop? It was an Indy Porsche specialist. Or is it most likely an error.
Many chance of hurting resale in the future vrs showing 0 all across?
im not worried about damage to the engine. Just mainly mad.

saabin

So they told you it had ZERO overrevs for 1-6? How many miles on the car?

I dont think I have ever seen a turbo DME that clean with anything more than a few K miles on it. Honestly that would make me suspect that it had been tampered with. these cars rev so fast in 1st that it's really not that hard to register at least ONE type 1 when driving aggressively.

And now it shows a single rev in type 1-4 and zero in 5-6? What is the hour count on the 1-4 revs? That sounds more like a glitch.

thxbuff2001

Check the hours from the over rev.
If it is recent, it could be any people who got hold of it.

Quadcammer

its a glitch. its mechanically impossible to have 1 overrev in the 6 ranges

Kevin

All Zero's??? As Saabin eluded>>

Sounds like the ECU and Gauge cluster go a "haircut"

Kayaknfly

Figuring it's a glitch....
mtc place that did the PPI says it's a glitch also and impossible. But it still makes me curious as to why it would glitch then.
It had 0 over revs before going for a PPI. Now it shows 1 in range 1-4. Right after PPI. Low mileage car.
Just curious what causes glitches and if they are common or something I should worry about.
Othewise DME looks good.

TT Surgeon

$250, any ECU can read zeros.....just sayin

strato58

More importantly, how does the car run and how did the PPI come out? Its highly doubtful the car has 0 over revs especially in range 1

Kayaknfly

It's from a reputable dealer, with low miles and PPI came out excellent, no issues other then a few minor rock chips etc. condition matches mileage.

How hard is it for people to fake/reflash the DME?
Anyway to tell whether that's been done?
Something to worry about on most used porsches or not?
Ive looked at other vehicles with clean DME's also. Rare but they are out there(unless all fake). How would you ever know? I've also seen PDKs with a few overrevs in the 4s etc. but a number of 1 or 2. (Which should be impossible on that car).

Catorce

It's not impossible for overrevs on PDK - it can happen when the driver is on the throttle and the car goes airborne momentarily over a large bump. It is rare but it can happen, and it was explained to us this way in detail during Porsche training.

Never, EVER seen a car with zero overrevs, and I wouldn't trust it even if the report said that.

strato58

Does anyone here have a 911tt or seen one with 0 over revs? That's rare as hens teeth. But it is possible.

Kayaknfly

I've found a few for sale with no overrevs....who knows whether it's honest or not.

Both the seller and the PPI place said they do occasionally see 0 DME reports on certain cars that were drive by certain individuals. Who knows though.

Anyone heard of any confirmed reports of people/places clearing the DME reports and somehow resetting to 0?

Catorce

Yes, you can absolutely clear a DME. One case where it happens is when a motor is rebuilt by the factory or even a dealer for some warranty issue. The DME is then reset to 0 overrevs because it would be incorrect to keep the previous history in that case. So let's say you got a new motor because of a defect, then the dealer must necessarily wipe the DME so it can start fresh.

This means at least someone at the dealership, in concert with PAG, can zero out DMEs. When I took my PIWIS training from Porsche the tech explained all this.

Not saying WHATSOEVER that this scenario applies to the car you are looking at, but it can be done.

You need to not sweat overrevs as much as you are, however. They are a misunderstood metric and often held by neophytes to be ultra important. Take the report in context with the PPI and the condition of the car. On turbos range 1-4 overrevs are extremely common, and some range 5-6 too. Not too many, but a handful.

TT Surgeon

^^this, over revs are over rated, as mentioned it's only one metric of many. Glad none of my 930s had rev counters....the dme is very easy to 'clear', it's also easy to replace with a brand new blank unit. They may also be trying to read it with inferior equipment that possibly can't read the unit.