Yargk

Can ecu replacement hide overrevs?

switchcars

Yes but it's obvious when it's been done if you pull a DME readout. Hours don't match up, among other things. It's very rare.

Ur20v

On other marques when a ECU is replaced they divorce the old one and marry the new one and in that process the iamge and all detail i.e hrs, mileage etc is retained.

Some of this information is also shared in other control modules like the dash or central / body control modules etc.

In this instance the only way to get a totally clean car is to replace all the control modules in the loop and manually input mileage but it shows i the system as an new ecu to flag this.

Note I am not sure if this is the case with Porsche.

Sound dodge to ask as this would hide vital information on the car to prospective buyers.

Yargk

I would be the prospective buyer. I looked at a car that had it listed on the CARFAX that the ECU was replaced and I was curious.

So, if the hours match up, then the overrevs would have been transferred to the new ECU, if there were any?

Ur20v

I would want to know why the ECU was replaced- they do go wrong but it should be detailed in the service history.

As for a definitive answer on the transfer of over rev's should come from Porsche to be of true value.

switchcars

Carfax is not always an accurate indicator of what was actually done on a car. It may have been an ecu tune which does not affect the history at all.

If you can send me the screenshot of the durametric readout showing the total hours, overrevs, vin, etc etc, I can tell you if it's been replaced/wiped or not.

porches

When we replace DMEs we use the tester to read the data off of the old one and then again to write data on the new one so all of that information will transfer over.

powdrhound

I had my DME replaced. The dealer married the DME to the car with PIWIS but everything on the car was at 0. They said that the mileage and over revs could not be transferred.

Yargk

Thanks for all the replies. Strangely the ad said no overrevs, but I got a screenshot of the DME, which although was cutoff so I couldn't see total hours, it did have some type 1 and a couple type 2 overrevs. Will have to think about it...

Izzone

It is not unheard of to swap an ECU for track use then put stock in for street driving...people did it for warranty

juanpablo046

You can delete this without changing the ECU

The New 911

Wouldn't your states local BAR have something aginst this- swapping ecu's out to to record potential over rev's amongst other parameter's? If Porsche was smart about this... If they were smart about it Porsche will have kept su h parameters seperate from the ECU simply just keep if in some form oc flash memory off of the ECU just fof such cases. So people would not be able to cheat the ecu of saving and keeping data.

But then I could be completely wrong about the whole situation. As "They Say, Only one way to find out... Or if you are lucky fine someone who is an expert in these matters.

Izzone

It's completely dis-honest, but was not uncommon...to have an ECU for the track. Some dealers helped people procure them

There are quite a few cars I know of that had two ECUs

I was told that you could erase over revs by s few people, not sure if possible or not

That being said these engines are pretty robust, I've seen a cup over rev to 10 k and be ok

ShakeNBake

you get overrevs when you take it to redline, so if you find a car without any 1st level overrevs, it's because a) something is fishy, or b) it was never driven to fuel cut.

Loess

It was possible to delete over revs on older ecm software versions. I'm not sure about current ecm's.

I would be very suspicious of a car with 0 ignitions in range 1 and 2.