Originally Posted by Steve 96C4S

So there's nothing for my 96 car that would bypass the immobilizer? I hate the immobilizer. Lets just say without being too specific, that for the last 3 years of ownership it has been the bane of my 993 ownership experience. I'd love to bypass it if there's a way.

This chip you found won't work on my 96, right?

Thanks,
Steve

Originally Posted by Steve 96C4S

So there's nothing for my 96 car that would bypass the immobilizer? I hate the immobilizer. Lets just say without being too specific, that for the last 3 years of ownership it has been the bane of my 993 ownership experience. I'd love to bypass it if there's a way.

This chip you found won't work on my 96, right?

Thanks,
Steve

Originally Posted by Lorenfb

"1 chip that does not expect an immobilizer signal"

Right, this has been posted before here on Rennlist, i.e. Just use the
non-immobilizer option DME ECM chip. No relay change is needed,
as posted, just a jumper from pins 30 to 87 which eliminates the
immobilizer control of the #50 from the ignition switch to the starter.

Given all the Porsche DME ECM chip copying being done by the
'performance' chip marketers, a non-immobilizer chip should be
readily available.

"For the life of me I don't understand why this hasn't been common knowledge."

It has been here on Rennlist, not over on the 'Dark Side' where knowledge is
lacking and mis-information is abundant.

Originally Posted by Bill Verburg

'96 won't have a chip, yours needs to be reflashed or replaced w/ a version that has a socketed chip that is replaceable

Originally Posted by Steve 96C4S

I'm not sure what any of this means but I will bring your posts and advice to my indie and see if he can do what you're saying. I will not keep my car much longer if I can't get the immobilizer fixed/replaced/disable/removed/something/whatever. Long story... but it is what it is.

Thanks everyone for the cryptic, super intelligent, overly technical, non-layman like recommendations how to bypass the immobilizer. I don't understand most of what you wrote but will hand it off to someone that will.

Originally Posted by Bill Verburg

'95 993 has a user replaceable chip
'97 & 98 do as well, though of a different design unless you have Row car.

'96 does not(unless it's a normally aspirated RoW version), so if you have a '96 the entire ECU would need to be changed to have the luxury of being able to replace the chip. I have heard that the '96 can be reflashed(reprogrammed) but have no experience or knowledge of that.

Originally Posted by Lorenfb

1. "'95 993 has a user replaceable chip
'97 & 98 do as well, though of a different design unless you have Row car."

2. "'96 does not(unless it's a normally aspirated RoW version), so if you have a '96 the entire ECU would need to be changed to have the luxury of being able to replace the chip."

Hopefully, the above mis-information wasn't found from over on the
'Dark Side' or is repeated hyperbole generally found on the internet
and now mis-informing the Rennlist members?

The '97/'98 993 DME does NOT have a chip like the '95 993.
It must be reflashed which in many cases has resulted in the
ECM no longer functioning properly when scanned by the Porsche
testers and additionally may have problems at a emissions test
because of a problematic OBDII functionality.

Again, all the information on this topic has been posted before
here on Rennlist. One just needs to do a good search!

Bottom line: Please, let's not mis-inform Rennlist members as occurs
over on the 'Dark Side' on an on-going basis, i.e. one poster repeats
hyperbole of another poster! This leads to members here wasting both
time & money in hope of a fix.

Originally Posted by Steve Weiner-Rennsport Systems

.....

You haven't found a "chip" for your 96's DME because there isn't such a thing. Starting with '96, the "chip" is integral to the ECU. So, instead of installing a chip, you must have performance software installed. That is, a talented programmer/tuner modifies the code in your ECU. And, thus, why the 96+ performance upgrade (software) for a 96+ model is so much more expensive than older models.</strong><hr></blockquote>


A clarification might be needed for these '96-on' ECU's.

These do indeed have a chip inside there,.... LOL, its a PSOP device that is soldered in and epoxied in place unlike the earlier cars which used a 28 pin DIP device that resided in a socket.

Typically these EPROMS and are removed, reflashed, reinstalled and then tested.

The '96 ECU's are very different from the '97 and later ones as this one year used a proprietary Bosch 2-chip set that was replaced, not reflashed. Since these special chips are NLA, these ECU's have not been modifiable. A solution is in the works to aleviate this and enable these ECU's to be reprogrammed and other options for multiple chips with different programs will be available.

For now, all '96's need the later, 97-98 ECU to do any chip enhancement.

All '97-on 993's, and all 996's (cable & DBW) can be done by R&R'ing the EPROM and reprogramming it.

Robert,...I have new, USA-spec ECU's here on the shelf at all times.

Hope this helps,.......

Originally Posted by Lorenfb

,.....all the information on this topic has been posted before here on Rennlist. One just needs to do a good search!

Originally Posted by Lorenfb

"Immoblizer issues can be addressed on the OBD-II cars without causing communications problems, IF,...... IF its done correctly."

A very BIG IF!!

With all the problems experienced by late 993 owners with getting the
readiness codes set for an emissions test, i.e. Just do a search and
read all the headaches many owners have with that, why would any
owner with a late 993 want to further potentially cause emission
testing problems, notwithstanding the marginal at best 'performance'
change with a re-flash?

Originally Posted by Juha G

Been there, done that...

First testing:

And then a more permanent fix:

Had to do that to get the Motec running. It was quite easy since I have all the electrical diagrams in the service manuals.