Differences in 993 model year's

[autobonrun]

I'm familiar with the HP increase in the '96 over the '95 but can someone summarize the main differences between the various year 993's?

[Eric Coffey]

Changes for 1996: The new Targa, C4S (turbo-look coupe), and Twin Turbo models. 96 also brought the new Varioram induction, increasing HP to 282, from 270.

-Eric

[This message has been edited by freefly (edited 07-15-2001).]

[David--Edwards]

Really the only difference is that in '96 they went to varioram, OBDII, a mandatory keyless entry system, and a little louder exhaust system. I went with the '95 car because I didn't want the complexity of varioram, or the keyless (key fob only way to unlock)

David

[Bill Verburg]

'95 OBDI 993:
These are the last Porsches to have their chip in a socket. Its a 28 pin DIP device and its easy for the owner to swap another one in and out.

'96 OBDII 993:
These are the first of the OBDII cars and the first Varioram engines offered here in the USA. These DME's had a one-year-only internal architecture that used 2 proprietary Bosch devices to perform the OBDII duties. Bosch no longer makes nor supports these DME's and they are now superceded to the 97-98 ones. Those 2-chipsets were not EPROMs and required replacement to be programmed and they are no longer available.
These '96 OBDII cars require the later DME to be chipped or the Program piggyback unit. The immobilizer codes must be set by Dealer into a newer DME to retain that feature. We can disable that function in software for racing purposes.


'97-'98 993:
These Varioram cars use a different DME than their predecessors that employ a single, flashable EPROM. These cars can be reprogrammed by flashing the chip after removal. One can also use the Program piggyback unit.

[88911coupe]

What does OBDI mean? I am guessing on board diagnostic interface or something like that. A friend just bought a 95 993 and I am sure he'll be asking me technical questions.
Thanks,
Buck

[autobonrun]

Originally posted by Bill Verburg:
'95 OBDI 993:
These are the last Porsches to have their chip in a socket. Its a 28 pin DIP device and its easy for the owner to swap another one in and out.

'96 OBDII 993:
These are the first of the OBDII cars and the first Varioram engines offered here in the USA. These DME's had a one-year-only internal architecture that used 2 proprietary Bosch devices to perform the OBDII duties. Bosch no longer makes nor supports these DME's and they are now superceded to the 97-98 ones. Those 2-chipsets were not EPROMs and required replacement to be programmed and they are no longer available.
These '96 OBDII cars require the later DME to be chipped or the Program piggyback unit. The immobilizer codes must be set by Dealer into a newer DME to retain that feature. We can disable that function in software for racing purposes.


'97-'98 993:
These Varioram cars use a different DME than their predecessors that employ a single, flashable EPROM. These cars can be reprogrammed by flashing the chip after removal. One can also use the Program piggyback unit.

Then, if looking for a 993, do you think a 95 would be preferable over the 96 due to the complexity and ability to easily change the chip or does the increase in HP of the '96 justify the complexity and additional cost?

[Bill Verburg]

OBD I & II Federally mandated data logging, aimed at reducing pollution via better servicing of vehicles.

for transplanting 95's are as easy as 964's, 96 and up are nightmares.

for owners it doesn't matter, variram is nice but not that big a deal performance wise. I would want it, but thats a personal decision. Do you intend to chip? That would be another cosideration. All of them can be chipped, you just need to be careful where you buy.

The usual advice of buy the newest car you like still holds.

for more info go to

http://www.obdii.com/
or

http://www.epa.gov/otaq/obd.htm


[This message has been edited by Bill Verburg (edited 07-17-2001).]