3.6 brains and wire harnesses

[fastbacker]

Let me see if I've got this right:

89-91 = aluminum intake w/ barn door afm
92-94 = plastic intake w/ barn door afm
95 = plastic intake w/ maf (obdI)
96-98 = varioram (us=obdII, row=obdI)


What I'm trying to figure out is interchangeability of brains and wire harnesses - maybe with slight modifications.


Thanks-
Craig Backer

[Steve@Rennsport]

Craig:

Pretty much all of the 964 ECU's will interchange: the .450 & .473 units.
These are 55pin versions

'95 993 ECU's (3 US versions) are unique to themselves even though they are 55pin units, too.

'96-'98 ECU's are all 88pin units (3 US versions) and will interchange. The Immobilizer (drive-block) must be dealt with to start the car. (USA-only).

[Bill Verburg]

Originally posted by fastbacker
Let me see if I've got this right:

89-91 = aluminum intake w/ barn door afm
92-94 = plastic intake w/ barn door afm
95 = plastic intake w/ maf (obdI)
96-98 = varioram (us=obdII, row=obdI)


What I'm trying to figure out is interchangeability of brains and wire harnesses - maybe with slight modifications.


Thanks-
Craig Backer

That about sums it up. To add to Steve's response all the 964 and 993 OBD1 are 55pin, all the US OBD2 are 88pin

My RoW '97 3.8RS vram is perfectly happy running in a '95.

I was told that a chip would solve the immobilizer issue, but apparantly not so on to plan B for that.

[fastbacker]

Could you remove the varioram intake from a 97 us engine and install a 95 intake - using the 97's brain and harness? I was told you could. It just wouldn't run optimally under 5k rpm's. The reason I ask is because I have a 97 us engine that I need to run a 964 or non vram 993 intake on for class reasons (prc gt-l).

Thanks-
Craig Backer

[Bill Verburg]

Originally posted by fastbacker
Could you remove the varioram intake from a 97 us engine and install a 95 intake - using the 97's brain and harness? I was told you could. It just wouldn't run optimally under 5k rpm's. The reason I ask is because I have a 97 us engine that I need to run a 964 or non vram 993 intake on for class reasons (prc gt-l).

Thanks-
Craig Backer

Yes, my '95 engine is in the chassis w/ the '97 RoW harness and DME

[fastbacker]

Bill-
I confused by your two posts. Are you saying you have a 95 block with 97 row vram intake, brain and harness in a 95 chassis?

[Bill Verburg]

Originally posted by fastbacker
Bill-
I confused by your two posts. Are you saying you have a 95 block with 97 row vram intake, brain and harness in a 95 chassis?

I swapped engines but left DMEs and harnesses in situ

the '97 RoW 3.8 is in the '95 and the '95 US 3.6 is in the '76C3 w/ the RoW harness and DME

[Lorenfb]

"I was told that a chip would solve the immobilizer issue"

That's absolutely correct for a '95 993!

[Bill Verburg]

Originally posted by Lorenfb
"I was told that a chip would solve the immobilizer issue"

That's absolutely correct for a '95 993!

interesting, it didn't help on mine

[fastbacker]

Is the only difference between the 964 and 993 plastic intakes the use of a maf sensor compared to afm? That is, aside from the 1.5mm wider stacks and runners on the 993.

Thanks-
Craig Backer

[84toy]

Originally posted by Lorenfb
"I was told that a chip would solve the immobilizer issue"

That's absolutely correct for a '95 993!

I thought the immobillizer (Driveblock) did not start until 96 and 95's with a 55 pin did not have it......

[fastbacker]

Originally posted by Bill Verburg
interesting, it didn't help on mine

Bill-

Are you saying the 97 ROW dme with a new chip did not remove the drive block?

[Bill Verburg]

Originally posted by fastbacker
Bill-

Are you saying the 97 ROW dme with a new chip did not remove the drive block?

We are still working on it, but as of today, no. We are jumpering the relay to bypass the driveblock.

In my case it is a US '95 DME and harness w/ a '97 RoW engine.

[fastbacker]

That's surprising. I was under the same assumption as lornfb. I thought it was just 96 and up that had the drive block.

This worries me seeing as that I'm close to buying a us 95 dme.

[Bill Verburg]

I was told the same by several reliable sources, it may be true but so far hasn't worked out on mine. We will see as it is still a work in progress.

[fastbacker]

I guess I'll cross my fingers and hope the 95 dme I buy works with a chip.

[DW SD]

My '95 DME had no driveblock. It also has a chip.
I recommend the Steve Wong massaged chip. He took dyno results and fine tuned the chip for my application.

Doug