BSF

Hi Daniel,
Thanks for the info. This is very interesting.
Do you know if your 964 harness is mated with sensors typically found on a 993TT engine? Or, when they used the 964 harness and computer did they also install 964 sensors?
Thanks

Ruf-Dan-Ruf

Hi Brock,

I just found out that the engine part of the loom is standard 993 C2. The cabin forward is 964 which is where it plugs into the ECU. So a real mungrel The C2 993 engine bay loom is only 120USD ish so cheap.

I am just having the engine loom replaced today/tomorrow.

Also I am not sure if RUF have added or subtracted additional bits to the loom. We will no doubt find this out when we replace. Will let you know.

taly911

Hi Brock

If you go with the 993tt ECU you'll need

- MAF, mass air flow sensor
- 4 oxygen sensors
- boost control valve
- Idle valve
- air temp. sensor
- injectors

not sure about the throttle position sensor and the Ref. sensor the Porsche part # are different.

Ignition is different, single versus dual plug and no ignition module in the 993tt, I have no idea how to deal with it I haven't done it .

the ECU connectors are different 964-55 pin 993tt- 88 pin.

last thing is the ECU, you'll have to remove the immobilizer.

Tal

John H. in DC Area

I've nothing substantive to contribute to this post, but I did snap this shot of Tal's awesome 965/C4/TT not too long ago...

BSF

Tal,
Thanks for the tips. Very helpful. I have concluded that doing chip modifications to the existing ECU is the most sane way to go. Runners-up are the 993TT ECU or an Aftermarket box, but both of those are radical tear-up's mostly due to the wiring and sensor work required for each.
-Brock

PS- Your car looks GREAT!

Geoffrey

An aftermarket ECU really isn't that difficult since you can use the existing sensors, boost control valve, fuel system, TPS, and ignition system. The largest component is the wiring which unless you want to take the time to read wiring diagrams, you'll have to have someone build it for you.

taly911

Thank you John, I prefer this one.
Tal

BSF

Geoffrey,
Yeah, I suppose you are right... if the existing sensors can be used then a lot of time can be saved. My prior conversions have been with using the Electromotive system, which required fitting all the GM-type sensors to engines not originally equipped with such sensors. In the case of continuing to use the Porsche sensors, I guess the best way is to re-use the factory wiring as well so that you already have the sensor connectors attached to all the wires. In other words, chop off the Motronics 55-pin connector and then make sense of all the wires so that the aftermarket ECU's connector can be added right to the end of the factory loom. Is this the way you have done it in the past, or have you run all new wires and sourced connectors (and terminals) that mate with the OE sensors? It would be really nice if the aftermarket controller company sold a "patch" cable that plugged in to the end of the factory harness and then on the other end plugged into the aftermarket ECU. Talk about "plug and play".... This is the way some of the products for Asian cars are, such as Greddy, HKS, or APEX.
Thanks,
Brock

BSF

One more question:

Does anyone have the Bosch part number for the 993TT 44lb/hr injectors? (Or the Porsche number would be next-best)

Thanks

taly911

Hi Brock

The part # 993 606 122 00, I have a set like new, less then 1000 miles, if you're interested please send me email .
Tal

talyeshaya@aol.com

BSF

Does anyone have a stock 993TT intercooler for sale? Or know where to get one?

Thanks,
-Brock

Geoffrey

The better aftermarket ECUs can use different sensors which makes it easy to use the metric Porsche/Bosch sensors. Typical American companies like Electromotive, AEM, Accell, etc. tend to use only GM components.

I know of one company in the UK that sells an adapter from one of the Motronics to MoTeC, but it was about $700. I've typically designed a new harness because I was adding functionality and sensors not included with the Motronic. However, you could pin out the Motronic harness and connect accordingly with an aftermarket ECU.

Carrera GT

Very nice example!

Ruf-Dan-Ruf

Hi Brock,

Some more info .... My ECU is 964 but has 993 written on it in felt pen. Must be a special Ruf felt pen we think hehe. The factory PS2 does not work when we plug it in, comes up with an error.

The 993 engine bay loom is not altered at all except for the plug going from engine bay to cabin. This is different so we needed to chop and replace.

This isn't much help I realise but my previous post may have set an impression about how you could do your upgrade. This info is useless as we have really no idea what ECU program my Ruf is using.

As I get more real info I will post

cheers

Daniel

hatchy

Hey Dan, hows the rebuild coming along?