944S2 Weiltmeister Performance Chip

[vette951s]

SOLD! Fits 1989 - 90 S2. Used and comes with original documentation and installation instructions. California CARB exempt. Came in a box of extras with a car I recently bought. Current retail is $250 from Automotion. $40 including shipping to CONUS.

John

[Dimi 944]

I will take it.

[RedBaron]

I'll take it if Dimi backs out!

[beamishnz]

Note the OP states - 90. -91 model designation cars ad different ecu and different injectors so need different chip for these cars.

[jhowell371]

I don't think they ever made a chip for the 91 models.

[beamishnz]

Originally Posted by jhowell371

I don't think they ever made a chip for the 91 models.

Yeah it's interesting. Often see chips listed to cover 89 - 91 but can't see how that would work. ie http://www.powerchipgroup.com/datasheets/partners/26/POR0004.pdf

There are however some outfits that do '91 specific chips ... Wilks specify one for the later DME Porsche 944S2 and Porsche (or Porsche deler??) supplied an enhanced chip in the UK for the runout S2's which they labelled with SE designation. They were supplied with a performance chip and M030 sports package incl LSD and the S4/951S brake set up. I remember reading somewhere that they were made by Promax ProMAX Motorsport. Performance Chip 944S2 28pin who also list both ECU's for their chip ... if it is the same chip for both I can't see how that works.

I had a Powerprom Wilks chip in a 944S and that ran beautifully (and very helpful after sales advice) and since they list a specific chip for the '91 cars they would be my choice.

Sorry for digression from original post ...

[Dimi 944]

Originally Posted by beamishnz

Note the OP states - 90. -91 model designation cars ad different ecu and different injectors so need different chip for these cars.

Actually, it appears there was a VIN split on 1990 S2 and some have the same DME as the 1989 models and others the 1991 models.

[beamishnz]

Originally Posted by Dimi 944

Actually, it appears there was a VIN split on 1990 S2 and some have the same DME as the 1989 models and others the 1991 models.

I believe it was from mid '90 production but those cars were designated '91 model. The change to DME was linked to smaller injectors. I've never read any explanation as to the reason for the change or for any differences in performance. Might be something in the '91 sales fact book?? Which I don't have

[Dimi 944]

Originally Posted by beamishnz

I believe it was from mid '90 production but those cars were designated '91 model. The change to DME was linked to smaller injectors. I've never read any explanation as to the reason for the change or for any differences in performance. Might be something in the '91 sales fact book?? Which I don't have

I don't believe the injectors are smaller but have different impedance which removed the requirement of the injector resistor pack. Same change was carried over to the 968.

[jhowell371]

Originally Posted by Dimi 944

I don't believe the injectors are smaller but have different impedance which removed the requirement of the injector resistor pack. Same change was carried over to the 968.

You hit the nail on the head Dimi. That's the reason given in the 91 S2 Service Information Technik.

[beamishnz]

Originally Posted by Dimi 944

I don't believe the injectors are smaller but have different impedance which removed the requirement of the injector resistor pack. Same change was carried over to the 968.

I don't have the tech bulletin but do have this on file which I beleive is an extract from the bulletin, and is what made me believe that the '91S2 had lower flow injectors. Looks also that 968 had different injectors again.

[Dimi 944]

Originally Posted by beamishnz

I don't have the tech bulletin but do have this on file which I beleive is an extract from the bulletin, and is what made me believe that the '91S2 had lower flow injectors. Looks also that 968 had different injectors again.

They are probably a lower flow injectors but as you could see in the same chart the impedance is High vs Low on the '89 S2 ones.

[beamishnz]

I don't think the impedance effects the flow rate. I have however checked a few other sites re the flow rate of these injectors and they are showing same rate for 0 280 155 003 and 0 280 150 811 both at 264 cc/min. On the same tables they show the 968 injectors at 296cc/min.

See WitchHunter Performance - Injector Cleaning & Flow Testing Services

Interesting ...

[Dimi 944]

Originally Posted by beamishnz

I don't think the impedance effects the flow rate. I have however checked a few other sites re the flow rate of these injectors and they are showing same rate for 0 280 155 003 and 0 280 150 811 both at 264 cc/min. On the same tables they show the 968 injectors at 296cc/min.

See WitchHunter Performance - Injector Cleaning & Flow Testing Services

Interesting ...

What I meant is that the '91 S2 DME injector control circuitry was changed due to the different impedance.

[beamishnz]

Definitely that is right. DME circuitry changed for injectors and some alarm upgrades and resistor pack omitted. What I'm pleased to find out is that flow rate remained unchanged despite some charts showing lower flow rates for 0 282 155 003

[Dimi 944]

Originally Posted by beamishnz

Definitely that is right. DME circuitry changed for injectors and some alarm upgrades and resistor pack omitted. What I'm pleased to find out is that flow rate remained unchanged despite some charts showing lower flow rates for 0 282 155 003

Good info about the injectors. Thanks!

[vette951s]

OK to use this thread for any reason as the chips have been sold (Thanks Dimi!).

Most vendors seem to group all S2s together for injection related parts, which we all know is wrong per the changes made for the 1991 production cars. Good to hear about the flow rates as I also have the Tecnik info as shown in my injectors for sale ad here:

http://forums.pelicanparts.com/porsche-924-944-968-used-parts-sale-wanted/742912-fuel-injectors-944s2-tech-info.html

'91 injectors still available!

John