Most of the discussion here centers around the 617 but I'd like to learn more about the 606 as I'm sure this engine will begin to get more attention as well in the near future as the 210's become more affordable.

Just some general musings:

It's my understanding from other discussions that the stock 606 pump has little or no performance potential beyond what can be gained by adding a chip to the computer. True or not? Are there larger elements than can be fitted to these pumps? What "model" is a 606 pump? I see M and MW being thrown around in reference to 617 pumps but does the 606 have a designation?

I've also heard that a 603 pump can be fitted to the 606 for more performance. This would make it mechanical however and I need to keep my computer control to be OBDII compliant. What is the designation of a 603 pump?

Electronically, what are the parameters controlled on the 606 pump? I'm assuming timing and fuel. What is the control signal structure of the computer when it's controlling the pump? Square waves? Variable duration and rate?

Do all pumps have a standard mounting face? How about the drive shaft? Is there a standard mount to the drive gear? Has anyone considered mounting a Bosch pump from a Cummins Diesel for more fuel?

Sorry if this is disorganized... I'm just brainstorming... :confused:

I too am interested in performance from a 606. I think my first step would be a chip. I'd like to hear form those who have installed on and get their feedback. Different brands, self installed, chip co. installed. etc.

The 606 pump has two computer inputs, fuel shutoff and rack modulation. There is no rack damper (that I'm aware of). The rack is adjusted with a solenoid, and the position is fed back as an input to the injection computer.

Injection timing is determined mechanically as in the 603 pump.

I've heard that a chip will help the turbo 606, but I don't know what it can do.

So, is the 606 IP a converted 603 pump or is it totally different? It would seem that a chip simply changes the response of the actuator that positions the rack and possibly the maximum fuel delivered. Since it can't effect the advance, that's about all it could do.

to complicate things further still, a pump from a 3.5 liter car can go on the 3 liter engine. This gives more fuel.

What I'm thinking is that a mechanical pump can be fitted in place of the electronic pump and upgraded with larger elements (10mm?). Secondly, the mechanical pump can be fitted with an actuator that responds to computer commands and keeps all the electronics happy.

I too am interested in performance from a 606. I think my first step would be a chip. I'd like to hear form those who have installed on and get their feedback. Different brands, self installed, chip co. installed. etc.

I have a speedtuningUSA chip in the car. Works well. Not self installed. You take your PCM out and they reflash it for you. More power and a little more smoke at WOT

So, if I'm looking for another IP, which one should I look our for? A 603 pump? As I understand it, this can be fitted with 7mm elements. How about a mechanical 606 pump? Is this similar to the 603 pump? Can it also be fitted with 7mm elements?

I've also heard that the mech. 606 pump has a more aggressive cam.

What I'm looking for is a suggested course of action... :confused:

I too am interested in performance from a 606. I think my first step would be a chip. I'd like to hear form those who have installed on and get their feedback. Different brands, self installed, chip co. installed. etc.
Ditto...
Interested in Power and Efficiency gains...

I think I'm going to buy a 603 injection pump just to goof around with. I to at least learn how it's put together.

I think I'm going to buy a 603 injection pump just to goof around with. I to at least learn how it's put together.

GSXR on this forum has posted some pictures of it taken apart.

http://www.w124performance.com/images/OM603_injection/

Those are some great shots! I'd also be curious about what the 606.910 pump looks like. I want to investigate the possibility of grafting the servo mechanism from the 606.962 onto the earlier, "hot rod-able" pump.

Those are some great shots! I'd also be curious about what the 606.910 pump looks like. I want to investigate the possibility of grafting the servo mechanism from the 606.962 onto the earlier, "hot rod-able" pump.

It can't. The body is a completely different casting and the actuator housing will not come close to mating with it.

You could put the myna plungers into the electronic pump but I doubt the computer could handle the change and increased sensitivity without throwing a hissy fit.

So here is what I'm considering right now:

OBD II must remain functional to meet state inspection requirements. There is currently no exhaust opacity test. Just OBD codes and command the CEL on and off.

1. The simplest solution like you say is to put Myna 7mm elements into my existing pump. However, I've been told by some of the European experts that this won't work for one reason or another which was lost in the language translation. Again, as you say, it may prove too twichy for the computer to manage. It's also possible that this may be corrected with a custom chip. There's also the very promising information about delivery valve modifications that may be able to be applied to this pump and I'm watching those discussions very closely.

2. If this is truly the case, I'm looking at gutting an appropriate mechanical pump and attaching the servo mechanism from a drive by wire unit with a custom adapter plate similar to one used to adapt a transmission to a different engine.

3. If this is absolutely impossible, I'll research using a throttle servo from a gas Mercedes or Corvette or whatever I can make talk to the computer to actuate a mechanical pump.

If I truly can't use my 606 pump, it seems that the leading candidates for a replacement are the pumps either from a 603 or the 606.910. I've been told as well by someone in Finland or other European country that the mech 606 pump is superior because of the cam.

So that's where I'm at right now. Induction/exhaust will come after I come up with a suitable fuel supply.

It's also possible that this may be corrected with a custom chip.

Thats the problem, a custom chip. The computer can't be flashed like the TDIs so you have to program a chip and physically swap it inside the computer. Not a cheap option.