Thanks for clearing things up QuickTD. It's been a number of years since I had a 1.9 ECO - we traded it on the TDI back in 99. Now that I have one again (picked up a '94 with a ventilated block cheap) I'm needing to familiarize myself with it. Regrettably my Bentley is a 97 edition, and is severely lacking in details on the wiring in and around the pump. Time for a new one - as this one doesn't cover my A3 TDI either.
Cheesetoast - thanks for posting that link! Great information. I have two comments/questions - #1 the author advises installing the control cone from a 1.6TD in place of the 1.9's cone, which appears to have a very flat profile. Has anyone done this, and is it a direct fitment as the author suggests? If so, this is definitely an effective method of giving the "ECO" some much-needed balls...
#2, the author discusses our mystery switch on the top of the pump:
1. Il faut dévisser les vis #1 et #2 et retirer la limit-switch. (vous avez probablement un couvert par dessus), Vous pouvez utiliser des tie-rap et fixer la switch ailleurs (mais elle doit rester ouverte) Cette modification permet au turbo de fonctionner à temps plein au lieu de compresser seulement quand vous demandez toute la puissance.
Roughly translated (my french is a little rusty too:)
1. You have to remove screws #1 and #2 and remove the limit switch (you'll probably have a cover over top of it.) You can use tie raps to mount the switch elsewhere (but it must remain open) This modification permits the turbo to operate all the time, instead of only when you need full power.
So, if this description is accurate, then how does this switch keep the wastegate OPEN? I have a KKK03 turbo, and integrate wastegate actuator has to ports on it - one on the boost side that is connected to the compressor housing, and one on the other side of the diaphragm that I can only assume is vacuum. On my turbo this port was capped with a rubber cap.
Keeping the wastegate valve in the open position would require the application of vacuum - from the vacuum pump - so is the changeover valve (mounted by the shock tower) responsible for switching the vacuum to the wastegate based on the setting of the switch on the pump?
I would think boost air is better - the more air, the less particulate exhaust emissions - but do NOX emissions increase at the same time or something?
If this is really the way these engines are set up, it's no wonder my 97 was such a dog.
I think I'm more confused now than ever.
Drew