Adding the 3 bar map sensor atm wouldn't do a terrible lot for you. You really need the turbo to do more. Bigger injectors like seatmann said. Then it would be good to have.
I was still on the standard clutch when I sold it. It was slipping on the rolling road but I only ever got it to slip on the actual road when doing a 2nd gear launch in the wet to see if I could cut down on wheel spin. It was an import with no aircon or edl, esp etc and weighed 1289kg fully fulled and no driver. Thank you works weigh bridge.
This fella's not doing too bad for power. Although he doesn't mention a 3 bar map sensor.
http://www.youtube.com/watch?v=kB14rGB5BVg&feature=plcp
You can add more fuel which will make more boost which will get to a set level where the ecu will either limit the boost pressure level or put the engine in limp mode. I'm not too sure by what means it informs the ecu of the operating parameters but the sensor permits higher boost pressures to be run. Kerma recommend informing your tuner to stop turbo damaging pressures being reached. To be honest I never had a boost gauge on the leon so can't offer an informed opinion on the safety aspect of things from my experiences.
http://www.kermatdi.com/servlet/the-82/3-BAR-MAP-Sensor,/Detail
Here's a link for the homemade tuning box for the leon.
http://www.passatworld.com/forums/42-volkswagen-passat-b5-discussion/136620-tdi-tuning-powerbox.html
It should work for the cordoba as well. I neglected to note the connecting wires at the wiring harness and the link is blank of info unless you can read norweign, I think. Hopefully I'll get it wired up this weekend. It wasn't too smokey in the leon. Just a bit of stur before it came on boost then a light grey haze. The cordoba weighs 1226kg so shouldn't go too badly with about 150bhp. That's what I'm going to try and torture the turbo out too. Most of the ahu engines on the tdi forum stop at about 135bhp on the standard turbo.
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