Superchipped Cupra wont hold boost

[thos]

Folks,
I just bought a '02 Leon Cupra today, it's been Superchipped, but seems to have a problem holding boost at full throttle. It will keep dropping off, and picking back up again, drop off and pick back up again. It will do this right form 3500 up to 5500, usually from 4th gear up. Any ideas where to start troubleshooting ? Still searching, but lots of related posts, so hard to find relevant topics.

Going to get a VAG-COM scan tomorrow, and will try and log some data see what's going on, any tips ?

Regards,
Tom

 

[karl.w]

is it dumping boost through the dumpvalve when on full throttle. then building it up again.
whats the peak boost?

 

[thos]

Sounds like it's dumping and building up again alright. Dont know peak boost, have to play with VAGCOM tomorrow.