NEED HELP! Hilborn injection

[Mathi]

Hi,

I have a Z502 Chevrolet crated engine with a Hilborn fuel injection system on it. It's an electronic fuel injection with Fast ECU and other electric parts.
Now, the injection works perfect only if you stop throttle, there is some bangings in the exhaust . Everytime we stop throttle, there are those annoying bangings. Really loud.
Just like too much fuel...
Now, we tried everything... We contacted Hilborn and they helped us out with some instructions but it was worse after those instructions.

Now, I live in Belgium and we don't know anymore what we can do. We are far away with a system that doesn't work as it should. We have contacted here in our country, the Netherlands, Germany, etc fuel injection specialist but nobody knows this system good enough to help us out.

Can someone help me out?

Thank you!

This fuel injection system:


http://www.hilborninjection.com/prod...=429&CatId=174