Pre and post turbo injection in an audi b5 s4

[parmas]

Originally Posted by HYDE16

Is there a way to block the post turbo jet to see the effects of only the pre-turbo? I'm installing a .3mm pre-turbo to start but I forget what the cc rating is.

It is very easy to block the post turbo jet. Just a tap on the water line makes it running pre-turbo only.

The only issue is that I don't want to inject much pre-turbo so I am trying keep the post nozzle fixed while changing pre-turbo flow.

When I reach my goal of lowest air temp at max boost of 18psi, I will make 3 tests.

1. Post Turbo only
2. Pre-Turbo only
3. Post+Pre Turbo

With AFRs used / Ignition Advance / Air Temps @ Throttle Body / EGT readouts / Spark plug readouts including datalogs and graphs