Pre and post turbo injection in an audi b5 s4

[parmas]

Originally Posted by HYDE16

Is your pre-turbo progressively controlled by the FAV or is it running off of straight pump pressure, non-progressive?

I am using the AEM progressive control system. Starting injection at 5psi and full at 10psi. Both nozzles use the same pump system and are connected with a Tee-fitting.

The only difference is that the pre-turbo nozzle has a custom made adjustable check valve in order retain it from injecting at low boost. The drawback of the nozzle is that it is more bulky than stock due to the springs.

Check out the attached Plug at last tune. Heat Range is 6 gapped 0.7mm.

AFRs are :

17-19 IDLE
16.5 - 17 Cruising
14s 0-5psi boost
13.5-13 6-18psi boost