Hfs4 or 3 for 996tt?

[infinkc]

I have both systems from previous cars, just curious if the hfs4 would be an over kill for the 996tt? I had The hfs4 for a direct injection engine.

[Richard L]

Either system will work. HFS4 has a but more tweaks on the flow curves compared to HFS'3 IDC tracking (mainly).

I think HFS3 with 30% boost compensation is more than adequate.

[infinkc]

thanks richard. any idea what size jets to run? running stock turbos 1.1bar.

[Richard L]

1.5cc/hp @M50/W50 is a good starting point

The 996T does well with 2x 1.0mm.