Hey everyone! I’m chasing a problem on my s4 six port turbo. The car as of now is barely drivable, any light throttle input and the car feels like it’s in deceleration and then bucks like crazy. I’m using a banzai base map with a patch harness to the factory 88 vert harness. VTA1 is locked at 4.5 voltage while VTA2 is around 0.7v closed and 4.6v wide open. I also didn’t see any dropouts while slowly moving the throttle. Any input is appreciated.

 

Sounds like you didn’t connect FRT to 3F

https://www.banzai-racing.com/S4_PFC_install.htm

 

Thats exactly right. I actually found a reply from you on a different thread saying they should be the same, that lead me to double check the patch harness and I had mistakenly spliced the wrong wires together(homemade patch harness). I fixed that but it’s still having issues, for some reason it’s running extremely poorly. It sounds as if it has a dead rotor but the compression tested fine.

 

You answered your own question, homemade patch harness.

 

it actually turned out to be a vacuum leak on the lower intake manifold. Got that sorted and it runs pretty well now. I’m still having some issues with fueling I believe. It doesn’t seem to catch the idle after being under load and will flood 90% of the time if it stalls.