I have a fresh S4 raceported turbo engine with 880cc primaries and 1600cc secondaries, BNR stage 3 turbo, LS1 coils, OMP blocked using 2 stroke pre-mix, and a Haltech e6x. Oh yea, and a v-mount . It is only tuned at 6 psi currently, making 250whp and 210wtq. When I am cruising, it suddenly starts to bog (feels like it starts misfiring). When I give it more throttle, it get worse. I have to let off, then hit the throttle again to get it to accelerate. It is pretty random. Sometimes when I accelerate slowly to WOT, it is smooth. Other times, it will bog. I will be changing the spark plugs before I drive it next, as I can hear that they are on the way. I have heard with the E6X, there is interference with the CAS. I have sheilded wiring from the CAS to the Haltech, so I don't think it could be that. Any other suggestions?

 

TPS possibly? Are you using a stock TPS? If so at least test it and I would recommend also installing a known working one to see if it helps. They can be tricksy buggers.

 

hmm. Ok, I'll look into that.

 

In case anyone is interested, it was the spark plugs. It cleared up 95% of the bogging.