Originally posted by stepmar2:
Your power loss is from the SVT TB since it doesn't compliment the UIM or LIM pathways along with the fact that the PCM cannot adjust to this without a custom programmed chip!
What power loss? I was getting 10-12 more hp and tq than a stock car from very minimal mods - even the low rpm tq was higher than stock. My point was that everyone says gutting the main cat will cost power - but my dyno says otherwise. It will obvioulsy be less of a gain than a straight pipe - but it appears that with pre cats in place the restriction of the main cat saps more power than the poor flow of a hollow gutted cat shell. I will say that with a tripple gut I got huge low to mid range bog - 3 expansion chambers and cold sluggish exhaust took there toll.
Anyway, to make this relevant to his question about precats - Id offer my butt dyno based opinion formed after putting a new main cat bacck on with gutted pre cats that the main cat gut is a better mod than doing the precats - but I have no dyno data to prove that.
BTW - the SVT TB casued no problems with the PCM tuning. Lot's of OBD trace data with SVT TB on stock upper and with my dual honed 99 SVT upper and it pulls the mixture in no problem at all.
97 Contour SE MTX
K&N 3530, UR UDP, 19# Injectors, mystery mod, FMS wires, Fordchip.com chip, SVT: TB, Flywheel, clutch, exhaust
04 Grand Caravan SXT
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