Contour Enthusiasts Group Archives Forums Modifications Zetec Performance svt zetec contour???

Have you ever seen a dyno chart of a SC'd Zetec? They have no TQ vs a TC and serious LAG. Both the Jackson Racing and the Vortech make their top boost in the UPPER RPMs, hence the poor TQ. A PROPPERLY SIZED turbo makes it's full boost around 3000rpms, giving you great TQ. Why do they make their boost in the upper RPMS? Because they're tied to the crank, via a pulley and as the RPMs go up the SC spins faster. Also a SC, because it's tied to the crank, is a parasitic drag on the engine and isn't half as efficient as a TC.

Then there's the ability to intercool a turbo. The Vortech can be intercooled, but it would have to be a custom job is you tried a Air-Air intercooelr, vs buying their Air-Water setup. The Jackson Racing has no options for intercooling. Then there's the ease of turning up the boost on a turbo vs a SC, i.e. it can be done easily with a TC but not with a SC.

I've been surfing the Focus Forms for almost 2 years now and every SC'd Zetec chart looks so weak in comparison to a turbo'd Zetec. Look in this Forum's FI section, they have a topic comparing current FI options for the Duratec, and even on that bigger engine, SC get soundly thrashed vs a turbo. The only thing a SC has over a TC is they are cheaper than the only proven turbo kit for the Zetec.

Here's some HP figures:

JRSC SVTF kit: 231hp and 170tq at the CRANK at 6psi

Vortech SVT kit: 276hp and 179tq at the CRANK at 10psi

Tom's turbo kit: 282hp and 267tq at the CRANK at 9psi(239whp & 227wtq, early tuning figure)

Tom's stock Zetec Kit: 282hp and 287tq at the CRANK at 8psi(239whp and 244wtq)

As you can see, the numbers for the stock Zetec and SVT are amost identical when turbo'd and KILL any SC's numbers, especially the TQ figure.

If your gonna waste your money on a supercharger, go with the Vortech. It has better intercooling options and has more HP than the JR. Though a turbo still beats it in both spool up and HP&TQ.