Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec 3.0L Hybrid - Question on the secondaries

Sorry if this has been posted before, but I'm trying to get a handle on something.

When you guys do a 3.0L hybrid using the SVT upper and lower intake manifolds, you have to keep the IMRC that opens up the secondaries, correct? Do you or do you not "pin" them open? If not, is the only reason because the computer isn't tuned for such a situation at low RPM hence the torque suffers? Or even if the computer had no knowledge of the IMRC (say if you used a 2002 Escape computer), the low end torque would still suffer because the runners are tuned that way?

Reason for asking is hypothetically if a 6 owner were to use the SVT UIM/LIM (because a fully ported/polished one out flows that plastic one), would they have to find a way to control the IRMC or just keep it open all the time?

No no no....do not pin them open....Lowbudgetracing did that and saw a low end power loss on the dyno....A SVT hybrid you put thogether the same way as the 2.5 liter.


you use all the parts...secondaries and all...the only thing diffrent is that your using a 3.0 liter block. But i wound not reconmend the pinning the secondaries unless your going to be in the high rpms all the time.

(yes theres a lot more to it..but thats the basics.)

Lupe

Removing them would be ideal on an oval port 3.0. I'm not sure who's tried it on a 3.0 hybrid, but pinning them on a 2.5 does show a low rpm loss, with no extra high rpm gain. Removing them all together would show a loss down low, with a slight gain up top. Maybe the added displacement of the 3.0 would make up for a low end loss.

For the ONE MILLIONTH time...

Pinning your secondaries will ONLY show a power loss.

There is no bonus to gain since they are not "REMOVED"

Also without a tuned chip you car is not programmed to even run properly that way.



Oh yeah...


I haven't had secondaries in years and seem to do okay.

Your mileage my vary...

when i removed my secondaries i got rid of the butterflys and all but two inches of the shaft so i could leave the IMRC in place and not get a check engine light.
i did lose some driveability down low but could fell a gain up top,since then i had my exhaust done and gained more power through the whole RPM band,with this mod my driveabilty has returned to normal.this is still untuned.
i would like to get a 2000 taurus computer and see if i can make it work so i get liner power through the RPM band and not a spike at 3500 rpm.

here is my dyno before and after the exhaust

I think you'll still get that 'spike' in power. Just because that is the way the manifold is designed. Plus, I would think cam grinds as well.

For the last time.



WITHOUT A PROPERLY TUNED CHIP you will never get the best power curve with REMOVED secondaries. Heck not even a close one since the timing & fuel curve (among 20 other things) has to be completely re-written from scratch!


The PCM IS PROGRAMMED for them to be active, installed, and used properly. If you mess with any of those things and DO NOT change the tuning your are proving nothing other then the fact YOU NEED CHIP TUNING...

...which is a GIVEN from the beginning anyway.



Ah hell this is just easier...


ALWAYS USE THE IMRC.
NEVER TAKE IT OUT.
YOU CAN NEVER MAKE ANY PERFORMANCE WITH IT MISSING!

I bet within a month your saying that again ;-)

Originally posted by DemonSVT:

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For the last time.

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