Looking for a way to keep VCT working w/ the SVT head. - Focus Fanatics
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Old 09-09-2012, 10:25 AM   #1
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Looking for a way to keep VCT working w/ the SVT head.

I've been digging around old threads looking for a way to keep VCT with an SVT head swap. I've found a couple threads that make it look possible.

http://www.focusfanatics.com/forum/showthread.php?p=646051

..and now I can't find the other one I saw. But this same guy talks about having the VCT working on an SVT motor swap with the stock ECU on a Zetec Zx5.

It's got to be possible to pull off --and I want to do it.


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Old 09-09-2012, 01:33 PM   #2
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Basically, I want something like this for a Focus. Does such a thing exist?

http://www.diyautotune.com/vvtuner/index.htm
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Old 09-09-2012, 02:48 PM   #3
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Far as my PRP says, there are controls in the ECU for VCT and the IMRC.
IIRC there are unused pins on the ECU for both. I've never tried to regain VCT on mine, no need for it.

I don't see any advantage to having it. Deleting it costs you $30 and makes life easier IMO.
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Old 09-09-2012, 02:59 PM   #4
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Quote:
Originally Posted by iminhell View Post
Far as my PRP says, there are controls in the ECU for VCT and the IMRC.
IIRC there are unused pins on the ECU for both.
Even on a 2000? I can't find that crap in my Haynes.

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Originally Posted by iminhell View Post
I don't see any advantage to having it. Deleting it costs you $30 and makes life easier IMO.
Why wouldn't I want the VCT? Isn't that the whole point of the SVT head over a FR head with stage 3 cams?
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Old 09-09-2012, 03:17 PM   #5
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It's a Haynes, I'm not surprised the electrical isn't correct. And you have to have both wire diagrams to compare.


The advantage over the FR head is in the design/casting of the SVT head, IMO.


Switch in software:

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Old 09-09-2012, 03:39 PM   #6
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Quote:
Originally Posted by iminhell View Post
It's a Haynes, I'm not surprised the electrical isn't correct. And you have to have both wire diagrams to compare.
Where do I find the schematics with the pinouts?

Assuming the pinouts exist--would I then flash my ECU to control the VCT and dual-stange intake? BTW I tune myself --same software in your pic there.

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The advantage over the FR head is in the design/casting of the SVT head, IMO.
Which one of these will get the best performance with my 2000 zetec with getrag tranny? I'm still stock on exhaust until I figure out legalities.

SVT head WITH VCT and the dual-stage intake somehow renenabled
SVT head w/ VCT elim
FR head with upgraded cams.
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Old 09-09-2012, 03:47 PM   #7
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Can I also renable the dual-stage intake with my current PCM through tuning? If so, this will be FAR easier than I thought....

All I should need are the tables and/or arrays, yes?
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Old 09-09-2012, 04:08 PM   #8
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IMO, all the options are close to the same bolt on HP wise. But the SVT will make more power in the end. I say this because all the dyno's I've seen, a built/bolt on SVT puts down more power always., and now I can't find the damn graph I want but,



That is a very similar build to mine. Differences are the tune, fuel and physical cylinder head. That was a stock ported head with Crower II's and a FRIM. I'm on a ported SVT, SVT IM and tuned on E-85.




The amount of TQ increase I have vs his is proof alone.


Later on the same car swapped to a FR head and that's the dyno I can't find now. It was more power but still fell short of me in TQ.
And to be honest, you don't find many making the N/A power I am as easily as I am. I mean I'm on basically stock parts with good fuel and tuned myself.
I really want to say a stock SVT head is bolt on 20 HP+ conservatively.



Far as wiring goes:

DSI,
ECU pins #3 white/violet, #80 black/white
these will go to the DSI from the ECU. Black is a ground (signal return) and white is the signal to switch the runners.

VCT,
#45 Black/Red, ?


Here is the ECU connector pinout (duratec-ST is the SVT) --> http://www.sendspace.com/file/wqj8cf


Here is the pinout for the IMRC connector:




Here is the pinout for the cam timing actuator:




The "?" for the actuator is because it shares a ground:

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Old 09-09-2012, 04:37 PM   #9
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I saw a thread with Tom's VCT elim kit on the DYNO --he lost 6-7WHP with a VCT delete. If I take a bone stock SVT head, and I mate it to my existing motor, and somehow manage to keep VCT and the dual stage intake manifold, would I have increased performance over VCT delete? 6-7 WHP and a slightly wider power band would be nice.
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Old 09-10-2012, 10:54 AM   #10
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Where did I loose 6-7HP with the VCT Elim ?

You cannot control the VCT or the IMRC with a non SVT ECU

Tom
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