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Old 10-03-2006, 12:16 PM   #1
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SVT VCT question

I have a Focus SVT engine in a Caterham Super Seven running Jenvey Throttle bodies. Engine management ECU is a Pectel T6. Right now it has the VCT eliminator.

The T6 can control the VCT but I need some information about the control frequency.

I'm hoping someone can help me with the frequency of the signal sent to the VCT solinoid.

If anyone with an SVT and a Occilliscope can help it would be appreciated, alternatly I live in the Thousand Oaks area of Southern California if a member with an SVT Focus is nearby and willing, I can measure yours.

Thanks in advance.

Doug


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Old 10-03-2006, 04:27 PM   #2
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From one Doug to another...
NICE CAR!!

I feel bad though, as I have no idea about the control frequency.
I highly recommend talking to FF member 1turbofocus about this, as he most likely will have the answer you seek.
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We have a Birkin that comes and joins us for our AutoCross events.
Very similar to your car, but has the standard Zetec engine with Webers.
I can only imagine what the extra power and RPM range of the SVT engine is capable of in your car.
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Old 10-03-2006, 05:21 PM   #3
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Thanks for the response.

I've spoken and emailed Tom several times. I bought the VCT eliminator from him. He has been always willing to help, but wasn't able to help me with this issue.

It should be an easy measurement but I don't have the stock ECU or wiring harness to try out.
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Old 10-03-2006, 07:18 PM   #4
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Tell me how to do it and what exactly you need and I'll try and round up some measurements for you...
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Old 10-03-2006, 07:33 PM   #5
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SUPER 7! They are so fun. My friend used to have one with a rotory engine in it. We called it the Rotus. SO cool!
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Old 10-04-2006, 12:57 AM   #6
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In the PCED it just shows a voltage, not a frequency...from what I know, it's an either/or, on/off deal. You wouldn't need a duty cycle or a frequency for that. I'd probably relay it to isolate it from the driver, but it's just a straight solenoid deal like a tranny.

If you ever need any help with the Pectel stuff, just PM me...I've been doing it for quite a while.

Do you know Giles' friend with the blown one? That thing is sick...LOL
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Old 10-04-2006, 01:24 AM   #7
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Turbo Joe

Thanks, I did check my service manual on DVD and you are correct it shows a voltage. Other information I have collected says that this is incorrect.

The old exhaust VCT on earlier Zetecs (exhaust cam only) was an on or off type.

My understanding of the VCT on the SVT intake is that it is continuoulsy variable, it's dithered by the PWM signal from the ECU. 50% duty cycle is 15 movement of the cam, 75% duty cycle moves the cam 22.5 etc.

I was told this by an engineer that worked on the SVT Focus engine. This was sometime after he worked on it and he did not recall the specifics.

This is easy to check and confirm if I can get my hands on a stock SVT for about 30 minutes.

I too know Giles and the wild Swede with the supercharged Seven.

Thanks

Doug
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Old 10-04-2006, 01:52 AM   #8
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I can tell you that there isn't a VCT PID on the NGS that shows any frequency...no duty, no nothing at all comes up on the list that indicates that it's got any variable duty. It just shows on and off.

As far as I've seen, all the operating parts are functionally similar/identical between the Contour/ZX-2 and the SVT.

Besides, there really isn't a way to control the cam angle that way by cycling the valve...it would need a fairly complicated control strategy to keep the angle consistent with higher or lower oil pressure...and for sure there would be PIDs in the scanner to check it.

It would be at least like the FPDM that controls the fuel pressure. More duty for lower pressure, less for higher...it would change from hot to cold and the ECU would have to watch the cam angle and correct it back to where it's supposed to be for the conditions.

But hey...I've been wrong before...LOL :D
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Old 10-04-2006, 01:57 AM   #9
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wow nice car u can come check out my svt its got the stock computer but i live in MI lol

any engine shots???? is it rwd??? any movies???
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Old 10-04-2006, 02:56 AM   #10
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Yep, they're RWD...and they weigh about 20 pounds...LOL The blown one I rode in was like a supercharged shopping cart. :D
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