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Old 07-07-2008, 12:59 AM   #1
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Default 01 VVT Head on 94 block???

I know that the 99-00 head works on the earlier 1.8L engine but what about the 01+ VVT head? Also would my MS be able to use one if its outputs to control the VVT?
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Old 07-07-2008, 01:56 AM   #2
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the only ECUs that control the VVT that I know of are the hydra and the freedom. The hydra is $2k and the freedom is in japaneese, so it makes things difficult.
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Old 07-07-2008, 01:59 AM   #3
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In fairness, no one has tried to make the ms run vvt either, to my knowledge. Obviously it doesn't do it out of the box or without custom work like the previously mentioned solutions.
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Old 07-07-2008, 05:36 AM   #4
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As I understand it VVT requires a squarewave to drive the solenoid as its constantly variable not just on or off. One option would be to use the EBC driver and PWM map but it hasn't been done yet and I'm not sure how you could get the MS to monitor the cam angle and contantly adjust in a closed loop (it has to do this as it modulates oil pressure to move the cam and the oil pressure will change as you rev the engine). Maybe a second MS1 running the solenoid from the injector driver so you can have a fully mappable cam advance?

Rev has made a separate controller for his VVT perhaps he can chime in?

The other option is to lock the cam in the 0 degrees position or swap in a static cam and remove all the VVT bullshit. Unfortunately you cannot just leave the VVT unplugged as the cam will then go fully retarded and you will make no power :(
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Old 07-07-2008, 08:30 AM   #5
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so do you think I should sell the head and try and find the 99-00 head? What about using the cams out of the 94 head I have?
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Old 07-07-2008, 08:42 AM   #6
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94-98 heads had HLAs 99+ inc vvt had solid lifters. I dont think that the cams are interchangable.
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Old 07-07-2008, 08:43 AM   #7
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Originally Posted by neogenesis2004 View Post
In fairness, no one has tried to make the ms run vvt either, to my knowledge. Obviously it doesn't do it out of the box or without custom work like the previously mentioned solutions.
Jerry & I were discussing the possibility of running VVT off the boost control ouptut. Not as advanced as the Hydra, but should be functional. Untested theory.
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Old 07-07-2008, 08:58 AM   #8
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Yeah, don't just unplug it

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Old 07-07-2008, 09:47 AM   #9
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Yeah, don't just unplug it

Ohh...can I have my cake and eat it too?
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Old 07-07-2008, 11:36 AM   #10
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Originally Posted by TurboTim View Post
Ohh...can I have my cake and eat it too?
there is no cake!

so yeah, square wave with 100% duty is basically a straight voltage and square wave with 0% duty cycle is no voltage. Switch at 4500 or wherever floats your boat.
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Old 07-07-2008, 12:09 PM   #11
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the cake is a lie.
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Old 07-07-2008, 12:17 PM   #12
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Quote:
Originally Posted by Ben View Post
Jerry & I were discussing the possibility of running VVT off the boost control ouptut. Not as advanced as the Hydra, but should be functional. Untested theory.
I dont see why it wouldn't work.
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Old 07-07-2008, 12:22 PM   #13
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yea but in theory communism works too, and we've seen how that turns out.
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Old 07-07-2008, 12:29 PM   #14
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there is no cake!

so yeah, square wave with 100% duty is basically a straight voltage and square wave with 0% duty cycle is no voltage. Switch at 4500 or wherever floats your boat.
Really? So you just switch it full off to full on? Seems really simple then, no need for any closed loop stuff.
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Old 07-07-2008, 12:44 PM   #15
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Originally Posted by disturbedfan121 View Post
yea but in theory communism works too, and we've seen how that turns out.

It's just a solenoid...boost control tables work very well based on tps and rpm, could make it well very well. keep them open down low, and cruise for torque, closed for +4.5K and wot.


and really, the theory of communism is silly.
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Old 07-07-2008, 12:51 PM   #16
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and really, the theory of communism is silly.
Seems to be working for Obama
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Old 07-07-2008, 01:13 PM   #17
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Well, somebody needs to get on this **** and I'm certainly not the one to do it. Can you run 2 boost tables simultaneously on different outputs? ONE actually for the EBC, and THE OTHER for the bastardized VVT?
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Old 07-07-2008, 01:21 PM   #18
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no, but you can run a standalone boost controller. there was a greddy in the classifieds but someone beat me to it.
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Old 07-07-2008, 01:22 PM   #19
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i mean hell, if you just need to activate the solenoid at a certain rpm, the water injection circuit could trigger at rpm...
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Old 07-07-2008, 01:25 PM   #20
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Originally Posted by Braineack View Post
i mean hell, if you just need to activate the solenoid at a certain rpm, the water injection circuit could trigger at rpm...
yeah but you're thinking on/off? I'd rather not only be able to run the 2 extremes. The stock ecu doesn't, and I'd suspect that no one with a Hydra runs the extremes either.
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