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What triggers the VVti?

Posted: Wed Jan 20, 2016 7:53 am
by dogger
Hi, im fitting a blacktop beams into my ae86.
i was wondering what conditions the ecu needs to see, to trigger the VVti?
im sure with vtec it needs water temp, oil pressure, revs and >10mph.
i dont have a plug on the speed sensor on my gearbox, so will i not be able to hit the VVti?

Re: What triggers the VVti?

Posted: Wed Mar 16, 2016 6:41 pm
by turbotezza
search google matey i remeber reading about it somewhat pls post what you find

Re: What triggers the VVti?

Posted: Wed Mar 16, 2016 10:03 pm
by Protok
VVTi isn't triggered, it is constantly on adjusting timing as needed.

Re: What triggers the VVti?

Posted: Fri Mar 18, 2016 9:22 am
by RS Tom-Hundred
As Protok says, it is constantly advancing and retarding timing to set it to the optimum level for either economy or performance. This is on both exhaust and intake cam pulleys in the case of the black top 3SGE and it uses the solenoids on the top of the engine to feed oil into chambers in the pulleys to turn then internally and advance/retard them.

Re: What triggers the VVti?

Posted: Mon Mar 21, 2016 5:39 am
by turbotezza
soin therory can all the oil drain out of pulleys if dismantled so the vvti movement can be done by hand??? if you read my post next to this one all comes clear why i ask

Re: What triggers the VVti?

Posted: Mon Mar 21, 2016 5:41 am
by turbotezza
when i say dismantled i mean pulleys taken off cams not pulleys taken apart as i know dont ever do that1

Re: What triggers the VVti?

Posted: Sat Mar 26, 2016 9:24 am
by Tosh21
Yes you can move them by hand (apparently, I've never tried it) but Yea I read somewhere that they constantly move and adjust timing. I'm pretty sure it uses water temp and I assume it's the usual stuff like rpm speed maybe maf for engine load too.

Out of curiosity, Why does it even have a speed sensor on the box I thought that was inky for auto cars

Re: What triggers the VVti?

Posted: Mon Mar 28, 2016 9:23 am
by turbotezza
have no idea ,,road speed ?

Re: What triggers the VVti?

Posted: Tue Apr 05, 2016 9:01 am
by RS Tom-Hundred
When I had my engine apart last year to diagnose a knock, I also found that the cams have a little "free play" of maybe 10 degrees or so when putting a spanner on by hand. One moves more freely in both directions than the other. I think I uploaded a video on here actually to ask if it was ok. Reason I checked was I thought maybe the VVTi was faulty but turned out to be a big end bearing gone.

Re: What triggers the VVti?

Posted: Tue Apr 05, 2016 9:04 am
by RS Tom-Hundred
CORRECTION!

On mine the exhaust side didnt move but the intake side did. I just looked on my Youtube and found the video I did.

Here it is, hope this helps
http://www.youtube.com/watch?v=6RmvZYWTkGY