Is anyone trying to unlock tuning the VVEL?

Jordo! · 10-19-2011, 05:14 AM

Quote:

Originally Posted by ChipsWithDips

You do know what VVEL stands for, right? "Variable Valve Event and Lift. It does a lot more than a lot more than a cam timing gear.

It does change lift and duration.

Oh and also the phasing is adjustable too, but that's technically the "IVT" system and not VVEL.

Exactly.

But, then again, if it really can self-correct both lift and overlap that much, then fair enough, but I have to say it is a little surprising.

pulpmelon_Z · 10-19-2011, 05:55 AM

Just a quick query, Is the black trace the full physical limit of the system and the red tace the Computer controlled limit?

wstar · 10-19-2011, 09:39 AM

Quote:

Originally Posted by pulpmelon_Z

Just a quick query, Is the black trace the full physical limit of the system and the red tace the Computer controlled limit?

My understanding on the black-vs-red limits is this: if you crack open the VVEL heads, there's an adjustment that can be made in there. In the service manual it's noted as a VVEL "adjustment bolt". It's supposed to be a fine-tune adjustment done at the factory to set things "correctly", and you're never allowed to loosen it or touch it. They even say with a straight face in the SM, basically, "if you ever loosen this bolt, you must replace the entire VVEL assembly with a factory new one". But you could ignore the factory adjust specs and crank this adjustment out to the maximum limit it allows, which produces the larger black profile. God only knows if the ECU deals with it very well or not, or if it causes damage, etc. You'd have to ask someone who's actually done it.

wstar · 10-19-2011, 09:42 AM

Pic of Service Manual page that shows the adjustment bolts:

pulpmelon_Z · 10-19-2011, 10:25 AM

Thats pretty cool!

It seems like a case of removing the rocker cover, manually locking the arms to max lift and turning the crank over by hand to see if theres any P2V contact...

The Dimer · 10-19-2011, 11:09 AM

Quote:

Originally Posted by pulpmelon_Z

Thats pretty cool!

It seems like a case of removing the rocker cover, manually locking the arms to max lift and turning the crank over by hand to see if theres any P2V contact...

I'm all about P2V contact.

10-19-2011, 09:42 AM	#4 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	Pic of Service Manual page that shows the adjustment bolts: __________________ 7AT Track Car! Journal thread / Car setup details

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Vvel ????	pokeyl	Tuning	8	06-01-2011 03:33 PM
unlock button	js1	Exterior & Interior	7	01-19-2011 10:32 AM
VVEL Tuning	KEVTEX	Tuning	20	10-08-2010 11:23 PM
Vvel	destinyZ	Engine & Drivetrain	13	09-19-2010 06:32 PM
VVEL information?	Orphan	Engine & Drivetrain	4	09-21-2009 12:48 AM

10-19-2011, 05:55 AM	#2 (permalink)
pulpmelon_Z Base Member Join Date: Oct 2011 Location: UK Posts: 23 Drives: 370z Rep Power: 15	Just a quick query, Is the black trace the full physical limit of the system and the red tace the Computer controlled limit?

10-19-2011, 10:25 AM	#5 (permalink)
pulpmelon_Z Base Member Join Date: Oct 2011 Location: UK Posts: 23 Drives: 370z Rep Power: 15	Thats pretty cool! It seems like a case of removing the rocker cover, manually locking the arms to max lift and turning the crank over by hand to see if theres any P2V contact...