VVEL control unlocked

Jordo!

Update: Finally had VVEL tuned on my car -- details here Proven Power Dyno Database Thread

Short version is: Definitely worth it provided you have done all the other N/A breather mods

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O&G

Yep, JTran has been tuning the VVEL for sometime now! Top end gains are impressive, especially on boosted applications! UpRev has come a long ways.

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Jordo!

Ah, but evidence of N/A gains has not been clear, at least to the best of my knowledge, until now

Or, if already known, then I offer another set of datapoints to confirm

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O&G

I gave up on informing the forum about VVEL tuning a long time ago. Glad you had success, numbers looked good!

UpRev has changed a lot since I started this thread years ago!

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shivers

Do you know exactly what was changed and by how much?

While this is great news with nice results, I'm still a bit nervous about what the safe operating range is before the valves decide to meet in the middle and have a catastrophic party.

Jordo!

There are max limit tables that prevent taking things too far, so no worries of damage so long as you leave that alone.

Based on evidence from other folks with the PPE headers that suggested adding a mechanical restriction to the PPE headers (e.g., a cat) minimized the small dip in torque down low (around 3.8-4.5K), we decreased cam overlap in that region, and made nice gains, with the exception of a very narrow band (about 4 - 4.2K -- seemingly a resonance issue) where it just didn't budge.

Experimenting with increasing overlap there reduced power, and confirmed that we were making changes in the right direction. I suppose we might play with it all more another time -- I'll keep everyone posted.

Anyway, in the mid range to up top, we increased overlap and made nice gains from about 5K to redline. A small touch up of fueling to help maintain target AFR's and we were done.

Generally speaking, the goal is to set cam overlap, duration, and lift to optimize cylinder filling and exhaust pulses at a given RPM so you achieve an optimal mixture for making peak torque -- it can take some trial and error, although we had a few clear ideas of what to change and where.

However, this is a protuner feature only -- email Martin at rsenthalpy@gmail.com for more specific details on the tune or to arrange for a tune yourself.

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bleunetizen

isnt the VVEL already very close to optimum (or shouldnt it be) unless you are changing the exhaust camshaft? it would be strange for nissan to put in so much effort to create this VVEL thing and have it on the market with messed up settings?

it will be interesting to see what kind of gain can be had using longer duration/high lift exhaust cams.. and make it would sound better too!

O&G

VVEL doesn't know what mods you have on your car, NA or FI, playing around with it a bit can help!

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Megan370z

this almost make me thinks about re-swapping the VVEL back in the Z .. lol

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370Z JT

Pretty damn impressive jordo.

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Driftomodachi

Not sure how this adds more power considering Nissan makes the GT-R but subscribed for curiosity

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Chuck33079

What does Nissan making the GTR have anything to do with adjusting VVEL to make more power?

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theDreamer

In a simple way.
Think of this as being able to add a better intake cam to the car, but by doing so via tuning software. It gets more complex than that and some goes above my head.

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Driftomodachi

My thinking is that efficiency is maximized and there is little to no room for improvement. Maybe there is for FI

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2010 40th Anniversary ll GT-R start button ll GT-R map lenses ll Plastidipped fangs and rear valence ll OEM foglight & switch ll Motordyne E370 Cat back ll Motordyne ART Pipes ll Takeda aFe Attack CAI ll Sprint Booster ll Z1 34 row Setrab oil cooler ll Z1 Motorsports M-Spec Shift Knob

Chuck33079

Jordo's dyno results prove the exact opposite, and he's not FI.

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