Honestly, I couldn't even begin to speculate on it. I just know that if you swap gears it is thrown off. :p

I think the new 911 has it too, but you can't turn it off like you can in the Z.

This would be sick! The thing I miss the most from my 350 was how the throttle felt trigger happy.

Where did you get that chart if you don't mind me asking?
Reason being is I've taken several Nissan courses (Currently a Nissan Tech) and they've always stated that the max lift is 11mm due to the eccentric cam only being to big. I'm not trying to say that I'm correct or anything, I'm just wondering why they wouldn't of mentioned it.

Another reason being is if there is more lift available, why did they not implement it into the power band? Only reason I could see why not is because our motors being interference motors it could cause a clash between the piston and the valves.

Disable ECT in your ROM.

I have not had ECT enabled for months, don't miss SRM at all.

The response isn't quite as good as a cable, but it's a damn sight better than stock.

Edit: You also lose cruise control and VDC can no longer close the throttle on you, so it's more like a traditional stability control (brakes only).

A site that shall remain nameless under pain of excommunication around here... :icon17:

google VVEL and 370Z in images and it will pop up on the first page ;)

EDIT: Whoops -- it just links back to another thread on here. I'll shoot you a PM.


I'm guessing because of the same factors that result in other tuning limits -- gas mileage and emissions. I find it hard to believe there's no wiggle room left.

Even with ignition timing, where there is not much room for advance, a couple of extra degrees can be safely dialed in, and that nets in reasonable power gains.

I find it hard to believe the valve timing is optimized for power and any other changes result in valves hitting the pistons or power loss. If the tolerances were THAT tight, it means that with just a little valve float at high revs, you'd see mushroomed valves occurring here and there, and I haven't heard of a single failure like that, even though most people bump up the rev limit by a few hundred RPM and plenty of people beat on the car.

Moreover, even if timing and overlap is optimized when stock, slap on a free flowing exhaust, different IM or set of headers and its (potentially) a different ball game.

I haven't had much time to hang out on the forums lately, but UPREV is experimenting with VVEL control. Disabling DTC does net a more "normal" throttle response at the cost of SRM, Cruise Control, and VDC. This is not really necessary, because throttle response (and torque management that causes VDC to be overly invasive) can also be tuned or adjusted. Before anyone goes off the deep end, have a chat with the experts and/or developers. My 2 cents.

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This guy makes me laugh....

If VVEL isn't configurable by SOME tuner SOMEWHERE... well I guess I better stop driving my car, its ROM doesn't exist... ;)

Engine Coolant Temp?

I agree but one thing that people seem to misunderstand around here is just because something is used to provide better emissions and gas mileage doesn't mean it has been made only for that. Think about it; if the hydrocarbons in the air-fuel mixture is burned better or more complete, it will give us better gas mileage, emissions AND power. Just simply increasing the efficiency of the motor.

Yeah... in theory that is true (although with a few more mm of valve lift, that means a greater volume of air is sucked in!), but the reality is you can rarely obtain all three in practice without the risk of jeopardizing two other factors: Driveability and longevity.

For example, many OEM tunes run much richer than necessary under high load, and high engine (air, water, and or oil) temps and or dial back ignition advance, resulting in a less efficient burn and wasted power -- but it substantially reduces the likelihood of ping under extreme conditions.

Also, in general, peak torque tends to be made with a richer than stoichiometric mixture anyway... that might not be true with a good DI system on the same motor (or, I dunno, with water injection), but it's pretty tough to gain power AND use less fuel or produce fewer hydrocarbons in practice on a typical port injection engine.

As to valve lift and overlap on this particular motor -- it's all an empirical question. We simply need more data.

Sorry lmao.

ETC. Electronic Throttle Control. It's a toggle in Osiris.

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FYI...

http://www.the370z.com/engine-drivet...ne-higher.html

I'm fairly certain a good chunk of those gains up top are from increased lift, and not just from the headers.

he doesn't have headers, does he? Looked like intake, test pipes and cbe only

Whoops -- I actually meant to link your thread -- D'OH :owned:

:icon18: Looks like I gained 25 with headers, 12 with tune, and I was already tuned before it.

Any details on the exhaust you're running? I'm fairly sure that's what's keeping me out of the 340+ club.

It started out as Invidia Gemini. When I put the diff cooler in, the muffler section no longer fit, so we removed it and put two glass packs in place. Its pretty much straight through, from headers to exit.
http://imageshack.us/a/img824/2003/imageyqt.jpg

I agree with you, just stating that if fuel efficiency went up because of something, doesnt mean hp will go down. But that's factory OEM talk. Once more serious things get in the equation (like high boost or increasing displacement) there really isn't a way to save gas mileage.

Anyways back onto topic about VVEL unlocked. I want to see some more results!

Although VVEL tuning has to match fuel and ignition tuning, I can pretty much guarantee you that's all due to being able to tweak VVEL.

I'm definitely going to PM John -- I want more details. Headers are going on my car this month :driving:

I gotta tell you, unless they've made huge strides with VVEL since May, it's pretty unlikely they got double digit gains from VVEL tuning alone.

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so i'm wondering, if i were to get some headers, and get vvel tuning unlocked, if i could reach 340whp+....

this is some exciting stuff we go goin on


add some jun cams and we are looking at 350whp NA

Add E85 and high compression. 400 wheel. Add better valvetrain once that is possible and proven. 8500-9500 redline, with power all the way to that point.

Super light wheels. Stiffer bushings and mounts. Eliminate drivetrain loss. 425 wheel.

Well... for the cost of going high compression, forced induction would probably be cheaper and more reliable.

For the cost of the "good" forced induction solutions you could swap in an entirely different drive train. That's kinda my plan, ultimately.

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well... that escelated quickly lol. i am just thinking for bolt on purposes. heck i hope we can bolt on/tune ourselves to 350whp soon

No -- of course not. That's not what I'm saying.

To be clear, you can't tune valve timing and lift without also tuning fuel and spark -- it all works together. But my point is that optimized tuning without being able to adjust VVEL would have resulted in lower numbers than with the ability to also tune VVEL.

My guess is, being able to tune all three netted another 10-15 whp above tuning fuel and spark alone.

If Mike had fuel and spark only tuned with the headers previously and went from about 330 to 342 with a re-tune that included VVEL changes, that is right on the money with my predictions.

Here is a clip Johnny sent me of him messing w/ the VVEL @ idle/ low rpm,'s...... cracks me up. We are learning more and more, hopefully we will get some good results after the build. My car is down right now getting a turbo upgrade and building the bottom end w/ my spare block, which is the reason there is no exhaust at the moment. Updates when they come in!

http://i251.photobucket.com/albums/g..._IMG_09011.jpg

Video doesn't load

:excited::yum: I think I just got chub.

Sounds cool! Im interested in that 350rwhp mark like many others.

Is it the video? Something sounds bad.

It's bad quality, cell phone video. Here is a link to a FB HD version, not sure if you all will be able to see it. Nothing is wrong with the motor/car, building a bottom end for more power. I purchased a spare block.

LINK:
https://www.facebook.com/permalink.p...=share_comment

Anyone know if there's any tuners with the VVEL tuning capabilities anywhere close to NW Ohio?

Or around L.A.

Anyone know if Specialty Z is doing VVEL tuning?

So -- still beta phase or available via download?

Seb told me he's going to start playing with VVEL tuning some time soon.

Just updated software, but no VVEL maps??? Still limited availability?

Is the VVEL setting global or can it be assigned to a map? It'll be neat to have that crazy idle on one of the maps to scare people haha.

What I'm thinking is stock VVEL and throttle map for the 1st slot, and a more aggressive tune for a different slot (good for dry days with good tires).

HOLLY HELL!!! I want a lumpy Z!! That thing sounds wicked.