VVEL control unlocked

Spikuh · 10-30-2012, 10:51 AM

Quote:

Originally Posted by SS_Firehawk

It might use the throttle map to rev match accurately. I didn't know SRM was so deep in the vehicle. It could be why it took so long for any one manufacturer to bring it to market. Even now, I think BMW may be the only other one that has it on one of their models.

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

b1adesofcha0s · 10-30-2012, 01:59 PM

Quote:

Originally Posted by SS_Firehawk

It might use the throttle map to rev match accurately. I didn't know SRM was so deep in the vehicle. It could be why it took so long for any one manufacturer to bring it to market. Even now, I think BMW may be the only other one that has it on one of their models.

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

asdfsammich · 10-30-2012, 10:31 PM

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

Quote:

Originally Posted by Spikuh

It sounded like there was a way to make the electronic throttle behave like a cable throttle, but in doing so you lose the SynchroRev feature.

Nissanboy · 10-30-2012, 11:10 PM

Quote:

Originally Posted by Jordo!

I seem to recall an old chart from another forum that showed there was more lift possible...

I'll see if I can find the image and post it.

EDIT:

Here...

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.

Sh0velMan · 10-31-2012, 09:12 AM

Quote:

Originally Posted by Spikuh

It sounded like there was a way to make the electronic throttle behave like a cable throttle, but in doing so you lose the SynchroRev feature.

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).

Jordo! · 10-31-2012, 11:04 AM

Quote:

Originally Posted by Nissanboy

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.

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

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.

roplusbee · 10-31-2012, 05:38 PM

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.

Sent from my LG-V909 using Tapatalk 2

Sh0velMan · 10-31-2012, 06:49 PM

Quote:

Originally Posted by show2nite

Spoke to GTM they have no idea about this.

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...

Nissanboy · 10-31-2012, 07:07 PM

Quote:

Originally Posted by Sh0velMan

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).

Engine Coolant Temp?

Nissanboy · 10-31-2012, 07:13 PM

Quote:

Originally Posted by Jordo!

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

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 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.

Jordo! · 10-31-2012, 07:33 PM

Quote:

Originally Posted by Nissanboy

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.

Sh0velMan · 10-31-2012, 08:09 PM

Quote:

Originally Posted by Nissanboy

Engine Coolant Temp?

Sorry lmao.

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

Sent from my SAMSUNG-SGH-I717 using Tapatalk 2

Jordo! · 11-01-2012, 06:58 PM

FYI...

NA: 342/275. Anyone higher?

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

Mike · 11-01-2012, 07:01 PM

Quote:

Originally Posted by Jordo!

FYI...

hp numbers with uprev tune

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

Jordo! · 11-01-2012, 07:09 PM

Quote:

Originally Posted by Mike

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

10-31-2012, 05:38 PM	#247 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 22	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. Sent from my LG-V909 using Tapatalk 2 __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

11-01-2012, 06:58 PM	#253 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	FYI... NA: 342/275. Anyone higher? I'm fairly certain a good chunk of those gains up top are from increased lift, and not just from the headers. __________________ Enjoy it. Destroy it. Last edited by Jordo!; 11-01-2012 at 07:09 PM.

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