VVEL control unlocked

SS_Firehawk

With Superchargers, there is a lot of blow through through the heads and makes it difficult to build pressure. Reducing the overlap and running a less aggressive profile will allow the SC's to get boost up quicker. Don't quote me, but I don't think turbo's have this same problem. It's also a big reason why long tubes weren't making the same power as a stock header because the heads and exhaust were too efficient. It made more power per lbs of boost, but not enough boost to make more power than the stock headers. I feel being able to control VVEL will be a big deal for supercharged cars. Maybe we can reduce overlap to increase pressure, and open it up progressively so it gets top end efficiency. Just a theory, but it sounds good lol.

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Jordo!

Yep, there should still be some advantages NA, but FI greatly changes optimal valve timing. The ideal angle will change significantly as you force a greater volume of air into the cylinder.

Essentially, as I understand it, you want just enough overlap for achieving peak torque -- wrong timing means you just lose boost, blown out before it has a chance to build peak pressure.

With turbos I believe you want as little overlap as possible, as you want to get exhaust gasses flowing as much as possible. I'm more familiar with SC's, so someone correct me if I'm wrong.

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Z370Z011

Hmm, i was actually told the opposite. I had met some guy with a high horse power Z, and told me he supercharged his Z because the VVEL made turbos less efficient than a supercharger as far as reliability goes.

Dont hang me for this, just sharing what i was told lol

which actually made me re-think going TT. idk,

SS_Firehawk

NP, I was talking to Mike@GTM over the phone about it and my long tubes. It's what he told me. Not the VVEL tuning piece, just the blow through effect and long tubes being too efficient. Likewise with a high flowing exhaust. The heads on the 370Z flow really really well.

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Baer383

Firehawk said it well,plus saved me allot of typing.

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2013 ZL1

754 rwhp 747 rwtq

Sh0velMan

All of these comments about blow through would be perfectly valid if we were talking about a system that does anything to the exhaust cam.

Until the variable phasing on the exhaust side is tunable, I don't see how it's relevant.

I don't see how holding the intake closed until the exhaust has closed would net you any real benefit since you'd be waiting until the piston was already on it's way back down before you open the valve. Surely any small gain you get from preventing blowthrough would be offset simply by there being far less time for gasses to enter the cylinder?

I mean, testing and time will tell, of course. Maybe they can work some magic?

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SS_Firehawk

Reducing the duration will increase pressure because less air is being blown through. With boost pressure just being a measurement of resistance, being able to modify how far and long the intake valves open should effectively change how and when the superchargers are reaching peak efficiency. The problem is there is too much overlap. The combustion process is still happening as usual, it's just when both the intake and exhaust valves are open, it's open for too long and reduces pressure. Getting more pressure built up on the intake side should allow more air to be pressurized in the combustion chamber when the intakes do open. Sorry if I'm talking in circles, I'm just trying to hit all the angles.

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Sh0velMan

You could, in theory, make a funky intake cam profile that would work under boost, the problem is that it would be awful off of boost. Like, be a total misery to drive at anything less than 3/4 throttle and up.

Retarding the intake opening would make for some serious drivability issues, if taken too far (read: far enough to make any difference).

This is all in my estimation, so feel free to prove me wrong, GTM!

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SS_Firehawk

GTM hasn't talked about VVEL tuning with me, just the blow through effect. I have no idea if they tried tuning VVEL yet. I have no idea what the tables would look like for VVEL, but I imagine it can be tuned for all types of driving, NA, or FI. I wish there was more public info on the topic though.

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Z eliminator

so what would happen if we tune with the June Cam's ?

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JC671

Exactly... Don't know why this phase ain't available to users to try to mess with. I mean if companies don't have time at least unlock that portion of it for end users to do their testing.


No one knows yet..... Only three known places to have it installed is the JUN team in Japan which has a complete high compression build, Germany's car which is built but no other updates than what is posted here and finally Navyboy916 here on Guam with a GTM head build but there is no access to Dyno here on Guam and he only gets Etunes from Uprev.

From what I just posted Uprev says they are not offering any VVEL tuning ATM so I don't see him getting any (VVEL adjustments) and even if he did get any. There would be no dyno to compare numbers before VVEL tuning and after VVEL tune.

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370zrider

so... we are at the same point where this thread started.

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Jordo!

Well, lets see what Ecutek has to share on this. Allegedly they can access the VVEL target tables whereas Osiris makes their changes in a more indirect way.

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gomer_110

IMO VVEL control will be what makes or breaks ECUTEK's chances with the 370Z crowd. I'm sure I'm not alone in saying that if they can prove noticeable gains from the VVEL tuning even on NA motors that a number of us with Uprev will at the very least consider going to ecutek.

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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock

XwChriswX

Well even if they produce gains, I want to see cars that have their tune after a few months, maybe even a year or so to see how they hold up. That's great if you can "re-invent the wheel" as they claim, but that doesn't mean the wheel rolls straight.

I'm not hating by any means, I hope they have figured it out. I just want to see a few rolling around for some time safely before I put mine under the knife again.

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