JUN High Lift Exhaust Camshafts has be released

The Dimer

I'm just curious how the VVEL reacts to a different exhaust cam. Would it just stay the same or would the computer adjust to "match" the new cam?

XwChriswX

VVEL would just laugh at you and say: "Silly modder, all your timings are belong to us."

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The Dimer

Q8y_drifter

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frydrce

My best guess as to why they said you dont need a new tune is due to the fact that you will physically have to time the cam. This is only the exhaust cam and the vvel is only on the intake. I could be wrong, Im just making an assumption.

Red__Zed

That's the question of the hour.

If phunk's theory is right, there is cl feedback and the answer is yes, at least to some degree...though how effective the system will be at compensating remains to be seen.

If not, who knows how it will behave.

zuperman 370

will an uprev tune be enough, can uprev be used to tune these cams? and will i need to change other internals to accomidate the cams, how agressive are those cams?

Alfamale

you need a tune that can accomodate the change in lift/durations

zuperman 370

Does uprev have the tune option to change lift/duration?

Red__Zed

To those asking about install difficulty, expect 10-12 hours as a competent mechanic.


To those asking about VVEL, this is an exhaust cam.

Jordo!

That doesn't necessarily mean the ECU can adapt optimally to the new profile. They have to work in harmony.

Also, note that JUN provides their own ECU with it. Along with a spark and fuel reflash, it might also have different VVEL tuning in they were able to work with Nissan on it -- we just don't know.

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Red__Zed

Covered here:



Based on what I've seen, I'm positive there is closed loop feedback. We just need to see how good the system is at adapting.

Jordo!

Right... but all closed loop systems are slave to a set of known physical engine environment parameters that they trim the motor's behavior around.

For example, fuel trims aimed at keeping a target AFR that reflects a stoichiometric mixture of gasoline and air will not do a good job of adapting to a new fuel with different stoichiometrics, such as methanol, without changing the parameters. It will just run poorly as it tries desperately to tune for the wrong fuel.

As soon as you change the physical parameters without updating the ECU, it's anybody's guess.

We definitely need more info from JUN.

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G37sHKS

If i remember correctly,

Back in a while, Uprev was able to crack the cams maps in VVEL but they said that they didnt find any kind of gains and they need an aftermarket cams to test it again or something like that...

Well Uprev... you got what you ask for!

Red__Zed

Which is exactly the same thing i said. We don't know how much effort Nissan put into testing the system with things like varied exhaust cam profiles. In all likelihood they did none/very little and the system will choke when you start changing stuff...but who knows?