JUN High Lift Exhaust Camshafts has be released

Jordo! · 02-29-2012, 04:42 PM

Quote:

Originally Posted by 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.

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.

Red__Zed · 02-29-2012, 04:47 PM

Quote:

Originally Posted by 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.

Covered here:

Quote:

Originally Posted by 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.

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.

SPOHN · 02-29-2012, 08:04 PM

Sub'd

theDreamer · 02-29-2012, 08:11 PM

So who wants to buy it and ship them to me?

Jordo! · 03-01-2012, 12:23 AM

Quote:

Originally Posted by 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.

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.

G37sHKS · 03-01-2012, 07:50 AM

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!

SPOHN · 03-01-2012, 08:21 AM

^ that's news to me.

The Dimer · 03-01-2012, 08:36 AM

Is anyone trying to unlock tuning the VVEL?

theDreamer has a post halfway down the page that touches on this matter.

Red__Zed · 03-01-2012, 08:44 AM

Quote:

Originally Posted by 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.

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?

SPOHN · 03-01-2012, 08:59 AM

Quote:

Originally Posted by The Dimer

Is anyone trying to unlock tuning the VVEL?

theDreamer has a post halfway down the page that touches on this matter.

Well then.

The Dimer · 03-01-2012, 09:13 AM

Well I just asked JUN if, all power gains aside, these would be ok to run on a stock motor or if the additional modifications they made would be necessary (primarily the fuel injectors and the ECU). Hopefully they get back to me soon.

But it is 11PM over there right now, so I may have to wait a bit. lol

theDreamer · 03-01-2012, 10:22 AM

I will shoot another email to Uprev and see what they say.

indyn · 03-01-2012, 10:42 AM

can the JUN cams be used with exhaust camgears? Jim Wolf Technology website

370z_Sniper · 03-01-2012, 01:45 PM

I would like to know if I can install this cam on a stock engine and how many hp it can add?

Anyone know about the Stillen pulley if it work good or no?

The Dimer · 03-01-2012, 02:02 PM

Quote:

Originally Posted by 370z_Sniper

I would like to know if I can install this cam on a stock engine and how many hp it can add?

Anyone know about the Stillen pulley if it work good or no?

I'm waiting back to hear from JUN on the stock engine question. They are all sleeping right now over in Japan so hopefully I will get an answer later today.

02-29-2012, 08:04 PM	#33 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 46 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	Sub'd __________________

02-29-2012, 08:11 PM	#34 (permalink)
theDreamer A True Z Fanatic Join Date: Feb 2009 Location: Texas Posts: 30,879 Drives: 370z Rep Power: 4210	So who wants to buy it and ship them to me? __________________ theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN theDreamer's Silvia // URAS // GREDDY Houston Zs // Facebook // Twitter // Instagram

03-01-2012, 08:21 AM	#37 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 46 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	^ that's news to me. __________________

03-01-2012, 09:13 AM	#41 (permalink)
The Dimer Track Member Join Date: Mar 2011 Location: Bolingbrook, IL Posts: 632 Drives: 2010 PW 370z Rep Power: 15	Well I just asked JUN if, all power gains aside, these would be ok to run on a stock motor or if the additional modifications they made would be necessary (primarily the fuel injectors and the ECU). Hopefully they get back to me soon. But it is 11PM over there right now, so I may have to wait a bit. lol Last edited by The Dimer; 03-01-2012 at 09:18 AM.

03-01-2012, 10:22 AM	#42 (permalink)
theDreamer A True Z Fanatic Join Date: Feb 2009 Location: Texas Posts: 30,879 Drives: 370z Rep Power: 4210	I will shoot another email to Uprev and see what they say. __________________ theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN theDreamer's Silvia // URAS // GREDDY Houston Zs // Facebook // Twitter // Instagram

03-01-2012, 07:50 AM	#36 (permalink)
G37sHKS A True Z Fanatic Join Date: Feb 2010 Location: Dubai Posts: 1,183 Drives: 09 G37S Coupe 7AT Rep Power: 20	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!

03-01-2012, 08:36 AM	#38 (permalink)
The Dimer Track Member Join Date: Mar 2011 Location: Bolingbrook, IL Posts: 632 Drives: 2010 PW 370z Rep Power: 15	Is anyone trying to unlock tuning the VVEL? theDreamer has a post halfway down the page that touches on this matter.

03-01-2012, 10:42 AM	#43 (permalink)
indyn Base Member Join Date: Apr 2011 Location: farr north Posts: 241 Drives: 11 BMW 335i 6AT Rep Power: 14	can the JUN cams be used with exhaust camgears? Jim Wolf Technology website

03-01-2012, 01:45 PM	#44 (permalink)
370z_Sniper Base Member Join Date: Mar 2011 Location: UAE Posts: 25 Drives: 2010-370Z-White-M Rep Power: 14	I would like to know if I can install this cam on a stock engine and how many hp it can add? Anyone know about the Stillen pulley if it work good or no?

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