I just got my jun 264 cams, springs.retainers,cam gears installed on my evo8 and I have a rough idle. My current setting is 0 ex 0 in.
What is the cam gear setting for jun 264 cams?


Thank you for your help
Sebastian

 

what kind of engine management you have?

 

btw, the best way to idle cams is through engine management, e-manage has an anti-stal feature

 

none but I am thinking about safcII.
I dont think I need a standalone to make the jun 264 cams idle right

 

My current settings are 0 ex 0 intake.

 

no you don't need one, if you get the S-AFC you have to make it run a little richer at idle, I would recomend a shop with experience to change the settings on the cam gears but I think 0,0 should be fine because you will have enough power throughout the powerband

 

I don't think there is a shop in the US that tried the jun cams. Maybe Al

 

you're right, ask him if he has a flash for you, if not he could do a custom one, and you will get better gains from it than the s-afc (can't control timing+Al's a good tuner)

 

the Jun 264 is more aggresive than the HKS 272's right?

-shahul

 

From Boost Solutions Product Descriptions:

HKS offers 264 and 272 cams for the Evo8. The intake lift is 10.8mm, and the exhaust lift is 10.2mm.

JUN offers 264/10.5 and 272/10.8 cams for the Evo8.


There's not that much different between the HKS and JUN 264 cams.

 

The JUN 264 cams are supposed to be more aggressive than the HKS 272. I've been heavily researcing these cams and from what I hear, you will need additional engine management. I'm not sure if you want to go piggy-back (like an XEDE), box-stack (safcII + ebc + ...) or a reflash, but you will need to run some form of upgraded engine management to best use those cams.

At one point Al was using these cams, I'm not sure if he still is. Boost Solutions has also worked with these cams on a customers car. Not sure if they have just finished or if they still have the car in their shop.

 

Like I said in my post above yours, the JUN 264s are just like the HKS 264s except that the lift is a fraction higher. I've got the JUNs in my car and they idle perfectly. You'd need the hearing of a bat to notice the difference between the JUNs and the stock cams. Springs and retainers aren't required for them, although I've got both.

The JUN cams that Al used on his car were the 272s with a GReddy E-Manage which weren't meant for use on the street and a piggyback system.

I really don't know where you guys got the idea that the JUN 264 were more aggressive than the HKS 272s.......................

 

It is the duration (and overlap, but obviously they are related) of the cams that will cause it to idle rough, not the lift. I have no idea what the duration is of either, but the lift isn't gonna tell you diddly about how "agressive" a cam is...once you get to a certain lift, any more gets you a whole lotta nothin. More duration gets you higher and higher peak HP, sacrificing mid range and low end until eventually the car won't idle at all...

 

Yes, from the standpoint that the lobe profile is different, although the lift and
duration are similar.
I was told that the JUNs profile is such that they ramp up to max lift quicker and stay there longer
before dropping back to close.
This is one reason you needed stronger springs, because the rate at which the valves open and
close is quicker.
The valve will float, or bounce off the seats with the stock springs at a lower RPM than normal.

At least this is how it was explained to me.
I decided on the HKS as sufficient for my needs, because I didn't want to mess with the springs.

When I talked to Al about cams, he ranked them HKS 264, HKS 272, JUN 264, JUN 272, from least to
most aggressive. And he has probably tried them all.

 

i thought the same thing, that's why even the jun 264 are hard to idle (i'm not even gonna comment on the jun 272)