I had HKS 280s on my car, but being a stock turbo car, they killed the drivability - at least as far as I was concerned. So I sold them and picked up a set of HKS 264s. I havent installed them yet. Im really looking at the JUN 264 cams but had a couple questions. {{before you flame - I read 18 threads about JUN cams and didnt get the answers I was seeking}}

1. Aside from valve springs and retainers, does anything else need to be done to take full advantage of these cams.

2. Is it worth the extra $400 it will cost me to upgrade?

3. Does anyone have a direct comparison they'd like to share?


Critical data:

'03 VIII 55K miles
- I am using Vishnu cam gears
- I will most likely be running an AMS 50 trim turbo - maybe a GT3071...nothing larger.
- I am currently running an Xede, but thinking hard about Autronic

 

i have seen great increases on the jun cams over the hks cams. if you are running a 50 trim then i would run at least hks 272's but i bet the juns will net you way more power. check out the ams forum i rememebr a guy with a 50 trim and the jun cams and he made great power

 

you're going from wussy *** hks 264s to jun-bad-boy-the-label-numbers-don't-mean-****-cams?

you need to read more.

 

Edit: Sorry, after rereading thread starter post I found the answer to my question.

 

yah, what trinydex means

thoe JUN cams are much much much...... much much much much more aggressive than those hks 280s you had on there

 

Even the JUN 264's are bigger than the HKS 280's? I thought just there 272's were? I want the JUN 272's but the tranny comes first.

 

Trinydex: you make no sense.
Kee1pride: I dont see how JUN 264s could be "more agressive" than HKS 280s.

My 1st question is the one I really need answered...by someone who knows. I do not want to accidentally drive a valve into the piston head due to the increased lift.

I know JUN cams are top notch. Im not really questioning their quality. But I dont want to spend $400 or so only to pick up 5 ft lbs or something.

 

bump

 

I don't know the specifics (there is info on the forum somewhere) but the JUN cams have a much higher lift thus needing springs and retainers. From what I've read they pick up power throughout the power band.

My only concern with the cams would be tuning. Most using these cams are running AEM EMS I believe. (I have HKS264's but will be looking for something more aggressive that can be used with the stock ecu w/o stall issues)

 

AMS has a write up on them on their website. Like some one else said it will make power over the whole power band. Most likely the biggest gains will be seen when running a more aggressive setup or high boost.

In other words if you just swap the cams and keep you current setup there will be a significant HP gain (tuning necessary). How much exactly i cant tell you.

 

I thought there was a thread comparing all the cams to eachother. I would check there first and see what fits your liking since your afraid of killing your driveability. good luck

 

I am no expert but I was in the same boat as you I had hks 280s with a gt35r turbo and did research on the jun 264s. Anyhow, the hks 280's effective duration is 222 degrees @1mm and the jun 272 are 235 degrees @ 1mm. Just because the advertised duration says 272 or 280 doesn't mean that's what it really is. However, my understanding is that the jun 264s have more lift on the intake side than the hks 280s. I have been trying to find out what the effective duration for the jun 264s are but I think its more than the hks 280s thus making it a more aggressive cam. Anyhow, the jun 264s should put down more power and better spool than the hks 280s with good tuning. I say its worth it to pay 50 dollars more for the a set of jun cams.

 

I'm in the same boat as you, but I'm currently looking at the Tomei 280's. As far as I know you would only need to replace your valve springs and retainers if they are stock (which in my case mine are not) and nothing else. I have spoken with AMS and according to them it is possible to run a flashed ECU with the Jun cams but it would be a real PITA to tune. As of now I'm running hks 272's with the Apexi rx6 turbo kit making 436ish at 21 lbs. on 93 octane. I'm being told that my cams are holding me back so it's time to upgrade. Oh yeah, I'm also using Autronics. Good luck!

 

JUN's put down helli-power. They are super aggressive and require some extra tuning. Not sure if you need a AMS EMS to harness these, but also not sure if you can tune them very well with just the stock ecu either. I know people running JUN's with the Utec and Xede (ala piggybacks) if that helps.
I do know the JUN 272's are more aggressive than your old hks 280's. Sorry, not sure where the 264's slot in.
Just don't buy HKS because their the cheapest (so many do).

 

i don't know why cam designers go by 264,272, and 280

because jun 264 really just mean stage 1 cams, 272 being stage 2 obviously and so forth.

stage 1 (264) jun cams just straight up throw down a ton of power.

the jun 272's put i think about 80whp more down then the hks 280s on chris's infamous black evo from florida. theres a write up on it in ams's sub forum.