Jun reply to my cam shaft email
 

Hey all so there has been a lot of talk about this jun camshaft I am looking into installing them, but don't know anything about them yet for example if they will need support mods or it will be ok to use them with oem springs etc, if a tune will be needed and how aggressive the cams are, well jun replied to my email and this is exactly what they wrote, now I'm neither a technician nor do I have any idea what so ever wht all his means so please ppl chime in and help me make my decision with these, below is Jun's replant my email:

1. First stage : stock cams, stock ex manifold, stock catalistic
convertor, Sport Muffler **339ps
2. 2nd stage : + high comp piston kit and JUN ex cams *363ps

The quote
1. EX cams *jpy 48,000
2. F ccover O-ring *2pc *jpy 856
3. F cover o-ring *2pcs *jpy 856
4. F cover o-ring *1pcs *jpy 440
5. F cover o-ring *1pc *jpy 428
6. Water pump o-ring *2pc *jpy 1108
7. Oil pan o-ring *2pc *jpy 856
8. valve lifters *12pcs *jpy 44,892
9. Roker cover packin *2pc *jpy 3350
10. Roker cover packin 2pcs *jpy 3350
11. Gasket solenoid *2pc *jpy 1008
12. VVEL controll actuator assy *2pcs *jpy 110,880
****have to replace manual but we use them again
13. Clutch release bearing *jpy 13,230
14. Seal material *jpy 3150
15. Transfer charge to Burunei *jpy 25,000
16. Bank fee *jpy 3,000
Total *jpy 260,404
In stock
Thank you,

260000 jpy that works out to more than USD3000. You will not get bang for buck with this install that I'm sure.

So they've got you replacing the VVEL assembly?

the thing that i need to understand is that will buying the cams alone without wht jun mentioned work fine with the oem parts or will i have replace them with these parts and also how agressive are they

may not be just a plug and play install since lift are higher on these cams.

Looks like it:ugh2:

problem is that when Jun put these up for sale they didnt provide much info if any at all

So my take away:

power gains are probably pretty modest. They are claiming ~358 hp with the full support setup, which based on the structure of the quote, I am presuming necessary. Of course, power throughout the range is far more important that peak...I'm interested in seeing a (third-party) dyno.

The support setup is pretty pricey...of which, the only really pricey part is the VVEL actuator...I'd be curious to understand what is needed here. Are they replacing it with a new stock part since they are tampering?

if i take this whole setup how will that affect install and tuning?

If I had the stones and spare money hiding in my couch, I would jump on it. Fact is, it takes more money to increase power on an NA vehicle over a FI one. Most likely someone investing money in these cams, valvetrain and pistons will most likely have all the Bolt on's already on the car. And just an educated guess, I would say pushing 400hp from a NA Z would be more impressive than a 500whp turbo kit. It may not be faster, but I'm sure it will sound like it :driving:

So if I take the full jun package what kind of install are we looking at is it complicated and what kind of tune will be needed will uprev do?

Good luck bro,

Just make sure to mention that your car is AT just incase..

339 ps for cams alone is NOT worth it.

That is going to be less than a 6 hp gain to the CRANK, and I can pretty much guarantee you they are talking flywheel hp and NOT whp.

Even 363 bhp (again flywheel) is not worth it for the full build, given the costs they laid out (over 3 grand USD in parts -- that's not counting labor and tuning).

363 ps/358 bhp is about 300 whp.

Pass.

Those are dyno number not flywheel. And it's still a 27ish whp gain on just cams and pistons. If you gain that much while being full bolt on then I think it's worth it. But if I'll only see 10whp it's not

Someone please by the kit and do before and after dynos :tup:

You know the 339ps is for a muffler, right?

If it gives more than 20 WHP (assuming that the vehicle have all the bolts on and tune) then i think it worth it.

This would be interesting if it would help with spool-time (FI) or low end grunt, but not that interesting to me for increasing top end power. The Z does pretty good @ 4k and above. We just need something for the lower RPM situations!

Not the right cams for forced induction. These are design for a naturally aspirated engine. I believe GTM has cams for an FI kit.

Okay... well get a quote from someone you like on labor for opening the head and installing new cam.

If the numbers work out for you (or if you can do it yourself), go for it!

For me, it sounds like headache + expensive + unsure how the car will run.

Correct... It's going to take a good 10 - 12 hours of labor in order to get these in. $4,000+ for 20 - 30whp? No thanks, I'll put that towards a supercharger or turbo.

You are 100% right about what you said..

But if he have the money and dont mind paying that amount of money then why not?

Yeah... and some utterly selfish part of me hopes he or someone else does do it to prove me right/wrong, 'cause data > theory.

That said... I'd feel way better about anyone doing it if we could tune VVEL.

Yeah, yeah... VVEL for intake cam, but again, intake and exhaust have to be clocked in harmony... one remains untunable and the other will be fixed but different. That sounds too sketchy to me, especially on new fairly expensive sports car.

:iagree:

It's easy to say "it won't work" or "it's not worth it". I feel like the 370 has been around long enough at this point where we can start seeing some new things experimented with instead of just the normal boring bolt-ons.

WHY TRANSFER TO BRUNAI! yesterday night i saw u in Bahrain!!! :icon17:

Those looked like engine dyno numbers, not chassis dyno numbers... thus, to the crank.

Wait, you're giving me this kit? lol jk :roflpuke2:

This has me back on the fence again. I had convinced myself to get a TT kit after my next deplpyment, but now this has me thinking of going back to what I really would like to do which is build the motor up N/A. If you go through with this zuperman 370, I would be curious to hear how it affects the powerband more than any ultimate top end gains. As somebody already mentioned, above 4k rpm it already does pretty good. I'm subscribing for results!