Tomei has some also

http://www.tomei-p.co.jp/_2003web-ca...lvespring.html

 

here's a translated tomei link:

http://translate.google.com/translat...istory_state0=

imo its a little funny that their own cams have 11.3 mm of lift, yet they rate the springs for 11 mm of lift...

 

Didn't I post all this info 3 days ago? links and everything

The 11.3mm lift cams will not work with stock pistons, max lift that can be used with stock HR pistons is 11mm

Tomei does not offer a spring for the 11.3mm lift pistons - that is a cam for a very high strung, fully spec'd/built engine; Supertech has a dual spring setup that would work for that

 

Wonder how well the 272 grind would work first as NA and then later on for boost? Hate to change cams twice, but with all the phaser stuff I have to think they could be made to work well in either application, since LSA/overlap is basically variable.

 

Alright, So if I got the 272 duration 11.0mm lift cams and got the valve springs for the 11.0 lift, would the motor be fine considering every other internal is stock?

I am willing to be a guinea pig for these cams, but just want to know a few things first.

 

Just translated Japanese Yen into USD. The valve springs came out to $326. Would that be for all the springs?

 

Seems cheap, I paid $360 for a set of supertechs for the Cobalt, and that was only 4 cylinders, 16 valves in total. They were dual springs with TI retainers though.

 

yes

 

I'd suggest you find an engine builder and talk to them. they'd prolly be able to give you the most valuable advice. since you're in florida, i'd suggest sharif (i know they're in GA, but they have alot of experience with vq's) or japtrix (just recently did an na build on a de for ThreeFiveZero Z)

 

I have Tomei 272's. My idle is very rough with RPM surges up to 1700 rpm. So if your car is a daily driver you may want to reconsider. Had computer reflashed to raise idle and Sharif tried to smooth out the idle issue (unsuccessfully).

I'm happy with my decision because the idle issue is not a big deal to me, but it is definitely not for all people.

 

^^^ you should post up some vids so we can all get a good idea... Did u feel much power gains?

Dyno at all, before and after?

 

I did a big build all at once. Built stroker twin turbo---so I can't say anthing about any individual parts.

 

the quality of the idle is 2 parts - with 272's on a DE, you need the NISMO VTC pullies, and then the subsequent tuning. Idle tuning, as well as the transition from cold start to standard hot temp idling, is the most time consuming thing to do. The surging is simply a natural byproduct of insufficient vaccum, due to not enough intake cam timing advance. Idle will still be quite lopey with 272's but the surging can be controlled with enough time spent

 

^^ Are these kinks apparent in the 264's or 268 cams, Adam?

 

my car idles just fine with the 268's, even without manipulation of cam timing. I bumped the idle to 900 via the Cipher


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at about :13 to :20 you can hear it idle ^

 

Nismo pulley's wouldn't really help with idle. They allow for more ADVANCE than the stock sprockets, not retard. In other words, the intake cam centerline with the VTC off will remain the same unless the retard is built into the cam itself.


Insufficient vacuum is directly attributed to the amount of overlap and exhaust cam timing specifically. When the piston comes down on the intake stroke and the exhaust valve is still open not only does the exhaust dilute the intake charge it reduces manifold vacuum by partially equalizing the pressure in the cylinder. Advancing the intake cam will hurt idle more than it helps since it will tighten the LSA and increase overlap. Maybe you're thinking of dynamic compression?

 

With that said, finally some REAL cams for the HR


Tomei now has some Rev-Up offerings as well.

 

'm about to buy the Tomei 264 poncam for my HR.

In your opinion, how much it's possible safely rise rev limit?

And about the power gain?

Saluti dall'italia