I am looking for the SCC dyno charts for these cams. I cant find the web link, or was there even one? I was looking to get the S4s, but I would also like to hear some impressions from you guys who have one or the other installed. MY car is basically doing auto-x and track events, so, i dont want to lose too much low end as i do more auto-x then track events.

so, what are some opinions?

With the s4's you will gain a little more top end then the s3's, but then your also sacrificing some low end power. If you go with the s3's, its a good balance of overall power both at low and high end. Plus, if you dont get the jwt ecu program immediately, the idle and driveability of the s3's is more tolerable then the s4's. Jwt ecu does allow you to rev up to 7800 rpms, which will aid in utilizing the power of the cams. however, if you have a high port sr20 with a redline of 7500, then you should notice the power gains of the cams quite nicely. Hope this helps!!

I love my S3's, at least I think that they're S3's. Bought them used from a guy a while back. They do the trick for sure. Once you hit the 4000-5000 rpm range they really kick in.

MY car is basically doing auto-x and track events, so, i dont want to lose too much low end as i do more auto-x then track events.
The I would recommend the S3 cams as the S4 cams have less bottom end torque than the S3s.

I have the S4's installed on a JDM SR with the only other mod being a PS header. The car almost loses traction around 5500 rpm's then rips to the redline pretty nicely, the 1-2 shift is accompanied by a good long chirp, and 3rd hits with a quick peep of the tires. The car makes alot more power around 5500-7500 than it used to. I guess there is some lost low end power, but not too much, or to be really noticed. I like what I have, and the drivability is just fine, there is a little lope at idle but not bad. I like the idea of going with the little bigger cam. But that's me...

Originally posted by Subculture

The I would recommend the S3 cams as the S4 cams have less bottom end torque than the S3s.

I have seen the dyno charts now for both cams, the S4s give more power up top and lose less the 1 hp and 1 ft/lb of torque @ 3000 RPMs. Im going with the S4s. Thanks for the info guys...

S3 - .447 lift 260 degrees
S4 - .465 lift 266 degrees
C1 - .476 lift 264 degrees
C2 - .500 lift 275 degrees
C3 - .526 lift 285 degrees ...WOW!!!!

Also, with JWT cams it isn't just the lift and duration of the cams, but also the assymetric lobe shape.

hehe yah, the c-series really shouldnt be used without the ecu, not to mention they require upgrading the retainers and springs

Well the ONLY way that JWT will sell you the C-Series cams is with the Titanium valve springs and retainers.

And don't even think about using the C-Series cams with the stock springs and retainers, as the valve train harmonics caused by the C-Series cams will destroy the stock valve train in no time.

sure that valve float will get ya

Actually it's not valve float, but valve train harmonics.
In other words how everything in the valve train vibrates at any given rpm.

I remember Mike Kojima posting once in the SE-R mailing list, about how JWT hired outside consultants to help them design the C-Series valve springs. And that they had worked out the harmonics to the 3rd order(or something like that).

In other words, JWT put a ton of work into designing those cams and valve springs so you could use them without worrying about reliability issues.

tru, but with the different cam characteristics and higher rev limit, 7800 or whatever jwt ecu makes it, valve float is a definite threat to the stock springs/retainers

so would anyone say the s3/s4 cams behave like the vtec switch over in a honda or are they not as aggressive. I know in the type r the cam switch is very aggressive.

so would anyone say the s3/s4 cams behave like the vtec switch over in a honda or are they not as aggressive. I know in the type r the cam switch is very aggressive.
No.
Once you get into the power band, the motor pulls hard to fuel cut.
There's no on/off vtec like feel.

Technically you don't need to upgrade the retainers.

you definately should change both the springs and retainers! The C3 cams have almost 15mm's lift!!! Thats way more than any Tomei or JUN camshaft.

not for s-series cams ***

Like I said before, you can just change the valve springs without changing the retainers.

speaking of jun, i went to their website to check out their ecu's and this is their listing for sr20 engines
which one would work for ours?

SR20 - S13, S14, S15, HP10, RNN14