I am looking at getting JWT cams for my DET (mostly stock). I know that the S3's and S4's (I don't want to get valve-springs) both give good gains, and that one is higher end vs. lower end. However, does one give more gains, or does one give high-end power and decrease exisitng low end-power? Let me know what you guys think, I know there's a lot of debate on which to get. Oh, and I will be getting cam gears also.

It's said that the lift and duration of S3s are better suited to turbo applications than S4s. C-series cams are also said to be nice, but probably take more tuning. I'd just get the S3s and some adjustable sprockets. You can tune for spool or you can tune for power, but I thought I've read that straight-up they've been good for 30-40 WHP on a mostly-plain T25 application.

Somebody step in if I'm out of line...

Ok, from what I understand, the S3's will give more low end than top end, right? If I go with the S3's, will they still keep the power from falling off at high RPM's, or will I need S4's to do that?

That's contrary to what I've read and heard. Whereas a T25 is really good at spooling on it's own, it tends to whimper out on top. Adding S3s makes the power keep going up and up and up. Again, I don't have direct experience, so don't take this for Canon, that's just what I've read.

The S4's are too big for a T25 setup. You need a really efficient turbo to run S4's

...so you're saying that a T25 is a bottleneck on a car with S4s? I've also seen good (if not very good) anecdotal results with S4s and GTi-R T28s, but I simply assumed we're talking about T25s. Are we on the same sheet of music?

i have s4 cams on my bb motor
cams start pulling at 4200 all the way to
redline.i have had car dynod powerband stays
flat at 5800 rpm to 7500 rpm.doesnt fall off
i personly like the s4 with the t25 .
i produced 215whp at stock boost

what the hell do i know, I'm just a post whore, but that T25 is dang small and it would produce tons of backpressure if asked to pump out big HP numbers. It may make good power but that backpressure is making lots of heat and will be killer on the turbo, as well as tough on the motor. If I had a T25 I would probably upgrade to GTi-R before I went looking for big hp numbers. Make sure you have a 3 inch exhaust and at least a 2.5 inch downpipe with a free flow cat.

Originally posted by turbo93
i produced 215whp at stock boost HOLY CRAP. I'm not calling you a liar, but I want pictures! Did you do a baseline, or just with the S4s? You're telling us you had no external boost controller when this pull was made? What kind of shape was your car in otherwise (downpipe, cat, exhaust, etc.)?

FastNX please do not reply to this thread if even you admit you are just a post whore. S4's work great with T25's and T28's. S3's work great as well. As for which will work better, I am not sure, but I know for sure BOTH work great. I personally have C1 cams on my car. I ran a 13.3@104 at 8 psi with a spun slick(slick spun completely off the wheel). I guess since big cams work shitty with this turbo, I would have run 11's if I had S3's. :rolleyes:

slick spun completely off the wheel

terrin means that it spun completely on the wheel, as in made at least a full revolution independant of the wheel, causing the valve stem to rip out, and all the air came out, which then caused the tire to fall off the bead

right terrin? :D

yah, what he said.

yes no boost controler
215.7 whp a 6000 rpm
197.3 torque a 5000
i hade full exh/3 inchcat /pullies/cams/centerfore clutch/
motor mounts.stock boost had a fan blowing on the top
mount.i did 5 pulls nothing below 212 whp .
if i knew how to put dyno pic online i would

I believe those numbers...with a t25

I made 222.1 whp and 219.7 lbs/tq @ stock boost

I even did these baseline runs with a 2.5" exhuast with a cat, a seized up ac compressor, and a jwt clutch, this was with 370cc inj and stock maf. The Air fuel ratio was in perspective too. Who knows with a full 3" exhuast no cat, and no ac compressor I believe I would of hit 225 whp and even as high as 230 whp @ stock boost..

I have my dyno sheets and members from the forum were there at dyno day for proof...

Believe man...
Oh yeah I have the S2's packed in the head similar to the S3's

peace bro

question from me??? so if you guys had a t3/t04e turbo, with 3" downpipe and 3" exhaust, internals done, which shaft would you guys pick??? i'm looking to get rid of my JG turbo camshafts...

Can't go wrong with the S3s. They idle pretty nicely, even. Though if they don't idle as well as stock, JWT can fix that, too. 30 HP sounds like fun to me...tack on an O2Induction manifold one day and up you go. ;)

C1's. :)

So do you guys recommend cams for a t-28 :confused: If so, which ones S3 or S4?

id like to recommend one but someone may rip my head off if i do

After doing some research I eas able to answer my own question:D

T25, T28, and T3 = S3 cams
T3/T04 = S4

Simply put - "big cams" need big turbos.