Hi,

I've been running the Stillen s/c'er s4 for a while plus most of the go fast mods that I could find but without getting into the internals of the engine. It is time to consider next steup such as: cams, rods, pistons, heads, valves, etc.

I probably should run cams with less overlap to retain more of the a/f charge so which cams are recommended for the s4? Also, what about the rest of the built that can/should be done at the same time with the goal of more [relatively] safe power? So, what do you guys sugest?

TIA for all the help.

 

Talk to Michael over a VRT. They have tried cams with a Stillen before.

From what I have seen it does not help much.

 

The MOST you can get out of the Eaton blower is 340whp period...You can get a higher boost pulley etc. Wa2Good tried a 13lb pulley and it will not make more power.

 

These Stillen SC'ers are great for what they are, a very usable/streetable 320-350ish WHP.
Unfortunately, most things that are added in conjunction with this roots type SC do not help much, if at all, ie; custom made pulleys, cams, ported/polish, methenal injection, headers, exhaust, buil motors, etc. Unfortuneately, with the exception of a couple of these listed additions nothing realy works to add any additional power or torque to speak of with "THIS" M62 eaton type blower. The SC'er is only efficient at 8.5-9 lbs. of boost, with anything higher than that (like a 10-13 lb. pulley) it cavatates and will actually make less power, and alot more heat. .
So, a built motor with this Stillen SC would be a waste of time and money IMO. We have either directly, or indirectly tried almost anything you can think of under the sun to add powere to these SC'ers

Unfortunately with the Strillen SC you got what you got. I actually am a bit partial to the linear power curve and that intoxicating noise of these kits, but trust me, do not waist too much time/money on trying to extract a bunch more power out of this type SC, it is like pissing in the wind, or banging your hear against the wall. TRUSSS me!

 

the reason for this is because the blower is maxed out in efficiency. It's a small blower when considering eatons. The only reason Stillen when with this small of a blower is due to hood clearance, although they should be coming up with a larger eaton style blower setup within a year, but you will need to run their version 2 hood that they have supposedly. Their red 350Z demo car has been using that blower from time to time as they toy with it more and more.

The blower's efficiency is being reached by a stage 4 setup unfortunately, and any more boost you can make with other pulleys and such, have their gains practically negated due to heat soak. a compressor this size cannot push or pressurize more air without super heating it, and as we all know heat robs us of power. I've heard of some Z guys trying to port their blower housing, which might help a little bit, maybe for an extra 10-12hp, not worth the hassle IMO.

I'm always on the angle to find new ways to make power with my stillen s4 setup, and what i've found is this:
run water wetter in the intercooling system, this helps reduce the heat just a bit more, expecially in hot so cal summers.

running the stillen airbox actually helped me reduce temps a tad bit as well. Basically, without changing the blower (which also means changing out the plenum/intercooler setup that the blower actually sits on top of), treat all sources of heat, and try to reduce them.


What mods have you done if you don't mind me asking? have you tried new cats/test pipes, headers, etc...?? what kind of exhuast setup are you going with? I know stillen says that freeing up too much backpressure will actually lower boost levels slightly, but i'm curious as to why these would be detrimental vs beneficial. That's the only thing about this type of kit that I can say i do not understand.... I've read books on SC kits as well, and didn't find an answer. Is it due to the cam timing and overlap etc?

 

Tony, looks like your post is a bit too late. ^^^^ Although for the most part, right on!

 

Dang, that sucks but thanks all for the help. I'll check with Sam@Stillen as a final confirmation and see what he sayz. Overall, city driving and highway cruising isn't bad but she can use more power at the top.