I was thinking of things I wanted to do to the S in a year or so. And I wanted to get cams, but was wondering what is the added benefit of them? And, if anyone on the forums has done this mod with a turbo S?

 

Nobody uses aftermarket cams in here...

 

 

Do most of the turbocharged s2k's do the modification of installing the exhaust cam from the ap2 motors or just completely stock motor?

 

Tuning your factory cam timing with cam gears will add more than any aftermarket cam to date.

 

I dont know if they would make any power... I want to say someone tried a set of Crower cams (Forced Induction designed, apparently) a few years back, and actually lost power...

Most people will just port the head, bowl the valve runners/chambers, and install a slightly oversized exhaust valve (+1mm or so). This is what PortFlow recommends, I believe, and they do the head work for Laskey Racing...

John

 

Thanks for the heads-up guys.

Now, what are the better cam-gears out there?

 

The only cam gears are Toda.

 

I got Toda cams.

Before I went FI they were giving me a 15-20bhp gain.

 

Cams have been successfully designed and utilized for turbo S2000s; they just haven't been paraded around the forum.

The problem with S2000s cams is their long duration and high overlap, which is ideal for an NA setup but not so great for turbochargers, especially smaller setups which causes a large amount of exhaust reversion. Turbo cams usually have low duration and limited overlap.

When I say its a problem, it's usually in the case of smaller turbos which most people here do not run. If you are running a Greddy kit, Gt28, or even GT3071, that's when you would see measurable amounts of exhaust reversion (basically the exhaust gases returning into the cylinder mixing with charge air during overlap when both intake and exhaust valves are open). This problem is exacerbated by log manifolds, internal wastegates, etc. You can avoid the problem, to a degree, by using more efficient manifolds which most here do.

The short answer: you likely don't need them. However, it is false to say they haven't been used successfully in turbo applications.