Running a catch can will help keep your fuel at whatever octane you have in the tank. Crankcase vent and PCV recirculate oil mist back into your air effectively reducing your octane.

 

You will be fine if is tune right.

 

Thanks. I plan on rigging up a catch can that is vented to atmosphere through a small filter for the vent line. In addition to preventing the oil mist from lowering the octane rating, it will keep the impeller blades clear and prevent the oil mist from condensing into an undrainable mess in the bottom of the intercooler over time. I plan to leave the PCV line connected as is comes from Honda. The PCV valve only opens when the MAP is less than the pressure inside the valve cover. With the vent line vented to atmosphere, the inside of the valve cover is at atmospheric pressure. When MAP is less than atmospheric pressure, the car is like an NA car at part throttle where the the octane rating is much less critical.

 

Do you have experience with a stock s2000 boosted to this level on 91 octane? If so, were there any issues with it? Anything special you had to be careful about?

 

I was running 16psi on stock motor on 91 turbo never had a problem

 

On E85 sure but 91.... you are definitely asking for trouble. The tuner will have to drop timing so much that.... Junky hit it head on. Its a gamble and you greatly reduce the margin of safety for the motor.

What engine management? Most of the systems are now Flex fuel compatable

 

I have the Kraftwerks kit for an '06 S2000. This kit comes with Flashpro. Flashpro currently does not support flex fuel.

I have made a set of restrictors of various sizes that I can install between the air filter and the blower inlet to reduce maximum boost level if the tuner isn't comfortable with the boost level that the C38-91 compressor provides.

 

I'm turbo charged and I have be running 14-15 psi on the stock motor on straight 91 octane for many many years with over 40,000 turbo charged miles. My stock f20c now has 120,000 miles and makes 450whp at 14-15 psi on straight 91 octane and 617whp on e85 at 20psi. All tuned on a flexfuel setup on aem series 2. But in general I run straigh 91 octane 90% of the time.

A supercharger should be much easier to do this because if your running 15psi you really only have that for a split second at redline instead of someone that is turbines like myself. I hit 15psi at 5,000rpm and it hold 15psi till redline at 9,000rpm

Here is my boost plot. Low line is 14-15 psi on 91 octane. Higher line is e85.

 

Just curious how much 93 octane would help in this matter compared to 91?

 

It's makes quite a difference from what I see. The perplexed on the east cost always seem to boost significantly more and make a good amount more power on there 93 octane compared to our crappy California 91 octane.