A friend has been telling me that some folks are using motorcycle valve springs from a "R" high-rev street bike and that a S2K is capable of rev's to 11K with this and a few other minor mods. Is this non-sense or has anyone heard the same?

 

The S2000 supposedly is capable of 11k stock, but for longterm reliable reasons, Honda pushed it back to 9k.

 

Since this is past peak power wouldnt it be inefficient?

 

Not necessarily. When you upshift, you go to a power below peak since you are now well below peak rpm. So best shift point is where upshifting results in more power than staying in the current gear. In the S2000, and virtually every car, you hit the redline before the optimal shift point in the lower gears. You'd need much more close ratios for this to not be the case. But not sure where 11krpm would put you. Perhaps much too low in power such that it is no longer useful. Though I could imagine that it may make sense sometimes, say on the track where you'd have to momentarilly up and then quickly downshift on a curve.

 

How do you deal w/ the rev limiter? Only way I've heard of is w/ the AEM PEMS.

Anybody have any ideas?

 

well, if the engine was redlining at 11krpm, the fuel map, air/fuel, timing, etc. would thus be retuned to accommodate the wider rpm range; surely, peak power would not still be at a mere 8300rpm.

 

More of a question of cam duration and lift. The engine will only flow so much (efficiently) with a given set of cams. Unless you had a custom grind to take advantage of the extra RPM the extra RPMs are kind of wasted.

 

Honda was thinking about a 3 stage vtec at one point because the variation in 2 stage is nearing it's limits

 

The Honda Sports 800 (launched in 1965) is Honda's highest revving road car to date. It produced 70hp from a 791cc engine and the red-line was at 11,000rpm.

 

I know VTEC engines are designed to shift at higher RPMs, but I find myself staying very low when I shift <5000. Is this bad for the car? What are the gas milage ramifications of shifting early or late (say 6-7,000 rpms).

What are the ideal shifting RPM ranges for gas?

Don't flame me with the "its a sports car, drive it like one" stuff. I am just curious.

Paul