good info
Doug briefly talked about extreme cams. There are no really wild cams for the K-Series yet, but there are experimental ones that Hondata checked out. Add lots of timing at low end for impressive torque gains, raise idle speed, reduce overlap in part throttle.
Supercharged engines:
- Tuning is really similar to NA larger motor.
- Supercharged engines love overlap (high cam advance)
- High cam set to 50 degrees throughout most of rev range, then down to 40 from 7000 rpm on up
- Low cam VTC 45-50 degrees
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Cam angle actually affects boost in manifold
- Set maximum closed loop to 110kPa (over that the ECU will ask for open loop).
- The higher the RPM, the higher the boost. (Greddy turbo actually got less boost at higher RPM)
- In the fuel tables, boost curves should be very flat and smooth
- However, more boost does not necessarily mean more power
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Ideal A/F ratio at WOT under full throttle is lower than NA, 11.5-12.5
- Street version of the JRSC had 212-220 whp, went up to around 250 with Hondata.
- Interesting note: They fit a JRSC to a base! Cables on throttle body are reversed on base. They turned the whole thing around. Not sure if it is just a technology demonstration or will become a real product.
- Use variable VTEC window like on stock engine but with two exceptions: you can set the lower boundary lower, down to 3,000, but set both the lower and higher point to occur at full engine load pressure. That way there won‘t be a linear line. Under load it goes into VTEC, under part load it goes out of VTEC once revs fall below the upper boundary.
full web page here :
http://www.pencomputing.com/rsx/HondataSeminar.html