Plugging Exhaust Valve Help

[edgexcsp]

I know one of the "fixes" posted on here had a dyno sheet that showed valves opening around 4500rpm. I think it's safe to say they were plugged as well.

I was finally able to do some messing around with the auto tune last week. Just 10 minutes of riding and you can see some big changes in the range of 4500-5500 rpm. Almost 20%. Obviously where the valves are opening. I also chose to enable the accelerator pump feature as this seemed to work well with the SLP map. I think it can better accommodate the quick opening of the valves.

This is a big change from them opening at 6800-7200 rpm. Not only are you now dealing with a larger port height, but you are also dealing with instantanious response from the valves themselves. It is pretty easy to see that for some sleds the stock mapping may not be able to compensate for this.

This early opening of the valves is what I believe was killing my sled once the April flash was installed. Even with the accelerator pump active my sled would just bog until and rev slowly. It acted just like a "big port" motor, great top end but no bottom. Unplug the valves and everything is fine.

I am not crazy about keeping extra heat in the motor but it just would not run any other way.

 

[switchy]

I have 07 600 carb with slp goodies and my finding was with them plugged it would pull harder on a good long hard pull. If i wanted to play in the pow and was on and off the gas it would load up or something and rev up slow. Switch it back to stock and good to rip again. I have switch back and forth several times and with my riding style it does not work for me. Not convince the solenoid only has one set rpm to open or is there some exhaust pressure or TPS in the equation. Just my findings and thoughts will leave them hooked up.