Timing
I am going to ask the question for clarity: When doing the head shim would you not also do cam timing gears? ie: elongating the bolt holes and clocking the gears? I believe this is a normal procedure when the motor is getting worked on and installing a head shim.
I think that those considering a head shim should get the full answer. It is difficult for those who don't know to invent the question. Just a thought...
BTW, the gems may be ok for those riding the same locations all the time but for alot of us who use our sleds in the mountains and close to sea level coupled with extreme temperature variations it would be more convenient to utilize a better fuel management system. As in one thread, we are sick of being test pilots and wasting money on things that don't quite work. My experience with that particular controller is very negative and frustrating.
I am sure you have perfected it over the years, but for the guy who wants to ride and not learn how to read some code and hope they can guess at a fix to make things better, it stinks. When it works it works awesome, I'll give it that but the times it doesn't you just want to burn your sled and go back to a 2 stroker...
JMO
Cheers :face-icon-small-hap
Good question. I think to answer this question we need to look at a few things:
1-We thought that opening up a top end on a high performance 4 stroke would be a turn off for some. Clearly its not as bad as we thought. <o</o
2-When running a head shim on a supercharged sled it seemed to have a ill effect on the bottom end performance. We didn't like the trade off between more boost and weak bottom end performance. That’s way you run a supercharger. I would rather have the snappy bottom end. But the turbo on the other hand is different. I don't think the head shim affects the bottom end performance (not much to screw up). I like the turbo and I think the trade off is worth it. <o</o
3-2 years ago we didn’t have the ability to re program the stock ECU. Now that we can its easy to pull some timing out without upsetting the bottom end performance but crank in more boost and still run pump. So the ECU is like doing a head shim without opening up the motor.<o</o