i have a 2010 Electra Glide Classic with a 10.5 CR stage 4 103 making 122/121 STD and ive really been kicking around the idea of adding 6-8 psi to it , any ideas on how long the bottom end would hold up with a proper tune up ? how much boost would it take to get to 150 hp ?
i have alot of expierience with superchargers and turbos on cars but none on harleys so any input , comments welcomed....

 

I'm in the same boat. I have little over 10.7-1 in my ultra 103". Was talking to my dyno guy at quicktime motorsports. He races procharged and turbo charged bikes. He told me he actually prefers motors with more compression. Runs cooler and can still get the horsepower you want.

 

The past three months have seen over 4,000 miles on my 124" tubo twin cam.
We lowered the compression to 8.1.1, added an inter-cooler for good measure coupled to an 8# boost spring. Pistons were built by CP, designed for Turbo applications with a thicker dome to take the added boost.
First small issue in 4,000 miles popped up last week, seems that the front head gasket is starting to leak, the heads and cylinders are coming off and headed to Hannan's Machine in Hayward, Ca. to install o-rings for a perfect seal. Then we add a 12# spring for a little more bang for the buck.
Haul *** and Ride for your Life!

 

It can be done I have sold many with 10.5 and installed.
Give me a call if you want to talk about it is easier over the phone. And I will give you the best price on the blower no body can beat my price. Nobody!!!!!!
815-765-1790
Dragos Bike Works.