I have a 04 magnum 330 2X4. My wife has an 03 Trail Boss. I have read alot about changing the primary spring on the Trail Boss to get better performance and have ordered an EPI red and pink primary spring for it. I want to know if these would give me the same inprovements in my Magnum since they have the same engine and i imagine the same cluthes? If not any suggestions?
Thanks,
randall

 

You will get the same results on both the machines.I bet you will like the red better than the pink
it gives you better take off.

 

What is the difference of engagement between red and stock... what about middle and high speeds

 

The red has a bit higher engagment speed and more rpm on top.the pink has a lower engament from stock and a much higher top rpm and gets to the top faster.

 

So the red would be better for bottom end power... will i loose mid and top if i were to decide on this spring

 

You wont loose anything with it just gain over the stock.

 

ftwflh,
I installed the epi red today. I can tell it has a higher engagment rpm and it seems to accelerate much faster. Couldnt tell much about top end speed since only had short strip to test it on. Not sure about rpms either since i have no tach. I am curious about the pink spring though. I believe the red pressures are 35/140 and the pink 0/160. If this is correct shouldnt the red spring reach shift out before the pink since it takes less psi the overcome the 140lbs? Also not sure why higher shift out psi's create higher top rpm's?

Thanks,
Randall

 

The higher the last number the more you motor works to get to the shift point(more power to point)No more trouble than they are to change try both and compare.

 

i understand that with a higher second number the motor will be turning more rpms when it reaches shift out, but just because you have reached shift out doesnt mean the motor has to stop increasing rpms does it? Example: With the red spring(35/140) in lets say the clutch will reach shift out at 5000 rpms. With the pink spring(0/160) lets say the motor will have to turn 6100 rpms to reach shift out. i understand and can rationalize this in my mind, but what will keep the motor from continuing to increase rpms to 6100 with the red spring in the primary? this is what i cant grasp. It would seem to me the if u have enough horsepower to reach shift out the clutch shouldnt affect wot rpms since the final drive gear ratio will be the same no matter what springs u use. The only way I can figure the clutch should affect wot rpms is if the second number for a given spring is so high that the motor doesnt have enough hp to create enough rpms to reach the neccessary poundage to reach shift out. If this isnt correct can u please explain what im missing? sorry for asking so many questions and i appreciate ur help.
Thanks,
Randall

 

If you are over reving your clutch you are waisting power.