Yes closed is 130lb on my springs. 135lb on patriot dual springs, and 125lb on single comp 918s

 

Im having the same issue it seems like. My truck made almost 500hp at 5krpms then flat lines. I was told valve float was probally the problem with the prc 650s I was running. I bought some comp 675s and the truck feels exactly the same but it hasnt been on the dyno to varify..

 

sorry that was an old dyno sheet.. I cant find the latest one but the graph is basically the same

 

Yeah yours to me seems better than mine. My power drops literally straight off around 5800. And it's very unstable looking to me all the way up, like it's not very smooth

 

Yea thos .650 springs arent the problem bc they are working like a charm for me.

 

Yeah I found that out the hard way, at least I have some bad *** springs now though, lol..

 

yea no doubt!

 

I would got with dual springs for the added security from dropping a valve if a spring were to break.

 

Yeah i bought lunati double springs. 155lb closed seat pressure. 400lb open seat pressure. Im installing them as we speak. Hopefully this weekend i can give u guys a update on my problem!

 

I would like more info on your new tuner if you could pm me or something. I am in the springfield area. I added a turbo and will need some fine tuning.
Hope you are getting there. Also sounds like I better start saving for better springs.
Thanks
Dave