Check out this thread: https://www.evolutionm.net/forums/sh...ht=cams+vacuum

Also, I'm custom tuned from Dynoflash, but I also have a Greddy boost controller. My boost peaks at 21 and holds rock steady at 20.5 all the way out.

 

Yes, young Skywalker... different in all gears the boost is.

 

thanks for the input guys. my idle is well within range 16. i will add a mbc over the weekend and see that helps. i still cant figure the boost fluctuation from 20 to 16 then to 18.

 

I'm pretty sure my Hallman MBC is messed up, so I'm replacing ALL of my vacuum lines with Silicone hosing and getting a Greddy Profec B-Spec II...that should take care of it! As for the idle, I'm runnning 264's and the vacuum is at 20 something.

 

thats just it i dont have a mbc, just a custom tune flash