When you're inlet temps go up, your timing has to go down.
So, other than just the thinner, less hp producing air, going into your engine, it is also retarding timing to combat against detonation.
When the block/head get hot, with a roots blower bolted to it, the inlet temps go up further.
A larger more efficient rad, a slightly lower t-stat and some decent electric fanS(not single) to keep the motor happy is a nice addition.
You don't have to worry about deto if you have your tune setup to decrease timing with inlet temps(which is only possible with your IAT in your mani).
Water/Meth is the best way to combat this. Or, if you are daily driving/drag kind of guy, just throw a bit of N2O on top when ya want to get onto the gas a bit
- Drew