richierich14608

Could all you out there with 5.3's equipped with the MP112 magnacharger using a 3.3" pulley give me your boost numbers with mods? Just ordered a 3.3" pulley for my 112 and want to know how much boost I will make.

trever1t

iTrader: (14)

depends on your intake and exhaust. I would expect ~7lbs. on average.

Doobie

iTrader: (2)

I have that exact setup you are inquiring about. With mods in sig and my 3.3" pulley I'm seeing 8~7.8 lbs. of boost. Like Trever1t says, your boost will depend on your intake and exhaust setup. I had 7 lbs. when using the stock 3.4"
pulley. Hope this helps.

TX Tahoe Z71

iTrader: (28)

I have the 3.3" pulley on... but I have no boost gauge so I am of no help to you. But 7-8 psi is the majority opinion from what I have read.

Yellowsierra

iTrader: (7)

Im bought a magnacharger 112 with a 3.3 pulley for my 4.8. I will have it on maybe next weekend. So what ever my boost number is yours will definatly be alittle lower...

exodus

iTrader: (15)

What about the 122HH? would numbers go down because of larger displacement blower, or up due to the rotor difference?

Pooki

iTrader: (9)

Got a mp122 installed with mods in sig and im seeing 8.5 on a 3.2 pulley.

tudd246

I have a 4.8 with the mp112 stock exhaust, running a 3.7 pulley and getting 6.5 to 7 lbs. of boost