TwoFast

iTrader: (23)

When should I see full boost with my sidemount magnacharger. because it seems that I'm only getting about 2psi around 2500-3000rpm. gmc2 is having the same problem. I only mashed the throttle about half way and I see about 2 psi around 2500-3000rpm. I raced a guy earlier today in a red 70's ford f150 truck (with mods unknown), and I killed him. I had so much adrenaline pumping that I didn't even pay any attention to how much boost I'm was Although, shouldn't I see full boost instantly when I mash the throttle all the way down.

ogkevin13

no u will get full boost only at peak rpm. the more rpm the more boost thats how pully drivin chargers work

quicksilverado

iTrader: (8)

That is the case with a centrifical s/c. With the roots you should be at full boost by 2k or close to it.

Gmc²

iTrader: (1)

true dat, w roots you see your torque and your boost almost instantainiously,

TwoFast

iTrader: (23)

so is there any reason why I'm only seeing 2psi? Should I just get a 3.00" pulley from pulleyboys.com, maybe that will get me 5psi??? What do you guys think??

PappyDan

iTrader: (4)

i thought the side mount system was a 5 psi set up?

TwoFast

iTrader: (23)

well for some reason the blower is only making 2psi, just like gmc2's truck is. Could it be due to the headers and free flowing exhaust because I thought a free flowing exhaust can make you loose some boost..

GMC_DUDE

5.3, before going to a smaller pulley, I would look for something wrong in the setup. I'm not familiar with the sidemount units, but some things to look for are:

Air Leaks: Check around the manifold. Squirt some oil around the various joints and fittings and see if it gets sucked in, or if it changes how the engine idles.

Misplumbing: Make sure all the hoses and pipes go where they should. Try to figure out if there is a "vacuum" hose somewhere that may be bleeding off all your boost.

Miller Time: Are you perchance running a cam with a lot of overlap, in which case your "boost" is just blowing everything through the cylinder and out the exhaust pipe?

Just a few ideas off the top of my head, but you get the idea. Do some creative detective work to ensure everything is OK before jumping to a smaller pulley.

p.s. You beat me to it, but yes afree flowing exhaust can cause a drop in boost, although it would not necessarily be a bad thing.