Mangled03gmc

iTrader: (95)

I will soon be adding a blower to my current set up, also a IC with it. My ?? is I have a lq4 with the stock head gaskets, but my heads(317) are milled 20k. So what is a safe amount of boost to run. Also I am running a cam that is kinda a N/a cam, due to it being on a 112lsa, but don't want to change it, kinda want the lope aswell. So with that cam bleeding off some boost, where or what pulley can I run and be on the safe side still. Also I might spray a 75 shot now and then, prob more then then, since the FI will be on... I know you guys have been threw this, about the perfect scr but I need to know what comp i am at and how many lbs I can run. So anybody that can give me some help, kinda give me an idea will be great, of course my tuner and me will run threw it also, just need your guys exp on this aswell..

Thanks John

trever1t

iTrader: (14)

John,
What blower?
Either way, define safe?
How's 10 sound?

Obviously your cam isn't the best match for a blower, why not swap? Boost > Lope. You can always trade off those heads for a fresh set too. Just a thought.

2005 Silverado

iTrader: (19)

P1SC prochrager, also i would say depending on the compression ratio (stock is 9.5:1 if i remember right, so -20k is going to raise it a bit, most likely closer to 10:1 if not more) with the milled heads i would start at 5 and see what happens. How much for the nitrous kit that you really dont need now?

Dustin

Mangled03gmc

iTrader: (95)

I am keeping it on at this point, i took alot alot of time to hook it all up neat, I mean neat, everything is hidden, was trying for the sleeper look, now that a freaking blower is there, should have kept it all exposed, but who would have thought i would find a blower and go for it.. You will be the first to know if i unlode it hows that..



Trev. It is a P1sc procharger. Safe meaning not blowing things apart. Heads an cam are out of the ?? at this point, I have way to much in it to fast now, am about broke. Know what I mean??

John

trever1t

iTrader: (14)

Yes, I certainly do. Well like Dustin says, start with 5-6lbs. and work from there. http://www.c5frc.com/calculators/Com...Calculator.htm

Hawk179

iTrader: (1)

Non positive blower versus positive blower. One likes compression, one does not. You have the one that does not like compression. But, your type of blower will favor your current cam more than a posi blower(maggie) would. So run it, but run it safe. You can add boost, about 8-10psi, but not much timing. Hope this helps.

R

Mangled03gmc

iTrader: (95)

Yes that helps, I just wanted a good idea on it.

This is what I cam up with. The stock heads(317) are 72 cc chambers(correct), 4in bore with 3.622 stroke.Stock gaskets are 55k, take away the 20k of the mill job I had done on the heads, using the 4cc dish(correct) the pistons have(LQ4), got 9.8-1 comp ratio. So if that is all correct, I could run the 10lb pulley on it, considering the cam(112lsa) will bleed off a slight amount of boost, I would be in the neighbor hood of about 8psi.. So like you said back off the timing a tad.. That is if I came up with the right info...

John

2005 Silverado

iTrader: (19)

Okay sweet, we'll see how i feel after the cam haha

Dustin

Mangled03gmc

iTrader: (95)

You will want more trust me.. I havn't even had the dog tuned yet with the squeeze or rear or trans or stall, already bought the blower, so it is never enough.. haha

John

stock48

iTrader: (16)

There is nothing wrong with a 112* lobe center with a supercharger, if you were running a turbo I would go wider. I just made 700FWHP with a Gen 1 383, 7.8: cr, 224/236@ .050'', 112*. That was with an old marine 2.2L non I/C, Whipple charger @9.5psi I know that's not earth shattering, but I think it is decent for a 9psi, non I/C, 91 octane @6500' elevation.