Car makes 11 lbs boost??? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Jason P · 05-20-2013, 03:17 PM

No dyno yet haven't had time. Just going off gauge. (aem)

Mchlgrrsn · 05-20-2013, 04:49 PM

Quote:

Originally Posted by Jason P

No dyno yet haven't had time. Just going off gauge. (aem)

You probably have a smaller pulley up front.

fourmz · 05-20-2013, 05:12 PM

I too installed the OD cog kit last year and went from 8# to 11.5-12#.

old motorhead · 05-20-2013, 05:43 PM

If you have the 3.8" front pulley, it's like having a 3.25 front if you had direct drive (1:1) on the rear. 11psi is about right. Don't fall in to the trap of thinking you need a "blower" cam. If you're good with the manners and fuel eco, there's no reason to change it. I'm guessing you don't have any low power problems on the bottom end. Full boost available at anything over 2500 rpm kinda cures that

That's enough cam that it must absolutely scream up top. Enjoy it and don't worry about a cam swap.

Kronix · 05-20-2013, 06:35 PM

OD Cog drive is worth 3.5 lbs of boost. Stock 3.8 Pulley with the Maggie in 6lbs of boost. 3.6 Pulley adds another 3lbs or so of boost. I run 12-12.5 lbs of boost, with Meth as safety.

old motorhead · 05-20-2013, 07:06 PM

Quote:

Originally Posted by Kronix

OD Cog drive is worth 3.5 lbs of boost. Stock 3.8 Pulley with the Maggie in 6lbs of boost. 3.6 Pulley adds another 3lbs or so of boost. I run 12-12.5 lbs of boost, with Meth as safety.

The O/D rears spin the blower roughly 17% faster than the 1:1 rears. At mild boost levels, the boost will increase around 17% with the O/D rear pulleys vs the 1:1 set. As boost goes up, that % increase goes up too. If you spin the blower faster, pushing more air through the same motor, boost (restriction in this case) will go up. Just because the boost goes up doesn't mean the power will go up at a similar increase. At very high boost levels, adding more boost does little more than heat the air.

That's where bigger cams, ported heads, better exhaust, and anything else that adds to the air flow through the motor helps make more power.

Kronix · 05-20-2013, 07:17 PM

Quote:

Originally Posted by old motorhead

The O/D rears spin the blower roughly 17% faster than the 1:1 rears. At mild boost levels, the boost will increase around 17% with the O/D rear pulleys vs the 1:1 set. As boost goes up, that % increase goes up too. If you spin the blower faster, pushing more air through the same motor, boost (restriction in this case) will go up. Just because the boost goes up doesn't mean the power will go up at a similar increase. At very high boost levels, adding more boost does little more than heat the air.

That's where bigger cams, ported heads, better exhaust, and anything else that adds to the air flow through the motor helps make more power.

And that's exactly what I did, adding my custom grind Comp Cam was one of the best mods I've done

old motorhead · 05-20-2013, 07:58 PM

Quote:

Originally Posted by Kronix

And that's exactly what I did, adding my custom grind Comp Cam was one of the best mods I've done

It's just bad a$$ed when you get it right. Nice sound, stock like MPG, and stupid power when it's all said and done. You guys are spoiled just rotten. Looks sweet, runs supercar fast, doesn't cost supercar money, and your wifes/significant others like it too

Kronix · 05-20-2013, 08:21 PM

Quote:

Originally Posted by old motorhead

It's just bad a$$ed when you get it right. Nice sound, stock like MPG, and stupid power when it's all said and done. You guys are spoiled just rotten. Looks sweet, runs supercar fast, doesn't cost supercar money, and your wifes/significant others like it too

Well, you almost nailed it! My wife HATES getting in the beast

But that's fine with me!

Jason P · 05-20-2013, 11:37 PM

Thanks for the replies. I need to get it on a dyno and see where I'm at. Its all been pieced together from lurking on this forum.

Slickcas · 05-21-2013, 03:39 AM

On a stock motor any thing more then 10 psi boost is asking for bad things to happen. With my little V3 with a 3.33 pulley I was at 11.5 psi and 618rwhp. I picked up a 3.47 pulley to get the boost down to 10 or so. As long as you are not running the car to hard you should be fine.

ITGuy11 · 05-21-2013, 07:28 AM

I run the OD cog and stock 3.8 pulley up front on my Maggie. I also have the JRE blower cam, and Kooks headers no cats. Currently making 9.6 psi peak boost. I would like to reduce boost by about 1 psi as I am on the edge with my fuel system and I can't hook up the power on the street anyway...

ayousef · 05-22-2013, 03:50 PM

dont stress on how much boost you're making. If its too much for your taste get a larger blower pulley, but on the 11psi range and a stock motor (guessing) Youd better be running meth or a really good tune (yet i havent calculated dynamic compression ratio with your cam) Just make sure you have enough fuel pressure and stable WOT AFR and timing (no knock) and you should be good.

That cam you have will seem to make good top-end, which is a good combination with a PD blower since you already make awesome low-end.

Nitroman28 · 05-22-2013, 07:40 PM

I'm have a 223/235 .610/.620 115. Ported heads, OD Cog and stock front pulley and I'm at 10.5 psi.

05-20-2013, 03:17 PM	#15
Jason P Drives: 2011 2ss Join Date: Oct 2012 Location: United States Posts: 272	No dyno yet haven't had time. Just going off gauge. (aem) __________________ 2011 2ss Ram twin plate ceramic clutch, Texas speed 418 LS3 235 /243 .621 / .624 cam, ported and polished heads with dual springs,magnum push rods, Hotchkis race pack, Stainless Power long tube headers with no cats, Magna Flo competition exhaust, lpe fuel pump, magnuson supercharger with overdrive and port matched blower plate, IW 8 rib pullies, AEM meth kit, id 850 injectors, 3 bar map, halltech cai, zl1 rear diff

05-20-2013, 05:12 PM	#17
fourmz Fourmz Drives: 2010 2SS/RS 1968 Firebird 1994 Z28 Join Date: Sep 2009 Location: Soldotna,Alaska Posts: 382	I too installed the OD cog kit last year and went from 8# to 11.5-12#. __________________ Black-in-Black/Blue out 2010 2SS/RS LS-3 -Magnacharger TVS2300,OD cog belt drive, 3.4" pulley, Janetty smooth idle blower cam,ID-850 injectors,ZL1 fuel pump,MSD boost a pump, ADM FPCM Janetty custom tune,Doug Thorley long tube headers, Corsa catback,C.A.I. Intake, Roto-Fab Big Gulp Scoop, Monster LT1/SC Clutch assembly,Eibach pro kit plus, BMR cradle/diff bushings, Barton Shifter,JRE 3.91 Eaton Tru-Trac rear diff,Barton Short Throw SHifter, Boss 339 20" wheels,Painted heritage grille, Sparks Restoration Inverted blue/black SS emblems, Seibon BB carbon fiber hood, ZL1 front bumper conversion.

05-20-2013, 06:35 PM	#19
Kronix NJ/SoCal HT5 COTW 3/25/12 Drives: 2015 Z06/14 C7/08 Z06/07 Tahoe Z71 Join Date: Nov 2011 Location: South Jersey & SoCal Posts: 1,961 View My Garage	OD Cog drive is worth 3.5 lbs of boost. Stock 3.8 Pulley with the Maggie in 6lbs of boost. 3.6 Pulley adds another 3lbs or so of boost. I run 12-12.5 lbs of boost, with Meth as safety. __________________ Built by Late Model Racecraft Fastest C7 in Tri-State 10.13 @ 134mph 7/26/14 Corvette Challenge Raceway Park, E-Town, NJ

05-20-2013, 11:37 PM	#24
Jason P Drives: 2011 2ss Join Date: Oct 2012 Location: United States Posts: 272	Thanks for the replies. I need to get it on a dyno and see where I'm at. Its all been pieced together from lurking on this forum. __________________ 2011 2ss Ram twin plate ceramic clutch, Texas speed 418 LS3 235 /243 .621 / .624 cam, ported and polished heads with dual springs,magnum push rods, Hotchkis race pack, Stainless Power long tube headers with no cats, Magna Flo competition exhaust, lpe fuel pump, magnuson supercharger with overdrive and port matched blower plate, IW 8 rib pullies, AEM meth kit, id 850 injectors, 3 bar map, halltech cai, zl1 rear diff

05-22-2013, 03:50 PM	#27
ayousef Drives: 2013 ZL1 Join Date: Oct 2012 Location: Dubai Posts: 757	dont stress on how much boost you're making. If its too much for your taste get a larger blower pulley, but on the 11psi range and a stock motor (guessing) Youd better be running meth or a really good tune (yet i havent calculated dynamic compression ratio with your cam) Just make sure you have enough fuel pressure and stable WOT AFR and timing (no knock) and you should be good. That cam you have will seem to make good top-end, which is a good combination with a PD blower since you already make awesome low-end. __________________ 1150bhp Whipple 4.0 Supercharged 427ci Camaro ZL1

05-20-2013, 05:43 PM	#18
old motorhead Drives: Maggie blown LS3 vette Join Date: Aug 2009 Location: SE TX Posts: 1,490	If you have the 3.8" front pulley, it's like having a 3.25 front if you had direct drive (1:1) on the rear. 11psi is about right. Don't fall in to the trap of thinking you need a "blower" cam. If you're good with the manners and fuel eco, there's no reason to change it. I'm guessing you don't have any low power problems on the bottom end. Full boost available at anything over 2500 rpm kinda cures that That's enough cam that it must absolutely scream up top. Enjoy it and don't worry about a cam swap.

05-21-2013, 03:39 AM	#25
Slickcas Drives: 12' 2SS/RS LS3 IBM Join Date: Nov 2011 Location: Odin. ILL Posts: 487 View My Garage	On a stock motor any thing more then 10 psi boost is asking for bad things to happen. With my little V3 with a 3.33 pulley I was at 11.5 psi and 618rwhp. I picked up a 3.47 pulley to get the boost down to 10 or so. As long as you are not running the car to hard you should be fine.

05-21-2013, 07:28 AM	#26
ITGuy11 Burning up tires Drives: 2023 ZL1 Vert Join Date: Jul 2010 Location: Macomb Twp, MI Posts: 717	I run the OD cog and stock 3.8 pulley up front on my Maggie. I also have the JRE blower cam, and Kooks headers no cats. Currently making 9.6 psi peak boost. I would like to reduce boost by about 1 psi as I am on the edge with my fuel system and I can't hook up the power on the street anyway...

05-22-2013, 07:40 PM	#28
Nitroman28 Drives: 2010 Camaro SS 416/4L80 Join Date: Oct 2010 Location: Arkansas Posts: 1,834 View My Garage	I'm have a 223/235 .610/.620 115. Ported heads, OD Cog and stock front pulley and I'm at 10.5 psi.