OD Cog questions - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

JHall651 · 12-17-2013, 10:16 PM

I am thinking about having an OD Cog installed but I have a few questions. I understand the whole 1:1 ratio Cog but what would be the next step up in size and where will it put my boost at on my Magna? I've been told the next size up would be approx. 25% increase in boost. Seeing is how I'm somewhere around 7 psi on stock Magna setup (can someone confirm this) isn't that going to put me at almost 9 psi? With that being said I have read that 10 psi is a bit high for a stock Cam on 93 pump gas. I always like to stay safe and conservative as this is my DD. Is it recommended to add a smaller pulley up front when running off a stock bottom and cam? If so what pulley should I go with up front? Or, will I be fine with just the rear OD Cog plus the ID850's, ZL1 fuel pump, ADM fuel controller, 2" headers and CAI I will also be having installed at the same time? Thanks for the help guys and gals.

JLE58 · 12-17-2013, 11:44 PM

Would more than likely be closer to 11 psi.

jrpxxii · 12-17-2013, 11:48 PM

I would go with the OD and if you are concerned about too much boost, pulley off the front to drop boost

jrpxxii · 12-17-2013, 11:53 PM

Your going to lose 1-2psi with headers as well

jvoisel · 12-17-2013, 11:59 PM

Maggie on stock 3.8 pulley I made 7.6 psi
Added headers and it dropped to 7.0 psi
Added OD cogs and I make around 11psi depending on weather.

I have the blower with stock 3.8 front pulley, OD cog rear, headers, and an adm cai. The day we dynod it, it was around 75deg and made 550/565 and peaked right around 10.7psi. The other night it was around 35deg and I saw 11.3 psi, letting off at ~5700.

I'm running stock internals(only mods listed above) on pump gas with Siemens deka 63# injectors, zl1 pump, and adm FPCM getting plenty of fuel

MS7 · 12-18-2013, 12:31 AM

Quote:

Originally Posted by jrpxxii

I would go with the OD and if you are concerned about too much boost, pulley off the front to drop boost

in my opinion
save $ & get 3.6 it will add 1 or 2 of boost.
i installed the (OD). my boost jump from 6 to almost 11 and cost me alot of troubles.after that installed front pulley 4.1 to drop my boost to 7

JHall651 · 12-18-2013, 12:43 AM

Wow. See that is my concern. I really don't want to go higher than 9 maybe 10 psi at the very very max. Everything I have seen on here people running straight rear OD Cog are pushing 11. Kind of turning me off the idea of OD Cog. Only thing I'm concerned with playing with front pulleys is belt slippage. If I go with the front 3.6 pulley do I have to get different belt and better tensioner?

dan0617 · 12-18-2013, 09:33 AM

You have the fuel mods, headers and CAI. Go with the OD rear cog. If you have too much boost go a little bigger on the front pulley.

H-E · 12-18-2013, 11:33 AM

If I was spending the money on cogs I would do the od and go with a bigger front pulley for belt wrap.

12-17-2013, 10:16 PM	#1
JHall651 Drives: 2012 Camaro 2SS LS3 Ashen Grey Join Date: Mar 2012 Location: Chicago, IL Posts: 478	OD Cog questions I am thinking about having an OD Cog installed but I have a few questions. I understand the whole 1:1 ratio Cog but what would be the next step up in size and where will it put my boost at on my Magna? I've been told the next size up would be approx. 25% increase in boost. Seeing is how I'm somewhere around 7 psi on stock Magna setup (can someone confirm this) isn't that going to put me at almost 9 psi? With that being said I have read that 10 psi is a bit high for a stock Cam on 93 pump gas. I always like to stay safe and conservative as this is my DD. Is it recommended to add a smaller pulley up front when running off a stock bottom and cam? If so what pulley should I go with up front? Or, will I be fine with just the rear OD Cog plus the ID850's, ZL1 fuel pump, ADM fuel controller, 2" headers and CAI I will also be having installed at the same time? Thanks for the help guys and gals. __________________ 2012 2SS/RS, Magna TVS2300, RX Catch Can, Borla S-Type, Pfadt Stage 4 w/ ZL Spec Sway Bars, ADM Custom Boost/AFR Gauges, Hurst Short Throw, Forgestar F14 Matte Black 20x11 & 20x9.5 Deep Concave all 4, Nitto Invo 315/35 & 275/40, Heritage Grill, Sparks Black Grill SS & Trunk SS, P13W Fog Lights (cool white) w/ DRL Harness, Blacked Out Brake light bezels, Xpel Smoke Light Kit

12-17-2013, 11:48 PM	#3
jrpxxii Drives: 2010 Camaro SS/RS 427ci Join Date: Jul 2009 Location: Bowling Green, Ky Posts: 3,355	I would go with the OD and if you are concerned about too much boost, pulley off the front to drop boost __________________

12-17-2013, 11:53 PM	#4
jrpxxii Drives: 2010 Camaro SS/RS 427ci Join Date: Jul 2009 Location: Bowling Green, Ky Posts: 3,355	Your going to lose 1-2psi with headers as well __________________

12-17-2013, 11:59 PM	#5
jvoisel Drives: 2010 2SS/RS M6 Join Date: Aug 2013 Location: New Orleans, La Posts: 436	Maggie on stock 3.8 pulley I made 7.6 psi Added headers and it dropped to 7.0 psi Added OD cogs and I make around 11psi depending on weather. I have the blower with stock 3.8 front pulley, OD cog rear, headers, and an adm cai. The day we dynod it, it was around 75deg and made 550/565 and peaked right around 10.7psi. The other night it was around 35deg and I saw 11.3 psi, letting off at ~5700. I'm running stock internals(only mods listed above) on pump gas with Siemens deka 63# injectors, zl1 pump, and adm FPCM getting plenty of fuel __________________ 2010 2SS/RS

12-18-2013, 12:43 AM	#7
JHall651 Drives: 2012 Camaro 2SS LS3 Ashen Grey Join Date: Mar 2012 Location: Chicago, IL Posts: 478	OD Cog questions Wow. See that is my concern. I really don't want to go higher than 9 maybe 10 psi at the very very max. Everything I have seen on here people running straight rear OD Cog are pushing 11. Kind of turning me off the idea of OD Cog. Only thing I'm concerned with playing with front pulleys is belt slippage. If I go with the front 3.6 pulley do I have to get different belt and better tensioner? __________________ 2012 2SS/RS, Magna TVS2300, RX Catch Can, Borla S-Type, Pfadt Stage 4 w/ ZL Spec Sway Bars, ADM Custom Boost/AFR Gauges, Hurst Short Throw, Forgestar F14 Matte Black 20x11 & 20x9.5 Deep Concave all 4, Nitto Invo 315/35 & 275/40, Heritage Grill, Sparks Black Grill SS & Trunk SS, P13W Fog Lights (cool white) w/ DRL Harness, Blacked Out Brake light bezels, Xpel Smoke Light Kit

12-17-2013, 11:44 PM	#2
JLE58 Drives: CGM,twin turbo, cam 2010 SS/RS Join Date: Mar 2011 Location: ROCKMART, GA Posts: 2,185	Would more than likely be closer to 11 psi.

12-18-2013, 09:33 AM	#8
dan0617 Drives: 2011 Inferno Orange SS Convertible Join Date: Apr 2012 Location: Tyrone, PA Posts: 640 View My Garage	You have the fuel mods, headers and CAI. Go with the OD rear cog. If you have too much boost go a little bigger on the front pulley. __________________ 2011 SS IOM Vert. ECS Vortech 13+ psi, Water/Meth, ID850’s, ZL1 pump with MSD Voltage Booster, 2800 stall, LT headers, Drag radials, Drag alignment, Cradle Bushings. A million other supporting mods. Tuned by Ted.

12-18-2013, 11:33 AM	#9
H-E Account Suspended Drives: 2010 zr1 Camaro 2011 vert Join Date: Apr 2013 Location: everywhere Posts: 1,121	If I was spending the money on cogs I would do the od and go with a bigger front pulley for belt wrap.