9 PSI w/ 2" Headers??? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

JHall651 · 02-09-2014, 11:17 PM

What would be the BEST / Reliable (not necessarily most cost effective) way to achieve a solid 9 psi with 2" headers using a Maggie 2300? (i.e. Rear OD/Front UD Combo?)

grocerygetter · 02-09-2014, 11:22 PM

Proper pulley choice?

JHall651 · 02-09-2014, 11:25 PM

Quote:

Originally Posted by grocerygetter

Proper pulley choice?

Huh? Are you asking me?

2SS45th · 02-09-2014, 11:49 PM

Rear OD is the way to go. If you want to go past roughly 15 you'll need to go to a front overdrive kit as well.

JHall651 · 02-10-2014, 03:19 PM

Quote:

Originally Posted by 2SS45th

Rear OD is the way to go. If you want to go past roughly 15 you'll need to go to a front overdrive kit as well.

15! No I'm trying to find out the best way to only gain like 2 more PSI after installing 2" headers. I want to be at 9 PSI, maybe 10 during a spike but no higher. I really like the cogs but again I don't want to go to higher than 9-10 PSI. So was curious if the 2" header w/ OD Cog will put me at 9 or would I also need to add front UD Pulley. If so what PSI would that combo (2" headers/rear od & front ud) put me at? Thanks for the help guys.

jvoisel · 02-10-2014, 03:29 PM

Quote:

Originally Posted by JHall651

15! No I'm trying to find out the best way to only gain like 2 more PSI after installing 2" headers. I want to be at 9 PSI, maybe 10 during a spike but no higher. I really like the cogs but again I don't want to go to higher than 9-10 PSI. So was curious if the 2" header w/ OD Cog will put me at 9 or would I also need to add front UD Pulley. If so what PSI would that combo (2" headers/rear od & front ud) put me at? Thanks for the help guys.

I have:
Stock 3.8" front pulley
OD rear cog
XS Power 2" headers
ADM CAI
Made just over 10psi on the dyno and 550rwhp/565rwtq on a conservative tune

JHall651 · 02-10-2014, 03:57 PM

Quote:

Originally Posted by jvoisel

I have:
Stock 3.8" front pulley
OD rear cog
XS Power 2" headers
ADM CAI
Made just over 10psi on the dyno and 550rwhp/565rwtq on a conservative tune

There we go! Great info. Thanks a lot. What was the temperature like when you dyno'd that setup and were just over 10 PSI? I wonder if putting the front UD Pulley would put it at 9 or would make it too low? I have just always heard anything over 10 PSI and you are pushing the limits on stock internals. That is why I would like to stay at 9 with the very max being 10 during those cold days when it likes to spike up a bit in PSI.

Ron_Robinson1 · 02-10-2014, 04:13 PM

Quote:

Originally Posted by JHall651

There we go! Great info. Thanks a lot. What was the temperature like when you dyno'd that setup and were just over 10 PSI? I wonder if putting the front UD Pulley would put it at 9 or would make it too low? I have just always heard anything over 10 PSI and you are pushing the limits on stock internals. That is why I would like to stay at 9 with the very max being 10 during those cold days when it likes to spike up a bit in PSI.

A lot depends on what your fuel system consist of injectors, fuel pump, and Octane 91/93?

There is a lot of people over 10lbs of boost ls3/L99. I don't think it's the boost number that kills a motor, but cylinder pressure (hp). And if you have supporting fuel mods, and a good tuner 10lbs should be fine.

old motorhead · 02-10-2014, 05:16 PM

If you don't have belt slip, you'll be well over 10psi with a 3.8 front pulley with overdriven rears. That's assuming stock cam and VERY open exhaust. If you have less with a similar setup, you probably have restrictions before the throttle body.

jvoisel · 02-10-2014, 05:23 PM

Quote:

Originally Posted by old motorhead

If you don't have belt slip, you'll be well over 10psi with a 3.8 front pulley with overdriven rears. That's assuming stock cam and VERY open exhaust. If you have less with a similar setup, you probably have restrictions before the throttle body.

I have stock cam, 2" headers, full 3" exhaust with the only mufflers being two short straight-through mufflers. I see over 10 psi but not too much over it or a normal day (70+deg) On a cold (under 40deg) night I have seen a hair over 11psi, but I have full confidence in my tuner and don't doubt one bit that it'll hold it. Cam/meth/12-13psi coming soon on stock bottom end.

Good tune is key.

JHall651 · 02-10-2014, 07:12 PM

Thanks so much everyone! Loving the input. Roger that on a good tune. I will be going to one of the most well known and best in the industry. I am just trying to do a bit of homework. I always lean towards the conservative side, especially considering for 70% of the year this is my daily driver. Does anyone know what a OD Cog and UD Pulley puts you at (PSI wise) w/ 2" headers and CAI?

jvoisel · 02-10-2014, 08:24 PM

Quote:

Originally Posted by JHall651

Thanks so much everyone! Loving the input. Roger that on a good tune. I will be going to one of the most well known and best in the industry. I am just trying to do a bit of homework. I always lean towards the conservative side, especially considering for 70% of the year this is my daily driver. Does anyone know what a OD Cog and UD Pulley puts you at (PSI wise) w/ 2" headers and CAI?

If OD cog makes 11 psi (max) and you add a 25% ud pulley, probably around 8.25 max. likely closer to 7-7.5

Have you talked to a tuner? IMO, you will have no issues running OD and stock crank pulley. Otherwise, just drop to a 3.6" up front. Cheaper to do that anyways

JHall651 · 02-10-2014, 08:53 PM

Quote:

Originally Posted by jvoisel

If OD cog makes 11 psi (max) and you add a 25% ud pulley, probably around 8.25 max. likely closer to 7-7.5

Have you talked to a tuner? IMO, you will have no issues running OD and stock crank pulley. Otherwise, just drop to a 3.6" up front. Cheaper to do that anyways

Thanks for the advice. I am seeing a common denominator in that most people (including my local tuner) are pretty confident that the OD Cog and stock pulley will be safe at just above 10 PSI. As far as going with the 3.6 up front I kind of have my heart set on the OD Cog, for the performance of course, but also the sound.

jvoisel · 02-10-2014, 08:56 PM

Quote:

Originally Posted by JHall651

Thanks for the advice. I am seeing a common denominator in that most people (including my local tuner) are pretty confident that the OD Cog and stock pulley will be safe at just above 10 PSI. As far as going with the 3.6 up front I kind of have my heart set on the OD Cog, for the performance of course, but also the sound.

Sounds is amazing haha.

Goodluck with the car Bud! Let us know what it makes.

02-09-2014, 11:17 PM	#1
JHall651 Drives: 2012 Camaro 2SS LS3 Ashen Grey Join Date: Mar 2012 Location: Chicago, IL Posts: 478	9 PSI w/ 2" Headers??? What would be the BEST / Reliable (not necessarily most cost effective) way to achieve a solid 9 psi with 2" headers using a Maggie 2300? (i.e. Rear OD/Front UD Combo?) __________________ 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

02-09-2014, 11:22 PM	#2
grocerygetter instigator Drives: 2020 6.2 Trail Boss, 2022 XC90 Join Date: Jan 2010 Location: 72034 Posts: 3,979 View My Garage	Proper pulley choice? __________________ -John S.

02-09-2014, 11:49 PM	#4
2SS45th Drives: 11 Seconds or Faster Join Date: May 2012 Location: Arvada, Colorado Posts: 2,797 View My Garage	Rear OD is the way to go. If you want to go past roughly 15 you'll need to go to a front overdrive kit as well. __________________ I Ain't About That Stock Life.

02-10-2014, 07:12 PM	#11
JHall651 Drives: 2012 Camaro 2SS LS3 Ashen Grey Join Date: Mar 2012 Location: Chicago, IL Posts: 478	9 PSI w/ 2" Headers??? Thanks so much everyone! Loving the input. Roger that on a good tune. I will be going to one of the most well known and best in the industry. I am just trying to do a bit of homework. I always lean towards the conservative side, especially considering for 70% of the year this is my daily driver. Does anyone know what a OD Cog and UD Pulley puts you at (PSI wise) w/ 2" headers and CAI? __________________ 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

02-10-2014, 05:16 PM	#9
old motorhead Drives: Maggie blown LS3 vette Join Date: Aug 2009 Location: SE TX Posts: 1,490	If you don't have belt slip, you'll be well over 10psi with a 3.8 front pulley with overdriven rears. That's assuming stock cam and VERY open exhaust. If you have less with a similar setup, you probably have restrictions before the throttle body.