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Old 02-10-2014, 12:17 AM   #1
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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?)
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Old 02-10-2014, 12:22 AM   #2
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Proper pulley choice?
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Old 02-10-2014, 12:25 AM   #3
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Proper pulley choice?

Huh? Are you asking me?
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Old 02-10-2014, 12:49 AM   #4
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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.
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Old 02-10-2014, 04:19 PM   #5
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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.
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Old 02-10-2014, 04:29 PM   #6
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Originally Posted by JHall651 View Post
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
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Old 02-10-2014, 04:57 PM   #7
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9 PSI w/ 2" Headers???

Quote:
Originally Posted by jvoisel View Post
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.
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Old 02-10-2014, 05:13 PM   #8
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Quote:
Originally Posted by JHall651 View Post
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.
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Old 02-10-2014, 06:16 PM   #9
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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.
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Old 02-10-2014, 06:23 PM   #10
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Originally Posted by old motorhead View Post
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.
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Old 02-10-2014, 08:12 PM   #11
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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?
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Old 02-10-2014, 09:24 PM   #12
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Originally Posted by JHall651 View Post
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
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Old 02-10-2014, 09:53 PM   #13
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Originally Posted by jvoisel View Post
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.
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Old 02-10-2014, 09:56 PM   #14
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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.
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