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MAP Sensor Question

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Old Jan 21, 2013 | 02:56 PM
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I am going to be replacing a few seals in my forged ls6 due to the crankcase pressurizing. Ill be adding a RX Monster catch can to alleviate that problem. While im in there I will be replacing my monster clutch with a Mcleod RXT that Doug(ECS) hooked me up with, adding meth, and pulleying down to a 3.4 from a 3.8. I will also be upgrading the diff with hardened shafts and a brace. My question is, will I have to get a 3 bar map sensor since the 3.8 pulley made 12psi with my setup? If I have to get another sensor, could someone point me in the right direction on how to change it? If you need any other info, let me know. TIA

Greg
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Old Jan 22, 2013 | 04:57 PM
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I guess my question is, can the car be tuned above 14 psi with a stock map sensor?
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Old Jan 22, 2013 | 05:23 PM
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Originally Posted by SuperSteve04Z
I guess my question is, can the car be tuned above 14 psi with a stock map sensor?
Doug tuned my car and when I went to SD tune, I needed to get a 2 bar, Doug brought it with him, I think it is a Cobalt sensor? I am at 14lbs if that help you out! I would just shoot Doug a PM and ask him which one to use to be sure! I just got a ZR1 map for my new motor per Dougs recommendation!
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Old Jan 22, 2013 | 05:33 PM
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Originally Posted by SuperSteve04Z
I guess my question is, can the car be tuned above 14 psi with a stock map sensor?
Are you currently SD tuned with a 2 bar sensor? You state stock sensor which is confusing.
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Old Jan 22, 2013 | 06:50 PM
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Originally Posted by SuperSteve04Z
I guess my question is, can the car be tuned above 14 psi with a stock map sensor?
You should upgrade to the 2bar sensor and 2 bar custom OS.

In the 2 bar OS the kPa limit is 210 kPa if I recall corectly. Please refer to link posted below to determine boost PSI to kPa conversion.


http://forums.corvetteforum.com/c5-f...reference.html
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Old Jan 24, 2013 | 02:40 PM
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Im an idiot. I thought that I would have to get a 2 bar map sensor and change the OS if going above 14 psi while still using a maf tune. I am not going SD, so i guess my question is not relevant.
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Old Jan 24, 2013 | 03:26 PM
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Originally Posted by SuperSteve04Z
Im an idiot. I thought that I would have to get a 2 bar map sensor and change the OS if going above 14 psi while still using a maf tune. I am not going SD, so i guess my question is not relevant.
I've run 14 psi on a stock OS MAF tune. You just have to use the PE table for fueling. It's definitely not ideal and very old-school, but it can be done. 2-Bar SD on a custom OS is the way to go in order to get your fueling accurate.

You can also run more the 15 psi on a 2-Bar map. The custom OS allows you to control your VE tables at various kpa's. On a centrifugal blower car, you can add in some extra fueling at the top of the 2-bar sensor range and get away with a few extra lbs. of boost.

Last edited by Neil B; Jan 24, 2013 at 03:33 PM.
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