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Best MAP to use for 20 psi

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Old Apr 17, 2015 | 09:44 PM
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Default Best MAP to use for 20 psi

I have a gen 3 4.8 and a gt45 turbo and I may run as high as 20 psi for boost on e85. I know there are some gm MAPs that are 2.5 or 3 bar. I would like to hear from some people about what MAP they use and your experience. I would like to know, part#, did it come with appropriate info for whatever tables I have to alter in efi live for it to be accurate, is it a direct fit on an LS6 manifold, how much did it cost? Thanks in advance! One other concern I have is that I have a factory t56 with about 100k on it. It still shifts perfect and has no problems. I know a t56 isn't usually the week link but could I be ok since I'm using 17 inch DRs and a "750" ftlb rated centerforce clutch? If I put 275 60 15s on the back is it a matter of if or when?
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Old Apr 18, 2015 | 01:24 AM
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I use the dpecorvettes 2.5 bar sensor, not the cheapest , but works very well. Great resolution and easy to tune.
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Old Apr 18, 2015 | 08:17 AM
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3 bar from efi source. 35$ and proven to work.
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Old Apr 18, 2015 | 11:05 PM
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Does the efi source MAP come with voltage offset table info? I don't need issues like I had with my SD80 injectors. I still don't know if I have the right data for 58 psi fuel pressure.
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Old Apr 19, 2015 | 08:05 AM
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A lot are using the ZR1 map sensor including myself with great results.
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Old Apr 19, 2015 | 01:58 PM
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Originally Posted by Shoaf85
A lot are using the ZR1 map sensor including myself with great results.
im looking for a direct fit one will the zr1 fit on my ls1 block ?
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Old Apr 19, 2015 | 02:46 PM
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Originally Posted by greasess
Does the efi source MAP come with voltage offset table info? I don't need issues like I had with my SD80 injectors. I still don't know if I have the right data for 58 psi fuel pressure.
Yup, it's posted on their website
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Old Apr 19, 2015 | 04:11 PM
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Originally Posted by mightybird
im looking for a direct fit one will the zr1 fit on my ls1 block ?
Gotcha! No unfortunately the ZR1 sensor is only direct fit for ls3/7 style int manifolds. You would need to remote mount it and run a vacuum line to it.
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Old Apr 19, 2015 | 04:24 PM
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Originally Posted by Shoaf85
Gotcha! No unfortunately the ZR1 sensor is only direct fit for ls3/7 style int manifolds. You would need to remote mount it and run a vacuum line to it.
thanks for the heads up ! who does make a drop in map this will work for 20+ lbs of boost ?
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Old Apr 19, 2015 | 06:58 PM
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Originally Posted by mightybird
thanks for the heads up ! who does make a drop in map this will work for 20+ lbs of boost ?
lol, as already stated... EFI source ls1 style 3 bar map. It's a plug and play. It will support 3 bar tuning which is ~ 28psi
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Old Apr 19, 2015 | 10:33 PM
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Originally Posted by JustAFooL
lol, as already stated... EFI source ls1 style 3 bar map. It's a plug and play. It will support 3 bar tuning which is ~ 28psi
my bad lol thanks ! its on its way !!
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Old Jan 22, 2018 | 02:36 PM
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Originally Posted by JustAFooL
3 bar from efi source. 35$ and proven to work.
I have to chime in on this one, Ive had 2 out of 3 defective bought new. I do not recommend anything other then GM now.
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Old Jan 22, 2018 | 06:49 PM
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Originally Posted by 01ssreda4
I have to chime in on this one, Ive had 2 out of 3 defective bought new. I do not recommend anything other then GM now.
what was wrong with them?
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Old Jan 23, 2018 | 12:50 AM
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Zr1 map on both my cars, oem quality, cheap. Win win
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Old Jan 23, 2018 | 08:48 AM
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Originally Posted by truckdoug
what was wrong with them?
First one was very limited in its reading, would span like 50-70kpa and thats it. Replaced it and now the new one is acting goofy (VE corrections werent being predictable) then it maxed at 105kpa in boost, so no positive pressure reading. Frustrating as hell. Swapping to ZR1 map sensors.
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Old Jan 23, 2018 | 09:14 AM
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Word, that sucks.

Anyone here using the newer Bosch map/iat combo sensor? Seems kinda nifty.
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Old Jan 23, 2018 | 06:21 PM
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Originally Posted by truckdoug
what was wrong with them?

China.
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Old Jan 23, 2018 | 06:26 PM
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Holley....Made in China for Holley
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Old Jan 23, 2018 | 07:02 PM
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lol its always china. some american company orders a copy of a part to sell to some other americans and somehow it's fault of an entire nation.

i blame o̶b̶a̶m̶a̶ trump
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Old Jan 23, 2018 | 09:53 PM
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I used the eBay $35 3 bar sensor and the first one lost contact inside the sensor and just died on street. I emailed em and they replaced it for free and it lasted two years and now on my last race it died as soon as it hit 14 psi, started it back up and tried racing again same thing. So I swapped to the duramax 3.3 bar map. Works great so far
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