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I have just fitted a JCW turbo to my N14 Cooper s, it seems to be dumpling boost when I go WOT. I'm sure I've read somewhere that I will need to fit a JCW map sensor but I can't find any posts again to confirm that. Dose any one have any experience with this? It has a Manic stage 1 map and is running fine when I put it back to standard. Also it is the older n14 without a MAF sensor and it has everything on it for a stage 2 if that makes any difference. Thanks.
 

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Would also like an answer to this, also have a N14 cooper s with a JCW turbo, bit I run a stage 2 manic map, running a or b about 23 psi , is ok but soon as I run c, about 24 psi I think. any hard driving drops into safe mode cos of overboost. Would the JCW 3bar sensors let me boost past the 1.5 bar boost limit from the standard 2.5bar sensor.
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Dervtech mentioned the following when I asked after seeing it mention on one of their tunes on Facebook

You will need a JCW MAP and TMAP sensor to ensure accurate boost control
 
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