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Originally Posted by decypher
mjannusch Thankyou very much you summed that up very well so much so i understood it. Which is better 3.5 or 3.0. From what i understand from what you said i think the 3.0 is better for me because it reads in psi and not bars. Is that right?
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Well, it seems that most people prefer the AEM 3.5 bar because they feel that the accuracy is a bit better than the GM 3 bar sensor.
As far as psi vs. bar, it doesn't matter at all. The sensor just sends a variable voltage to the AEM. You tell the AEM whether you want to read pressure units as bar, psi, kg/cm^2 or whatever. All you really need to know is that the 3.5 bar sensor is good up to 35 psi of boost, and the 3 bar sensor is good to 30 psi. Either one should be enough for a 3/S unless you are going all-out on a large turbo setup, in which case the 3.5 will generally be sufficient. AEM also has a 5-bar MAP, if you are that kind of crazy.