Patrick Posted May 22, 2013 Report Share Posted May 22, 2013 I am just wondering what sort of variance should you be getting with the map sensor at atmospheric. I am running bosch STYLE 3 bar map sensor, i get any where from 99kpa - 108kpa, it drifts around a bit i think engine bay temperature has an effect on this. I understand the BAP has an effect on this but its usually just +1kpa in most cases. Also each time i check it's in my garage so sea level should have no effect on the variance. As I'm getting my car back on the dyno in a few weeks i thought it might be a good idea to get a genuine bosch sensor unless it is actually normal for the sensor to drift around this much. Cheers Pat Quote Link to comment Share on other sites More sharing options...
Simon Posted May 23, 2013 Report Share Posted May 23, 2013 You will see some movement based on the weather, If there is a high pressure system then the baro / map will be up and a low pressure day will give low readings. The main thing is the MGP reading with engine not running should be 0. Quote Link to comment Share on other sites More sharing options...
Patrick Posted May 23, 2013 Author Report Share Posted May 23, 2013 I double checked and there's a fair bit of variance, MGP is any where between -8 to +8 when cold/hot. At operating temperature it sits close to 0 with engine off (+/-3). Quote Link to comment Share on other sites More sharing options...
Patrick Posted May 23, 2013 Author Report Share Posted May 23, 2013 sorry forgot to mention units is in kpa Quote Link to comment Share on other sites More sharing options...
Simon Posted May 28, 2013 Report Share Posted May 28, 2013 That's not so good as that difference will have an effect on the tune. Check the power and grounds for the sensor. As if theses are suspect it will cause the readings to change. Quote Link to comment Share on other sites More sharing options...
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