mikey4410 Posted July 9, 2014 Share Posted July 9, 2014 Just been reading a quote from somebody on toyotanation forum The guy was saying that you can just block of the vacuum to the map sensor to stop the ecu activating fuel cut ? He stated that all the map sensor does is solely JUST to activate the oem led turbo stages and also JUST register fuel cut levels. Is this true ?? And surely the car wouldnt even idle with the map vacuum blocked off ?? Quote Link to post Share on other sites
turbo Grant Posted July 9, 2014 Share Posted July 9, 2014 Lol, do how will the ecu do the loads side of fueling with no map sensor Quote Link to post Share on other sites
mikey4410 Posted July 9, 2014 Author Share Posted July 9, 2014 Well thats what I thought but then my sard rrfpr is vacuum operated and nowere near the map vacuum line.people are doing this mod and they recon its working Quote Link to post Share on other sites
morgey Posted July 9, 2014 Share Posted July 9, 2014 The old tvis corolla gti's had a vacuum switch like that that ran the eco light on the dash. I still find it hard to believe though Quote Link to post Share on other sites
mikey4410 Posted July 9, 2014 Author Share Posted July 9, 2014 You think how much a hks fcd corrupts the signal.to the point you have to turn up fueling a bar even on setting 11 on fcd.that just shows the map signals not doin much as if it did the fcd would never get away with what it does and how badly it does it Quote Link to post Share on other sites
richardc9052 Posted July 9, 2014 Share Posted July 9, 2014 the fcd only gets away with it because you compensate the ecu adjustments caused by the fcd sending out a lower signal by using an fpr to raise pressure.. without the map sensor there isnt and load sensor for the ecu to read so the it will follow the atmospheric pressure line on the map most likely to run lean. BUT.... try it and let us know what your findings are from the wideband. Quote Link to post Share on other sites
triple j Posted July 9, 2014 Share Posted July 9, 2014 The chap that said that has no clue, dont even try it. Quote Link to post Share on other sites
JayJ Posted July 9, 2014 Share Posted July 9, 2014 Ecu uses a lot of sensors to calculate the best possible afr and map sensor is one of those. It isn't there just for boost leds and fuel cut. Surely you can unplug it or use a diode to clamp the voltage and your engine will still run(probably in open loop), but it will also have effect to fuel economy, emissions and power. Quote Link to post Share on other sites
mikey4410 Posted July 9, 2014 Author Share Posted July 9, 2014 I just never seen anybody talk about it etc.needless to say I will not be trying it at all. Quote Link to post Share on other sites
karl. Posted July 9, 2014 Share Posted July 9, 2014 (edited) Maybe he is taking about cars that use a AFM instead of a MAP sensor to sense what load/boost conditions there currently is. While they may still have a MAP sensor to feed the dash lights etc but our cars do not have a AFM Edited July 9, 2014 by karl. Quote Link to post Share on other sites
5e colin Posted July 9, 2014 Share Posted July 9, 2014 ha ha go flat out with a blocked vac line it wont last long attal why do you tink turbo and na use diferent map sensors !!!!! Quote Link to post Share on other sites
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