Weyro Posted July 10, 2013 Share Posted July 10, 2013 Is it possible to replace the stock 2bar map sensor with a 3bar map sensor? The three wires on a map sensor, as far as im aware are: MAP signal, 5V reference, and sensor ground. So if you wired these up correctly it would work? Quote Link to post Share on other sites
daniel_g Posted July 10, 2013 Share Posted July 10, 2013 Lots of folk swap them out for the ST205 GT4 3bar one, i think its that one anyway, has a purple sticker on it. Thats when using management though, don't think the standard ECU would read it ?? Could be wrong but. Quote Link to post Share on other sites
Weyro Posted July 10, 2013 Author Share Posted July 10, 2013 since its just a 0-5v i rekon it would read it fine, but obviously instead of 4v meaning 0.8bar, it now means 1.6bar, so the ecu would fuel wrong Quote Link to post Share on other sites
daniel_g Posted July 10, 2013 Share Posted July 10, 2013 You could get around that with your fuel computer though ay ? Is it a celica one your gonna use ? Quote Link to post Share on other sites
Weyro Posted July 10, 2013 Author Share Posted July 10, 2013 (edited) yea the fuel computer would compensatei guess an adjustable fuel pressure regulator could compensate too, since an HKS FCD has a similar affect on voltage as upping the size of the sensorwell ive got a greddy one sitting in my room, was gonna try it Edited July 10, 2013 by Weyro Quote Link to post Share on other sites
daniel_g Posted July 10, 2013 Share Posted July 10, 2013 You cranking the boost up like ? Quote Link to post Share on other sites
Weyro Posted July 10, 2013 Author Share Posted July 10, 2013 thinking about going forged, but until i do im going to push the stock engine and ecu till it pops haha Quote Link to post Share on other sites
daniel_g Posted July 10, 2013 Share Posted July 10, 2013 Yeah, dont do that, i did that lol. Quote Link to post Share on other sites
AdamB Posted July 10, 2013 Share Posted July 10, 2013 The stock ecu won't be able to read it as it will be scaled differently. Will work with programmable management though. Quote Link to post Share on other sites
Weyro Posted July 10, 2013 Author Share Posted July 10, 2013 (edited) if its only 0-5v why cant the ecu read it?i thought it would be able to read the signal, just wont fuel correctly because the signal now represents a higher pressure Edited July 10, 2013 by Weyro Quote Link to post Share on other sites
AdamB Posted July 10, 2013 Share Posted July 10, 2013 All sensors are 0-5v. Quote Link to post Share on other sites
Weyro Posted July 10, 2013 Author Share Posted July 10, 2013 (edited) yea so if 4.15v means 0.85bar on our 2bar sensors, then 4.15v should mean around 1.77bar on a 3bar map sensor, but the ecu will only fuel enough for 0.85bar Edited July 10, 2013 by Weyro Quote Link to post Share on other sites
AdamB Posted July 10, 2013 Share Posted July 10, 2013 It scaled wrong like I said. Try it and find out Quote Link to post Share on other sites
daniel_g Posted July 10, 2013 Share Posted July 10, 2013 Sounds like a dare there Weyro. Do it or youre a pussy man haha. Quote Link to post Share on other sites
Weyro Posted July 10, 2013 Author Share Posted July 10, 2013 haha ill report back tomorrow with a blown engine then Quote Link to post Share on other sites
daniel_g Posted July 10, 2013 Share Posted July 10, 2013 Best club to be in bud. Fucked FTE club FTW !! Quote Link to post Share on other sites
AdamB Posted July 10, 2013 Share Posted July 10, 2013 lol am sure they are cheaper than the likes of a Greddy item so would save people money when upgrading to programmable management. Fucked FTE club, I'm in the bare shell engine in bits starlet club lol. Quote Link to post Share on other sites
TurboTobz Posted July 10, 2013 Share Posted July 10, 2013 Ya don't swap that my mate done it with a mr2 sensor he loved the power increase (running lean) he's a mechanic and didn't take the hint of it dropping plug tips and I also told him it won't be working right he got beat by a vts put it back on, beat the vts...Melted a piston, seized his engine etc etc Quote Link to post Share on other sites
Weyro Posted July 10, 2013 Author Share Posted July 10, 2013 ive got a wideband though, so i should be able to sort the fueling out how does it differ from using an HKS FCD? i thought both would have the same effect since they are changing the voltage by a percentage setting 8 on an HKS fcd moves fuel cut from 0.85bar to around 1.2running a 2.5bar sensor would move it to around 1.3 barand a 3bar sensor to 1.77bar Quote Link to post Share on other sites
H_D Posted July 10, 2013 Share Posted July 10, 2013 I purchased one of these map sensors off socks but no longer need it. It will b up for sale soon Quote Link to post Share on other sites
TurboTobz Posted July 11, 2013 Share Posted July 11, 2013 (edited) I don't think it quiet works how your thinking mate, Definately research it heavily, you may be right but I believe that your current ECU wont be able to read the map sensor because of the scaling of the ECU. If you were to use one yod need an ECU that is programmed to read that map sensor. I may well be wrong so don't take that as gospel, but I'd certainly not rush into it as it'll potentially become very expensive.Also, I wouldn't push your engine if your going to forge it, either you can sell yours for decent money which can help find the forged build or you can use your engine, and components to build the new engine. Edited July 11, 2013 by TurboTobz Quote Link to post Share on other sites
Weyro Posted July 11, 2013 Author Share Posted July 11, 2013 (edited) I thought by scaling it means that rather than 0-5v representing absolute 0-2bar it now represents absolute 0-3bar.Which works out at 0.36v per 0.16bar, which becomes 0.36v per 0.24bar. Edited July 11, 2013 by Weyro Quote Link to post Share on other sites
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