8 Second 6spd
does anyone know the supra MKIV's MAF voltage output/range to the ecu? searched to no avail.
Yes, both the Z32 and MKIV turbos use hot-wire mass air sensors. The formula I posted was taken from readings from a voltmeter and corisponding readings from a OBD2 datalogger. I am 100% sure the curve is correct, although the overall scalling might be a little off. If you look at the equation you see it is far from linear.toypro said:Do the mkiv's use a hotwire maf meter? If so, I don't think you'll really be able to find that information unless someone had logged it on their own,and that would not be accurate either. If it uses a hotwire MAF, it bases the voltage output of the sensor on the amount of current needed to maintain a constant temp to the hot wire, don't know exactly how to explain it, but basicly has a wire kept at a certain temp, the more air that passes it,the more it cools and thus the more current it needs to maintain the required temp, the sensors output signal is determined by the current flow required to do that, not by the auctual volume of air passing through. Assuming you're talking about a turbo model. I don't have a mkiv, but I'm fairly certain they use a hotwire maf, if not sorry.
Grant said:Note that GM mass air sensors have a frequency output, but are still hot-wire type. Supposedly GM did this for better noise resistance.grant,
do you have any more details on the outputs (and inputs if any) of the mkiv maf and the GM mafs. a buddy of mine with a DSM says he can get a box that converts the output of the GM maf's to something the DSM ecu can use. it'd be nice if we could do the same. vpc's and aem's cost too much.