Speedtoys

Has anyone ever worked out the function that Bosch put in place here?

SteveG

pounds per minute?????

Speedtoys

Or grams/sec..either result is fine.

John Speake

Here's the Bosch data sheet...

The Forgotten On

^^ All the important data you'll need is on page 3 of that sheet. It gives you the voltage ranges for the kg/h.

It'll be easy to figure out and program a readout (possibly) from there.

Speedtoys

Ya..Im struggling with this..5v is a moving 480 Kg/hr = 17.6 lb/min? 175HP? (ish)

hans14914

From my old files... I sent a MAF out to bench mark it to the Hitatchi insert in a 95mm housing. Tracked pretty well with a voltage offset.

In my notes, the stock MAF started showing some instability around 6.3v @ 1535kg/h

Incase that helps your efforts.

Speedtoys

You have that raw data still?

jcorenman

Jeff, I am confused-- where does 5v come in? The MAF is spec'ed to 930 kg/h = 5.7 volts, it will go higher but the LH max's out at 6.3v-- which is around 500hp (crank) I think.
ST's MAF-voltage display (and log) only goes to 5.1v but the calculated load signal ("MAF-signal (abs)") tracks higher.

dr bob

Jim --

Considering the abundance of cars that use the newer (read: lower $$) MAF sensors these days, is there a practical way to substitute one for the hot-wire sensors we use now? Seems from the plots that Hans shared that one could either build a little hardware op-amp "converter" to add the voltage offset, or change some of the code in the LH to rescale for the lower signal voltage.

Thoughts?