bstudey01

I just ordered a zeitronix map sensor and bung to see if I can get an accurate reading of my boost. I will be using my zt2 and dashdaq to display. Anybody know how to setup the Dashdaq to read the boost? Is there an equation that has to be put into the dashdaq? I have never set that up, right now I just use Manifold absolute pressure from obdii and subtract 14.5 in my head to see. I'm not sure if the reading I'm currently getting is accurate I see 27psi or 12.5psi subtracting atmospheric pressure. This seems to be very low with a 178 lower and 84 upper, considering most say stock boost is 11.5psi. I will find out shortly if it's not accurate or if it is I'm assuming I must have a boost leak, hopefully not.

blackbenzz

Boost is just a measure of restriction. Same car with same pulley but ported heads and headers would make more power but less boost

bstudey01

I realize that, but he is making 3psi more boost than me with same pulleys and exhaust and his heads are ported, mine are not. I have wondered why my boost is low for a long time now. I was actually low on coolant today, first time ever in almost two years. It was not much but I'm gonna have the system pressure tested just to be sure no bad head gasket. Coolant looks good, no white smoke, cant look at oil cause no dipstick, can I stick a hanger down there just to see if it looks milky?

kustom2k1

Bstudey, I get the same boost reading (12.5). I run a 168 with a smaller SC clutched pulley, MBH, no cats. You should make closer to 13.5lb with the 178 lower/SC pulley.

blackbenzz

Elevation and barometric pressure also play a factor in boost. I believe mercedes sells a dipstick for your car. Hopefully its not a bad head gasket, doesnt seem like it

Denroll

Click on one of the gauges on the DashDAQ screen. I find using a stylus for a Nintendo DS is good for the D-DAQ. Next, choose source (ZT-2) and then signal (MAP). That might get it displaying.

If that doesn't work, you might have to program your ZT-2 to pass the boost reading on to the DashDAQ. A true PITA because you need a computer with a serial port.

bstudey01

Kind of what I thought. Was going to try a WOT pull only logging MAP, some are saying the obdii is just too slow to get accurate number, but want to check out the head gasket first before doing so. I'll update what I find out.

kustom2k1

OBD is slow in relaying the information but, it will give an accurate reading, just not in real time.

Denroll

The Zeitronix sensor works great and changes instantly. You can also tap into the ECU wiring fairly easily to get real-time RPM and TPS%.

99lightning

any know what wire the tps is under the hood for zeitronix i usually just tap into rpm wire think that one is pink

MAN55LE

If you find out, post it up... I just ordered a zeitronix, and would like that info as well.