projectcar

i added the turbo, and was running great, but three days later, i put the greddy blow off r/s on, and it seemed to be running a little slower (or maybe i got use to it) but... it's been back firing a real lot, and if im driving hard, then come to a stop, it stalls out....
i haven't got a chance to dyno it... but any comments or advice

slavearm

Yah... dont vent to air. Every time you vent to air, you send the MAF into I just got a bunch of air heaven and the ECU compensates by added a bunch of fuel. Use a recirculating BOV, or <Credit to MazdaManiac> clamp the output of the MAF when the TPS is at 0 </Credit to MazdaManiac>.

Fanman

Also try turning the BOV to soft. I had it set softer, and when I turned it to a harder setting, I started to see the stalling issue.

projectcar

fanman... they said i was runnin to soft, and letting to much air out, so madeit more harder.. aand since then it seems alittle better.

adrian-1

Yeah, it'll stall if your too soft.
Philodox had the same problem. He turned it harder. If you set it too hard it won't let any air out and it'll sound like you did without the BOV (turkey sound).

Fanman

I had the exact opposite problem. I was running OK, then made it harder & my unit was stalling my engine when I got off the throttle. I guess you just have to play with it a bit & find the right sound & function for your car.

youngpit

so no one realy knows hard or soft (and i dont mean that u sicko's) on the best setting for the BOV yet

Fanman

I guess it's trial & error. Had to adjust it a few times before I got the sound I liked & didn't stall all the time.

lurch519

must not vent to atmosphere with BOV on the 8. reason, we use a mass air sensor, or MAF. the reason is that the MAF measures the amount of air that is being sucked into the motor, and tells the ecu to supply the correct amount of fuel for that give amount of air. so when the BOV vents to atmosphere, the ecu still thinks that there is x amount of air that needs to be combined with fuel, making the engine run EXTREMELY rich when the BOV vents, and can cause stalling if too much fuel is present.

as stated in another post in this thread, use a recirculating BOV.