04-15-2012, 10:43 PM
Join Date: Oct 2008
Location: Cortland, Ohio
Total Cats: 0
First Drive With MS3, Tune/Turbo Trouble
Went for the first drive under the MegaSquirt III. I was going to do this a few weeks ago, but it would die every time I hit the throttle. I solved this by raising the RPM via the idle adjustment (blowthrough?) screw, bringing it up from 700 to 950rpm. That solved the crankyness and the stumble at sudden acceleration.
It drove ok, but I seem to get an occasional misfire. It only happens at low rpm, it seems, and once in a while. I did not see anything on the logs, so did not change any settings. I then plugged in the last piece of the turbo plumbing, and gingerly started it. Nothing different. Runs pretty much the same, but no noticable boost.
I attached my log from a short run, with two few-second stomps on the pedal. I also attached my current setup.
I'm pretty much at the limit of my understanding on this. My dad is better than I am on this, but neither of us have much knowledge about turbocharging. I understand the basics, but do not know what I need to modify/adjust with the MS3.
Also, I have the wastegate plumbed to the EBC, then to the intake manifold. I have a hunch that's why I was not passing 0.8psi, and constantly showing vacuum. I need to install a fitting before the intercooler once I can find one. The BOV is also plumbed directly to the intake manifold behind the TB, but that should be fine.
Any ideas here?
BTW, information on the build is in the build subforum somewhere.
1996 BP05 on a 1994 harness, MS3 with EBC, 38" equal length primary turbo manifold, SR20DET intercooler and BOV, 305cc injectors (yes, I know, I know).