Some of you may, though most of you probably will not remember my build a while back. MS1 built inside a Mazda case, nice and stealth but plagued by a missfire and bad tach signal.
Eventually I gave up and went back to the stock ECU. One rainy weekend I decided to give it another go and build a 36-1 wheel system and whilst I was there I also totally rewired the MS using teflon coated aircraft wire that I swiped from work.
The trigger wheel was cut from 8mm steel plate and then welded to the inner ring of the harmonic balancer that is directly connected to the crank. I then turned it on my lathe to remove any runout . The interesting looking bracket bolts through the first 2 bolts on the left hand side of sump so the sensor is looking at the wheel from about 8 o'clock.
And the result is a nice looking waveform from the sensor yay!! I tried to capture the zero crossing but couldn't get the camera to do it :(
The car now runs smooth as silk with no missfires and I am a very happy man.....Untill I try to rev past 4.5 - 5k boom bang splutter buck clank ****.
I have a nice screen cap of the log showing my various problems.
The first little red box shows the RPM as it goes nuts at 5k and jumps around (this also manifests itself on the car tach as the needle jumping around). The second red box shows how sometimes when slowing on 0% throttle my MAP jumps from 0-100kpa!!??. And the third shows a small blip on the tach signal at around 3k but it can pull through this one.
I think that the tach signal is probably the result of wrongly adjusted resistors on the VR conditioner. ATM I'm running the MS base settings of both pots fully counter clockwise. Any suggestions?
The MAP signal baffles the hell out of me.
Any suggestions or advice on the above is greatly appreciated.