M54. Let the foolishness begin.

[Jean]

In no time you'll develop your own ECU ;)

[SpecM]

Yay for you! that's so cool...

[CorvallisBMW]

:bow:

You, sir, are an inspiration!!!

[hoveringuy]

Love the O-silly scope!

I changed my software to average two cam signals and got the jitter out of the reading. It's rock steady at 250 degrees now.

That reading still seems kinda odd so I hooked the O-scope up to crank and cam signals simultaneously. The first picture clearly shows that the cam changes its state at right around 250 degrees of crank rotation. The cam wheel goes from the big part to small.

My LCD readout is dead on. Awesome!

The second picture shows why I was getting jitter when I read the pulses individually. The wheel isn't exactly in 180 sections. It's more like 174/184. At least that's how it's read. You can clearly see that one pulse is wider than the other. The LCD was constantly changing between 256 and 244 so that's why I couldn't read it.

Averaging is key otherwise the rapid changes would throw the Derivative part of my PID controller into chaos.

Also, VANOS retarded it reads 250. Advanced it reads 208. Do the math and you get 21 degrees of advance at the cam. Perfect!

[hoveringuy]

VANOS controller

I've been working on my standalone VANOS controller and have made some decent progress over the last several weeks.

My first milestone was getting the board to recognize TDC off the 60-2 wheel and blink an LED at TDC. That works great.

Then I got the LCD to display the RPM. Check.

Then I added the cam input and added some code to display the cam angle based on how many teeth have passed on the wheel. In doing that, I got some insight into why the cam signal wheel has 180 degree shapes on it. Since the cam spins at 1/2 speed of the crank, the cam sends a change in the signal once per crank revolution. Convenient!

Finally, I hooked the whole thing up to my car today and the car immediately stalled...

Connected a 1k Ohm resistor to keep the crank signal from being attenuated and now I can read the RPM and cam angle in real time off the (running!) engine.

However, I'm reading 240 degrees for the cam. It's jittering back and forth a few degrees so maybe they're not reading exactly 180 apart. I'll need to average between the two...

If someone has a motor on a stand I'd sure like to know when the cam wheel passes the sensor compared to the crank wheel.

Otherwise I'll configure the O-scope to read the Crank and Cam inputs simultaneously and I can figure it out that way.

[5mall5nail5]

Steve loving your circuit - so simple and concise. Good work on that!

[hoveringuy]

OBDI is 3.5 bar.

Do you have a vacuum reference connected to your FPR?

I have it set to 52psi which is 3.5 bar. (I thought it was 3.0bar) I have a vacuum reference line and I'll check it again tonight.

[matt]

OBDI is 3.5 bar.

Do you have a vacuum reference connected to your FPR?

[hoveringuy]

From what I've found they are 22lb, 235cc injectors, but I don't think it's an injector issue. It's possible that I have the fuel pressure too low, the e46 is supposed to be 3.5bar and I have it at a tad over 3.0 bar to match OBD1 specs. I don't know if the returnless fuel rail requires more pressure or the e46 injectors??

Hmmm... that's a good question. Do I need to have 3.5 bar for those injector's rated capacity or are they all measured at the same pressure???

I will reconnect my pressure gauge tomorrow, check the vacuum and probably boost the pressure by 5 lbs.

BTW, I installed the final version of my Hall to VR conversion circuit today. Works titties!

[2002maniac]

What size are the M54 injectors? Maybe you could move one step up there?

[matt]

Nevermind, I'll just reply to your email.

[SpecM]

I say more fuel pressure is in order
but the real culprit is the cam profiles, imo

[hoveringuy]

You're very lean, maybe dangerously so. Are you certain the wideband was calibrated properly? Could something else have thrown it off?

I think the wideband was accurate. It showed good richening at tip in and later he did some driveability checks and the A/F was more normal, although tending to lean.

I'm using the Dinan S50 chip. I don't know if the cam profile is causing it to go lean or the 8 extra degrees of VANOS advance. Fuel pressure is around 55 PSI. Should I bump up the pressure?

I think this was a good effort for a baseline pull. I need a better exhaust (the stuffing blew out after the first run. It was pretty funny!), I need to get my dual VANOS controller on track, and I need TRM to develop some pimpin' software for this. My goal is 220 wheel hp.

[325Projectz]

I learned in the process that the M50 power steering pump IS NOT compatible with the M54. The pulley ends up being offset by about 5/8". I need to order an M54 power steering pump ASAP.

have a picture of this?

i had a similar problem on my frankenstein s52 with a m54 oil filter housing. i had the m50 power steering pump bracket machined on the back side and now it works perfect. i also tried the m54 power steering pump, and i had more troubles with that. let me know if you a m54 pump.

[matt]

You're very lean, maybe dangerously so. Are you certain the wideband was calibrated properly? Could something else have thrown it off?