So, I thought a stroker motor would be cool...
Bimmerheads engine (used w/6K miles):
And it is, but it is not running well on the stock ECU.
Rich at idle, lean under load, and cuts out at 3900 RPM @ WOT.
So, I got Ostrich 2.0 and TunerPro RT. (How hard could it be? 4 or five inputs: Temp, AFM, CPS, O2, TPS and a few outputs: Injector pulse, Timing.)
Oops. What are all those variables? How are they related? And what do they do?
I have 7 tabs open at https://www.thirdgen.org/...
I got the .bin and .xdf files.
Got the USB driver installed to talk to the Ostrich 2.0.
Seems like a recommended starting point is to set the "Injector Constant" since I have the M50 injectors instead of stock.
0-280-150-715 Stock M20 325i flow rating is 14.5 pounds / 152.5 cc/min at 3.0bar/43.5ps
M50 injector is 0280150415 180 cc/min at 43.7psi (3 bar)
The "Injector Constant" is set to 10, so
152.5 / 180 = 10 / X
I set "Injector Constant" to 11.8 (The TunerPro rounded it up to 12 for me.)
While I was there, I set "Rev Limit (primary)" from 6250 to 3250. It rounded it up to 3578 for me.
I loaded the .bin into the Ostrich 2.0, setup the exhaust gas analyzer and went for a drive.
Previously, idle was rich, and under load would be lean.
Cruising on the freeway had AFR @ 14.5.
Idle is no longer rich. It still goes lean under load. And cruising on the freeway AFR@ 14.9 - 15.5.
And the rev limit does kick in at ~3500 RPM.
It appears I was able to edit the .bin file and change the way the engine runs.
Initially it seemed counter intuitive that scaling the injectors to larger flow would lean it out, but after thinking about it, the computer would shorten the injector pulse for the larger injectors, so less fuel.
I have not figured out how to get data out of TunerPro RT. It seems I should have a .adx file, but I have not been able to find one for 173 computer.
Does anyone have one they would share / sell? Or advice on how to log the data and review it.
Also, any advice on what to look at next to modify would be a huge help.
Bimmerheads engine (used w/6K miles):
2.9 Mahle motorsport stroker |
10:1 Compression ratio |
M52 Crank ( 84mm stroke) |
85mm Bore |
Super sport head with performance valve springs and 274 cam |
S50 Connecting rods |
ARP Rod bolts |
ARP Main studs |
ARP Head studs |
Nuke adjustable cam gear |
And it is, but it is not running well on the stock ECU.
Rich at idle, lean under load, and cuts out at 3900 RPM @ WOT.
So, I got Ostrich 2.0 and TunerPro RT. (How hard could it be? 4 or five inputs: Temp, AFM, CPS, O2, TPS and a few outputs: Injector pulse, Timing.)
Oops. What are all those variables? How are they related? And what do they do?
I have 7 tabs open at https://www.thirdgen.org/...
I got the .bin and .xdf files.
Got the USB driver installed to talk to the Ostrich 2.0.
Seems like a recommended starting point is to set the "Injector Constant" since I have the M50 injectors instead of stock.
0-280-150-715 Stock M20 325i flow rating is 14.5 pounds / 152.5 cc/min at 3.0bar/43.5ps
M50 injector is 0280150415 180 cc/min at 43.7psi (3 bar)
The "Injector Constant" is set to 10, so
152.5 / 180 = 10 / X
I set "Injector Constant" to 11.8 (The TunerPro rounded it up to 12 for me.)
While I was there, I set "Rev Limit (primary)" from 6250 to 3250. It rounded it up to 3578 for me.
I loaded the .bin into the Ostrich 2.0, setup the exhaust gas analyzer and went for a drive.
Previously, idle was rich, and under load would be lean.
Cruising on the freeway had AFR @ 14.5.
Idle is no longer rich. It still goes lean under load. And cruising on the freeway AFR@ 14.9 - 15.5.
And the rev limit does kick in at ~3500 RPM.
It appears I was able to edit the .bin file and change the way the engine runs.
Initially it seemed counter intuitive that scaling the injectors to larger flow would lean it out, but after thinking about it, the computer would shorten the injector pulse for the larger injectors, so less fuel.
I have not figured out how to get data out of TunerPro RT. It seems I should have a .adx file, but I have not been able to find one for 173 computer.
Does anyone have one they would share / sell? Or advice on how to log the data and review it.
Also, any advice on what to look at next to modify would be a huge help.
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