rpm drop on throttle, won't rev past 3k

[concept_R]

Hi everyone,

I finally got to start my car (Datsun 240z Turbo, fully built engine, 440cc injectors, LS2 coil near plug, fully sequential)
Idles fine, but the engine stalls when I tap the throttle. I have to rev it up suuper slow and even then it won't rev past 3k.

I did a little research and came to the conclusion that it might be due to wrong dwell? and too little AE?

Thanks for your input!

[elutionsdesign]

It's idling over 85 KPa MAP so you have little to no manifold vacuum, typically you'd see 30-45 KPa at that rpm. I'd check your cam timing and ignition timing.

[concept_R]

Thank you! I checked timing and it seems correct (set it to fixed and got 10deg) However, I do get a Cam Fault error after a few seconds? Could this be an indicator? However, since the timing is good, I can't imagine the cause of that error. I checked with a scope and I do get a cam signal (also installed the pull-up resistor)

I will definitely investigate for vacuum leaks!

Oh and it's a MS III with MS3x V3.57

Thank you!

[billr]

Post another MSL that shows what happens when you slowly open the throttle to make it "rev up suuper slow". Also, I would turn off any AE for now.

[concept_R]

I figured the cam sync fault is some 'second trigger active at' setting, I found a thread with someone having the same problem with the same setup.

I attached another log which shows the slow accel.

Thank you!

edit: found another log with slow accel.

[elutionsdesign]

Sync loss is reason 2, missing tooth at wrong time.

[concept_R]

Thank you!
I emailed diy, since I followed their Nissan trigger disc install and still get this error?
Does anyone have an idea what could be causing the error?

[concept_R]

I did some tests today and found out that my MAP sensor is defective. I thoroughly checked it and it won't go lower that ~83kpa and no higher than ~110kpa no matter what pressure is applied.

Changing the 'Trigger active' setting from Poll Level to Rising Edge cleared the Cam Fault error.

Here are the data logs:
https://www.dropbox.com/sh/2skaw8qrydg5 ... N3-ba?dl=0

[concept_R]

Here is another log with the replacement MAP sensor. Found that the lower wastegate port was leaking, so I disconnected and plugged it. The upper port was still connected, so the wastegate was never opening hence the boost spikes.
rpm drop on quick throttle input and horrible >3k rpm performance remain.

[concept_R]

possible that the upper rev-limit is from using the wrong injector deadband/pwm settings, since I am running 440cc Supra injectors (low impedance, little over 3ohms) each connected to a 100W 3ohm resistor.

Pretty sure it's a different reason than the rpm drop which is very likely too little AE.

I added a crop of the prev. log so the high rpm cutoff is easier to spot.

Screenshot from 2017-07-17 19-32-06.png

[billr]

If your "reqfuel" is correct, then it looks like it is simply going way too rich.