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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , and Lx series.


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Old 01-05-2017, 06:11 PM   #1
MR_GUTTI
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RB neo timing ignition is driving me CRAZY!!!

Im finishing my RB25det NEO and I'm stuck trying to set up the ignition timing. First the mods.

Freddy plenum
Fmic
Stock turbo
Stock Maf
Iacv
Boost solenoid
Stock throttle body
Walbro fuel pump
Fuel regulator set to 36psi idle 42psi wot
Stock injectors
Wiring specialist harness

I already test the tps,cas, Maf, temp sensor and everything is ok. I double checked the mechanical timing and is onpoint.
So I let the engine warm up (idle around 700rpm) turn it off, I disconnect the tps, start again rpms jump to 900 at idle. With my timing light connected and moving my cas I can retard it all the way (counterclockwise) and get 25*. I can't reach the 15*.
The vacuum is almost 20 inhg at idle so I believe I don't have a leak, my fuel ratio is at 14.7
On my Nissan data scan show 5* timing. If I try to rev the engine fast it bogs and if I do it slow is ok. On my data scan I can run the base idle adjustments setting which automatically set the timing to 15* and revs perfect. After that the timing goes back to 5*.
Any help will be appreciated
Thanks!!

Timing marks:







Setup:

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Old 01-05-2017, 10:42 PM   #2
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Is the plate on the cas on backwards?
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Old 01-07-2017, 07:36 PM   #3
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Quote:
Originally Posted by Juantwo3 View Post
Is the plate on the cas on backwards?
Can you please explaining further. Thanks!
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Old 01-07-2017, 11:02 PM   #4
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If you take the cas cover off it has that disc looking thing with slots on it, it has like a half moon shape slot it can be put on backwards accidently
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Old 02-08-2017, 07:16 PM   #5
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Updated!!! I was able to set the cas to 15* but the Ecu keep making adjustments all the way to 5*. I'd try connecting the neutral sensor to the ecu but I was worse. I tested the knock sensors and are ok.
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Old 02-08-2017, 07:19 PM   #6
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Help please!!!!!!!
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Old 02-11-2017, 07:05 PM   #7
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had a issue like this, turned out to be the knock sensor harness. worth taking a look.
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Old 02-12-2017, 01:18 PM   #8
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Did it woirk ou for you?
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Old 02-15-2017, 02:12 PM   #9
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I already check the cas and is property install, also I check the wiring for the knock sensor and is fine as well.
Thanks for the help guys!! Keep the ideas coming please!
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Old 02-15-2017, 02:14 PM   #10
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I just test the VVT solenoid and is opening and closing with 12v
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Old 02-15-2017, 02:19 PM   #11
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It have to be a sensor or the ecu itself that is messing me up. When I use my consult (datascan) and run the base Idle it runs perfect!!!! Can a bad iacv mess my timing?
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Old 02-19-2017, 10:36 AM   #12
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Does anyone has a r34 gtt ecu for sale?
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