RB neo timing ignition is driving me CRAZY!!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

MR_GUTTI · 01-05-2017, 05:11 PM

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:

Juantwo3 · 01-05-2017, 09:42 PM

Is the plate on the cas on backwards?

MR_GUTTI · 01-07-2017, 06:36 PM

Quote:

Originally Posted by Juantwo3

Is the plate on the cas on backwards?

Can you please explaining further. Thanks!

Juantwo3 · 01-07-2017, 10:02 PM

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

MR_GUTTI · 02-08-2017, 06:16 PM

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.

MR_GUTTI · 02-08-2017, 06:19 PM

Help please!!!!!!!

240sxfriendly · 02-11-2017, 06:05 PM

had a issue like this, turned out to be the knock sensor harness. worth taking a look.

Juantwo3 · 02-12-2017, 12:18 PM

Did it woirk ou for you?

MR_GUTTI · 02-15-2017, 01:12 PM

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!

MR_GUTTI · 02-15-2017, 01:14 PM

I just test the VVT solenoid and is opening and closing with 12v

MR_GUTTI · 02-15-2017, 01:19 PM

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?

MR_GUTTI · 02-19-2017, 09:36 AM

Does anyone has a r34 gtt ecu for sale?

01-05-2017, 05:11 PM	#1
MR_GUTTI Zilvia Junkie Join Date: Nov 2009 Location: Houston Posts: 324 Trader Rating: (9) Feedback Score: 9 reviews	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:

01-05-2017, 09:42 PM	#2
Juantwo3 Zilvia FREAK! Join Date: Sep 2011 Location: DTFullerton Age: 30 Posts: 1,101 Trader Rating: (20) Feedback Score: 20 reviews	Is the plate on the cas on backwards? __________________ GO DUCKS!!!!!!!!!

01-07-2017, 10:02 PM	#4
Juantwo3 Zilvia FREAK! Join Date: Sep 2011 Location: DTFullerton Age: 30 Posts: 1,101 Trader Rating: (20) Feedback Score: 20 reviews	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 __________________ GO DUCKS!!!!!!!!!

02-12-2017, 12:18 PM	#8
Juantwo3 Zilvia FREAK! Join Date: Sep 2011 Location: DTFullerton Age: 30 Posts: 1,101 Trader Rating: (20) Feedback Score: 20 reviews	Did it woirk ou for you? __________________ GO DUCKS!!!!!!!!!

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02-08-2017, 06:16 PM	#5
MR_GUTTI Zilvia Junkie Join Date: Nov 2009 Location: Houston Posts: 324 Trader Rating: (9) Feedback Score: 9 reviews	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.

02-08-2017, 06:19 PM	#6
MR_GUTTI Zilvia Junkie Join Date: Nov 2009 Location: Houston Posts: 324 Trader Rating: (9) Feedback Score: 9 reviews	Help please!!!!!!!

02-11-2017, 06:05 PM	#7
240sxfriendly Join Date: Jan 2014 Location: ontario Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	had a issue like this, turned out to be the knock sensor harness. worth taking a look.

02-15-2017, 01:12 PM	#9
MR_GUTTI Zilvia Junkie Join Date: Nov 2009 Location: Houston Posts: 324 Trader Rating: (9) Feedback Score: 9 reviews	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!

02-15-2017, 01:14 PM	#10
MR_GUTTI Zilvia Junkie Join Date: Nov 2009 Location: Houston Posts: 324 Trader Rating: (9) Feedback Score: 9 reviews	I just test the VVT solenoid and is opening and closing with 12v

02-15-2017, 01:19 PM	#11
MR_GUTTI Zilvia Junkie Join Date: Nov 2009 Location: Houston Posts: 324 Trader Rating: (9) Feedback Score: 9 reviews	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?

02-19-2017, 09:36 AM	#12
MR_GUTTI Zilvia Junkie Join Date: Nov 2009 Location: Houston Posts: 324 Trader Rating: (9) Feedback Score: 9 reviews	Does anyone has a r34 gtt ecu for sale?