ca18det hit wall around 4k RPM - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

yiipi · 08-09-2013, 01:21 AM

Hi to you all. Have a problem with my ca18det for a while. When I go with no boost, gentle acceleration, I have problems after 4k rpm, might be around 3500 rpm to 4500 rpm. Engine go very lean, and hesitate to accelerate. When I hit a boost everything works well but a litle bit lean I think. I have stock engine with boost up to 1Bar and I have walbro 255lph fuel pump and aeromotive a1000-6 frp witch has 43psi on vacuum, so I think I have enough fuel for much much more power. Coils are ok and ignition is ok (checked with osciloscope). Might be that there is some problems in connectors but it would not b that because it hit's problem exactly in on part of the rpm scale. Another thing is that I have dead driver (darlinghton) in ECU for fuel pressure solenoid valve, and because of that I've bypassed that valve and put fpr directly to vacuum. Could that be a problem. As I know that valve works around 3min from engine start and has no function other than that or does he. Have no another ECU to test it. Any clue... thanks

Sc0oByDo0RaCeR · 08-13-2013, 06:48 AM

Check your wastegate.

g35gabby · 08-13-2013, 07:54 AM

Sounds like either a WG issue, or you have a boost leak.

ThatKidWithTheOnevia · 08-13-2013, 10:29 AM

Sounds like a boost leak

yiipi · 08-13-2013, 02:28 PM

[QUOTE=Sc0oByDo0RaCeR;5379589]Check your wastegate.

Wastegate is ok ...

do you think that AFR would b extra rich because I loose air after AFM?
ECU think that air goes in engine but due to leak never went ther. Also boost seems to be exactly where I set it to be no lower/higher. And I newer reach the boost cut (I know exactly what it's like)

Sc0oByDo0RaCeR · 09-14-2013, 01:52 PM

Does it still hit 4k and drop?

yiipi · 09-30-2013, 02:53 AM

Yes, Do not know what to do...

08-09-2013, 01:21 AM	#1
yiipi Join Date: Jun 2011 Location: Serbia Age: 44 Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	ca18det hit wall around 4k RPM Hi to you all. Have a problem with my ca18det for a while. When I go with no boost, gentle acceleration, I have problems after 4k rpm, might be around 3500 rpm to 4500 rpm. Engine go very lean, and hesitate to accelerate. When I hit a boost everything works well but a litle bit lean I think. I have stock engine with boost up to 1Bar and I have walbro 255lph fuel pump and aeromotive a1000-6 frp witch has 43psi on vacuum, so I think I have enough fuel for much much more power. Coils are ok and ignition is ok (checked with osciloscope). Might be that there is some problems in connectors but it would not b that because it hit's problem exactly in on part of the rpm scale. Another thing is that I have dead driver (darlinghton) in ECU for fuel pressure solenoid valve, and because of that I've bypassed that valve and put fpr directly to vacuum. Could that be a problem. As I know that valve works around 3min from engine start and has no function other than that or does he. Have no another ECU to test it. Any clue... thanks

08-13-2013, 07:54 AM	#3
g35gabby Nissanaholic! Join Date: May 2010 Location: lake mary, Fl Age: 34 Posts: 1,954 Trader Rating: (26) Feedback Score: 26 reviews	Sounds like either a WG issue, or you have a boost leak. __________________

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08-13-2013, 06:48 AM	#2
Sc0oByDo0RaCeR Leaky Injector Join Date: Jan 2011 Location: Lynn Age: 32 Posts: 89 Trader Rating: (1) Feedback Score: 1 reviews	Check your wastegate.

08-13-2013, 10:29 AM	#4
ThatKidWithTheOnevia Join Date: Aug 2013 Location: Las Vegas Age: 27 Posts: 24 Trader Rating: (0) Feedback Score: 0 reviews	Sounds like a boost leak

08-13-2013, 02:28 PM	#5
yiipi Join Date: Jun 2011 Location: Serbia Age: 44 Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	[QUOTE=Sc0oByDo0RaCeR;5379589]Check your wastegate. Wastegate is ok ... do you think that AFR would b extra rich because I loose air after AFM? ECU think that air goes in engine but due to leak never went ther. Also boost seems to be exactly where I set it to be no lower/higher. And I newer reach the boost cut (I know exactly what it's like)

09-14-2013, 01:52 PM	#6
Sc0oByDo0RaCeR Leaky Injector Join Date: Jan 2011 Location: Lynn Age: 32 Posts: 89 Trader Rating: (1) Feedback Score: 1 reviews	Does it still hit 4k and drop?

09-30-2013, 02:53 AM	#7
yiipi Join Date: Jun 2011 Location: Serbia Age: 44 Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	Yes, Do not know what to do...