An easy way to be rid of those annoying 3Ltr limp mode issues forever.

[mudski]

Thought this would be good for all the 3ltr owners who have had a gut full of limp mode. I know I did back in the day. Plug and pray and just clip the voltage on the maf signals using this device and enjoy your new freedom of raising your boost levels without looking the limp mode issues. I don't know much about them, I just know plenty of people have used them. Other than making your own up from Jaycar, or using the HPD maf housing, which suits the Di'd only, this is another way to go.
http://www.14point7.com/products/ult...uel-controller

[Wilburnator]

Thought this would be good for all the 3ltr owners who have had a gut full of limp mode. I know I did back in the day. Plug and pray and just clip the voltage on the maf signals using this device and enjoy your new freedom of raising your boost levels without looking the limp mode issues. I don't know much about them, I just know plenty of people have used them. Other than making your own up from Jaycar, or using the HPD maf housing, which suits the Di'd only, this is another way to go.
http://www.14point7.com/products/ult...uel-controller

Just out of curiosity mudski, what sort of max boost levels would bring on the limp mode?


Sent from my iPhone using Tapatalk

[mudski]

It varies between vehicle but its usually around 16psi for the Di motors and maybe around 18psi for the CRD's.

[Wilburnator]

It varies between vehicle but its usually around 16psi for the Di motors and maybe around 18psi for the CRD's.

Is it a fairly quick response, as in hits the high boost and goes straight into limp? or does it have be in that range of boost for a given time?


Sent from my iPhone using Tapatalk

[Turtle_au]

Downloaded manual and had quick look. Aimed at petrol engines, uses ignition coil pulse for rpm input.

Sent from my SM-T355Y using Tapatalk

[mudski]

Is it a fairly quick response, as in hits the high boost and goes straight into limp? or does it have be in that range of boost for a given time?


Sent from my iPhone using Tapatalk

I can't remember exactly but I think its 2 second or so before it hits limp mode.

Downloaded manual and had quick look. Aimed at petrol engines, uses ignition coil pulse for rpm input.

Sent from my SM-T355Y using Tapatalk

There must be different models as I do know that this is being used for the Patrols. I'm crap when it comes to deciphering this electrical stuff. But I dont think they are using the rpm side of it. Just accessing the maf voltage signals.

https://cdn.shopify.com/s/files/1/01...anual.pdf?1955
http://www.14point7.com/pages/softwa...-documentation

[nissannewby]

They are also starting to do some nifty things with ecu remaps.

Be aware that at this point not all di ecus are able to be remapped.

[mudski]

Upon more searching around I see the boys on P4x4 have a thread about it...
http://www.patrol4x4.com/forum/nissa...thread-335202/

Interesting stuff.

[Turtle_au]

It has its own table that takes the MAF signal and rpm then from the table sends the new MAF signal to the ECU. If the aim is to limit the MAF voltage to stop it triggering limp mode, a simple zener diode on the MAF sensor line would do the same thing.

Sent from my SM-T355Y using Tapatalk

[mudski]

It has its own table that takes the MAF signal and rpm then from the table sends the new MAF signal to the ECU. If the aim is to limit the MAF voltage to stop it triggering limp mode, a simple zener diode on the MAF sensor line would do the same thing.

Sent from my SM-T355Y using Tapatalk

Yeah I spoke with a chap a few weeks ago who has done this. A simple inline resistor or diode, and his limp mode issues were gone. I'm no expert though, but the MAF is there to assist control of air fuel ratio's, so just adding a diode, I don't know how it would affect the AFR's across the rev range. Might be nothing, not sure...