MAP sensor enhancer for LJ78

[everbret]

Hi everyone,

Not sure if this has been covered yet, but I'll ask just in case.

I was reading this forum recently:

Toyota 4WD Surf Owners :: View topic - Fuel economy mod for $2

It is in regard to putting in a tap before the MAP sensor to prevent the LJ78 from overfuelling, as the sensors seem to have a tendency to fail after a while. I noticed that my green turbo light turns on at around 2 psi, which apparently is lower than the original sensor was intended to do. Therefore, I end up overfuelling, according to the above forum, for most of my around town driving.

I put in one of the taps that they are talking about, and it seems to work pretty good. However, it ends up pretty gutless when driving on the highway. That being said, with the sensor on, even on the highway, the green light is often on when I probably don't need it (~80kmph when cruising on an even grade).

They seem to have come up with some pretty clever modifications on the above forum, but they're a bit too complex for me.

So, I was wondering if one of these MAP sensor enhancers meant for the HHO systems would do the trick:

The Water4Gas Report: How to Install the MAP Sensor Enhancer

YouTube - How To Install Adjust a Map Enhancer For Hydrogen Generator

What does everyone think? I think by reducing the increase in voltage from the MAP sensor, this might prevent the overfuelling that the LJ78 is apparently infamous for.

Any thoughts?

Cheers

 

[pradocruzer]

I have been playing around with a similar concept. The concept i have been using has worked really well. For me losing a lot of power for fuel savings is not all that economical. Small engine, large truck, and no power dosn't work for me if all I see is savings at the pump. The way mine is set up I have increased fuel econmy by 50-100 km's per tank (depending on my driving style) and I have dropped my egt's 100-150 degrees f on flat and hills. This system is also extremely adjustable to suit my needs. People seem to think that by upping the boost on the 2lte they are truley only adding boost not extra fuel. This is not the case with the computer controlled system of the 2lte. There is a small write up I did showing how to build a system like mine.
https://forum.ih8mud.com/70-series-tech/389684-reducing-2lte-egts.html

 

[everbret]

Hi there,

I've been trying to find this thread again for a while. I actually did this on my LJ78 and it worked great. It creates a variable resistor across the circuit coming from the sensor to the ECU. Thus, you move the curve to the right on the graph of boost (x axis) to fuel injection (y axis). Basically, I make it so the "boost" comes on at roughly 6 ppi. This seems to be the sweet spot between still having power, and decreasing the extra fuel dump that used to happen starting at 2 ppi. If anyone is still interested, I think I'll put some pics up.

 

[pradocruzer]

I'am interested. Please post some pics and info. Most of the 2lte owners have left this site. You will get a way better response on other forums. A write up and pictures would be great thanks.

Take Care.

 

[GTSSportCoupe]

I'm also very interested, as I will be doing this soon my Prado as well.

Pradocruzer: Thanks for all your contributions to the forum here. I have been reading a lot about the work you've done to your Prado, and will be doing much the same to mine.