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I forgot to add above that, with this type of boost controller, you must make sure the lever applies firmly on the limiting screw and not be "just at the limit" ( and therefore more than with a dawes...

Blocking EGR and adding a 3" exhaust is the perfect recipee to get limp, in that it reduces back pressure (3" exhaust) and increase MAF voltage ( both EGR blocked and 3" exhaust do that).

MAF...

I hardly ever come on this site these days, John.

For what I understand, this boost controller is equivalent to what I described elsewhere as a "two needles arrangement".
One being connected to...

On a 2001 Di, boost level has nothing to do with limp.
Limp only occurs when the MAF voltage
- exceeds 3.55V below 2000RPM
- exceeds 3.88V below 2500RPM
- exceeds 3.98V below 3000RPM
- exceeds...

Dawes + Needle is a disaster for the "breathing" of your Patrol down low.
The Dawes keeps the vanes of your VNT fully closed until you reach the opening boost it has been set to open at.
And when...

Making the ECU believe there is less air coming through by enlarging the inlet, or by simply adding one or two schottky diode in serie (costs only 10 cents each) with the MAF signal to reduce it by...

Unfortunately, what this device does is decrease the MAF voltage to make the ECM believe there is less air coming through.
As a result, the ECM requests less fuel to the pump, and you get less power...

This is a non-sense mate.
reducing the MAF voltage makes the ECM believe there is less air than real. So, the ECM requests less fuel to the pump.
Pushing boost, when reducing the MAF voltage,...

Don't get me wrong.
I am not saying you do not need to have more boost to get more air in.
But boost is not all. What you need is to maximize the quantity of air getting in your cylinder, as...

Boost is not what is needed by your engine.
Only airflow matters ( MAF voltage represents an estimate of the quantity of air pushed by the turbo inside admission and your cylinders.

It is a...

And the expected result speaks for itsel : plenty of air, controlled boost, plenty of torque down low.
Cherry on top of my cake: by reducing MAF voltage only when idling, fuel eco is improved by 30...

Reducing the MAF voltage suppresses limp, but also reduces power :

The quantity of fuel requested by the ECM to the pump is directly linked to the MAF voltage value.
The higher the MAF voltage,...

Hi mate,
If you have fitted a dawes and Needle Valve, and got read of the ECU control/ Solenoid, Limp mode can also be due to turbo pressure going a bit too high with the extra load/extra pressuve...

Hi Guys,

at last I can bring some interesting input to your fantastic forum, from which I learnt a lot.

I wan not happy with the setting of a Dawes + Needle, in lieu of ECU + electrovanne on my...

No, I no longer use the Solenoid.
I checked the install post, and all was set as explained.

With the original setting, I could get the pressure to go up nicely until 1.1 bar (16PSI), but I...

Error in my posted diagram.
This is the correct arrangement :
76229

Sorry. This is the correct arrangement.

7622876228

and there was a mistake in my diagram, sorry.
This is what I am about to do when I receive my second needle valve ( to smooth the flow coming from the dawes, and regulate the spped of opening of the...

Hi mate, thanks for your answer
Originally, I had this :
76226
With the needle set to establish the vacuum level as explained. But as soon as the Dawes was opening, I had a drop in pressure.
And...

I was not happy with the Dawes/Needle setting, although I got it to work.
For me, this arrangement is missing one level of freedom to make sure we get the best out of the VNT.
This is why I am...

not sure which thread to post to, but I was not satisfied with the original install of the Dawes and needle, as I found the trade-off between spool-up and max boost to get a continuous and nice boost...

nobody ?
I found a solution to get a progressive opening of the variable geometry by improving Chaz's schematic as follows :
Any comment welcome.

76219

I replaced my 2000 IC recently from stock, by a larger one, but I can ensure you I had absolutely no problem with it, and it was not leaking ( no oily/greasy ends). So I guess it sometimes happened...

hi mate,
Philippe from the other side of the planet (FRANCE).

When you play with the needle, from closed to opened, do you see the actuator arm moving from one end to the other ?

if you take...

Hi down under,

I am a french owner of a 05/2000 3.0Di Y61 PATROL (ZD30), with 160 000km, which I bought brand new... 18 years ago.
I did nothing on it until reaching 150 000km. No problem...